Plant Cover at Permanent Quad Locations on the Jornada Experimental Range, 1915-ongoing

This ongoing data set contains basal cover of perennial grasses and canopy cover of shrubs in 122 1m x 1m quadrats on the Jornada Experimental Range in the northern extent of the Chihuahuan Desert of New Mexico, USA. These quadrats were established to investigate livestock grazing effects on plant community dynamics as well as responses to variable climatic conditions over time. Vegetation monitoring is carried out by charting the basal areas of perennial grasses and canopy areas of shrubs within each quadrat. Quadrats were established at different times, with start dates from 1915 to 1932. Specific quadrat locations were selected for a variety of reasons, but the overall intent was to represent varying plant community conditions across the Jornada Experimental Range. From 1915 to 1924 charting was done by dividing the quadrat frame into a decimeter grid using straps and reproducing locations of plants on grid paper. From 1925 to 2016 charting was done using a pantograph. With few exceptions, quadrats were charted until 1947, and a portion of the quadrats were charted intermittently between 1947 and 1979. Sampling resumed again in 1995 and continues every 5-6 years. Charts are digitally scanned, georeferenced, and chart features are digitally reproduced by hand. This data set is not yet complete; charts are actively being processed by Jornada Experimental Range staff and will be updated to this data package as they become available. A companion data package of counts of perennial forbs and subshrubs for each quadrat is also available for this project (data package knb-lter-jrn.210351002). Resources in this dataset:Resource Title: Website Pointer to html file. File Name: Web Page, url: https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-jrn&identifier=210351001 Webpage with information and links to data files for download

本持续更新的数据集收录了新墨西哥州奇瓦瓦沙漠北部琼达实验站122个1米×1米的样方中多年生草本植物的基盖度和灌木冠盖度。这些样方旨在研究牲畜放牧对植物群落动态的影响以及植物群落随时间对气候变化反应的研究。植被监测通过绘制每个样方内多年生草本植物的基盖面积和灌木的冠盖面积来完成。样方建立于不同时期，起始时间从1915年至1932年。选择特定的样方位置基于多种原因，但总体目的是代表琼达实验站内不同植物群落条件。从1915年至1924年，通过将样方框架划分为分米网格并使用皮带来复制植物在网格纸上的位置进行绘图。从1925年至2016年，使用绘图仪进行绘图。除少数例外，样方绘图一直持续到1947年，部分样方在1947年至1979年间间断性地进行绘图。1995年开始重新采样，并每隔5至6年进行一次。图表已进行数字化扫描、地理编码，并通过手工方式将图表特征数字化复制。本数据集尚未完整；琼达实验站的员工正在积极处理图表，并将随着其可用性更新至该数据包。与本项目相关的另一数据包提供了每个样方多年生草本植物和亚灌木的计数（数据包编号 knb-lter-jrn.210351002）。本数据集中包含的资源：资源标题：网站指针至HTML文件。文件名：网页，网址：https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-jrn&identifier=210351001 提供信息和数据文件下载链接的网页。