高寒金露梅灌丛草甸植被反射率特征

The Dynamic Features of Alpine Potentilla fruticosa Shrub Meadow Vegetation Reflectivity

根据祁连山海北高寒金露梅灌丛草甸2004年观测的太阳总辐射和反射辐射资料,分析了高寒金露梅灌丛草甸植被反射率(A)的变化特征。结果表明,金露梅灌丛草甸A在日间或一年间均表现出"U"型变化规律,晴天、昙天和阴云天气状况下的早晚略有差异,中午前后的A值三者无明显差异。季节不同下垫面性质不同的影响,A的分布不同。海北高寒金露梅灌丛草甸A的月平均在植物生长季内5～9月为0.15,植物非生长季的10月～翌年4月为0.20,年平均A为0.18。

Using the data of the solar total radiation and reflectivity measured in Haibei alpine Potentilla fruticosa shrub meadow in 2005, we analyzed the dynamics of the vegetation reflectivity （A）. The results showed that the A changes in day or year all had ＂U＂ sharp in alpine shrub meadow. There were a few differences in A values of dawn and dusk among the sunny, full-cloudy and cloudy days while no significant differences before noon and after noon. Because of the plant vegetation differences with climate changes, the A was dynamic in year. The annual mean A was 0.18 with 0.15 in plant growing season from May to September and 0.20 in non-growing season from October to following April in alpine Potentilla fruticosa shrub meadow.