המחברים בתודה להכיר תמיכה כספית מScotts Miracle-Gro החברה למתקן זה. אנחנו גם מעריכים לושות טורו לקבלת סיוע במתן בקר ההשקיה. החזון והתכנון על ידי ד&quot;ר כריס Steigler מאוחר בשלבים המוקדמים של הפרויקט הזה השלבים הוא גם הודה בהכרת תודה. המחברים גם מבקשים להודות לגב &#39;נ&#39; סטנלי לקבלת הסיוע הטכני שלה עם הכנת מדגם וניתוח.

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W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Determination+of+phosphorus+by+semi+automated+colorimetry.+Environmental+monitoring+systems+laboratory,+Office+of+research+and+development.">Determination of phosphorus by semi automated colorimetry. Environmental monitoring systems laboratory, Office of research and development.</a> U.S. Environmental Protection Agency. , (1993).</li><li>O'Dell, J. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Determination+of+nitrate+nitrogen+by+semi+automated+colorimetry.+Revision+2.0+Edited+by+JW+O'Dell,+Environmental+monitoring+systems+laboratory.">Determination of nitrate nitrogen by semi automated colorimetry. Revision 2.0 Edited by JW O'Dell, Environmental monitoring systems laboratory.</a> Office of research and development, U.S. Environmental Protection Agency. , (1993).</li><li>O'Dell, J. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Determination+of+ammonia+nitrogen+by+semi+automated+colorimetry.+Revision+2.0+Edited+by+JW+O'Dell,+Environmental+monitoring+systems+laboratory.">Determination of ammonia nitrogen by semi automated colorimetry. Revision 2.0 Edited by JW O'Dell, Environmental monitoring systems laboratory.</a> Office of research and development, U.S. Environmental Protection Agency. , (1993).</li><li>Gobel, P., Dierkes, C., Coldewey, W. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Storm+water+runoff+concentration+matrix+for+urban+areas.">Storm water runoff concentration matrix for urban areas.</a> J. Contam. Hydrol. 91, 26-42 (2007).</li><li>Vietor, D. M., Provin, T. L., White, R. H., Munster, C. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Runoff+losses+of+phosphorus+and+nitrogen+imported+in+sod+or+composted+manure+for+turf+establishment.">Runoff losses of phosphorus and nitrogen imported in sod or composted manure for turf establishment.</a> J. Env. Qual. 33, 358-366 (2004).</li></ol>

פרט לס קלי להיות עובד של Scotts Miracle-Gro החברה, המחברים מצהירים שאין להם אינטרסים כלכליים מתחרים.

מים זורמים על פני, ל, ודרך קרקעות מושפעות במידה רבה על ידי הטופוגרפיה, הכיסוי וגטטיבי, ותכונות פיסיקליות האדמה. קרקעות מוגזמת דחוסים וקרקעות עם תוכן חימר גבוה יציגו שיעורי חדירה מופחתים וכמויות מוגברות של מי נגר. לכן, בעת בניית מתקן מסוג זה, יש לעשות כל מאמץ שנעשה לשימ?...

ארבעת המטרופולינים, המאוכלסים ביותר צומחים במהירות הרבה ביותר נמצאים בדרום ארה&quot;ב באקלים סוב טרופי 1. בנוסף, אחוז השינוי הגדול ביותר בארץ עירונית בין 1982 ו -1997 התרחש בדרום ארה&quot;ב 1. עם אזורים עירוניים הגדילו מגיע ביקוש במקביל למים מתוקים, הרבה מהם משמש לשימוש חיצוני במהלך חודשי קיץ 2. עם הבנייה חדשה, מערכות השקיה לתכנות קרקע ב- מותקנות לעתים קרובות. למרבה הצער, מערכות אלה לעתים קרובות מתוכנתים לספק השקיה לגינון עירוני בתדירות גבוהה יותר ו / או בהיקפים העולים על דרישות evapotranspiration של הנוף 2. כתוצאה מכך נפח משמעותי של נגר מגינון עירוני למים שקיבלו, אשר תורם למה שזכה לכינוי הנחל עירוני תסמונת 3. סימפטומים של תסמונת הזרם העירונית כוללים העלאת תדר של זרימה יבשתית וזרימה מכרסמת, עלו nitrogen, זרחן (P), רעלים, וטמפרטורה בנוסף לשינויים במורפולוגיה ערוץ, ביולוגיה של מים מתוקים, ומערכת אקולוגית (N) מעבד 3. הפסדים של N וP ממערכות אקולוגיות חקלאיות נחקרו רבים ונמצאו כתלוי בעיקר בארבעה גורמים: מקור תזונתי, קצב יישום, עיתוי יישום, ומיקום תזונתי 4. נתונים שפורסמו פחות בעוד קיימים כיום בתנועה באתר הנחה של חומרים מזינים מנופים עירוניים, המנהלים האלה יכולים להיות מיושמים ישירות לתרבות turfgrass, בין אם במדשאות בית, חוות טפש, פארקים, או שטחים ירוקים אחרים. בנוסף, שיטות השקיה פסולות שיש בי לגרום לניגר מהנוף יכולות להחמיר הפסדים אלה. הפסדי חומר מזין ניתן לשנות עוד יותר על ידי איכות מים להשקיה. אזורים בדרום המערב ארצות הברית לעתים קרובות לנצל יותר מלוחים או מים sodic להשקיה של מדשאות בבית ונופים עירוניים 5,6. ההרכב הכימי שלהמים להשקיה עשויים לשנות באופן משמעותי את הכימיה אדמה גורמים לשחרור של פחמן, חנקן, סידן, וקטיונים אחרים למים נגר. מחקר שנערך לאחרונה הראה כי יחס קליטת נתרן מוגבר (SAR) של המים לחילוץ עלה באופן משמעותי את הסכומים של פחמן (C) וחנקן (N) דלף מקטעי רחוב Augustinegrass, קטעי ryegrass, וחומרים אורגניים אחרים 7. יתר על כן, הפסדי אדמה ניתן להפיק מים C, N, וP מקרקעות turfgrass פנאי היו בקורלציה משמעותית עם מרכיבים כימיים במי השקיה 6. Washbusch et al. למד נגר עירוני במדיסון, ויסקונסין, וגילה שמדשאות היו התורמים הגדולים ביותר של זרחן בסך הכל 8. בנוסף, הם גם מצאו כי 25% מP הכולל ב&quot; Dirt רחוב &quot;מקורו מעלים ודשא קצוץ. בסביבה כפרית טיפוסית, פסולת עלים נופלת על האדמה ולאחר מכן מתפרקת חומרים מזינים משחררים לאט בחזרה ליםסביבת נפט. עם זאת, בסביבה עירונית, כמויות משמעותיות של עלים עשירים בחומרים מזינים ודשא קצוץ עלולות ליפול או לקבל שטפו או פוצצו על hardscapes כגון חניונים, מדרכות, וכבישים, לאחר מכן עושים את דרכם אל תוך הרחובות שבם הם תורמים ל&quot; לכלוך ברחוב &quot; , רבים מהם מקבל שטף ישירות לתוך נתיבי מים שקיבלו. קרקעות נוף עירוניות הן לעתים קרובות מופרעת ודחוסים מאוד במהלך הבנייה, אשר יכולה גם להגדיל את הכמויות של נגר בשל שיעורי חדירה מופחתים 9. Kelling ופיטרסון דיווחו כי שני כולל נגר ריכוזי חומרי ההזנה בניגרות ממדשאות בית נפח והם גדלו ממדשאות שנדחסו או שיש לי קשה פרופילי קרקע מופרעים בשל פעילות הבנייה קודמת 10. Edmondson et al. לעומת זאת, מצא כי קרקעות עירוניות היו פחות דחוסים בהשוואה למקיף קרקעות חקלאיות באזור העירוני ופרברי של Leicאסתר, 11 בריטניה. הם ייחסו זאת למכונות חקלאיות כבדות המשמשות, אבל הם גם ציינו כי היו לי מדשאות צפיפות בצובר אדמה גדולה מאדמה מתחת לעצים ושיחים שיוחסה לכיסוח דשא ורמיסה אנושית גדולה יותר. נראה כי במצבים רבים, תסמונות זרם עירוניות ופרבריות מושפעות באופן משמעותי על ידי נגר ונקודת מקור פולטים 3,12. בעוד ניתן להשפיע נקודת מקורות באמצעות היתרים ומחזור, יש צורך במחקר נוסף כדי לפתח ולבדוק נהלי ניהול הטובים ביותר להקמת מדשאת הבית וניהול כדי למזער את ההפסדים מזינים לניגר. מאמצי המחקר האחרונים בנושא זה פעמים רבות במרכז לאורך אזורי חוף שבם יש קרקעות תוכן חול גבוהות, בשל חששות הקשורים להשפעות של שטיפה וניגר הפסדים של חומרים מזינים למימיי חופים. עם זאת, בעת עבודה עם קרקעות מאוד חוליים, חייב להיות אחד מדרונות תלולים ושיעורי משקעים גבוהים כדי להיות מסוגל generaטה כל נגר 13,14. בניגוד לכך, רב של הקרקעות בארצות הברית המרכזית בסדר מרקם ויש לי שיעורי חדירה נמוכים שיגרמו לכמויות משמעותיות של נגר מאירועי גשמים אפילו קטנים. לכן, זה היה רצוי לתכנן ולבנות מתקן נגר על אדמה ומדרון אופייני לאלה שעלולות להתרחש בנופי מגורים ילידים. מאמר זה מתאר את העיצוב, הבנייה ותפקוד של מתקן 1,000 מ &#39;2 המכיל 24 33.6 מ 2 חלקות שדה בודדות למדידת נפחי נגר סך הכל ברזולוציות זמן קטנות יחסית ואיסוף בו זמני של subsamples מי ניגר בנפח שנבחר או מרווחי זמן למדידה וכימות של מרכיבים כימיים של מי ניגר.

<table border="0" cellpadding="0" cellspacing="0" width="778">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:244px;">Flow meter</td>
			<td style="width:151px;">Teledyne Isco</td>
			<td style="width:216px;">Model 4230</td>
			<td style="width:167px;">Bubbling flow meter that measures and records water flow through flume</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Portable Sampler</td>
			<td>Teledyne Isco</td>
			<td>Model 6712</td>
			<td>Works in conjunction with the flow meter to collect water samples at predetermined intervals.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Flow Link Software to collect data</td>
			<td>Teledyne Isco</td>
			<td>Ver 5.0</td>
			<td>Allows communication between flow meter and computer</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Pre-sloped trench drain</td>
			<td>Zurn Industries, LLC</td>
			<td>Z-886</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Irrigation Controller</td>
			<td>Toro Company</td>
			<td>VP Satellite</td>
			<td>Controls irrigation to each plot individually</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Electric Valves</td>
			<td>Hunter</td>
			<td>2.5 cm PGV</td>
			<td>Opens or closes water flow to individual plots based on signal from irrigation controller</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Spray nozzles</td>
			<td>RainBird</td>
			<td>HE-Van 12</td>
			<td>Sprays irrigation water in predetermined pattern and rate</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Irrigation heads</td>
			<td>Hunter</td>
			<td>Pro Spray 4</td>
			<td>4 inch pop up spray heads</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">6 inch slotted drain pipe</td>
			<td>Advanced Drainage Systems</td>
			<td>6410100</td>
			<td>single wall corregated HDPE - slotted</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">6 inch plain drain pipe</td>
			<td>Advanced Drainage Systems</td>
			<td>6400100</td>
			<td>single wall corregated HDPE - plain</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Filter Paper</td>
			<td>Whatman GF/F</td>
			<td>1825-047</td>
			<td>47mm diameter, binder-free, glass microfiber filter</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">pH Meter</td>
			<td>Fisher</td>
			<td>Accumet XL20</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Combination pH probe</td>
			<td>Fisher</td>
			<td>13-620-130</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Automatic Temperature Compensating Probe</td>
			<td>Fisher</td>
			<td>13-602-19</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Electrical conductivity probe</td>
			<td>Fisher</td>
			<td>13-620-100</td>
			<td>Cell constant of 1.0</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">&#160;TOC-VCSH with total nitrogen unit TMN-1</td>
			<td>Shimadzu Corp</td>
			<td>TOC-VCSH with TMN-1</td>
			<td>dissolved C and N analyzer</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Smartchem 200</td>
			<td>Unity Scientific</td>
			<td>200</td>
			<td>Discrete Analyzer for P measurement</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">ICS 1000</td>
			<td>Dionex</td>
			<td>ICS 1000</td>
			<td>Ion Chromatography for Ca, Mg, K and Na measurment</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:244px;">Portable Soil Moisture Meter</td>
			<td>Spectrum&#160;</td>
			<td style="width:216px;">FieldScout TDR 300</td>
			<td>7.5 cm long probes</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:244px;">Totallizing Water Meters</td>
			<td style="width:151px;">Badger</td>
			<td style="width:216px;">3/4 inch water meters</td>
			<td>standard homeowner water meters</td>
		</tr>
	</tbody>
</table>

design and construction of an urban runoff research facility

ככל שעולה האוכלוסייה העירונית, כך גם האזור של נוף עירוני שלחין. שימוש במים בקיץ באזורים עירוניים יכול להיות שימוש במי שורת 2-3x בסיס החורף בשל גידול בביקוש להשקיה נוף. שיטות השקיה פסולות ואירועי גשמים גדולים יכולים לגרום לניגר מנופים עירוניים שבו יש פוטנציאל לביצוע חומרים מזינים ומשקעים לנחלים מקומיים ואגמים שבו הם יכולים לתרום לאאוטריפיקציה. מתקן 1,000 מ &#39;2 נבנה אשר מורכב מ24 חלקות בודדות 33.6 מ 2 שדה, כל אחד מצויד למדידת נפחי נגר סך הכל עם זמן ואוסף של subsamples נגר במרווחים שנבחרו לכימות של מרכיבים כימיים במים ניגר מנופים עירוניים מדומים. כרכים נגר מן הניסויים הראשונים והשני היו מקדם השתנות (CV) ערכים של 38.2 ו28.7%, בהתאמה. ערכי קורות חיים לpH נגר, EC, וריכוז Na עבור שני הניסויים היו כולם תחת 10%. Concentrations של DOC, TDN, DON, PO 4 -P, K +, Mg 2 +, וCa 2 + היו לי ערכי קורות חיים פחות מ 50% בשני הניסויים. בסך הכל, התוצאות של בדיקות שבוצעו לאחר התקנת טפש במתקן מצויינים אחידות טובה בין מגרשים לכרכים נגר ומרכיבים כימיים. גודל מגרש הגדול מספיק כדי לכלול הרבה של ההשתנות הטבעית ולכן מספק סימולציה טובה יותר של מערכות אקולוגיות בנוף אורבאנית.

מאפייני עלילה השיפוע הממוצע לכל 24 החלקות היה .3.7% ונע בין נמוך של .3.2% לעלילה 17 לגבוהה של .4.1% לעלילה 2 (טבלה 1). עובי שכבת קרקע עליונה הממוצע היה 36 סנטימטר ונע בין נמוך של 25.0 סנטימטר לעלילה 24 עד גבוהה של 51.5 סנטימטר לעלילה 10 (טבלה 1). <p class="jove_content" style=";text...

Watch this Scientific Journal Video about Design and Construction of an Urban Runoff Research Facility at JoVE.com

Design and Construction of an Urban Runoff Research Facility

מאמר זה מתאר את העיצוב, בנייה, ותפקוד של מתקן 1,000 מ &#39;2 המכיל 24 חלקות 33.6 מ 2 שדות בודדים מצוידות למדידת נפחי נגר סך הכל עם זמן ואוסף של subsamples נגר במרווחים שנבחרו לכימות של מרכיבים כימיים במים ניגר מ מדשאות בית מדומה.

עיצוב ובנייה של מתקן מחקר ניגר עירוני

As the urban population increases, so does the area of irrigated urban landscape. Summer water use in urban areas can be 2-3x winter base line water use ...

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13.0K Views.  Texas A&M University.  מאמר זה מתאר את העיצוב, בנייה, ותפקוד של מתקן 1,000 מ '2 המכיל 24 חלקות 33.6 מ 2 שדות בודדים מצוידות למדידת נפחי נגר סך הכל עם זמן ואוסף של subsamples נגר במרווחים שנבחרו לכימות של מרכיבים כימיים במים ניגר מ מדשאות בית מדומה. 

Video: Design and Construction of an Urban Runoff Research Facility

Design and Operation of a Continuous 13C and 15N Labeling Chamber for Uniform or Differential, Metabolic and Structural, Plant Isotope Labeling

Tracing rare stable isotopes from plant material through the ecosystem provides the most sensitive information about ecosystem processes; from CO2 fluxes and soil organic matter formation to small-scale stable-isotope biomarker probing. Coupling multiple stable isotopes such as 13C with 15N, 18O or&#160;2H has the potential to reveal even more information about complex stoichiometric relationships during biogeochemical transformations. Isotope labeled plant material has been used in various studies of litter decomposition and soil organic matter formation1-4. From these and other studies, however, it has become apparent that structural components of plant material behave differently than metabolic components (i.e. leachable low molecular weight compounds) in terms of microbial utilization and long-term carbon storage5-7. The ability to study structural and metabolic components separately provides a powerful new tool for advancing the forefront of ecosystem biogeochemical studies. Here we describe a method for producing 13C and 15N labeled plant material that is either uniformly labeled throughout the plant or differentially labeled in structural and metabolic plant components.
Here, we present the construction and operation of a continuous 13C and 15N labeling chamber that can be modified to meet various research needs. Uniformly labeled plant material is produced by continuous labeling from seedling to harvest, while differential labeling is achieved by removing the growing plants from the chamber weeks prior to harvest. Representative results from growing Andropogon gerardii Kaw demonstrate the system&#39;s ability to efficiently label plant material at the targeted levels. Through this method we have produced plant material with a 4.4 atom%13C and 6.7 atom%15N uniform plant label, or material that is differentially labeled by up to 1.29 atom%13C and 0.56 atom%15N in its metabolic and structural components (hot water extractable and hot water residual components, respectively). Challenges lie in maintaining proper temperature, humidity, CO2 concentration,&#160;and light levels in an airtight 13C-CO2 atmosphere for successful plant production. This chamber description represents a useful research tool to effectively produce uniformly or differentially multi-isotope labeled plant material for use in experiments on ecosystem biogeochemical cycling.

Design and Operation of a Continuous 13C and 15N Labeling Chamber for Uniform or Differential, Metabolic and Structural, Plant Isotope Labeling

This method explains how to build and operate a continuous 13C and 15N isotope labeling chamber for uniform or differential plant tissue labeling. Representative results from metabolic and structural labeling of Andropogon gerardii are discussed.

עיצוב והפעלה של רציף<sup&gt; 13</sup&gt; C ו<sup&gt; 15</sup&gt; N תיוג הלשכה לאחיד או דיפרנציאלי, מטבולית ומבנית, צמח איזוטופ תיוג

Tracing rare stable isotopes from plant material through the ecosystem provides the most sensitive information about ecosystem processes; from CO2 fluxes ...

A Protocol for Conducting Rainfall Simulation to Study Soil Runoff

Rainfall is a driving force for the transport of environmental contaminants from agricultural soils to surficial water bodies via surface runoff. The objective of this study was to characterize the effects of antecedent soil moisture content on the fate and transport of surface applied commercial urea, a common form of nitrogen (N) fertilizer, following a rainfall event that occurs within 24&#160;hr&#160;after fertilizer application. Although urea is assumed to be readily hydrolyzed to ammonium and therefore not often available for transport, recent studies suggest that urea can be transported from agricultural soils to coastal waters where it is implicated in harmful algal blooms. A rainfall simulator was used to apply a consistent rate of uniform rainfall across packed soil boxes that had been prewetted to different soil moisture contents. By controlling rainfall and soil physical characteristics, the effects of antecedent soil moisture on urea loss were isolated. Wetter soils exhibited shorter time from rainfall initiation to runoff initiation, greater total volume of runoff, higher urea concentrations in runoff, and greater mass loadings of urea in runoff. These results also demonstrate the importance of controlling for antecedent soil moisture content in studies designed to isolate other variables, such as soil physical or chemical characteristics, slope, soil cover, management, or rainfall characteristics. Because rainfall simulators are designed to deliver raindrops of similar size and velocity as natural rainfall, studies conducted under a standardized protocol can yield valuable data that, in turn, can be used to develop models for predicting the fate and transport of pollutants in runoff.

A rainfall simulator was used to apply a consistent rate of uniform rainfall to packed soil boxes in a study of the fate and transport of urea, a nonpoint source environmental contaminant. Under uniform soil and rainfall conditions, antecedent soil moisture content exerted strong control over urea loss in surface runoff.

פרוטוקול לעריכת סימולציה גשם לחקר ניגר קרקע

Rainfall is a driving force for the transport of environmental contaminants from agricultural soils to surficial water bodies via surface runoff. The ...

A CO2 Concentration Gradient Facility for Testing CO2 Enrichment and Soil Effects on Grassland Ecosystem Function

Continuing increases in atmospheric carbon dioxide concentrations (CA) mandate techniques for examining impacts on terrestrial ecosystems. Most experiments examine only two or a few levels of CA concentration and a single soil type, but if CA can be varied as a gradient from subambient to superambient concentrations on multiple soils, we can discern whether past ecosystem responses may continue linearly in the future and whether responses may vary across the landscape. The Lysimeter Carbon Dioxide Gradient Facility applies a 250 to 500 &#181;l L-1 CA gradient to Blackland prairie plant communities established on lysimeters containing clay, silty clay, and sandy soils. The gradient is created as photosynthesis by vegetation enclosed in in temperature-controlled chambers progressively depletes carbon dioxide from air flowing directionally through the chambers. Maintaining proper air flow rate, adequate photosynthetic capacity, and temperature control are critical to overcome the main limitations of the system, which are declining photosynthetic rates and increased water stress during summer. The facility is an economical alternative to other techniques of CA enrichment, successfully discerns the shape of ecosystem responses to subambient to superambient CA enrichment, and can be adapted to test for interactions of carbon dioxide with other greenhouse gases such as methane or ozone.

A CO2 Concentration Gradient Facility for Testing CO2 Enrichment and Soil Effects on Grassland Ecosystem Function

The Lysimeter Carbon Dioxide Gradient Facility creates a 250 to 500 &#181;l L-1 linear carbon dioxide gradient in temperature-controlled chambers housing grassland plant communities on clay, silty clay, and sandy soil monoliths. The facility is used to determine how past and future carbon dioxide levels affect grassland carbon cycling.

CO<sub&gt; 2</sub&gt; מתקן מפל ריכוזים לבדיקה CO<sub&gt; 2</sub&gt; העשרה וקרקע השפעות על תפקוד המערכת האקולוגית גראסלאנד

Continuing increases in atmospheric carbon dioxide concentrations (CA) mandate techniques for examining impacts on terrestrial ecosystems. Most ...

Spotting Cheetahs: Identifying Individuals by Their Footprints

The cheetah (Acinonyx jubatus) is Africa's most endangered large felid and listed as Vulnerable with a declining population trend by the IUCN1. It ranges widely over sub-Saharan Africa and in parts of the Middle East. Cheetah conservationists face two major challenges, conflict with landowners over the killing of domestic livestock, and concern over range contraction. Understanding of the latter remains particularly poor2. Namibia is believed to support the largest number of cheetahs of any range country, around 30%, but estimates range from 2,9053 to 13,5204. The disparity is likely a result of the different techniques used in monitoring.
Current techniques, including invasive tagging with VHF or satellite/GPS collars, can be costly and unreliable. The footprint identification technique5 is a new tool accessible to both field scientists and also citizens with smartphones, who could potentially augment data collection. The footprint identification technique analyzes digital images of footprints captured according to a standardized protocol. Images are optimized and measured in data visualization software. Measurements of distances, angles, and areas of the footprint images are analyzed using a robust cross-validated pairwise discriminant analysis based on a customized model. The final output is in the form of a Ward's cluster dendrogram. A user-friendly graphic user interface (GUI) allows the user immediate access and clear interpretation of classification results.
The footprint identification technique algorithms are species specific because each species has a unique anatomy. The technique runs in a data visualization software, using its own scripting language (jsl) that can be customized for the footprint anatomy of any species. An initial classification algorithm is built from a training database of footprints from that species, collected from individuals of known identity. An algorithm derived from a cheetah of known identity is then able to classify free-ranging cheetahs of unknown identity. The footprint identification technique predicts individual cheetah identity with an accuracy of &gt;90%.

The cheetah (Acinonyx jubatus) is an iconic, endangered species, but conservation efforts are challenged by habitat shrinkage and conflict with commercial farmers. The footprint identification technique, a robust, accurate and cost-effective image classification system, is a new approach to monitoring cheetahs.

בחינת ברדלסים: אנשי זיהוי על ידי עקביהם

The cheetah (Acinonyx jubatus) is Africa's most endangered large felid and listed as Vulnerable with a declining population trend by the IUCN1. It ranges ...

Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff

Urban stormwater and agriculture irrigation runoff contain a complex mixture of contaminants that are often toxic to adjacent receiving waters. Runoff may be treated with simple systems designed to promote sorption of contaminants to vegetation and soils and promote infiltration. Two example systems are described: a bioswale treatment system for urban stormwater treatment, and a vegetated drainage ditch for treating agriculture irrigation runoff. Both have similar attributes that reduce contaminant loading in runoff: vegetation that results in sorption of the contaminants to the soil and plant surfaces, and water infiltration. These systems may also include the integration of granulated activated carbon as a polishing step to remove residual contaminants. Implementation of these systems in agriculture and urban watersheds requires system monitoring to verify treatment efficacy. This includes chemical monitoring for specific contaminants responsible for toxicity. The current paper emphasizes monitoring of current use pesticides since these are responsible for surface water toxicity to aquatic invertebrates.

This article summarizes the design attributes and the effectiveness of treatment systems that treat urban stormwater and agriculture irrigation runoff to remove pesticides and other contaminants associated with aquatic toxicity.

מערכות טיפול צמחי להסרת מזהמים המשויכים לרעלת פני המים בחקלאות ובנוף העירוני

Urban stormwater and agriculture irrigation runoff contain a complex mixture of contaminants that are often toxic to adjacent receiving waters. Runoff may ...

Rearing and Long-Term Maintenance of Eristalis tenax Hoverflies for Research Studies

With an estimated 6000 species worldwide, hoverflies are ecologically important as alternative pollinators to domesticated honeybees. However, they are also a useful scientific model to study motion vision and flight dynamics in a controlled laboratory setting. As the larvae develop in organically polluted water, they are useful models for investigating investment in microbial immunity. While large scale commercial breeding for agriculture already occurs, there are no standardized protocols for maintaining captive populations for scientific studies. This is important as commercial captive breeding programs focusing on mass output during peak pollination periods may fail to provide a population that is consistent, stable and robust throughout the year, as is often needed for other research purposes. Therefore, a method to establish, maintain and refresh a captive research population is required. Here, we describe the utilization of an artificial hibernation cycle, in addition to the nutritional and housing requirements, for long term maintenance of Eristalis tenax. Using these methods, we have significantly increased the health and longevity of captive populations of E. tenax compared to previous reports. We furthermore discuss small scale rearing methods and options for optimizing yields and manipulating population demographics.

Rearing and Long-Term Maintenance of Eristalis tenax Hoverflies for Research Studies

The overall goal of these procedures is to establish, maintain and refresh a captive population of Eristalis tenax in a research setting.

לגידול ואחזקה ארוך טווח של רקבן הבוץ Hoverflies למטרות מחקר

With an estimated 6000 species worldwide, hoverflies are ecologically important as alternative pollinators to domesticated honeybees. However, they are ...

Design and Use of an Apparatus for Quantifying Bivalve Suspension Feeding at Sea

As shellfish aquaculture moves from coastal embayments and estuaries to offshore locations, the need to quantify ecosystem interactions of farmed bivalves (i.e., mussels, oysters, and clams) presents new challenges. Quantitative data on the feeding behavior of suspension-feeding mollusks is necessary to determine important ecosystem interactions of offshore shellfish farms, including their carrying capacity, the competition with the zooplankton community, the availability of trophic resources at different depths, and the deposition to the benthos. The biodeposition method is used to quantify feeding variables in suspension-feeding bivalves in a natural setting and represents a more realistic proxy than laboratory experiments. This method, however, relies upon a stable platform to satisfy the requirements that water flow rates supplied to the shellfish remain constant and the bivalves are undisturbed. A flow-through device and process for using the biodeposition method to quantify the feeding of bivalve mollusks were modified from a land-based format for shipboard use by building a two-dimensional gimbal table around the device. Planimeter data reveal a minimal pitch and yaw of the chambers containing the test shellfish despite boat motion, the flow rates within the chambers remain constant, and operators are able to collect the biodeposits (feces and pseudofeces) with sufficient consistency to obtain accurate measurements of the bivalve clearance, filtration, selection, ingestion, rejection, and absorption at offshore shellfish aquaculture sites.

A flow-through device for using the biodeposition method to quantify filtration and feeding behavior of bivalve mollusks was modified for shipboard use. A two-dimensional gimbal table built around the device isolates the apparatus from boat motion, thereby allowing the accurate quantification of bivalve filtration variables at offshore shellfish aquaculture sites.

עיצוב ושימוש של מנגנון לכימות תנועת השעיה של ביואלו האכלה בים

As shellfish aquaculture moves from coastal embayments and estuaries to offshore locations, the need to quantify ecosystem interactions of farmed bivalves ...

Construction of a Low-cost Mobile Incubator for Field and Laboratory Use

Incubators are essential for a range of culture-based microbial methods, such as membrane filtration followed by cultivation for assessing drinking water quality. However, commercially available incubators are often costly, difficult to transport, not flexible in terms of volume, and/or poorly adapted to local field conditions where access to electricity is unreliable. The purpose of this study was to develop an adaptable, low-cost and transportable incubator that can be constructed using readily available components. The electronic core of the incubator was first developed. These components were then tested under a range of ambient temperature conditions (3.5 &#176;C - 39 &#176;C) using three types of incubator shells (polystyrene foam box, hard cooler box, and cardboard box covered with a survival blanket). The electronic core showed comparable performance to a standard laboratory incubator in terms of the time required to reach the set temperature, inner temperature stability and spatial dispersion, power consumption, and microbial growth. The incubator set-ups were also effective at moderate and low ambient temperatures (between 3.5 &#176;C and 27 &#176;C), and at high temperatures (39 &#176;C) when the incubator set temperature was higher. This incubator prototype is low-cost (&lt; 300 USD) and adaptable to a variety of materials and volumes. Its demountable structure makes it easy to transport. It can be used in both established laboratories with grid power or in remote settings powered by solar energy or a car battery. It is particularly useful as an equipment option for field laboratories in areas with limited access to resources for water quality monitoring.

This paper describes a method for building an adaptable, low-cost and transportable incubator for microbial testing of drinking water. Our design is based on widely available materials and can operate under a range of field conditions, while still offering the advantages of higher-end laboratory-based models.

הקמת חממה נייד בעלות נמוכה עבור שדה והשתמש מעבדה

Incubators are essential for a range of culture-based microbial methods, such as membrane filtration followed by cultivation for assessing drinking water ...

Combining Eye-tracking Data with an Analysis of Video Content from Free-viewing a Video of a Walk in an Urban Park Environment

As individuals increasingly live in cities, methods to study their everyday movements and the data that can be collected becomes important and valuable. Eye-tracking informatics are known to connect to a range of feelings, health conditions, mental states and actions. But because vision is the result of constant eye-movements, teasing out what is important from what is noise is complex and data intensive. Furthermore, a significant challenge is controlling for what people look at compared to what is presented to them.
The following presents a methodology for combining and analyzing eye-tracking on a video of a natural and complex scene with a machine learning technique for analyzing the content of the video. In the protocol we focus on analyzing data from filmed videos, how a video can be best used to record participants&#39; eye-tracking data, and importantly how the content of the video can be analyzed and combined with the eye-tracking data. We present a brief summary of the results and a discussion of the potential of the method for further studies in complex environments.

The objective of the protocol is to detail how to collect video data for use in the laboratory; how to record eye-tracking data of participants looking at the data and how to efficiently analyze the content of the videos that they were looking at using a machine learning technique.

שילוב נתוני מעקב אחר עיניים באמצעות ניתוח של תוכן וידאו מחינם-צפייה בסרטון וידאו של טיול בסביבה של פארק עירוני

As individuals increasingly live in cities, methods to study their everyday movements and the data that can be collected becomes important and valuable. ...

Sampling Soils in a Heterogeneous Research Plot

Soils are highly heterogeneous. In general, the number of soil samples required for soil research has always been determined arbitrarily and the associated accuracy is unknown. Here, we present a detailed protocol for efficient and clustered soil sampling in a research plot and, relying on a pilot sampling using this design, for demonstrating soil spatial heterogeneity and informing reasonable sample sizes and associated accuracy for future study. The protocol mainly comprises four steps: sampling design, field collection, soil analysis, and geostatistical analysis. The step-by-step procedure is modified according to former publications. Two examples will be presented to demonstrate contrasting spatial distributions of soil organic carbon (SOC) and soil microbial biomass carbon (MBC) under different management practices. In addition, we present a strategy to determine the sample size requirement (SSR) given a certain level of accuracy based on the plot-level coefficient of variation (CV). The field sampling protocol and the quantitative determination of the sample size will assist researchers in seeking feasible sampling strategies to meet research needs and resources' availability.

The traditional soil-sampling procedure determines the number of soil samples arbitrarily. Here, we provide a simple yet efficient clustered soil-sampling design to demonstrate soil spatial heterogeneity and quantitatively determine the number of soil samples required and the associated sampling accuracy.