基于缓冲带的城乡边缘效应定量评价  

Quantitative assessment of rural-urban edge effects based on gradient buffer zones

作　　者：俞龙生[1] 李志琴[1] 

机构地区：[1]广州市环境保护科学研究院,广州市环境规划模拟重点实验室,广州510620

出　　处：《生态科学》2014年第3期507-512,共6页Ecological Science

基　　金：广州市科研条件建设项目(2012-224-2);广州市环境保护局项目(2012)

摘　　要：以缓冲带取样方法和群落边缘效应测度公式为基础,尝试构建城乡交错带景观边缘效应的定量评价模型。以广州市番禺区4期景观类型图为研究数据,基于梯度带上景观格局指数计算结果,分别计算了不同幅度的边缘效应强度和综合边缘效应强度。研究结果表明:边缘效应强度计算结果反映了城乡交错带在空间和时间上的景观动态特征。基于缓冲带的边缘效应评价方法,能够从总体上判断城乡交错区的位置,也能够反映核心区和城乡交错区的景观格局动态特征。景观格局的梯度变化分析可为城乡交错区位置的判定提供数据支持,景观指数的幅度效应也为交错区宽度的判断提供依据。Based on buffer zone sampling method and the edge effect measure formula of communities, this paper attempts to build quantitative evaluation model of the landscape edge effects in the urban-rural ecotone. Taking four landscape type maps of Panyu District, Guangzhou City, as data sources, based on the results of landscape pattern indices of gradient zones, the edge effect intensity（E） and comprehensive edge effect intensity（EC） were calculated for different extents. The results showed that the edge effect intensities reflect the landscape dynamic characteristics of urban-rural ecotone on both temporal and spatial scales. General determination of position of ecotone could be conducted by using the edge effect evaluation methods based on buffer zones, and it also can reflect the landscape pattern dynamic characteristics of urban core area and urban-rural ecotone. The gradient analysis and landscape indices could be used to determine the position of rural-urban ecotone, and the extension relations of landscape metrics provide a reference to examine width of rural-urban ecotone.

关 键 词：城市化 边缘效应 生态交错带 缓冲区 定量评价 

分 类 号：Q149[生物学—生态学]