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磷在红壤肥际微域中的迁移和转化
引用本文:杜振宇 周健民. 磷在红壤肥际微域中的迁移和转化[J]. 水土保持学报, 2005, 19(3): 1-4,41
作者姓名:杜振宇 周健民
作者单位: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,南京,210008;山东省林业科学研究院,济南,250014
2. 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,南京,210008
基金项目: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。

关 键 词:  红壤  肥际微域  迁移  转化
文章编号:1009-2242(2005)03-0001-04

Movement and Transformation of Phosphorus in Fertilizer Microsites in Red Soil
DU Zhen-yu~. Movement and Transformation of Phosphorus in Fertilizer Microsites in Red Soil[J]. Journal of Soil and Water Conservation, 2005, 19(3): 1-4,41
Authors:DU Zhen-yu~
Affiliation:DU Zhen-yu~
Abstract: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.
Keywords:phosphorus  red soil  fertilizer microsite  movement  transformation
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