ENVIRONMENTAL PROBLEMS AND DEVELOPMENT OF AGRO-PASTORAL PRODUCTIVITY IN ECOTONE BETWEEN AGRICULTURE AND ANIMAL HUSBANDRY IN COLD SEMIARID AREAS IN NORTHERN CHINA
北方高寒半干旱农牧交错带资源环境障碍与农牧生产力开发

The ecotone between agriculture and animal husbandry in the cold,semiarid region of China are facing three problems of ecological deterioration,grain and fodder shortage,and economic backwardness due to the cold,arid and barren soil eco environment and the low input.According to the analysis of the potential productivity of agricultural resources in the region,the sutdy points out the way out of developing primary productivity via more fertilizations to farmland and using artificial cultivation of grassland,as well as of exploiting regional cold resources via development of more vegetable crops for warm zone market.It also discusses the scientific problems awaiting to be solved in regional agro pastoral development and prospectives of exploitation.