摘要
土地资源是农业自然资源的一个重要组成部分,是自然和社会的综合体。它既受到地理各要素如气象、土壤、地貌、植被、岩石、水文等的影响和作用,同时具有人类可开发利用的特征。土地资源的自然特性不仅影响着农业生产的水平,而且在很大程度上制约着土地利用的方向。我国黄土高原水土流失面积约43万Km^2(其中严重流失的面积为28万km^2),占全国水土流失面积的28.07％,占黄土高原面积的74％。这里约有50％的地区年土壤侵蚀模数超过5000t/km^2,最严重的地区达2～3万t/km^2。严重的水土流失导致土地肥力下降,耕地面积减少,而造成严重水土流失的关键在于土地利用不合理。为了合理利用土地,减少土壤侵蚀,改善目前的生态环境,必须对土地资源作出合理的评价。土地资源评价,对于制定水土保持与土地利用规划、减少土壤侵蚀、充分利用土地资源并发挥其生产潜力、确定合理的农业生产结构。
Based on the five land property indexes slope, soil classification,geomorphology , the situation of land use and aspect of slope, evaluation of land resource is made by using the data base of land resource established by using microcomputer in Wangjiagou wate-shed.The result of evaluation shows that the area which is suitable or relatively suitable for farming is 4160 mu,while the actural area for farming is 5779mu; and the area suitable for planting tree and grass is 6727 mu, while the actural afforested and gras-sed area is 2625 mu. This shows that remoulding the cropland which is now not suitable for farming into forest and ;grass land is an arduous task of soil and water conservation work in Wangjiagou watershed.
出处
《中国水土保持》
北大核心
1990年第6期46-49,共4页
Soil and Water Conservation in China
