NPP Grassland: Beacon Hill, U.K., 1972-1993, R1

This data set contains two ASCII text files, one providing productivity measurements for a chalk grassland on Beacon Hill, West Sussex, U.K. (50.92 N, -0.85 W) and the other containing climate data from a weather station at the former King's College London, Rogate Field Centre, 6 km distant (51.01 N, -0.85 W). Measurements of above-ground live biomass and total dead matter were made by harvesting 0.25 m2 quadrats in the 20 x 20-m study area at eight to ten week intervals from March 1972 to April 1973. Precipitation amount and minimum/maximum temperature were recorded from 1969 through 1993.

Above-ground net primary production (ANPP) was estimated by several methods: 332 g/m2/year (annual increase in living biomass, sum of species); 355 g/m2/year (peak or maximum live biomass, plant dry matter weight); 773 g/m2/year (maximum live + dead biomass); 310 g/m2/year (annual increase in living biomass carbon by summing positive increments in biomass); and 691 g/m2/year (annual net production accounting for leaf turnover). The carbon content of ANPP (accounting for leaf turnover) was estimated to be 310 gC/m2/year using a conversion factor of 0.45. Below-ground production was not measured.

Revision Notes: Only the documentation for this data set has been modified. The data files have been checked for accuracy and are identical to those originally published in 1998.

本数据集包含两个 ASCII 文本文件，其一提供了位于英国西苏塞克斯郡比肯山（北纬50.92度，西经-0.85度）的粉状草地生产力测量数据；其二则包含了位于前伦敦国王学院罗加特田野中心（距离6公里，北纬51.01度，西经-0.85度）的气象站气候数据。地上生物量和总死亡物质通过在1972年3月至1973年4月期间，以每八至十周为间隔，在20米×20米的实验区域采集0.25平方米的样方进行测量而得。降水量及最低/最高温度的数据记录自1969年至1993年。地上净初级生产量（ANPP）通过多种方法进行估算：332克/平方米/年（生物量年增长率，物种总和）；355克/平方米/年（峰值或最大活生物量，植物干物质重量）；773克/平方米/年（最大活+死生物量）；310克/平方米/年（通过累加生物量正增长量来计算生物量的年增长率）；以及691克/平方米/年（考虑叶周转的年净生产量）。使用转换系数0.45估算的ANPP（考虑叶周转）的碳含量为310克碳/平方米/年。地下生产量未进行测量。修订笔记：仅对数据集的文档进行了修改。数据文件已核准确认，与1998年原版发布的数据完全一致。