Alternative strategies for reducing nitrogen loading

Citation
Jj. Jensen et E. Skop, Alternative strategies for reducing nitrogen loading, ENVIR POLLU, 102, 1998, pp. 741-748
Citations number
19
Categorie Soggetti
Environment/Ecology
Journal title
ENVIRONMENTAL POLLUTION
ISSN journal
02697491 → ACNP
Volume
102
Year of publication
1998
Supplement
1
Pages
741 - 748
Database
ISI
SICI code
0269-7491(1998)102:<741:ASFRNL>2.0.ZU;2-C
Abstract
Two alternative strategies for reduction in nitrogen loading are analysed: (1) changes in agricultural production structure and (2) lake creation/rest oration. The former includes spatial redistribution of the agricultural pro duction, setting aside areas and changes in agricultural practice. The latt er includes five scenarios with different lake location and size. A 342 km( 2) agricultural watershed is used as study area. Two GIS-based models are a pplied: (1) a distributed riverine nitrogen loading model for analysis of a gricultural changes and (2) a linked-lumped model for lake creation analysi s. The analysis shows that each of the agricultural measures would result i n a 11-13% reduction. In combination they would amount to 30% reduction. Th e five lake scenarios were giving area specific reductions varying from 46 to 2375 kg N ha(-1) year(-1). The best lake creation strategy seems to be a high number of smaller lakes distributed in all parts of the watershed. Re sults indicate that comprehensive lake creation would result in a 20-30% re duction. The results emphasise the need for integrated watershed management .