Grassed buffer strips for the control of nitrate leaching to surface waters in headwater catchments
Identifieur interne : 000739 ( Istex/Corpus ); précédent : 000738; suivant : 000740Grassed 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. HarrodSource :
- Ecological Engineering [ 0925-8574 ] ; 1999.
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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<front><div type="abstract" xml: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.</div>
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<notesStmt><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>
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<abstract xml:lang="en"><p>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.</p>
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<ce:abstract-sec><ce:simple-para>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<ce:sup>−1</ce:sup>
, but peaked at up to 46.1 mgN l<ce:sup>−1</ce:sup>
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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>
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