小流域农林牧业土地利用规划的数量分析

根据小流域自然条件、土地利用、治理措施和生产状况的综合分析与评价，定量化研究了土地利用结构的动态变化与方式。影响土地利用结构的主要因素有坡地面积、土地利用总面积、总投入、梯田或台地面积。模型预测结果表明：小流域总产值在１９９４－２０００年间将以１４．５％的年均增长率增长。农林牧业土地利用规划的最佳比例分别是５２．１４％，大于３０％和不超过１５％。

Quantitative Analysis of Land Unitilization Plan for Farming Forestry and Animal Husbandry in Small Watershed

The objective of small watershed comprehensive harness in gullied region of loess plateau is to form a efficient agricultural eco-economic system.After the small watershed comprehensive harnessing at Wangdong gully for 10 years, an obvious benefit has been achieved as follows:1.the agricultural structure has been changed remarkably;2.the land resources has been unitilized efficiently;3.the road net for erosion controlling of gully slope at small watershed has been built;4.the average productivity of grain is 3750kg/hm²;5.the net income per capita from 230 Yuan to 1313 Yuan;6.the sediment discharge reduces from 1860t/(km².a)to 800/(km².a);7.the ratio of forested area rises from 18%to 39.5%.The key to comprehensive harnessing is to use land resources efficiently and in all-round way, it includes to raise laud productive force, to retain the runoff from village road and stiff ground in plateau region;to develop economic fruit belt and set up erosion controlling techniques systom in gully slope;to construct forest belt of soil and water conservation in the valley.Finally, the benefits of society, economy and ecology are achieved at the same time