End of Year Biomass in Marshes of the Virginia Coast Reserve 2021-

Primary productivity is one of the core areas of the LTER Network. The Marsh End-of-Year-Biomass (EOYB) dataset quantifies annual net primary productivity through aboveground plant harvest at peak biomass. The dataset will help to detect changes in marsh zonation, marsh transgression, community assembly, and primary productivity in each of four vegetation zones that span the tidal marsh ecosystem. In six permanent plots (1.5m x 1.5m) in each of the four zones (creek bank, low marsh, high marsh, and transition zone), all aboveground biomass and standing dead biomass in a 0.25m x 0.25m subplot is harvested each year. Biomass is sorted to species and categorized as alive or dead, dried at 60C for 3 days, and dry weight is recorded. End-of-Year biomass data is collected at salt marshes located in Norhtampton Co., VA. Older data (1999-2021), using a different sampling protocol, may be found in dataset VCR09159 (knb-lter-vcr.167).

初级生产力是长期生态研究网络（LTER Network）的核心研究领域之一。沼泽年末生物量（End-of-Year-Biomass, EOYB）数据集通过在生物量峰值期收割地上植物量，量化年度净初级生产力。该数据集可用于监测覆盖潮汐沼泽生态系统的四个植被带内的沼泽带状分布、沼泽海侵、群落组装以及初级生产力的变化。在四个植被带（溪岸带、低潮沼泽、高潮沼泽与过渡带）各设置6个永久样地（1.5m×1.5m），每年在每个样地内的0.25m×0.25m小样方中收割全部地上生物量与立枯生物量（standing dead biomass）。研究人员会将生物量按物种分类，并区分为活体与死体，在60℃条件下烘干3天后记录其干重。年末生物量数据采集于弗吉尼亚州北安普顿县（Northampton Co., VA）的盐沼中。1999年至2021年的历史数据采用了不同的采样规程，可从数据集VCR09159（knb-lter-vcr.167）中获取。