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小赤田小流域是云南省昌宁县坡耕地水土流失综合治理试点工程实施项目区,该项目土壤环境质量监测以土壤理化性质监测为重点,并对项目区土壤重金属进行普查。通过测定土壤理化性质,对比分析项目区土壤理化性质变化,以及土壤保水、保肥的变化情况。坡耕地土壤2011年评价结果为:(1)土壤板结紧实,毛管孔隙和无效孔隙所占比重大,透水性能差,大雨时雨水不能迅速渗入下层,土壤接纳的水分少,地表径流增加,土壤冲刷侵蚀严重。(2)试验区水解氮和全磷含量较低,有效磷极度缺乏;有机质含量局部偏低。(3)土壤局部出现汞轻度污染,原因不详。
Xiao-tiantian small watershed is the project area for implementing pilot projects of soil and water erosion control in Changning County, Yunnan Province. The monitoring of soil environmental quality focuses on the monitoring of soil physical and chemical properties, and the soil heavy metals in the project area are surveyed. Through the determination of soil physical and chemical properties, comparative analysis of changes in soil physical and chemical properties of the project area, as well as soil water, fertilizer changes. The evaluation results of soil in sloping farmland in 2011 are as follows: (1) The compaction of soil is tight, capillary pores and ineffective pores account for a large proportion, and the water permeability is poor. Rainwater can not rapidly infiltrate into the lower layer under heavy rain, and the soil receives less moisture and surface runoff increases. Erosion erosion serious. (2) The content of hydrolyzed nitrogen and total phosphorus in the experimental area is low, and the available phosphorus is extremely scarce; the organic matter content is locally low. (3) Mild mercury in soil partially appears, the reason is unknown.