Effect of Hedgerow on Anti-Erodibility of Sloping Farmlands Consisted of Purple Soil in the Hilly Area of Central Sichuan Basin
In the hilly area of central Sichuan basin,some sloping farmlands primarily consisted of purple soil have suffered serious water-soil erosion,inhibiting crop yield and income increase.Planting hedgerow is an effective ecological means of improving soil anti-erodibility.Good efforts to increase soil erosion resistance were made in the Loess Plateau of China,but less involved in revelation of corrosion-resistant mechanism of purple soil by planting hedgerows on sloping farmlands in Sichuan basin.In this study,it took Chrysopogon zizanioides and Leucaena glauca(L.)Benth in sloping farmlands of purple soil as research object.It collected long-term positioning observation data at Suining Soil and Water Conservation Test Station,Sichuan,China and field sampling;the principal component analysis method was used to comprehensively evaluate soil anti-erodibility of sloping farmland planted with different types of hedgerows.(1)It found that 11 indexes of soil anti-erodibility could be explained by two principal components,with a contribution rate of up to 82.7％.The water-stable aggregate could be used as the best index to measure soil corrosion resistance.(2)Hedgerows significantly improved anti-erodibility of surface soil.Supposing sample plots without hedgerow as a control group,on a sloping farmland of 10°,soil anti-erodibility index obtained from the Chrysopogon zizanioides hedgerow plot and the Leucaena glauca(L.)Benth hedgerow plot was 7.0 and 2.3 times higher than that of the control plot,respectively;on the 15°sloping farmland,the soil anti-erodibility index for the Chrysopogon zizanioides hedgerow plot was 26.7 times than that of the control plot.The soil anti-erodibility on the downside of a hedgerow was higher than that on the upside.On the sloping farmland of 10° and 15°,the soil anti-erodibility on the downside was 2.0 and 1.5 times higher than that on the upside,respectively;and for Leucaena glauca(L.)Benth hedgerow,its value on the downside was 1.1 times higher that on the upside on the 10° sloping farmland.(3)Generally,the soil anti-erodibility on the Chrysopogon zizanioides hedgerow plot was higher than that of the Leucaena glauca(L.)Benth hedgerow plot,and index value examined on the downside was higher than those on the upsides.This study revealed that the selection of a suitable hedgerow type and preservation of the surface soil on the upside of hedgerow could effectively reduce soil-water loss in sloping farmland,which would provide a scientific guide to soil erosion control for agricultural yield increase in the hilly area of central Sichuan basin.
万方数据
维普
