Level IV Ecoregions of the Mississippi Alluvial Plain

Ecoregions for the Mississippi Alluvial Plain were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in...密西西比河冲积平原（Mississippi Alluvial Plain）的生态区（ecoregions）从无缝全国形状文件（shapefile）中提取得到。生态区指在生态系统及……方面具有总体相似性的区域。