土地利用变化对城郊农业区生态效益的影响——以四川省南充市高坪区为例

借鉴生态效益综合评价的有关理论和数学模型,以四川省南充市高坪区为例,选取生物多样性指数、植被覆盖指数、水土保持效益指数、土壤改良指数、涵养水源指数、拦截径流指数和湿度指数7个指标作为评价因子,建立生态效益评价体系,对该区域1996和2005年2个时期综合生态效益进行评估和比较.结果表明,该区域综合生态效益值分别为7.85和7.95,2005年比1996年略为升高;基于GIS的图层叠置、分割等分析功能,就区域土地利用变化对其内部生态效益造成的变化进行了分析,该区域可被划分为生态效益显著增强区、增强区、保持区、减弱区和显著减弱区5个等级.

Effect of Land Use on Ecological Benefit of Farm Belt in Suburbs

Farm belt in suburbs,as a kind of special agriculture area,has its own ecological benefit,which varies with land use patterns.With the aid of the GIS and SPSS techniques and mathematical models,a case study was conducted of Gaoping District,Nanchong City,Sichuan Province.Integrated ecological benefits of the district in 1996 and 2005 were evaluated and compared,using an ecological benefit evaluation system,composed of seven indexes,such as biological diversity,vegetation coverage,water and soil conservation effect,soil organic matter content,water-holding capacity,runoff interception rate,and air humidity.Results indicate that the integrated ecological benefit was 7.85 in 1996 and 7.95 in 2005;By making use of the analytic functions of GIS,like superposition and division,analysis was done of effect of change in land use on internal ecological benefit in the region.In terms of ecological benefits,Gaoping was divided into five zones: remarkably enhanced zone,enhanced zone,maintained zone,weakened zone,and significantly weakened zone.