松华坝库区土壤氮磷累积特征与流失风险研究

分析了松华坝水库库区土壤的N,P累积特征。结果表明,(1)整个库区土壤(0—20 cm)全氮含量平均值为1.79 g/kg;NH4—N含量平均值为13.55 mg/kg;NO3—N含量平均值为7.29 mg/kg。全氮含量依次为:粮田>果园>菜地;NH4—N含量依次为:果园>粮田>菜地;NO3—N含量依次为:果园>菜地>粮田。(2)整个库区土壤(0—20 cm)全磷平均值为1.60 g/kg;速效磷含量平均值为10.36 mg/kg。全磷含量依次为:粮田>果园>菜地;速效磷含量依次为:菜地>粮田>果园。(3)入库河流的全N含量最初为Ⅱ类水,但是在入库口全N含量为Ⅴ类水。入库河流的全P含量最初为Ⅱ类水,全P含量最高为Ⅲ类水,入库口水质全P下降为Ⅲ类水。

Characteristics of Soil N and P Accumulation and Their Loss Risk in Songhuaba Reservoir

The N and P accumulation characteristics of soil in Songhuaba Reservoir are studied.Results show that the average content of total N of soil(0-20 cm) in the whole reservoir is 1.79 g/kg;NH₄-N,13.55 mg/kg;and NO₃-N,7.29 mg/kg.Landuses ranked from the high content of total N to the low are in turn the agricultural land,fruit land and vegetable land;NH₄-N,in turn the fruit land,agricultural land and vegetable land;and NO3-N,in turn the fruit land,vegetable land and agricultural land.The average content of total P of soil(0-20 cm)is 1.60 g/kg,and available phosphate,10.36 mg/kg.Landuses ranked from the high content of total P to the low are in turn the agricultural land,fruit land and vegetable land;available phosphate,in turn the vegetable land,agricultural land and fruit land.The content of total N in the rivers entering the reservoir is in the 2nd grade,but falls into the 5th grade near the reservoir.The content of total P of the rivers is in the 2nd grade,and the highest content of total P is in the 3rd grade.However,the water quality falls into the 3rd grade near the reservoir.