韩江流域典型区叶塘组紫色岩上发育土壤理化性质研究

Study on the Physico-Chemical Properties of Soil Developed from Purple Sandstone(K2yt) in Typical Area of Hanjiang Valley

采用野外调查和室内实验分析相结合的方法,研究了韩江流域典型区梅江盆地白垩系上统叶塘组(K2yt)紫色岩发育的土壤理化性质特征。结果表明:叶塘组紫色岩发育的土壤砂粒含量高而粘粒含量低,容重较大,孔隙度、自然含水量偏低,pH呈弱酸性,钾素含量丰富,但有机质、氮素和磷素含量相对缺乏。K2yt发育的土壤理化性质随地形变化明显,从丘顶、丘腰到丘脚,土层逐渐增厚,土壤粘粒含量、容重和自然含水量逐渐递增,砂粒含量、孔隙度逐渐递减,土壤有机质及各种矿质养分含量均呈递增趋势。并提出了紫色土可持续利用的对策。

In this paper, by the method of combination of field investigation and indoor laboratory analysis, the physico-chemical properties of soil developed from purple sandstone （Kyt^2） in Meijiang Basin had been discussed. The results showed that the contents of the sand and clay was high and low, bulk density was high, porosity and natural moisture content were low, the soils was weak acid for ph value, the contents of K was high, organic matter, N and P contents were low, the physico-chemical properties of soil developed from Kyt^2 changed obviously with the terrain change, the soil layer thickened from the top of hillock, waist of hillock to foot of hillock, the soil clay content, bulk density and natural moisture content increased gradually, sand content, porosity decreased gradually, the soil organic matter and different mineral nutrient contents increased, the purple soil sustainable utilization countermeasures were raised.