Cover and density of semi-desert grassland plants in permanent quadrats mapped from 1915 to 1947
Cover and density of semi-desert grassland plants in permanent quadrats mapped from 1915 to 1947
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1915年至1947年永久样方中半荒漠草原植物的覆盖度和密度
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
P. Adler
中科院分区：
文献类型：
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作者：
Jed Anderson;M. McClaran;P. Adler
该历史数据集由位于美国亚利桑那州圣丽塔实验范围半沙漠草原上的 178 个永久 1 平方米样方组成。从 1915 年到 1933 年，每年（在大多数情况下）都会对这些样方中的单个植物进行识别和绘制地图，并于 1947 年再次进行。样方位于未放牧的围场和牲畜以不同强度放牧的牧场中。这些数据提供了独特的机会来测试放牧和气候变量对人口比率、植物间相互作用以及人口和群落动态的相互作用影响。我们提供以下数据和数据格式：（1）shapefile格式的数字化地图； (2) 以表格形式表示植物的质心或点位置（x,y 坐标）、植物的基底或冠层覆盖度（m2）、周长（m）以及每个植物记录的幼苗和克隆状态； (3) 样方信息，包括海拔、牲畜放牧历史以及与最近的长期降雨量计的接近程度； (4)月...
This historical data set consists of 178 permanent 1-m2 quadrats located on semi-desert grasslands at the Santa Rita Experimental Range, Arizona, USA. Individual plants in these quadrats were identified and mapped annually (in most cases) from 1915 to 1933 and again in 1947. Quadrats were located in ungrazed exclosures and in pastures grazed at various intensities by livestock. These data provide unique opportunities to test the interactive effects of grazing and climate variables on demographic rates, plant–plant interactions, and population and community dynamics. We provide the following data and data formats: (1) the digitized maps in shapefile format; (2) a tabular representation of centroid or point location (x, y coordinates), basal or canopy cover (m2) for plants mapped as polygons, perimeter length (m), and seedling and clone status for each individual plant record; (3) quadrat information including elevation, livestock grazing history, and proximity to closest long-term rainfall gauge; (4) month...