Data Paper. Data Paper

File List shapefiles.zip -- Shapefiles compressed together in a zipped dirctory. 33,505,926 bytes readme.txt -- 3 January 2012 explanation for file corrections <br> <br> All .csv files are ASCII text, comma separated:<br> allrecords_density.csv - 125,201 records, 9,414,808 bytes<br> allrecords_cover.csv - 81,365 records, 7,606,877 bytes<br> quad_info.csv - 44 records, 656 bytes.<br> quad_inventory.csv - 14 records, 2,086 bytes<br> species_list.csv - 155 records, 5,128 bytes<br> daily_climate_data.csv - 5114 records, 128,441 bytes<br> annuals_counts_v3.csv - 2,536 records, 68,899 bytes<br> species_name_changes.csv - Originally assigned plant names were corrected for synonyms based on the USDA Plants Database (http://plants.usda.gov/). Name changes are recorded in this file. 86 records, 3,387 bytes<br> DescriptionThis historical data set consists of 44 permanent 1-m² quadrats located on northern mixed prairie in Miles City, Montana, USA. Individual plants in these quadrats were identified and mapped annually from 1932 through 1945. Quadrats were located in six pastures assigned to cattle grazing treatments with light, moderate, and heavy stocking rates of 1.24, 0.92, and 0.76 ha/ animal-unit-month (two pastures in each). 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 version of the entire data set (a table that replaces the full spatial data with one (<i>x</i>,<i>y</i>) coordinate for each individual perennial plant record); (3) grazing treatment information; (4) an inventory of the years each quadrat was sampled; (5) a species list, containing information on plant growth forms and shapefile geometry type (e.g., points or polygons); (6) a record of changes in species names; (7) daily precipitation and temperature records; and (8) counts of annual plants in the quadrats (annuals were counted, not mapped, by the original mappers).<br> <br> <i>Key words: climate; demography; Geographic Information Systems (GIS); Montana; northern mixed prairie; plant community; plant population; species interactions</i>

文件列表：
shapefiles.zip —— 压缩为ZIP归档的形状文件（Shapefiles），大小33,505,926字节
readme.txt —— 2012年1月3日发布的文件修正说明文档

所有CSV文件均为逗号分隔的ASCII文本文件：
allrecords_density.csv —— 包含125,201条记录，大小9,414,808字节
allrecords_cover.csv —— 包含81,365条记录，大小7,606,877字节
quad_info.csv —— 包含44条记录，大小656字节
quad_inventory.csv —— 包含14条记录，大小2,086字节
species_list.csv —— 包含155条记录，大小5,128字节
daily_climate_data.csv —— 包含5114条记录，大小128,441字节
annuals_counts_v3.csv —— 包含2,536条记录，大小68,899字节
species_name_changes.csv —— 基于美国农业部植物数据库（http://plants.usda.gov/）对植物原始命名的同物异名修正结果记录文件，共86条记录，大小3,387字节

本历史数据集包含位于美国蒙大拿州迈尔斯城北部混合草原的44个永久性1平方米样方（quadrats）。1932年至1945年间，研究人员每年对这些样方内的所有植物个体进行物种鉴定与点位测绘。样方分布于6个牧场，分别接受轻度、中度、重度三种牛放牧处理，对应载畜率分别为1.24、0.92、0.76公顷·动物单位月⁻¹（每种处理对应2个牧场）。本数据集为探究放牧与气候变量对植物种群统计率、种间相互作用以及种群与群落动态的交互影响提供了独特的研究契机。本次公开的数据及对应格式如下：
1. 形状文件（Shapefile）格式的数字化测绘图；
2. 全数据集的表格化版本：该表格以单组(x,y)坐标替代完整空间数据，对应每一条多年生植物个体记录；
3. 放牧处理信息；
4. 各样方的采样年份清单；
5. 物种列表，包含植物生长型及形状文件几何类型（如点或多边形）等信息；
6. 物种命名变更记录；
7. 日降水量与日气温数据集；
8. 样方内一年生植物的统计数据：原始测绘人员仅统计了一年生植物的数量，未进行点位测绘。

关键词：气候；种群统计学；地理信息系统（Geographic Information Systems, GIS）；蒙大拿州；北部混合草原；植物群落；植物种群；物种相互作用