RELEASE-2022

Clip-harvest of herbaceous biomass occurs within randomly located clip-harvest strips in 20m x 20m plots or subplots. Up to 20 non-forested Distributed plots (containing 1 clip strip per plot) and up to 30 Tower plots (containing 1-4 clip strips per plot) are sampled at each site. Tower plots are sampled every year. Tower plots at ungrazed sites are sampled once per year if there is a single annual biomass peak, and twice at sites with two biomass peaks per year in order to capture both warm season and cool season production. At grazed sites, sampling in Tower plots occurs once every 4 or 8 weeks while livestock are present. Distributed plots are sampled once every 5 years.

草本生物量的刈割采样（clip-harvest）工作，在20m×20m样地或小样地内随机布设的刈割采样带中开展。每个研究站点需对最多20个无林分布式样地（Distributed plots，每个样地包含1条刈割采样带）以及最多30个铁塔样地（Tower plots，每个样地包含1-4条刈割采样带）开展采样工作。铁塔样地需每年采样：未放牧站点的铁塔样地，若该站点每年仅存在一次生物量峰值，则每年采样一次；若每年存在两次生物量峰值，则每年采样两次，以同时覆盖暖季与冷季的生物量产出。放牧站点的铁塔样地则在牲畜活动期间，每4周或8周采样一次。分布式样地每5年采样一次。