Nutrient Discharges from a Typical Watershed in the Hilly Area of Subtropical ChinaEnglish Full Text

ZHANG GANLIN, YANG JINLING and ZHAO YUGUOInstitute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China)

Abstract: Agriculture is still the biggest contributor of non-point source （NPS） pollution to water bodies and runoff discharges of nutrients and other chemicals are one of the most important pathways. This study was conducted during 1998-1999 in a typical watershed with complex agriculture and forestry systems as well as dotted farmer villages, in a transitional region between the mid- and northern subtropical zones of China. Continuous sampling of stream water was performed regularly at a weekly frequency, with additional sampling after all major rainfall events. The discharges of N and P nutrients and suspended materials were measured and the total and area-averaged annual discharges of all components were calculated. The results showed an uneven seasonal distribution of nutrient discharges with summer storms contributing most to the total fluxes. This study demonstrated a high dependence of runoff volume on rainfall but the overall runoff coefficients were dependent on land use type and watershed size. The area-averaged annual discharges varied greatly among the sub-watersheds with different sizes and land use structures. This is the first study estimating the area-averaged annual discharges of N and P in the hilly areas of subtropical China, which were 1.5 g m-2 a-1 and 0.1 g m-2 a-1, respectively, providing important reference values for the assessment of regional agricultural non-point source pollution.

Keywords：

discharge; nutrients; runoff; subtropical China; watershed;

Series：
(B) Chemistry/ Metallurgy/ Environment/ Mine Industry; (D) Agriculture
Subject：
Environment Science and Resources Utilization
Classification Code：
X52

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Nutrient Discharges from a Typical Watershed in the Hilly Area of Subtropical ChinaEnglish Full Text

ZHANG GANLIN, YANG JINLING and ZHAO YUGUOInstitute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China)

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