Hammerle A, Haslwanter A, Tappeiner U, Cernusca A, Wohlfahrt G
Institut für Ökologie, Universität Innsbruck, Sternwartestr. 15, 6020 Innsbruck, Austria.
Biogeosciences. 2008 Mar 20;5(2). doi: 10.5194/bg-5-421-2008.
Using a six year data set of eddy covariance flux measurements of sensible and latent heat, soil heat flux, net radiation, above-ground phytomass and meteorological driving forces energy partitioning was investigated at a temperate mountain grassland managed as a hay meadow in the Stubai Valley (Austria). The main findings of the study were: (i) Energy partitioning was dominated by latent heat, followed by sensible heat and the soil heat flux; (ii) When compared to standard environmental forcings, the amount of green plant matter, which due to three cuts varied considerably during the vegetation period, explained similar, and partially larger, fractions of the variability in energy partitioning; (iii) There were little, if any, indications of water stress effects on energy partitioning, despite reductions in soil water availability in combination with high evaporative demand, e.g. during the summer drought of 2003.
利用六年的涡度协方差通量测量数据集，对奥地利施图拜山谷一片作为干草草甸管理的温带山地草原的显热和潜热、土壤热通量、净辐射、地上植物量以及气象驱动力进行了能量分配研究。该研究的主要发现如下：（i）能量分配以潜热为主导，其次是显热和土壤热通量；（ii）与标准环境强迫相比，由于在植被期进行了三次刈割，绿色植物物质的数量变化很大，其对能量分配变化的解释比例相似，部分比例更大；（iii）尽管土壤水分有效性降低，同时蒸发需求较高，例如在2003年夏季干旱期间，但几乎没有迹象表明水分胁迫对能量分配有影响。
