中文摘要：

我国正处于高速城市化阶段,如何协调城市扩张、耕地保护与生态保育对土地资源需求的矛盾是当前我国土地利用中面临的主要问题。该文采用LANDSCAPE模型,以武汉市为例,以城市扩张、耕地保护和生态保育的协调为目标,开展土地利用布局优化。结果表明：1）在满足城市扩张规模与粮食安全的条件下,优化后城镇用地扩张对区域生态系统服务价值侵占仅为未优化布局的64%,该文提出的优化模型能显著提升城市扩张、耕地保护与生态保育的协调程度。2）当前城市扩张过程中土地系统生态服务价值流失过快,特别是城市中湖泊和草地大量减少,因而有必要改变当前的城市扩张模式,采取以城市化为导向的生态化发展政策,以实现城市扩张、耕地保护与生态保育的协调。研究结果可为武汉市土地利用优化布局和合理利用提供科学依据,也可为快速城市化进程中城市扩张、耕地保护与生态保育的协调提供方法支撑。

英文摘要：

China is in the stage of rapid urbanization, in which competitions among urban expansion, cultivated land protection and ecosystem conservation are unavoidable. In view of this conflict, taking Wuhan as an example, this paper carries out the lay -out optimization of land use pattern by using LANDSCAPE model based on CA model, attempting to achieve balanced development of urban expansion, cultivated land protection and ecosystem conservation. The results suggest that： under the dual constraints of the scale of urban expansion and food security, loss of ec：osystem services value caused by urban expansion in optimized allocation acct^uiits for only 64% of that in land allocation without optimization. The optimization model which is proposed in this research can significantly improve the synergic degree of urban expansion, cultivated land protection and ecological conservation. In the current process of urban expansion, the emsystem service value is lost too fast, especially in the lake and grass-land inside the city. T herefore, it is necessary to change the pattern of urban expansion to make synergy among urban expansion, cultivated land protec：tion and ecosystem conservation. Thus, ecology- oriented land use policies must be established to pro-vide an optimal compromise between urbanization, food security and ecosystem conservation. This research is helpful to provide scientific evidence to optimize land resources allocation in Wuhan as well as methodology for getting synergy among urban expansion, cultivated land protection and ecosystem conservation in rapid urbanization area.