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景观是由若干相互作用的生态系统构成 的。因此,构成景观的基本的、相对均质的 生态系统或单元即景观要素。美国生态学家 FormanGodron和法国生态学家(1981,1986) 在观察和比较各种不同景观的基础上,认为 组成景观的景观要素类型不外乎3种:斑块/ 缀块/嵌块体(patch)、廊道/走廊(corridor)和 基底/本底/基质(matrix),如图所示

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开篇案例 我A公司与美国B公司以CIF纽 约的条件出口一批农产品,订约 时,我A公司已知道该批货物要 转销加拿大。该货物到达纽约后, 立即转运加拿大。其后纽约的买 主B凭加拿大商检机构签发的在 加拿大检验的证明书,向我方提 出索赔

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