Land Resource Carrying Capacity Research Ofhaidong City

Land resource is important to human production and living,and is the basis of other resources.The research of resources' bearing capacity is an important content of regional sustainable development,and the bearing capacity of land resources has been a focus and core of resources' bearing capacity research.Haidong city is located in Hehuang valley which is suitable for farming and living,and is Qinghai province's main production base of commodity grain,vegetable and fruit.Using the single factor evaluation method on this paper made an empirical study of Haidong city land resource carrying capacity from the aspects of urban and rural construction land and land food production.First,this paper analyzed the natural conditions and practical development condition of Haidong city.And then based on the planning area for urban and rural construction land,crop output from2009 to 2015 and the production of main products of animal husbandry from the overall plan of land utilization of Haidong Prefecture(2006-2020),using grey models(1,1)predicted the nutritional ingredient of main food in Haidong city and its counties during past 15 years.According to the high,medium,low plan of per capita urban and rural construction land and per capita nutritional requirement,this paper predict the carrying capacity of urban and rural construction land and crop output in 2015,2020,2025 and 2030 based on present living standard in Haidong city.At last,this paper using cannikin law ascertain the limiting factor of carrying capacity,and find the final result of land resource carrying capacity in Haidong city.And then calculate the relative resource capacity of Haidong city and its counties based on GDP and crop land area.The results showed that:(1)The carrying capacity of urban and rural construction land in high,medium,low plan during 2015-2030 will be in a surplus state and increasing trend.(2)The carrying capacity of land food production in high,medium,low plan during 2015-2030 in Haidong city in the trend of falling volatility,transition from surplus to overload.Minhe county and Hualong county and Xunhua county will be in an overload state generally.(3)The carrying capacity of land food production is the short slab of land resource carrying capacity.(4)In 2015,the relative carrying capacity of resources of Haidong city ranked in the second place in Qinghai province,and the comprehensive carrying capacity is in surplus state.The contribution to comprehensive carrying capacity of land resource carrying capacity is larger than economic resources carrying capacity.