基于系统协调度的长株潭城市群城市土地集约利用评价研究

利用1997-2008年长株潭城市群城市土地利用统计资料，从状态、时间两个层面开展了长株潭城市群城市土地集约总体评价，结果表明:近10a来该城市群城市土地集约利用程度稳步上升，其中1997-2003年处于初等集约利用水平，2004-2008年处于中等集约利用水平，2008年接近高等集约利用状态，综合指数和5个子系统都朝有序方向发展。对城市土地集约利用程度影响较大的为土地利用结构集约和土地利用强度集约两个子系统。2002年、2003年长株潭城市群城市土地复合环境系统协调度为负，系统出现无序化发展的征兆；1997-2008年Moran’s I 值表明长株潭城市群城市土地利用集约度具有较明显的空间聚集特征，其中2008年的值最高，空间集聚特征最明显，而2002年的值最低。该结果对指导长株潭城市群实现城市土地资源的可持续发展、促进利用方式由低效益、粗放式向高效益、集约化转变具有一定的指导意义。

An Evaluation on Intensive Use of Urban Land in Changsha,Zhuzhou and Xiangtan Urban Agglomeration Based on a System Coordination Degree Model

In this paper,a system coordination degree model was employed to perform an evaluation on intensive use of urban land based on land use data of Changsha,Zhuzhou and Xiangtan Urban Agglomeration from 1997 to 2008.Spatial differences in urban land were investigated from perspectives of state and time.The results indicated that intensive use level of urban land in Changsha,Zhuzhou and Xiangtan Urban Agglomeration has progressively increased in recent years.The level of intensive use was at a primary stage during the period from 1997 to 2004.After 2004,the intensive degree showed an increasing trend and approached a value of 77.89 in 2008,a relatively high intensity.It was concluded that the primary factors for determining the level of intensive use are land use structure and land use intensity.The harmonious degree for five sub-systems all exhibited a curve showing the lowest and negative values both in 2002 and 2003,which indicated an obvious unstable status of urban land use system.Variations in values of Moran’s I from 1997 to 2008 demonstrated that the intensive degree of land use showed a high spatial aggregation feature.Overall,the value of Moran’s I was the highest in 2008,with showing a marked spatial aggregation feature.On the contrary,the value of Moran’s I was the lowest in 2002.It is especially critical for promoting sustainable development of urban land resources to substantially improving the efficiency of urban land utilization and to appropriately explore and protect urban land resources.The results presented in this study would offer a meaningful reference for study on intensive use of urban land and greatly benefit land utilization in Changsha,Zhuzhou and Xiangtan Urban Agglomeration.