紫鹊界梯田区不同土地利用类型土壤入渗特征研究

采用压力仪和盘式入渗仪测定了紫鹊界梯田区域不同土地利用类型土壤的水分入渗特征并应用多种计算理论推算其水分运移参数。结果表明,林地和退耕地土壤持水能力比旱田和水田强,在相同吸力条件下林地和退耕地的含水率平均比旱田和水田分别高28%和55%;不同土地利用类型对土壤水分累积入渗量、土壤吸渗率和导水率有着较大的影响,其值均按照林地、退耕地、水田、旱地的顺序依次增大;研究结果初步揭示了紫鹊界土地利用类型对梯田区土壤水分运移机理影响。

Effect of Land Use Types on Infiltration Characteristics in the Ziquejie Terraces Region

Application of a disc permeameter and a pressure plate extractor on the sloping surface of the terraces under different land use types in Ziquejie region was conducted to measure the infiltration characteristics and to analyse the hydraulic parameters by using different methods.The results showed that the soil water retention capacity in the woodland and abandoned land was higher than that in the dry land and paddy field.Under same suction conditions,the soil water content in the woodland and abandoned land compared with the dry land and paddy field increased by 28%,55%,respectively.The land use types had significant influence on the amount of cumulative infiltration,soil sorptivity and hydraulic conductivity,and the sequence of sorptivity and hydraulic conductivity rates for the different land use types was woodland,abandoned land,paddy fields,dry land.