前 言 土地是各自然要素相互作用而形成的自然综合体,由于各种要素数量的不同和彼此结合形式的差异,就形成一系列互相区别各具特色的土地,这些土地个体的划分就是土地类型。信阳地区土地类型的研究及其1:20万土地类型图的编制,是在近三年来实地野外考察的基础上,结合卫星照片和航空相片,并参考该区的土壤图和地质地貌图,在1:5万地形图上填绘编制而成的。对本区土地类型的形成特点和地理分布规律以及当 Preface Land is a natural complex formed by the interaction of natural elements. Due to the differences in the number of elements and the differences between each other, land forms a series of distinctive land. The division of land individuals is land type. The research on the land types and the 1: 200000 land type maps in Xinyang area is based on the field investigation in the past three years. Combining the satellite photos and aerial photos with reference to the soil map and the geological map of the area, 1: 50000 topographic map prepared by the drawing. On the formation of land types in this area characteristics and geographical distribution patterns and when