Vegetation cover from line intercept transects in lagomorph exclosure and shrub removal plots at the Jornada Experimental Range, southern New Mexico, USA, 1938-2001

This package contains data from a study to quantify vegetation dynamics in response to lagomorph and shrub exclusion on the Jornada Experimental Range from 1938-2001. Data consist of vertical line intercept measures of the perennial grasses, suffretescents and shrubs. Sixteen plots at each of 3 sites (Gravelly Ridges, Dona Ana exclosure, and Parker Tank) were established in 1938-39. Plots were 21.3 x 21.3 m with a 7.6 m buffer zone between each. Plots were divided into east and west halves and 14 randomly located 10.65 m transects were located in each half plot. Vegetation was measured using vertical line intercepts in 1938, 1947, 1956, 1960, 1967, 1989, 1995, and 2001 for the Gravelly Ridges site, and in 1938/9, 1947, 1960, 1967, and 2001 for the Parker Tank and Dona Ana sites. The treatments include lagomorph exclusion (using wire fencing), shrub removal (hand grubbing at the ground surface), furrowing (shallow, hand raked furrows to trap surface water), and seeding (broadcast applications of seeds of native perennials). Seeding and furrowing treatments were only applied in 1939. Lagomorph exclusion has persisted since establishment, and shrub removal treatments have been reapplied immediately following all years of vegetation sampling. The dataset contains information on the site, year of data collection, plot number, line number, vegetation, and number of vegetation present on each line. This study is complete.For more information, refer to:Havstad, K.M., R.P. Gibbens, C.A. Knorr, and L.W. Murray. 1999. Long-term influences of shrub removal and lagomorph exclusion on Chihuahuan Desert vegetation dynamics. Journal of Arid Environments 42: 155-166. https://doi.org/10.1006/jare.1999.0516 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=210392001 Webpage with information and links to data files for download

本数据集囊括了一项针对1938年至2001年间乔恩达实验站（Jornada Experimental Range）植被动态变化的研究数据，旨在量化有蹄类动物和灌木排除对植被的影响。数据包括多年生草本植物、苔草和灌木的垂直线截距测量。自1938-39年间，在三个地点（砾石脊、多纳安排除区和帕克坦克）设立了16个样地。样地面积约为21.3 x 21.3平方米，并设有7.6米的缓冲区。样地被划分为东西两部分，每部分样地中随机布置了14个10.65米长的样带。植被测量采用垂直线截距法，分别在1938年、1947年、1956年、1960年、1967年、1989年、1995年和2001年对砾石脊地点进行测量，而对帕克坦克和多纳安地点则在1938/9年、1947年、1960年、1967年和2001年进行测量。处理措施包括有蹄类动物排除（采用铁丝围栏）、灌木移除（地面手工挖掘）、沟壑制作（浅层、手工耙平的沟壑以拦截地表水）和播种（播撒本地多年生植物种子）。播种和沟壑制作仅在1939年实施。有蹄类动物排除自建立以来一直持续，灌木移除处理则在每次植被采样后立即重新实施。数据集包含有关地点、数据收集年份、样地编号、线编号、植被类型以及每条线上植被数量的信息。本研究已圆满完成。欲了解更多信息，请参阅：Havstad, K.M., R.P. Gibbens, C.A. Knorr, and L.W. Murray. 1999. 长期以来灌木移除和有蹄类动物排除对奇瓦瓦沙漠植被动态的影响。Journal of Arid Environments 42: 155-166. https://doi.org/10.1006/jare.1999.0516 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=210392001 包含信息和数据文件下载链接的网页。