Accumulation and Leaching Risk of Soil Phosphorus in Lei Bamboo Stands in the Upper Reaches of Taihu Lake
Phosphorus accumulation and losses were measured in the soils in Lei bamboo (Phyllostachys praecox) stands located in the upper reaches of Taihu Lake to determine evolution trend of soil P and its leaching risk.The contents of total P (TP) and available P (AP) in the soils increased with time or cultivation ages and decline with soil depth.Average annual rate of P accretion in 0-25 cm plow layer during 1999-2010 were 102 kg ha-1yr-1.Rates of P accretion in 0-20,20-40,40-60 and 60-80 cm soil depth with 15 year-cultivation history were 135,65,40 and 20 kg ha-1yr-1,respectively.The average contents of AP in the soils decreased in the order: Lei bamboo stand (652 mg kg-1) > vegetable land (386 mg kg-1) > Lei bamboo stand and Masson pine stands (6.1-6.6 mg kg-1).Total P leaching loads via infiltration and runoff water in the treatments applied P ranged from 4.32 to 7.77 kg ha-1,which accounted for 5.3 to 7.5% of total P rates applied.Application of median P + pig manure,median P and phosphate rock decreased TP leaching loads by 15.4,36.2 and 44.4%,respectively,as compared to the high P treatment.It is concluded that Lei bamboo stands have become important agricultural nonpoint source pollution in the upper reaches of Taihu Lake.
Environmental risks Lei bamboo (Phyllostachys praecox) Phosphorus accumulation P leaching load and upper reaches of Taihu Lake
Penkun Jiang Cifu Meng Jiasen Wu Wen Chen Kaiping Xu Qiufang Xu
School of Environmental and Resource Sciences,Zhejiang A and F University,Lin”an,China
国内会议
浙江丽水
英文
302-311
2014-10-28（万方平台首次上网日期，不代表论文的发表时间）