Photosynthesis-irradiance measurements collected during Palmer LTER station seasons at Palmer Station Antarctica, 1991 - 1993.

Photosynthesis-irradiance measurements are used to derive P-I relationships and to calculate primary production for each discrete sample. Blue-green photosynthetron method described by Prezelin et al. (1994) were used to determine photosynthesis irradiance (P-I) relationships for collected samples. Non-linear cureve fits for the P-I data were calculated using the simplex method of Caceci & Cacheris (1984). Curve fitting provided estimates of Pmax (the light saturated rate of photosynthesis) and alpha (the affinity for photosynthesis at light-limited irradiances.

光合-辐照度测量（Photosynthesis-irradiance measurements）可用于推导P-I关系，并为各离散样本计算初级生产力。本研究采用Prezelin等（1994）所描述的蓝藻光合仪（Blue-green photosynthetron）法，对采集的样本开展光合-辐照度（P-I）关系测定。针对P-I数据的非线性曲线拟合，采用Caceci与Cacheris（1984）提出的单纯形法完成计算。曲线拟合可得到光饱和光合速率（Pmax）与光限制辐照度下的光合亲和力（alpha）的估计值。