Leaf area controls on energy partitioning of a temperate mountain grassland.
Leaf area controls on energy partitioning of a temperate mountain grassland.
复制标题
DOI：
10.5194/bg-5-421-2008
复制
发表时间：
2008-03-20
期刊：
影响因子：
--
通讯作者：
Wohlfahrt G
中科院分区：
文献类型：
--
作者：
Hammerle A;Haslwanter A;Tappeiner U;Cernusca A;Wohlfahrt G
使用感热和潜热、土壤热通量、净辐射、地上植物质量和气象驱动力的涡流协方差通量测量的六年数据集，在斯图拜谷（奥地利）作为干草草地管理的温带山地草原上进行了能量分配研究。研究的主要发现是：（i）能量分配以潜热为主，其次是显热和土壤热通量； (ii) 与标准环境强迫相比，绿色植物物质的数量由于在植被期间的三次削减而变化很大，解释了能量分配变化中类似的、部分较大的部分； (iii) 尽管土壤可用水量减少且蒸发需求较高，但几乎没有任何迹象表明水分胁迫对能量分配有影响。 2003年夏季干旱期间。
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.