Biotic homogenization of wetland vegetation in the conterminous United States driven by Phalaris arundinacea and anthropogenic disturbance

This is the dataset used in the Landscape Ecology publication of the same name. This dataset consists of the following files: NWCA_Int_Veg.txt NWCA_Reg_Veg.txt NWCA_Site_Attributes.txt NWCA_Int_Veg.txt is a site and plot by species matrix. Column labeled SITES consists of site IDs. Column labeled Plots consist of Plot ID numbers. All other columns represent species abundances (estimates of percent cover, summed across five plots). NWCA_Reg_Veg.txt is a site by species matrix of species abundances. Column labeled SITES consist of site IDs. All other columns represent species abundances (estimates of percent cover within individual plots). NWCA_Site_Attributes.txt is a matrix of site attributes. Column labeled SITES consist of site IDs. Column labeled AA_CENTER_LAT consist of latitudinal coordinates for the Assessment Area center point in decimal degrees. Column labeled AA_CENTER_LONG consist of longitudinal coordinates for the Assessment Area center point in decimal degrees. Column REFPLUS_NWCA represents disturbance gradient classes including MIN (minimally disturbed), L (least disturbed), I (intermediate), M (most disturbed). Column REFPLUS_NWCA2 represents revised disturbance gradient classes based on protocols described in the article. These revised classes were used for analysis. Column labeled STRESS_HEAVYMETAL represents heavy metal stressor classes, used to ascertain which wetlands were missing soil data. Classes in the STRESS_HEAVYMETAL column include Low, Moderate, High, and Missing. Sites with Missing STRESS_HEAVYMETAL classes were removed from analysis. More information about this dataset: All of the data used in this analysis was gathered from the National Wetlands Condition Assessment. Wetland surveys were conducted from 4/4/2011 to 11/2/2011. The entire National Wetlands Condition Assessment Dataset, which includes 3640 unique taxonomic identities of plants, can be found at: https://www.epa.gov/national-aquatic-resource-surveys/data-national-aquatic-resource-surveys

本数据集系《景观生态学》出版物同名的数据集。该数据集包含以下文件：NWCA_Int_Veg.txt、NWCA_Reg_Veg.txt、NWCA_Site_Attributes.txt。NWCA_Int_Veg.txt 为按物种编制的地点与样地矩阵，其中标记为 'SITES' 的列包含地点标识符，标记为 'Plots' 的列包含样地编号。其余所有列代表物种丰度（五块样地覆盖百分比的估算总和）。NWCA_Reg_Veg.txt 为按地点编制的物种丰度矩阵，其中标记为 'SITES' 的列包含地点标识符，其余所有列代表物种丰度（单个样地内覆盖百分比的估算）。NWCA_Site_Attributes.txt 为地点属性矩阵，其中标记为 'SITES' 的列包含地点标识符，标记为 'AA_CENTER_LAT' 的列包含评估区域中心点的纬度坐标（十进制度），标记为 'AA_CENTER_LONG' 的列包含评估区域中心点的经度坐标（十进制度）。列 REFPLUS_NWCA 表示干扰梯度类别，包括 MIN（最小干扰）、L（最少干扰）、I（中等干扰）、M（最大干扰）。列 REFPLUS_NWCA2 表示基于文章中描述的协议修订的干扰梯度类别。这些修订类别被用于分析。标记为 STRESS_HEAVYMETAL 的列代表重金属胁迫类别，用于确定哪些湿地缺少土壤数据。STRESS_HEAVYMETAL 列中的类别包括低、中、高和缺失。标记为缺失的 STRESS_HEAVYMETAL 类别的地点被排除在分析之外。关于本数据集的更多信息：本分析所使用的数据均来自国家湿地状况评估。湿地调查于 2011 年 4 月 4 日至 11 月 2 日进行。完整的国家湿地状况评估数据集，包括 3640 个独特的植物分类学身份，可在以下网址找到：https://www.epa.gov/national-aquatic-resource-surveys/data-national-aquatic-resource-surveys