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Grassed buffer strips for the control of nitrate leaching to surface waters in headwater catchments

Identifieur interne : 000739 ( Istex/Corpus ); précédent : 000738; suivant : 000740

Grassed buffer strips for the control of nitrate leaching to surface waters in headwater catchments

Auteurs : P. B Leeds-Harrison ; J. N Quinton ; M. J Walker ; C. L Sanders ; T. Harrod

Source :

RBID : ISTEX:7BCA8DE42E28FC254089D3A1F132E12975F705AA

Abstract

The use of riparian buffer strips is a possible strategy for controlling diffuse nitrate pollution of surface water in agricultural catchments. Data collected from paired buffered and unbuffered headwater catchments at three sites with conditions representative of much of the agricultural land in England and Wales, showed that grassed buffers did not substantially reduce nitrate–nitrogen concentrations entering the streams. Median nitrate–nitrogen levels observed in buffered catchments ranged from 7.6 to 18.8 mgN l−1, but peaked at up to 46.1 mgN l−1. The existence of preferential bypass flow paths during the winter flow events limited the effectiveness of nitrate removing processes within the strips. The findings suggest that grassed riparian buffer strips may not be effective in controlling diffuse nitrate pollution unless the hydrology of the strip allows a suitable environment for denitrification and/or plant uptake. Grassed buffer strips should be carefully targeted or, alternatively, engineered to ensure adequate residence time of solutes within the strip.

Url:
DOI: 10.1016/S0925-8574(98)00075-5

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ISTEX:7BCA8DE42E28FC254089D3A1F132E12975F705AA

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<note type="content">Fig. 1: Site locations and headwater catchments for the three areas investigated. Shaded areas indicate the buffered streams.</note>
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<namePart type="family">Harrod</namePart>
<affiliation>School of Agriculture Food and Environment, Cranfield University, Silsoe, Bedfordshire MK45 4DT, UK</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<typeOfResource>text</typeOfResource>
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<originInfo>
<publisher>ELSEVIER</publisher>
<dateIssued encoding="w3cdtf">1999</dateIssued>
<dateModified encoding="w3cdtf">1998-06-05</dateModified>
<copyrightDate encoding="w3cdtf">1999</copyrightDate>
</originInfo>
<language>
<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
<languageTerm type="code" authority="rfc3066">en</languageTerm>
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<abstract lang="en">The use of riparian buffer strips is a possible strategy for controlling diffuse nitrate pollution of surface water in agricultural catchments. Data collected from paired buffered and unbuffered headwater catchments at three sites with conditions representative of much of the agricultural land in England and Wales, showed that grassed buffers did not substantially reduce nitrate–nitrogen concentrations entering the streams. Median nitrate–nitrogen levels observed in buffered catchments ranged from 7.6 to 18.8 mgN l−1, but peaked at up to 46.1 mgN l−1. The existence of preferential bypass flow paths during the winter flow events limited the effectiveness of nitrate removing processes within the strips. The findings suggest that grassed riparian buffer strips may not be effective in controlling diffuse nitrate pollution unless the hydrology of the strip allows a suitable environment for denitrification and/or plant uptake. Grassed buffer strips should be carefully targeted or, alternatively, engineered to ensure adequate residence time of solutes within the strip.</abstract>
<note type="content">Fig. 1: Site locations and headwater catchments for the three areas investigated. Shaded areas indicate the buffered streams.</note>
<note type="content">Fig. 2: Summary of nitrate concentrations (winters of 1994–95 and 1995–96): OU, Oxfordshire unbuffered; OB, Oxfordshire buffered; BU, Bedfordshire unbuffered; BB, Bedfordshire buffered; SU, Shropshire unbuffered; SB, Shropshire buffered.</note>
<note type="content">Fig. 3: Hydrographs for (a) Bedfordshire and (b) Oxfordshire buffered and unbuffered catchments (winter 1995–96).</note>
<note type="content">Table 1: Maximum and mean recession time constants and times to peak flow in study catchments (winter 1995–1996 events)</note>
<subject>
<genre>Keywords</genre>
<topic>Grassed buffer strip</topic>
<topic>Nitrate removal</topic>
<topic>Hydrology</topic>
<topic>Headwater catchments</topic>
</subject>
<relatedItem type="host">
<titleInfo>
<title>Ecological Engineering</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>ECOENG</title>
</titleInfo>
<genre type="journal">journal</genre>
<originInfo>
<dateIssued encoding="w3cdtf">199902</dateIssued>
</originInfo>
<identifier type="ISSN">0925-8574</identifier>
<identifier type="PII">S0925-8574(00)X0026-2</identifier>
<part>
<date>199902</date>
<detail type="volume">
<number>12</number>
<caption>vol.</caption>
</detail>
<detail type="issue">
<number>3–4</number>
<caption>no.</caption>
</detail>
<extent unit="issue pages">
<start>181</start>
<end>430</end>
</extent>
<extent unit="pages">
<start>299</start>
<end>313</end>
</extent>
</part>
</relatedItem>
<identifier type="istex">7BCA8DE42E28FC254089D3A1F132E12975F705AA</identifier>
<identifier type="DOI">10.1016/S0925-8574(98)00075-5</identifier>
<identifier type="PII">S0925-8574(98)00075-5</identifier>
<accessCondition type="use and reproduction" contentType="copyright">©1999 Elsevier Science B.V.</accessCondition>
<recordInfo>
<recordContentSource>ELSEVIER</recordContentSource>
<recordOrigin>Elsevier Science B.V., ©1999</recordOrigin>
</recordInfo>
</mods>
</metadata>
<serie></serie>
</istex>
</record>

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