Core Research Site Web Seasonal Biomass and Seasonal and Annual NPP Data for the Net Primary Production Study at the Sevilleta National Wildlife Refuge, New Mexico

This long-term study at the Sevilleta LTER measures net primary production (NPP) across four distinct ecosystems: creosote-dominant shrubland (Site C, est. winter 1999), black grama-dominant grassland (Site G, est. winter 1999), blue grama-dominant grassland (Site B, est. winter 2002), and pinon-juniper woodland (Site P, est. winter 2003), which is now in its own dataset, SEV278 (Pinon-Juniper (Core Site) Quadrat Data). Net primary production is a fundamental ecological variable that quantifies rates of carbon consumption and fixation. Estimates of NPP are important in understanding energy flow at a community level as well as spatial and temporal responses to a range of ecological processes. While measures of both below- and above-ground biomass are important in estimating total NPP, this study focuses on above-ground net primary production (ANPP). Above-ground net primary production is the change in plant biomass, including loss to death and decomposition, over a given period of time. Volumetric measurements are made using vegetation data from permanent plots collected in SEV129, "Core Research Site Web Quadrat Data" and regressions correlating biomass and volume constructed using seasonal harvest weights from SEV157, "Net Primary Productivity (NPP) Weight Data."

本研究依托塞维列塔长期生态研究站（Long Term Ecological Research, LTER）开展长期监测，针对四类典型生态系统测定净初级生产力（net primary production, NPP）：包括石炭酸灌木占优灌丛（C样地，1999年冬季设立）、黑格兰马草占优草原（G样地，1999年冬季设立）、蓝格兰马草占优草原（B样地，2002年冬季设立），以及矮松-桧木林（P样地，2003年冬季设立）。其中矮松-桧木林相关数据现已归入独立数据集SEV278（矮松-桧木（核心样地）样方数据，Pinon-Juniper (Core Site) Quadrat Data）。净初级生产力是一项核心生态变量，可量化碳消耗与固持速率。净初级生产力的估算结果，对于解析群落尺度的能量流动规律，以及生态系统对各类生态过程的时空响应具有重要意义。尽管地下与地上生物量的测量对于总净初级生产力的估算均至关重要，但本研究聚焦于地上净初级生产力（above-ground net primary production, ANPP）。地上净初级生产力指特定时段内植物生物量的变化量，其中包含因死亡与分解造成的生物量损失。本研究的体积测量采用来自SEV129数据集"Core Research Site Web Quadrat Data"（核心研究站点网络样方数据）的永久样地植被数据，并通过SEV157数据集"Net Primary Productivity (NPP) Weight Data"（净初级生产力（NPP）称重数据）中的季节性收获生物量，构建生物量与体积的相关回归模型。