元阳梯田区不同土地利用类型表层土壤抗蚀性研究

The anti-erodibility of surface soil of the different land use types in the terrace area of Yuanyang

为了研究云南元阳梯田区土壤的侵蚀特性,得到适合该地区的土壤侵蚀评价指标,采用常规方法对元阳梯田区有林地、灌木林地、荒草地和坡耕地0—10 cm土壤层的团聚状况、根系含量、有机质含量、3—2 mm的土壤结构稳定度、土块分散程度等进行测定。结果表明:元阳梯田区0—10 cm层的土壤均具有良好的团聚状况,3—2 mm的土壤结构稳定度均在80%以上;4种土地利用类型以荒草地的抗蚀性最好,灌木林地次之,再次为有林地,坡耕地最差;>3 mm的土壤团聚体含量、3—2 mm的土壤结构水稳度、<0.05 mm的土壤分散率、土壤的团聚状况、植物根系含量5个指标可以较全面地反映出元阳梯田区土壤的抗性能。

On the basis of conventional method with the aggregation status of soil, root content, organic matter, water-stable aggregates content of 3-2 mm, soil dispersion rate of 0-10 cm soil layer of woodland, shrub land, waste grassland and slope farm land were studied in area of Yuanyang County with the purpose of studying the soil erosion characteristics and getting the evaluation indexes suitable for the area.The results showed that the 0-10 cm soil layer of Yuanyang all possessed good aggregation status and the water-stable aggregates contents of 3-2 mm were more than 80%. The anti-erodibility of 0-10 cm soil of waste grassland was the best, followed by shrub land, forest land and slope farm land. The content of soil aggregates of 〉3 mm, water-stable aggregates content of 3-2 mm, soil dispersion rate of 〈0.05 mm, aggregation status of soil and root content t could comprehensively reflect the anti-erodibility of soil in Yuanyang County.