摘要
[目的]为控制农业非点源污染提供科学依据。[方法]在稻麦两熟种植制度下,研究了太湖地区爽水型、囊水型两种典型水稻土磷素地表径流流失状况和对磷的吸附特性。[结果]在常规施磷水平下,囊水型水稻土土壤磷素年径流流失量大于爽水型水稻土。2000~2001年度的地表径流磷流失量分别为603.2、679.5g/(hm^2·a),而在2001~2002年度时分别为1148.9、1350.3g(hm^2·a)。爽水型水稻土表层土壤磷的最大吸附量(Qm)和最大缓冲容量(MBC)分别为769.23mg/kg和130.00L/kg,均高于囊水型水稻土的Qm(666.67mg/kg)和MBC(66.00L/kg)。囊水型水稻土的PSI值低于爽水型水稻土,二者的PSI值均小于30。[结论]囊水型水稻土磷素更易流失。
[Objective] The study aimed to provide a scientific base to control the pollution of agricultural non-point sources. [Method] Under the double ripe planting system of rice and wheat, the state of P runoff losses and its absorption characters in two kinds of typical paddy soils (the permeable and waterlogged paddy soils) were studied. [Result] The yearly surface runoff P loss in waterlogged paddy soils was bigger than that in permeable paddy soils at the normal level of applying P, that was 603.2 and 679.5 g/(hm^2·a) resp. in 2000 - 2001 year and that was 1 148.9 and 1 350.3 g/(hm^2·a) in 2001 2002 year. The biggest adsorption quantity(Qm,769.23 mg/kg)and buffer capacity (MBC, 130.00 L/kg)of soil surface P in permeable paddy soils was higher than that in waterlogged paddy soils (Qm and MBC of 666.67 mg/kg and 66.00 L/kg resp. ). The PSI value of waterlogged paddy soils was lower than that of permeable paddy soils and their value were all lower than 30. [Conclusion] The P was more easier runoff in waterlogged paddy soils.
出处
《安徽农业科学》
CAS
北大核心
2008年第18期7788-7792,共5页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金资助项目(40171056
30471375)
国家重点基础研究项目(G1999011806)