豫西南环境变迁与土壤发生的研究

本文以豫西南的三个土壤剖面为对象，研究了土壤的形态、理化和矿物学特性，探索环境与土壤发生的关系．结果表明：发育在中更新世母质上的红粘土与毗邻区域的地带性土壤相比，具有较低的粘粒硅铝率、较小的风化淋溶系数和较高的游离氧化铁，既属于古环境景观影响下的产物，但又表现出有一定的复钙作用和较高的ＰＨ值．这些特性说明此种古土壤出露地表后，虽保留其残遗特征，却又进行着与现代生物气候条件相谐调的过程．

ENVIRONMENTAL CHANGES AND PEDOGENESIS IN SOUTHWEST HENAN

Based on three soil profiles in the Southwest Henan, the soil morphology, physical chemistry and mineralogical properties are studied, and the relationship between environment and pedogenesis is probed in this paper. The results showed that,the red clay developed from the parent material of the Middle Pleistocene is characterized with lower silica-alumina ratio and weathering-leaching coefficient and with highercontent of free iron oxide, compared with the zonal soils in the contiguous regions. Itnot only belongs to the outcome of the paleo-environmental landscape, but also has acertain extent of recalcification and higher PH value. These characteristics elucidate thatafter exposing on the land surface, this paleosol is in the process that is in harmony withthe modern bioclimatic conditions, although it retains the remaining features.