NPP Grassland: Jornada, USA, 1970-1972, R1

This data set contains three ASCII files (.txt format). Two files contain above- and below-ground biomass and productivity data for a desert grassland in the Jornada Experimental Range, New Mexico, one file for an ungrazed treatment and the other for a light to moderately grazed treatment. The study site (32.60 N, -106.85 W, Elevation 1,350 m) is located in the Basin and Range geomorphic province at the northernmost extent of the Chihuahuan Desert, near the city of Las Cruces, New Mexico, about 60-km northwest of El Paso, Texas. The third file contains climate data for the period 1954-1992 obtained from a weather station located near the study site (32.62 N, -106.73 W, Elevation 1,300 m).

Dynamics of above-and below-ground plant biomass were monitored at roughly 2-week intervals during the growing season from 1970 to 1972. Data on above-ground live biomass, recent and old dead matter, and root-crown biomass are available for one to two replications of grazed and "ungrazed" (relatively undisturbed) treatments. Total below-ground biomass was also sampled. Data were collected as part of a coordinated study over 1-3 years at ten grassland sites of the central and western United States, under the US GrasslandBiome Project of the International Biological Program (IBP).

Annual above-ground net primary production (ANPP) was estimated, conservatively, by summing peak biomass of individual species, and annual below-ground net primary production (BNPP) estimated as the sum of positive increments in total root biomass.

本数据集包含三个 ASCII 格式的文本文件。其中两个文件记录了位于新墨西哥州乔朗达实验站（32.60 N, -106.85 W，海拔1,350米）的沙漠草原地上与地下生物量及生产力数据，分别对应未放牧处理和轻度至中度放牧处理。研究地点位于 basin and range 地貌省的北部边缘，毗邻新墨西哥州的拉斯克鲁塞斯市，距离德克萨斯州埃尔帕索市西北约60公里。第三个文件包含1954年至1992年期间从位于研究地点附近（32.62 N, -106.73 W，海拔1,300米）的气象站获取的气候数据。在1970年至1972年生长季节期间，每隔大约两周对地上及地下植物生物量的动态变化进行监测。可获取的数据包括地上活生物量、近期及陈旧死亡物质、以及根冠生物量的一个至两个重复样本，同时亦对地下生物量进行了采样。这些数据是在国际生物计划（International Biological Program, IBP）下的美国草原生物群落项目（US GrasslandBiome Project）协调研究中，对美国中部和西部十个草原地点进行的1-3年连续调查的一部分。通过累加个体物种的峰值生物量，保守估计了年地上净初级生产量（Annual above-ground net primary production, ANPP），而年地下净初级生产量（Annual below-ground net primary production, BNPP）则通过计算总根生物量的正值增量来估算。