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Titolo:
MONITORING SHALLOW GROUNDWATER QUALITY IN AGRICULTURAL WATERSHEDS IN DENMARK
Autore:
RASMUSSEN P;
Indirizzi:
GEOL SURVEY DENMARK,THORAVEJ 8 DK-2400 COPENHAGEN NV DENMARK
Titolo Testata:
Environmental geology
fascicolo: 4, volume: 27, anno: 1996,
pagine: 309 - 319
SICI:
0943-0105(1996)27:4<309:MSGQIA>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Keywords:
GROUNDWATER QUALITY; AGRICULTURAL WATERSHEDS; MONITORING; NITRATE; SHALLOW GROUNDWATER; DENMARK;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
P. Rasmussen, "MONITORING SHALLOW GROUNDWATER QUALITY IN AGRICULTURAL WATERSHEDS IN DENMARK", Environmental geology, 27(4), 1996, pp. 309-319

Abstract

Monitoring of shallow groundwater quality is part of the Danish Agricultural Watershed Monitoring Programme. The monitoring program provides fast and field-related information on impacts of changes in agricultural practices on a watershed scale. The monitoring concept described is carried out in six well-defined hydrological basins and includes new types of groundwater nests and soil water stations. Results from thefirst three years are presented through examples from the clayey tillwatershed Lillebaek and the sandy watershed Barslund Bak. By averaging concentrations of solutes in groundwater sampled at the same depth on a monthly basis, it is possible to evaluate trends in the overall impact of climate and different agricultural practices in a watershed onthe groundwater quality. Characteristic seasonal variations in nitrate concentrations related to water level fluctuations was observed. Themonitoring has demonstrated significantly higher nitrate concentrations in groundwater sampled downgradient of fields receiving manure thanin groundwater sampled downgradient of fertilized fields. Significantvertical nitrate reduction downgradient of manured fields was observed in both the sandy and the clayey watershed though above the redoxcline. In the clayey till watershed fast vertical transport and insignificant nitrate reduction was observed downgradient of fertilized fields probably due to fracture and macro-pore flow.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 17:40:05