磷在红壤肥际微域中的迁移和转化  

Movement and Transformation of Phosphorus in Fertilizer Microsites in Red Soil

作　　者：杜振宇[1] 周健民[1] 

机构地区：[1]土壤与农业可持续发展国家重点实验室中国科学院南京土壤研究所

出　　处：《水土保持学报》2005年第3期1-4,41,共5页Journal of Soil and Water Conservation

基　　金：国家自然科学基金(40071051);国家重点基础研究发展计划(G1999011802)资助

摘　　要：采用室内土柱实验研究了磷在红壤肥际微域中的迁移和形态转化。结果表明,相同施量的磷在7天和28天时的迁移距离相同,施用磷酸二氢钙(MCP)0 2g和0 5g时的迁移距离分别为1 4cm和2 0cm。磷在施肥7天内的迁移量较大,然后只发生少量迁移。迁移进入土壤的磷86 3%～94 2%被吸附固定,64 1%～72 2%仍以有效态存在。在迁移距离内,土壤水溶性磷、酸溶性磷和有效磷含量与距施肥点距离呈极显著直线负相关。施肥量对水溶性磷、酸溶性磷和有效磷在肥际微域中的含量分布有显著影响;但培养时间只对水溶性磷含量分布有显著影响。In this paper, the movement and transformation of phosphorus (P) in fertilizer microsites in red soil were studied by an incubation experiment using soil column. The movement distances of added P were the same at both 7 day and 28 day, 1.4 cm for MCP 0.2 g and 2.0 cm for MCP 0.5g. Most of P moved into soil was absorbed but still in available form in fertilizer microsites. The concentrations of water-extractable P, acid-extractable P and available P have significant negative linear relationships with distance from fertilizer placement in the region of P movement. The amount of P application has significant effects on the concentration distributions of water-extractable P, acid-extractable P and available P in fertilizer microsites. However, incubation time has significant effect on only water-extractable P.

关 键 词：磷 红壤 肥际微域 迁移 转化 

分 类 号：S153.3[农业科学—土壤学]