基于格网GIS的五华县生态脆弱性评价

Ecological Vulnerability Assessment of Wuhua County Based on Grid GIS

在充分研究梅州市五华县环境现状基础上,构建其生态脆弱性评价三级指标体系,并应用主成分分析法和层次分析法求取指标因子权重,在ArcGIS中进行加权计算以探究五华县生态脆弱性规律,得到结论:①五华县生态系统整体偏脆弱,人口、企业、农田集密度越高脆弱性越强,其强度由东北-西南轴区域向周边扩散。②由因子与脆弱性指数进行相关性分析发现大部分自然因素呈稳定状态且有利于生态自主调节机制;人为因素则具备巨大的破坏潜力,向自然环境直接或间接施加破坏,干扰系统调节能力。③五华县中部区域以治理为主,注重工业、农业污染治理修复;周边区域以预防为主,防治森林破坏、过度开垦等。

Based on the full study of the environmental situation of Wuhua County in Meizhou City,we constructed the three-level index system of ecological vulnerability assessment,used the principal component analysis method and the analytic hierarchy process to obtain the weights of index factors,and carried out the weighting calculation in ArcGIS to explore the ecological vulnerability rule of Wuhua County.The results show that(1)the overall ecosystem of Wuhua County is tend to be fragile,and the higher the density of population,enterprises and farmland,the stronger the vulnerability,and its intensity spreads from the northeast-southwest axis area to the periphery.(2)Through the correlation analysis between factors and vulnerability index,we find that most natural factors are stable and beneficial to ecological self-regulation mechanism,and human factors have great potential to damage,which directly or indirectly exert damage to the natural environment and interfere with ecosystem adjustment ability.(3)The central part of Wuhua County should mainly be based on governance,focusing on industrial and agricultural pollution governance and restoration,and the surrounding areas should mainly be based on prevention,prevention of forest destruction and excessive reclamation and so on.