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《Acta Agrestia Sinica》 2002-01
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The Study of Reflective Radiation and Surface Albedo of Alpine Meadow Vegetation

LI Ying nian,ZHAO Xin quan,CAO Guang min,SHI Sheng bo (Northwest Plateau Institute of Biology, the Chinese Academy of Sciences, Xining Qinghai 810001, China)  
The Sun total radiation (Eg) and surface reflective radiation (Er) were higher in Haibei alpine meadow area of Qilian mountain. The Eg and Er were 4227.049 MJ·m -2 , 973.556 MJ·m -2 respectively, during plant growing season (from April to October) by the analysis of observed data in 2000. The Eg and Er had obvious diurnal change pattern. The instant maximum of Eg and Er appeared about from 13:00 to 14:00, and were more than 1200 W·m -2 and 220 W·m -2 , respectively. The change of Eg was influenced not only by suns altitude but also by weather and climate in seasonal change during plant growing period. The Eg was higher if suns altitude was more and climate was dry, whereas the change of Er was followed by change of Eg. The Eg and Er reached the maximum in July, then in May. The Eg and Er were lower because of wet climate during the later plant growing period. The soil surface albedo (A) showed as a "U" type change not only in a day but in seasonal change during plant growing period. The minimum of the soil surface albedo was 0.19, appeared at noon about in a day. The minimum of the soil surface albedo was about 0.21, appeared from May to June during the process of seasonal change, and it will decreased to 0.21, too, in other seasons if soil moisture was different. The average soil surface albedo was about 0.23 in Haibei alpine meadow area of Qilian mountain druing whole plant growing period.
【Fund】: 国家基础研究规划项目 (19980 40 80 0 ) ;; 中国科学院知识创新工程项目 (KSCX2 -1-0 7) ;; 中国生态网络研究长期监测;; 中国科学院海北高寒草甸生态系统定位站基金资助
【CateGory Index】: S812.1
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