Soil disturbance cover data on 1m x 1m plots from the long-term Small Mammal Exclusion Study (SMES) at Jornada Basin LTER, 1995-2015

This data package contains soil disturbance data from plots with various levels of herbivore exclusion on the Jornada Experimental Range. Study sites were established in 1995; one in black grama grassland and the other in creosotebush shrubland to compare the impact of herbivores on ecosystem processes between these vegetation types. Parallel studies were established at the Sevilleta LTER site (New Mexico, USA) and Mapimi Biosphere Reserve (Durango, Mexico). Each study site is 1 km by 0.5 km in area. Four replicate experimental blocks were randomly located at the grassland study site to measure vegetation responses using exclusion treatments including a) all mammalian herbivores, including cattle, lagomorphs, and rodents, b) lagomorphs and cattle only, c) cattle only, and d) control accessible to all herbivores. Because grazing cattle are excluded from the entire creosote site, only three replicate experimental blocks were randomly located there including a) all mammalian herbivores, including lagomorphs, and rodents, b) lagomorphs only, and c) control accessible to all herbivores. Thirty-six sampling points were positioned at 5.8-meter intervals on a systematically located 6 by 6 point grid within each plot. A permanent one-meter by one-meter vegetation measurement quadrat is located at each of the 36 points. Each year in spring and fall from 1995-2005, various forms of disturbances (human, rabbit, cow, antelope, rodent, etc) were measured by depth . After 2005, sampling frequency changed to every 5 years. This study is ongoing. 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=210086007 Webpage with information and links to data files for download

本数据包收录了来自 Jornada 实验区不同放牧排除等级地块的土壤扰动数据。研究地点自 1995 年设立，一处位于黑格兰马草原，另一处位于松香灌木丛，旨在对比不同植被类型下放牧对生态系统过程的影响。平行研究在 Sevilleta LTER 研究地点（美国新墨西哥州）和 Mapimi 生物圈保护区（墨西哥杜兰戈）进行。每个研究地点的面积为 1 平方公里乘以 0.5 平方公里。在草原研究地点随机布置了四个重复实验区块，以测量植被对包括以下排除处理的响应：a) 所有哺乳动物放牧者，包括牛、兔形目动物和啮齿动物，b) 仅兔形目动物和牛，c) 仅牛，以及 d) 可供所有放牧者访问的控制组。由于放牧牛被排除在整个松香研究地点之外，因此在该地点仅随机布置了三个重复实验区块，包括 a) 所有哺乳动物放牧者，包括兔形目动物和啮齿动物，b) 仅兔形目动物，以及 c) 可供所有放牧者访问的控制组。在每个地块内，以 5.8 米的间隔在系统布置的 6x6 点网格上定位了三十六个采样点。在每个采样点处，放置了一个永久性的 1 米乘以 1 米的植被测量样方。从 1995 年至 2005 年的春季和秋季，通过深度测量了各种形式的扰动（人类、兔子、牛、羚羊、啮齿动物等）。2005 年之后，采样频率变为每五年一次。该研究仍在进行中。本数据集中的资源包括：资源标题：网站指针指向 html 文件。文件名：网页，url：https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-jrn&identifier=210086007 网页包含信息以及指向数据文件的下载链接。