中文摘要：

为了研究预测不同施磷肥剂量引起农业磷面源污染的可能性，通过对河北栾城农业生态站潮褐土和吉林白城地区盐碱性土壤各个处理土样均施用不同剂量磷肥，测定两种土壤中Olsen-P和CaCl2-P含量随着时间变化的趋势。利用Heckrath分段回归模型，分别对培养60d后栾城和白城土壤Olsen-P，CaCl2-P含量进行拟合，得到栾城和白城土壤环境敏感磷临界点对应的土壤Olsen-P含量分别为100．73mg／L和163．42mg／L。

英文摘要：

In order to research and forecast the possibility of agricultural area source pollution caused by employing different doses of phosphate fertilizer, a test was conducted to employ different doses of phosphate fertilizer into each soil sample which was taken from Agricultural and Ecological station in Luancheng county in Hebei Province and Baicheng area in Jilin province, and the changing trend of Olsen-P and CaCl2-P contents with time in two kinds of soil was measured. By using Heckrath split-line model, the Olsen-P and CaCl2-P contents in the soil cultured for 60 days in Luancheng county and Baicheng were fitted, and the environmental sensitive threshold for phosphorus were obtained which were 100.73 mg/L and 163.42 mg/L Olsen-P respectively.