基于DLS模型的城市土地政策生态效应研究——以深圳市为例

Research on ecological effects of urban land policy based on DLS model:A case study on Shenzhen City

以快速城市化典型地区——深圳市为例,结合土地利用变化与生态质量评价模型对城市土地利用的数量控制和空间控制两类生态政策的生态效应进行了评估。结果表明:(1)在城市化发展过程中,由于城市用地扩张,城市生境面临破碎化增加、连通性降低、生境质量下降等生态风险,生态政策的实施可以在一定程度上缓解上述生态风险。(2)数量控制的生态政策可以提高土地利用的集约性,遏制景观破碎化和生境质量下降趋势和增强景观连通性,但可能造成城市开发强度上升,对城市用地周边生态环境产生影响。(3)空间控制的生态政策可以维护生态用地格局,遏制景观破碎化和生境质量下降趋势,但在维护景观连通性方面作用有限。(4)两种政策同时使用会产生协同效应,其效果优于单独使用两种政策。

Urban land ecological policy is an important management tool to enhance ecological construction and urban sustainable development. In this paper, Shenzhen was chosen as a typical case of rapid urbanization areas. A combination of land-use change and ecological effect quality models was used to evaluate the effects of two types of urban land- use policies, scale-control policy and space-control policy. The results showed that： （1） During the urbanization process, habitat fragmentation, connectivity decreasing and degradation are resources of ecological risks, which can be alleviated by the implementation of ecological policy. （2） Scale-control policy can enhance landscape connectivity and curb the trends of landscape fragmentation and habitat degradation, but it may result in an increase of the intensity of construction. （3） Space-control policy can maintain ecological land pattern, and curb the trends of landscape fragmentation and habitat quality decline, but it can play a limited role in maintaining the landscape connectivity. （4） The synergistic effect of simultaneously implementing the two policies results in better effects than separately implementing them.