Level IV Ecoregions of the Conterminous United States
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Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. They are designed to serve as a spatial...
生态区（Ecoregions）指生态系统与环境资源的类型、质量及数量均具有普遍相似性的区域。其设计初衷是作为一类空间……
