土地利用变化包括土地利用结构和土地利用强度两个方面,是土地利用类型从低生态位层次向高生态位转变的自组织行为。对不同层次的土地利用生态位进行控制与协调,才能实现一定耕地保有量下土地利用资源场的均衡。而这种均衡正是耕地总量动态平衡得以实现的前提。在生态位势理论与系统边界理论的基础上,论文构建了土地利用经济生态位的模型,并以江苏省锡山市为例定量分析了不同土地利用类型相互作用的强度。研究显示,经济发达区非农用地与农用地生态位差较大,城市化进程加快,使耕地更易损失。从资源流动的场论分析角度,探讨了建立耕地保护机制的途径和方法。在目前的水平上,把土地利用生态位作为土地利用/覆被研究中的一种新方法论更有意义。

Land use change is a self-organized behavior of conversion from low niche level to high level,including two aspects of its structure and intensity.Only under the control and con-cordance with land-use niche in different levels,the balance of its resource field can be kept in certain arable land maintenance.And this balance is the precondition to keep the dynamic bal-ance maintenance of total arable land.On the basis of the niche theory and the system boundary theory,in this paper we made up the model of land-use niche and took the Xishan City,Jiangsu Province as an example to quantitatively analyze interactive intensities in different land use types.The study shows that the cropland loses easily because the niche difference between non-a-gricultural land and agricultural land is big and the urbanization process gets fast.At last we dis-cussed an approach to set up mechanisms of cropland conservation using the resource flow field theory.At present level,it is more significant that land use niche is as a new method in LUCC studies.