太湖地区土壤中氮和速效磷的空间变异  

Spatial Variation of Nitrogen and Available Phosphorus in Soil of Taihu Lake Region

作　　者：朱红霞[1,2] 陈效民[1] 方堃[1] 庾亮[1] 

机构地区：[1]南京农业大学资源与环境科学学院,江苏南京210095 [2]南京信息工程大学,江苏南京210044

出　　处：《江苏农业学报》2008年第6期839-842,共4页Jiangsu Journal of Agricultural Sciences

基　　金：国家自然科学基金项目(40371055)

摘　　要：对太湖地区2种主要水稻土类型白土和乌栅土在土壤剖面中氮素和速效磷含量的空间变异进行了研究。结果显示：NH_4^＋ -N在土壤剖面中的空间变异为从土壤上层到下层呈逐渐递减趋势，以表土层含量为最高，表层以下基本上趋于稳定；硝态氮含量随土层深度的加深呈现逐渐降低的趋势。速效磷的空间变异不如NH_4^＋ -N明显，白土中速效磷呈由表层随土层深度的增加而增加，在12～20cm土层达到最大，接着又随土层深度的增加而降低，乌栅土基本呈逐渐下降的趋势；2种土壤中pH值变化不大，但均呈升高趋势。Spatial variation of nitrogen and available phosphorous in soil profiles of farmland soil （ two main paddy soils,Whitish soil and Wushan soil）. The results were as follows. The NH_4^＋ -N and NO_3^＋ -N contents in soil profiles gradually decreased from surface soil layer to bottom soil layer. NH_4^＋ -N content was keep stable below surface soil. The available phosphorus was accumulated more as the Whitish soil,went deeper,and reached the maximum content. 12 -20 cm betow surface soil. However, the available phosphorus declined as the Wushan soil went deeper, pH value showed little difference in two soils in which it became more and more.

关 键 词：太湖地区 农田土壤 空间变异 

分 类 号：S153.61[农业科学—土壤学]