Photosynthetically active radiation (PAR) had no significant directly influence to the Pn, but through other factors affect Pn indirectly. 光合有效辐射对青冈栎光合速率直接影响不显著，而主要是通过其它因子间接影响光合速率。
Wavelength-selective or photoselective mulches absorb photosynthetically active radiation （PAR） and transmit solar infrared radiation. 波长选择性或光选择性塑膜吸收光合活性辐射并传递太阳红外辐射。
The results showed that the percentage of photosynthetically active radiation (PAR) was about 80.1 in the absorption spectrum. 结果表明，冠层上方总辐射、反射辐射、基部透射辐射及吸收辐射中光合有效辐射所占百分比分别为47.
The frequency of fog occurrence has been as high as 40% of annual time and has reduced ca. 70% of the accumulated photosynthetically active radiation. 此区域一年有平均约40%25以上的时间受云雾笼罩，雾发生时林冠上光量平均降低约88%25，以年平均而言，林上光量因云雾之发生衰减约70%25。
Fill your radiator with water, or your engine will overheat. 给你的散热器充水，否则引擎会过热。
For modelling of three dimensional distribution of Photosynthetically Active Radiation (PAR) in crop canopy, the important contents of this thesis are as following. 本文的主要研究目的是建立玉米冠层内光合有效辐射(Photosynthetically Active Radiation, PAR)三维空间分布的模拟模型。