丘陵地区土地可持续利用的景观生态评价

Landscape Ecological Evaluation for Sustainable Land Use in Hilly Area

景观生态学以人与景观的相互关系为着眼点 ,既注重景观系统的功能特征 ,又注重景观系统的稳定性和持续性 ,与土地可持续利用概念具有高度的一致性。以位于桂东南丘陵地区的广西横县为例 ,以土地可持续利用为目标 ,将土地利用持续性评价与景观生态学原理相结合 ,从景观生产力、景观受胁度与景观稳定性 3方面构建土地利用可持续性的景观生态评价指标体系 ,包括水土流失面积比、地均工农业产值、景观破碎度和生产力多样性等 14项指标 。

The goal of sustainable land use is to maintain or increase biological diversity in semi-natural landscapes and intensively used agricultural areas. Landscape ecology pays more attention to the relation between human and landscape, emphasizes the function, stability and sustainability of landscape system, and is highly consistent with the connotation of sustainable land use. Taking into account the productivity,menance and stability of landscape system, we construct landscape ecological indicators for evaluating sustainable land use in the hilly area, Hengxian County of Guangxi. According to the principles of systemic comprehensiveness, regional dominance, dynamic variability, landscape ecology, scientific validity and feasibility, fourteen indices were selected such as population density, land reclamation ratio, landscape diversity,landscape fragmentation, landscape contagion and landscape fractal. The method of mean covariance was adopted to measure the weight of indicators. The sustainability of land use for the whole county and every village and town were synthetically evaluated, The results of landscape ecological evaluation for case study in Hengxian County agree well with the fact. Therefore, some rational advices about sustainable utilization of land resources and the targets of ecological construction were brought forward.