Study on phosphorus concentrations in runoff from paddy soils of rice-wheat double cropping system in Taihu Lake region
ZHANG Hong-ai1,2, ZHANG Huan-chao2, ZHONG Ping3
1. Academy of Forestry Survey and planning of Guandong Province, Guangzhou 510520, China; 2. Nanjing Forestry University, Nanjing 210037, China; 3. Institute of Hydrobiology, Jinan University, Guangzhou 510632, China
Little is known about the exact amount of phosphorus(P) loss per year from the paddy soils in Taihu Lake region and the contribution of this P loss to the eutrophication of Taihu Lake among all kinds of non-point sources.A field plot experiment was conducted to investigate the changes of P concentrations in runoff and the reasons responsible for these changes on two types of paddy soils,the permeable paddy soil in Anzhen site and the waterlogged paddy soil in Changshu site in the Taihu Lake Region from June 2000 to June 2002.The results showed that particulate P was the dominant portion in runoff and P fertilization had a significantly effect on the P concentrations in runoff.Phosphorus concentration in runoff for each treatment seemed to decrease from the first runoff event to the last event both in rice growing seasons and wheat growing season.Beside,the greatest potential risk of P loss by runoff might occur in one month in rice growing season and one or two months in wheat growing season after P fertilization.P concentrations in runoff from the waterlogged paddy soil were greater than those from the permeable paddy soil if the runoff events occurred at the same period.It was also observed that the paddy soil type had an obvious effect on the number of runoff event.
张红爱1,2, 张焕朝2, 钟萍3. 太湖地区典型水稻土稻-麦轮作地表径流中磷的变动规律[J]. , 2008, 27(1): 17-23.
ZHANG Hong-ai1,2, ZHANG Huan-chao2, ZHONG Ping3. Study on phosphorus concentrations in runoff from paddy soils of rice-wheat double cropping system in Taihu Lake region. , 2008, 27(1): 17-23.
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