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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 characteristics and differences of soil physical and chemical properties on the two purple parent rocks of the Cretaceous wall rock group (K1cg) in the central Sichuan hilly region and the J3p reservoir in the Jurassic are studied by field survey, sampling and laboratory experimental analysis. Results The results show that the content of soil clay is low and the sand content is high in both purple rock parent materials. The content of soil organic matter and nitrogen is low, while the content of mineral nutrient is rich. On the same topographical site, the soil clay, J , Available potassium and available phosphorus were higher than that of K1cg. Soil pH and soil total phosphorus in K1cg were higher than that in J3p. There was no significant difference in soil organic matter and nitrogen between the two purple rock parent materials. From the hilltop to the mound foot, the soil layer gradually thickens, the soil clay content gradually increases, and the sand content decreases gradually. The contents of soil organic matter and various mineral nutrients show an increasing trend.