Comparisons of light response parameters and simulated NEE (NEEr) under sunny and cloudy sky conditions.

For each year, NEEr was calculated at the same PAR using Eq. (3) and the light response parameters in Table 6. The mean values were obtained for two sky conditions and total standard error was computed using Eq. (4).The meanings of Pmax, α and Rd were the same as Tables 1.Significance of the difference was “*” for P每年均以相同的光合有效辐射（Photosynthetically Active Radiation，PAR）水平，结合公式(3)与表6中的光响应参数计算NEEr。针对两种天空状况分别求取平均值，并通过公式(4)计算总标准误。Pmax、α及Rd的含义与表1一致。差异的显著性以"*"标记时对应P值。