黄土高原沟壑区王东沟流域土地利用/覆被变化过程初探

黄土高原沟壑区王东沟流域近20年来土地利用/覆被发生了较大变化，土地利用动态指数分别为：耕地3.21％，园地﹣36.11％，林地﹣4.05％，牧草地4.24％，居民点及独立工矿用地﹣0.62％，交通运输用地﹣12.27％，未利用地1.85％；变化趋势是：耕地逐年向园地流转，园地变化烈度较大，其他各类用地变化不太显著。引起这一变化的主要因素是自然、社会、经济、技术以及政策因素。结合这一变化，针对黄土高原沟壑区的实际情况，在黄土高原沟壑区土地利用经营与管理方面，应重视土地产出效益与粮食安全的关系，在保障区域粮食安全的基础上实现效益最大化。

Research on land use and cover change in Wangdonggou watershed on Regional Gully Watershed on Loess Plateau

The status of land use and cover in Wangdonggou watershed on regional gully watershed on loss plateau has a big change in the past 20 years. Those are the dynamic index of land use in the area: cultivated land: 3.21%, orchard and perennial plantation: -36.11%, forest land: -4.05%, pasture and grazing land: 4.24%, rural settlement area and mining area and isolated industrial area: -0.62%, land for transportation: -12.27%, unused land: 1.85%. This is the tendency of those changes: cultivated land has been transferred to orchard and perennial plantation, the change of orchard and perennial plantation is obvious, the changes of the other land are inconspicuous. The reasons of those changes are Natural causes, society causes, economy causes, technology causes and policy causes. Because of this change and the real situation of regional gully watershed on loss plateau, for the part of land management and land administration we should attach importance to the relationship between the benefit of land production and the safety of foodstuff. First, we should ensure the safety of foodstuff in this area, and then we can realize the biggest benefit of land production.