小流域氮磷流失风险评价——以沂沭河流域为例

Risk assessment of nitrogen and phosphorus loss in smallwatershed——— take the Yishu River as an example

调查沂沭河周边土壤中有机质、氮、磷等污染物的分布特征,分析氮磷流失的状况,评价氮磷流失风险。结果表明,沂沭河周边土壤TP、有机质的分布相似,在沂河上游土壤含量偏高,中游含量相对较高,下游含量略有增加;农田土壤的TN是林地中含量的2~3倍。氮磷流失风险评价的结果表明,氮磷流失综合风险在中度以上风险区占流域总面积的40%,主要集中在工业发达和农业发达的地区,工业发达地区的风险要高于农业发达地区。

This article investigated the distribution characteristics of organic matter,nitrogen,phosphorus and other pollutants in the soil around Yishu River,analyzed the situation of nitrogen and phosphorus loss,and evaluated the risk of nitrogen and phosphorus loss.The results show that the distribution of total phosphorus and organic matter in the surrounding soil is similar.The content of soil in the upper reaches of Yishu River is relatively high,the content in the middle reaches is relatively high,and the content in the lower reaches is slightly increased.The total nitrogen content of farmland soil is 2~3 times that of woodland farmland.The result of risk assessment of nitrogen and phosphorus loss shows that the comprehensive risk of nitrogen and phosphorus loss accounts for 40%of the total area of the river basin in the area with medium or above risk,which is mainly concentrated in the agricultural land with developed industry and high fertilizer input,and the risk of the area with developed industry is higher than that of farmland.