The data set covers a 101-yr period (1915–2016) of quadrat-based plant sampling at the Jornada Experimental Range in southern New Mexico. At each sampling event, a pantograph was used to record the location and perimeter of living plants within permanent quadrats. Basal area was recorded for perennial grass species, canopy cover area was recorded for shrub species, and all other perennial species were recorded as point data. The data set includes 122 1 × 1 m permanent quadrats, although not all quadrats were sampled in each year of the study and there is a gap in monitoring from 1980 to 1995. These data provide a unique opportunity to investigate changes in the plant community over 100 yr of variation in precipitation and other environmental conditions. We provide the following data and data formats: (1) the digitized maps in shapefile format; (2) a data table containing coordinates (x, y) of perennial species within quadrats, including cover area for grasses and shrubs; (3) a data table of counts of annual plant individuals per quadrat; (4) a species list indicating growth form and habit of recorded species; (5) a table of dates when each quadrat was sampled; (6) a table of the pasture each quadrat was located within (note that pasture boundaries have changed over time); (7) a table of depth to petrocalcic layer measurements taken at quadrat locations; (8) a table of particle size analysis of soil samples taken at quadrat locations; (9) a table of topographic characteristics of quadrat locations (e.g., concave or convex topography). Pantograph sampling is currently conducted at 5-yr intervals by USDA-ARS staff, and new data will be added periodically to the EDI Data Portal Repository (see section V.E.2). This information is released under the Creative Commons license—Attribution—CC BY and the consumer of these data is required to cite it appropriately in any publication that results from its use.

中文翻译：

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1915-2016 年，新墨西哥州 Jornada 实验区沙漠草地植被的基于方阵的监测

该数据集涵盖了新墨西哥州南部 Jornada 实验范围内基于样方的植物采样的 101 年期间（1915-2016 年）。在每个采样事件中，使用受电弓来记录永久样方内活植物的位置和周长。记录多年生草种的基础面积，记录灌木种类的冠层覆盖面积，所有其他多年生植物记录为点数据。该数据集包括 122 个 1 × 1 m 永久样方，尽管并非在研究的每一年都对所有样方进行采样，并且从 1980 年到 1995 年的监测存在差距。这些数据提供了一个独特的机会来调查植物群落的变化降水和其他环境条件的 100 年变化。我们提供以下数据和数据格式： (1) shapefile 格式的数字化地图；X，ÿ) 样方内的多年生物种，包括草和灌木的覆盖面积；(3) 每样方一年生植物个体数数据表；(4) 记载物种生长形态和习性的物种名录；(5) 每个样方采样的日期表；(6) 每个样方所在的牧场表（注意牧场边界随时间变化）；(7) 在样方位置进行的岩钙层测量深度表；(8) 样方点土样粒度分析表；(9) 样方位置的地形特征表（例如，凹形或凸形地形）。目前，美国农业部-ARS 工作人员每 5 年进行一次受电弓采样，新数据将定期添加到 EDI 数据门户存储库（参见 VE2 部分）。