川中丘陵区城墙岩群和蓬莱镇组紫色岩上土壤性质研究

采用野外调查、取样和室内实验分析相结合的方法,研究了川中丘陵区白垩系城墙岩群(K1cg)和侏罗系蓬莱镇组(J3p)两种紫色母岩上土壤理化性质特征和差异,结果表明:两种紫色岩母质发育的土壤粘粒含量低,而砂粒含量高;土壤有机质和氮素含量低,而矿质养分含量丰富;在相同的地形部位上,J3p发育的土壤粘粒、全钾、速效钾和速效磷含量高于K1cg发育的土壤,而K1cg发育的土壤pH和土壤全磷均高于J3p发育的土壤,两种紫色岩母质形成的土壤有机质和氮素差异不明显。从丘顶到丘脚,土层逐渐增厚,土壤粘粒含量逐渐递增,砂粒含量逐渐递减;土壤有机质及各种矿质养分含量均呈递增趋势。

The Soil Properties of Soils Developed from K1cg and J3p in Central Hill Region of Sichuan Basin

In this paper,by the method of soil sampling and laboratory analysis,the differences of soil properties between the soils developed from K1cg and J3p In central hill region of Sichuan basin have been discussed.The results showed that the contents of the clay,organic matter,total N and Available N were lower in soils developed from K1cg and J3p,but the contents of the sand,P and K were fruitful.Under the same slop position,the pH and total P in the soils developed from K1cg were higher than in the soils developed from J3p,and the clay,total K,available K and available P in the soils developed from J3p were higher than in the soils developed from K1cg.The content of clay,organic matter and all kinds of nutrients in soil developed from K1cg and J3p were increased from hilltop to hill foot