高寒湿地太阳辐射和地表反射率变化的统计学特征

Changes in Reflected Radiation and Reflectivity for Growing Season of Alpine Swamp in the Northern Qinghai

依据祁连山海北高寒湿地植物生长期观测的太阳总辐射(Eg)和反射辐射(Er)资料,分析了高寒湿地Eg和地表反射率(A)的日及季节变化特征.结果表明:祁连山海北高寒湿地,有较强的Eg,但A较低.年内1-12月Eg的平均日总量达17.3 MJ.m-2,其中植物生长期的5-9月平均日总量为20.0MJ.m-2,表现出4-7月高,冷季低的变化特征.A的日、季节变化均表现“U”型变化过程.2004年1-12月A的年平均值为0.32,植物生长季的5-9月平均值为0.18,植物非生长季的10月-翌年4月平均值为0.43.其中1月最高(0.70),7月最低(0.16).

In this paper, terrestrial reflected radiation and reflectivity changing characteristics are analyzed, based on long-term observations of total global solar radiation and albedo in the alpine swamp in Haibei area of the Qilian Mountains. It is found that there are higher total global solar radiation （E8） and lower terrestrial reflected radiation （A）. The annual mean E8 reaches 17.3 MJ·m^-2 d^-1 and the Eg averaged over growing season （from May to September） reaches 20.0 MJ·m^-2 d^-1. The changing pattern of albedo （A）, diurnal or seasonal, has a ＂U＂ shape. The mean albedo （A） is 0.32 over a year and 0.18 over the growing season, respectively, with a minimum （0. 16） in July and a maximum （0.70） in January.