RDIFS_Lennon_Seek

A long-term study has been established at the Sevilleta LTER to monitor net primary production across four distinct ecosystems: creosote shrubland (C), blue grama grassland (B), black grama grassland (G), and pinon/juniper woodland (P). While measures of both below and aboveground biomass are important in estimating NPP, the described study focuses on estimating above ground biomass production (ANPP). Above ground biomass production (ANPP) is sampled three times a year (winter, spring and fall) for all species at each of the four sites (At this time, large woody bushes and trees at the P site are not measured). In addition, volumetric measurements are obtained from permanent plots at the four sites to build regressions correlating biomass and volume. (See nppweight_protocol_current).

研究团队于塞维利亚长期生态研究站点（Sevilleta LTER）设立了一项长期监测计划，旨在追踪四类典型生态系统的净初级生产力（Net Primary Production，NPP）：石炭酸灌丛（creosote shrubland，C）、格兰马草草原（blue grama grassland，B）、黑格兰马草草原（black grama grassland，G）以及矮松/桧木林（pinon/juniper woodland，P）。尽管地下与地上生物量的测定对NPP的估算均具有重要价值，但本研究的核心聚焦于地上生物量生产（Aboveground Net Primary Production，ANPP）的估算工作。针对四个监测站点内的所有物种，地上净初级生产力（ANPP）每年开展三次采样，分别于冬季、春季与秋季进行（目前矮松/桧木林站点内的大型木本灌丛与乔木暂不纳入测量范围）。此外，研究人员还将在四个站点的永久样地中获取体积测量数据，以构建生物量与体积的相关性回归模型。详细流程可参见nppweight_protocol_current文档。