摘要
通过研究榆林地区无定河流域各自然环境因子和人类活动特点，根据各有关因子在空间上的组合将该区分为３个一级，３７个二级土地生态系统，在此基础上，分析了土地生态系统区域结构特征和不同土地生态系统类型在生态和经济效益方面的差异。
The Loess Plateau,the most serious soil erosion region in the world,has the complexland eccoystem constituting of various natural factors and human activity.Three main classes andthirty-seven sub-classes of land ecosystem are divided based on the analysis of the characteristics,relationship,spatial combination of the relevant factors.The structural pattern of land ecosystemand eco-economic effects of different land ecnsystems were discussed finally,usually the relativelystable land ecocystem has a good eco-economic effects comparing with the degraded and sensitiveland ecosvstem.
基金
国家自然科学基金
关键词
土地生态系统分类
生态经济分析
土壤退化
人类活动
自然环境
Land ecosystem
relatively stable land ecosystem
degraded land ecosystem
vulnerable land ecosystem
eco-econonuc evaluation
