View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Elsevier - Publisher Connector Water Science and Engineering, 2014, 7(4): 373-383 doi:10.3882/j.issn.1674-2370.2014.04.003 http://www.waterjournal.cn e-mail:
[email protected] Impact of nutrient losses from agricultural lands on nutrient stocks in Dianshan Lake in Shanghai, China Shou-bing WANG1, Xiao-xue MA1, Zheng-qiu FAN1, Wei-qian ZHANG1, Xiao-yong QIAN*1, 2 1. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, P. R. China 2. Shanghai Academy of Environmental Sciences, Shanghai 200233, P. R. China Abstract: The water quality of Dianshan Lake in Shanghai Municipality, China, is impacted by nutrient losses from agricultural lands around the lake. In this study, nine types of agricultural land use were monitored in 2010 and 2011, and a correlation analysis between nutrient losses from agricultural non-point sources (NPS) and nutrient stocks in the lake was conducted over monthly and seasonal time periods. The results indicate that the monthly average concentration of total nitrogen (TN) ranged from 1.41 to 7.34 mg/L in 2010 and from 1.52 to 5.90 mg/L in 2011, while the monthly average concentration of total phosphorous (TP) ranged from 0.11 to 0.26 mg/L in 2010 and from 0.13 to 0.30 mg/L in 2011. The annual loss of TN from agricultural NPS was 195.55 tons in 2010 and 208.40 tons in 2011. The cultivation of water oat made the largest contribution to the loss of TN.