水土保持措施对黑土流失区土壤理化性质的影响

针对黑龙江省东南部黑土区坡耕地所采取的4种水土保持措施的土壤进行了理化性质研究,分析了不同水土保持措施之间的差异.结果表明:0～50 cm黑土层有机质平均质量分数排序为植物篱＞谷坊＞退耕还林＞退耕还草,植物篱有机质质量分数115.66 g/kg,而退耕还草为69.43 g/kg;非毛管孔隙大小排序为植物篱(10.56％...

Effect of Soil and Water Conservation Measures on Physical and Chemical Properties of Black Soil Erosion Area

A study was conducted to explore the difference of various soil and water conservation measures by measuring soil physical and chemical properties of slope farmland under four soil and water conservation measures in Muling County of Mudanjiang,Heilongjiang Province.Results indicated that the average organic content of hedgerow(115.66g/kg) in the 0-50cm soil layer was the highest,followed by check dam,removal lands from cultivation to afforestation,removal lands from cultivation to grassland(69.43g/kg).The non-capillary porosity of soil ranked as hedgerow(10.56%),removal lands from cultivation to afforestation(7.70%),check dam(5.82%) and removal lands from cultivation to grassland(2.14%) in high-to-low order.Hedgerow ameliorated the soil physical and chemical properties most obviously.Compared with the farmland,the soil density of hedgerow in the 0-50cm soil layer reduced by 18.99%;the maximum water capacity,capillary water capacity and minimum water capacity increased by 11.93%,9.37% and 15.31%,respectively.The effective phosphorus content in hedgerow was 93.11mg/kg,and hydrolyzed nitrogen content was similar to that of the farmland.Check dam could effectively intercept the surface soil eroded from the upstream region,and the capillary water capacity and minimum water capacity in the 0-50cm soil layer were 16.90% and 12.14% higher than that of the farmland respectively.The removal lands from cultivation to afforestation exhibited a higher capability of soil improvement than removal lands from cultivation to grassland due to its higher contents of soil organic,effective phosphorus and available potassium as well as lower contents of total nitrogen and hydrolysis nitrogen.