Level IV Ecoregions of Arkansas

Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and...按州划分的生态区数据集从无缝全国形状文件（shapefile）中提取得到。生态区指代在生态系统、类型与质量等方面具有总体相似性的区域。