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Chinese Agricultural Science Bulletin ›› 2015, Vol. 31 ›› Issue (21): 162-166.doi: 10.11924/j.issn.1000-6850.casb15010131

Special Issue: 园艺

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Variation Characteristics of Photo-synthetically Active Radiation at Longbao, Yushu

  

  • Received:2015-01-19 Revised:2015-04-09 Accepted:2015-04-24 Online:2015-07-28 Published:2015-07-28

Abstract: In order to analyze the variation characteristics of photo-synthetically active radiation (PAR) at the source region of Yangtze River, the author used observational data of total radiation, PAR and air moisture at Longbao, Yushu, and analyzed the variation characteristics of PAR and ratio of PAR to total radiation. The results showed that annual total PAR was 13281 mol/m2, the average daily total PAR was 38.2 mol/m2, annual amplitude was 26.7 mol/m2. PAR was the highest in April and the lowest in December. Annual variation trend of PAR was similar to that of total radiation. Ratio of PAR to total radiation was 1.82-2.01 mol/MJ and was high in summer and low in winter. Ratio of PAR to total radiation was positively correlated with air moisture. Estimate equation of PAR was established based on observational data and its relative deviation was 4.35%.