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KEYWORD: Saturated hydraulic conductivity, Land use, Horqin Sand Land ABSTRACT: In order to analyze the influence of land use on soil saturated hydraulic conductivity (Kfs), three typical sandy lands of Horqin Sand Land were chosen, including pine woodland, poplar woodland and farmland, and three fields for each type to identified for Kfs measurement. The Kfs of five soil depths (0~20cm, 20~40 cm, 40~60cm, 60~80cm and 80~100cm) at each field was measured in situ by Guelph Permeameter. The relationship of Kfs with sand types, soil depths, and soil physiochemical properties were analyzed. The results showed that (1) The averaged Kfs was decreased in the order: pine woodland > poplar woodland > farmland, with averaged value was 3.99,2.60 and 0.93 mm/min, that was, Kfs of Horqin Sand Land was largely influenced by land use. (2) The trend in Kfs with increasing soil depth was not consistent among the type of sand land, e.g., the changes of Kfs along with soil depth in pine woodland was fitted by parabola model, but there was no law for poplar woodland and farmland. (3) The relationships of Kfs and soil physiochemical property revealed that soil organic matter content and mechanical components were the key factors affecting Kfs of Horqin Sand Land, next was soil bulk density, and Kfs increased with increasing coarse sand fraction (2~0.1 mm) and bulk density, but Kfs decreased with increasing soil clay and silt content proportion (that was 0.1~0.05mm and <0.05mm, respectively), and organic matter content.

Effects of land use on soil saturated hydraulic conductivity of Horqin Sand Land