光合辐射(par)：确定光合有效辐射。
PAR (photo synthetic radiation) : to determine the active PAR.
根据不同条件，可以选择不同的因子来计算光合有效辐射。
According to the different conditions, different affecting factors can be selected into calculations of PAR.
影响河北核桃净光合速率日变化的主要因子是光合有效辐射、叶片温度及胞间CO_2浓度。
The diurnal variation of Pn in hebei-walnut was influenced by light intensity, leaf temperature and intercellular CO2 concentration.
并在此基础上，以光合有效辐射、温度和降雨量作为气候指标，分析了它们与牧草长势之间的关系。
On this basis, this paper takes effective photosynthesis radiation, temperature and rainfall as climatic indexes, and analyzes their relations with pasture growth.
与中国东部平原区相比，青藏高原光合有效辐射的相对通量稍低，但其绝对量仍远远高于中国东部平原地区。
Compared with those in the eastern plain of China, the relative flux of par on Tibetan Plateau is a little lower, but the absolute flux of par is far higher.
栽培方式对叶幕叶片光合有效辐射截留、叶果际温度微气候产生显著影响，T架与篱架叶幕温度微气候优于棚架；
Training systems had great influence on the leaf PAR capture, leaf and fruit temperature microclimate. Canopy temperature microclimate was better in T-bar and hedgerow trellis than in pergola trellis.
结果表明，塑料大棚茶园内，光合有效辐射仅为棚外茶园的39.3% ，导致茶树光合速率平均比对照低2 7.5 % ；
The results showed that the light intensity in the plastic green house was significantly reduced and only 39.3% of the control, resulting in net photosynthetic rate (Pn) decreased by 27.5%.
结果表明，塑料大棚茶园内，光合有效辐射仅为棚外茶园的39.3% ，导致茶树光合速率平均比对照低2 7.5 % ；
The results showed that the light intensity in the plastic green house was significantly reduced and only 39.3% of the control, resulting in net photosynthetic rate (Pn) decreased by 27.5%.
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