武夷山土壤粒径分布特征及其可蚀性研究

为了更好地了解中亚热带山地土壤粒径分布及其可蚀性因子特征,以武夷山北段山脉为研究对象,选取土壤垂直带中6个代表性剖面,分析粒径分布规律,并结合有机碳分布特征,计算土样的可蚀性K值.结果表明:1)武夷山土壤质地以壤土和粘壤土为主,砂和粉砂相对含量随海拔升高大体呈上升趋势,粘粒含量则呈下降趋势;2)总体上,武夷山土壤可蚀性K值较小,但同一土壤剖面上B层的比A层的大,且土壤可蚀性因子K值随海拔呈先下降后上升的趋势,其值取决于质地和有机质含量.

Study on Particle Distribution and Erodibility in Mountain Soils of the Mountain Wuyi

In order to get a better understanding of the mountain soil particle distribution as well as the character of soil erodibility in the mid-subtropical temperature zone,this paper ana- lyzed the distribution of mountain soil particle and organic matter,and calculated soil erodiable K using the empirical formula with six representative soil profile at different altitudes based on the mountain soils of the north section of Wuyi Mountains. The results show： 1） Most types of the mountain soil are loam and clay loam. The relatively content of sand and silt tend to increase while the clay content tends to decrease as the altitude increases in the Mountain Wuyi. 2） On the whole, soil erodiable K of the mountain soil in the Mountain Wuyi is mainly small, however, the value in B-horizon is higher than that in A-horizon on the same section, and it tends to decrease first and then increase as the altitude increases, which mainly depends on the soil texture and con- tent of soil organic matter.