Reductions in non-point source pollution through di erentmanagement practices for an agricultural watershedin the Three Gorges Reservoir Area
Yaowu Tian , Zhilin Huang , Wenfa Xiao
DOI:
Received April 17, 2009,Revised August 27, 2009, Accepted , Available online
Volume 22,2010,Pages 184-191
- Summary
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Non-point source water pollution generated by agricultural production is considered a major environmental issue in the Three Gorges
Reservoir Area (TGRA) of China. The Annualised Agricultural Non-Point Source Pollution (AnnAGNPS) model was selected to assess
the impact of the application of various management treats, including seven crops, five fertilizer levels and three-group management
practice scenarios, on water quality from Heigou River Watershed in TGRA. The scenario subsets include conservation tillage practice
(CTP), conservation reserve program (CRP) and conversion of cropland into forestland program (CCFP). Results indicated that tea can
not be replaced by other crops because comparatively tea resulted in a higher sediment yield. CTP with no-tillage was more e ective
to reduce sediment yield, but could increased nutrient loss. CRP reduced sediment yield significantly, but slightly benefited on nutrient
loss. CCFP reduced not only sediment yield but also the nutrient loss significantly. The conversion of cropland with a slope greater than
10 into forestland was found to be the best scenario as the sediment yield export is less than 5 tons/ha and nutrient loss is within the
permissible limit.
