种植苎麻对南方坡耕地土壤抗蚀性的影响

基于时空互换法,采用野外典型区域调查和室内分析相结合的方法,分析了南方4省(江西、湖南、四川、湖北)不同苎麻种植年限坡耕地土壤抗蚀性的变化特征。结果表明:(1)0.25mm水稳性团聚体含量,结构体破坏率,0.5mm水稳性团聚体含量可以作为评价南方种植苎麻坡耕地土壤抗蚀性能的指标;(2)种植苎麻增加了土壤中2mm和0.25mm水稳性团聚体的含量,降低了土壤中2mm和0.25mm团聚体的破坏率,且其效果随着苎麻种植年限的增加而增强。种植苎麻对增加2mm团聚体的含量及降低其破坏率的作用尤为突出;(3)所选择的4个研究区中,以四川省达州地区种植苎麻提高坡耕地土壤抗蚀性的效果最为突出,其次是湖北省咸宁市。

Effect of Ranmie Plantation on Soil Anti-erodibility in Slope Land of Southern China

Based on space for time methods, the characteristic of soil anti-erodibility in four provinces(Jiangxi, Hunan, Sichuan, Hubei) planted with ramie for different years in slope land of Southern China were studied. The results showed that:(1) With principal component analysis, the content of >0.25 mm, >0.5 mm water stable aggregate composition and rate of structure deterioration could be used to indicate the soil anti-erodibility of different slope land planted with ramie;(2) Planting ramie could increase the content of >2 mm and >0.25 mm water stable aggregate composition, while decrease its structure deterioration rate, and the effects increased with planting time. For content and rate of structure deterioration of >2 mm aggregate, the effects are striking;(3) In the four study areas, planting ramie improved soil anti-erodibility most in Dazhou, Sichuan Province, followed by Xianning, Hubei Province.