青藏高原高寒湿地地表能量分配的动态变化

依据中国通量网2005年在青藏高原高寒湿地观测的地表能量数据, 分析了青藏高原高寒湿地地表能量分配的日变化和季节动态, 及非生物因素对其的影响.结果表明,潜热通量是地表有效能量的主要消耗部分,净辐射通量和潜热通量呈现出明显的单峰式变化,分别在8月和7月达到其最大值,显热通量在8月达到最大,而后缓慢降低.降雨能显著降低能量通量的各分量.相关性分析的结果表明,净辐射通量和潜热通量与非生物要素的存在较为明显的相关性,显热通量的相关性则较差.能量平衡比率平均为50.7%,其在生长季节明显高于非生长季节.

Surface energy partitioning in alpine swamp meadow in the Qinghai Tibetan Plateau

Based on surface energy flux data measured by eddy covariance methods from China Fluxin alpine swamp meadow of the Qinghai Tibetan Plateauin 2005,the daily and seasonal dynamic of surface energy fluxes and their partitioning,as well as abiotic factors effects were analyzed.The results suggested that LE (Latent heat flux) was the largest consumer of the incoming energy.Rn (Net radiation flux) and LE showed clear seasonal variations in sharp hump and up to their maxi mums in August and July,respectively.H (Sensible heat flux) increased to its peak in August whereafter declined slowly.Precipitation could reduce the components of surface energy.As to Rn and LE,their correlations with abiotic factors were evident while it was not significant in H.Average EBR (Energy balance ratio) was 50.7 %,which was muchlarger in growing season than non-growing season.