缓坡耕地土壤磷素释放的动态规律研究  

The Dynamic Pattern of Soil Phosphorus Release from Gentle Slope Land

作　　者：崔力拓[1] 李志伟[2] 

机构地区：[1]中国环境管理干部学院,河北秦皇岛066004 [2]河北农业大学海洋学院,河北秦皇岛066003

出　　处：《土壤通报》2007年第4期697-700,共4页Chinese Journal of Soil Science

基　　金：河北省教育厅自然科学计划项目(Z2005112);中国环境管理干部学院基金项目(2005-002)

摘　　要：研究坡耕地土壤磷素的释放规律有助于非点源污染的控制。在秦皇岛洋河流域缓坡耕地进行的试验表明:随着磷肥施用量的增加,坡耕地释放磷素的数量也相应的提高,在施磷量超过P2O5450 kg hm-2时,径流中正磷酸态P(Ortho-P)的含量会对水体产生明显影响;同时坡耕地土壤释磷的规律与玉米生长发育规律有显著关系,表现为:随着玉米由苗期→营养生长盛期→抽穗期→结实期,地表径流中Ortho-P的含量变化依次为:高→低→高→低。Soil phosphorus release from gentle slope contributes to non-point pollution. Experiments at gentle slope field of the Yanghe watershed showed that the quantity of phosphorus release correspondingly increased with the increase of applying phosphorus fertilizers. The quantity of Ortho-P in runoff had an influence on water environment when the quantity of applying phosphorus fertilizers over 450 kg P2O5hm^-2. The law of soil phosphorus release from gentle slope land had a remarkable effect on corn growth.

关 键 词：磷素 释放 动态规律 坡耕地 

分 类 号：X14[环境科学与工程—环境科学]