紫色土丘陵区不同土地利用类型土壤抗冲性特征研究

对紫色土丘陵区不同土地利用类型土壤抗冲性特征及其主要影响因素进行研究，结果表明：（1）径流含沙量在土壤冲刷过程中总体呈递减趋势。但传统农耕地7～10min后径流含沙量有增大趋势，径流含沙量表现为传统农耕地（0.81g／L）〉农林混作型耕地（0.73g／L）〉园地（0.69g／L）〉竹林地（0.58g／L）；（2）在整个冲刷过程中，随着时间增加，土壤抗冲指数逐渐增大，竹林地抗冲性能最强，园地和农林混作型耕地抗冲性能较为接近，抗冲性能最弱的为传统农耕地；（3）土壤抗冲指数依次为竹林地（1．37min／g）〉园地（0.99min／g）〉农林混作型耕地（0.92min／g）〉传统农耕地（0．70min／g），竹林地、园地、农林混作型耕地的抗冲指数分别是传统农耕地的1．96，1．41，1．31倍；（4）根系对紫色土的保护作用明显，抗冲性的增强效应依次为竹林地〉园地〉农林混作型耕地〉传统农耕地。

Study on Soil Anti-Scourability of Different Land Use Types in Purle Soil Hilly Region

The characteristics of soil anti-scourability and its primary influence factor in different land use types of Purple soil hilly region were studied.(1)The results showed that the sediment concentration had a decreasing trend during the process of scouring,but the traditional farmland's had a increasing trend from 7 to 10 minute.The sediment concentration were traditional farmland(0.81 g/L)>tree-crop intercropping land(0.73 g/L)> orchard(0.69 g/L)>bamboo forest land(0.58 g/L);(2)During the scouring process,the index of soil anti-scourability increased gradually along with the time,and the order of soil anti-scourability is that the maximal is bamboo forest land,orchard and tree-crop intercropping land were secondary,and the minimal is traditional farmland;(3)The index of soil anti-scourability were bamboo forest land(1.37 min/g)> orchard(0.99 min/g)> tree-crop intercropping land(0.92 min/g)> traditional farmland(0.70 min/g),and the index of soil anti-scourability of bamboo forest land,orchard and tree-crop intercropping land is respective 1.96,1.41 and 1.31 times as traditional farmland;(4)Root system had obvious enhancement effects on Purple soil antiscourability,and the intensified values of soil anti-scourability by root system were bamboo forest land> orchard> tree-crop intercropping land> traditional farmland.