Before and after integrated catchment management in a headwater catchment: changes in water quality.
Identifieur interne : 002354 ( Main/Exploration ); précédent : 002353; suivant : 002355Before and after integrated catchment management in a headwater catchment: changes in water quality.
Auteurs : Andrew O. Hughes [Nouvelle-Zélande] ; John M. QuinnSource :
- Environmental management [ 1432-1009 ] ; 2014.
Descripteurs français
- KwdFr :
- Agriculture (méthodes), Alimentation en eau (MeSH), Animaux (MeSH), Arbres (MeSH), Azote (analyse), Bovins (MeSH), Conservation des ressources naturelles (méthodes), Mouvements de l'eau (MeSH), Nouvelle-Zélande (MeSH), Ovis (MeSH), Phosphore (analyse), Qualité de l'eau (MeSH), Rivières (composition chimique), Sédiments géologiques (composition chimique).
- MESH :
- analyse : Azote, Phosphore.
- composition chimique : Rivières, Sédiments géologiques.
- méthodes : Agriculture, Conservation des ressources naturelles.
- Alimentation en eau, Animaux, Arbres, Bovins, Mouvements de l'eau, Nouvelle-Zélande, Ovis, Qualité de l'eau.
English descriptors
- KwdEn :
- Agriculture (methods), Animals (MeSH), Cattle (MeSH), Conservation of Natural Resources (methods), Geologic Sediments (chemistry), New Zealand (MeSH), Nitrogen (analysis), Phosphorus (analysis), Rivers (chemistry), Sheep (MeSH), Trees (MeSH), Water Movements (MeSH), Water Quality (MeSH), Water Supply (MeSH).
- MESH :
- chemical , analysis : Nitrogen, Phosphorus.
- chemistry : Geologic Sediments, Rivers.
- methods : Agriculture, Conservation of Natural Resources.
- Animals, Cattle, New Zealand, Sheep, Trees, Water Movements, Water Quality, Water Supply.
Abstract
Few studies have comprehensively measured the effect on water quality of catchment rehabilitation measures in comparison with baseline conditions. Here we have analyzed water clarity and nutrient concentrations and loads for a 13-year period in a headwater catchment within the western Waikato region, New Zealand. For the first 6 years, the entire catchment was used for hill-country cattle and sheep grazing. An integrated catchment management plan was implemented whereby cattle were excluded from riparian areas, the most degraded land was planted in Pinus radiata, channel banks were planted with poplar trees and the beef cattle enterprise was modified. The removal of cattle from riparian areas without additional riparian planting had a positive and rapid effect on stream water clarity. In contrast, the water clarity decreased in those sub-catchments where livestock was excluded but riparian areas were planted with trees and shrubs. We attribute the decrease in water clarity to a reduction in groundcover vegetation that armors stream banks against preparatory erosion processes. Increases in concentrations of forms of P and N were recorded. These increases were attributed to: (i) the reduction of instream nutrient uptake by macrophytes and periphyton due to increased riparian shading; (ii) uncontrolled growth of a nitrogen fixing weed (gorse) in some parts of the catchment, and (iii) the reduction in the nutrient attenuation capacity of seepage wetlands due to the decrease in their areal coverage in response to afforestation. Our findings highlight the complex nature of the water quality response to catchment rehabilitation measures.
DOI: 10.1007/s00267-014-0369-9
PubMed: 25228091
Affiliations:
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Le document en format XML
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Here we have analyzed water clarity and nutrient concentrations and loads for a 13-year period in a headwater catchment within the western Waikato region, New Zealand. For the first 6 years, the entire catchment was used for hill-country cattle and sheep grazing. An integrated catchment management plan was implemented whereby cattle were excluded from riparian areas, the most degraded land was planted in Pinus radiata, channel banks were planted with poplar trees and the beef cattle enterprise was modified. The removal of cattle from riparian areas without additional riparian planting had a positive and rapid effect on stream water clarity. In contrast, the water clarity decreased in those sub-catchments where livestock was excluded but riparian areas were planted with trees and shrubs. We attribute the decrease in water clarity to a reduction in groundcover vegetation that armors stream banks against preparatory erosion processes. Increases in concentrations of forms of P and N were recorded. These increases were attributed to: (i) the reduction of instream nutrient uptake by macrophytes and periphyton due to increased riparian shading; (ii) uncontrolled growth of a nitrogen fixing weed (gorse) in some parts of the catchment, and (iii) the reduction in the nutrient attenuation capacity of seepage wetlands due to the decrease in their areal coverage in response to afforestation. Our findings highlight the complex nature of the water quality response to catchment rehabilitation measures.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" IndexingMethod="Curated" Owner="NLM"><PMID Version="1">25228091</PMID><DateCompleted><Year>2015</Year><Month>05</Month><Day>08</Day></DateCompleted><DateRevised><Year>2018</Year><Month>12</Month><Day>02</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1432-1009</ISSN><JournalIssue CitedMedium="Internet"><Volume>54</Volume><Issue>6</Issue><PubDate><Year>2014</Year><Month>Dec</Month></PubDate></JournalIssue><Title>Environmental management</Title><ISOAbbreviation>Environ Manage</ISOAbbreviation></Journal><ArticleTitle>Before and after integrated catchment management in a headwater catchment: changes in water quality.</ArticleTitle><Pagination><MedlinePgn>1288-305</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1007/s00267-014-0369-9</ELocationID><Abstract><AbstractText>Few studies have comprehensively measured the effect on water quality of catchment rehabilitation measures in comparison with baseline conditions. Here we have analyzed water clarity and nutrient concentrations and loads for a 13-year period in a headwater catchment within the western Waikato region, New Zealand. For the first 6 years, the entire catchment was used for hill-country cattle and sheep grazing. An integrated catchment management plan was implemented whereby cattle were excluded from riparian areas, the most degraded land was planted in Pinus radiata, channel banks were planted with poplar trees and the beef cattle enterprise was modified. The removal of cattle from riparian areas without additional riparian planting had a positive and rapid effect on stream water clarity. In contrast, the water clarity decreased in those sub-catchments where livestock was excluded but riparian areas were planted with trees and shrubs. We attribute the decrease in water clarity to a reduction in groundcover vegetation that armors stream banks against preparatory erosion processes. Increases in concentrations of forms of P and N were recorded. These increases were attributed to: (i) the reduction of instream nutrient uptake by macrophytes and periphyton due to increased riparian shading; (ii) uncontrolled growth of a nitrogen fixing weed (gorse) in some parts of the catchment, and (iii) the reduction in the nutrient attenuation capacity of seepage wetlands due to the decrease in their areal coverage in response to afforestation. Our findings highlight the complex nature of the water quality response to catchment rehabilitation measures.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Hughes</LastName><ForeName>Andrew O</ForeName><Initials>AO</Initials><AffiliationInfo><Affiliation>National Institute of Water and Atmospheric Research Limited, P.O. 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Quinn</name></noCountry><country name="Nouvelle-Zélande"><noRegion><name sortKey="Hughes, Andrew O" sort="Hughes, Andrew O" uniqKey="Hughes A" first="Andrew O" last="Hughes">Andrew O. Hughes</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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