Red Alder Basal Area, by Stream Reach, for the Pacific Northwest

Red alder (Alnus rubra) are a common component of forests in Western Oregon and Washington. This file provides an estimate of red alder basal area in western Oregon and Washington for each incremental catchment of the USGS Pacific Northwest SPARROW model.红桤木（Alnus rubra）是俄勒冈州西部与华盛顿州森林中的常见组成树种。本数据集提供了美国地质调查局（USGS）太平洋西北地区SPARROW模型各增量集水区内，俄勒冈州西部与华盛顿州境内红桤木断面积的估算值。