Hydrologic variation of stemflow yield across co‐occurring dominant canopy trees of varying mortality
Hydrologic variation of stemflow yield across co‐occurring dominant canopy trees of varying mortality
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不同死亡率的同时存在的优势冠层树木茎流产量的水文变化
DOI：
10.1002/eco.1397
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发表时间：
2014
期刊：
影响因子：
2.6
通讯作者：
D. Levia
中科院分区：
文献类型：
--
作者：
E. E. Frost;D. Levia
由于环境变化和长期停留时间的站立死树的森林枯死的关注，有必要了解森林健康的影响，降水的重新分配森林冠层。树干茎流是森林生态系统水分和养分输入的一个关键点源。我们调查了两个共存的冠层优势物种水青冈的储水能力，茎流体积和茎流漏斗比的变化。（美国山毛榉）和北美鹅掌楸（Liriodendron tulfera L.）（黄色白杨），跨越三种不同的死亡率类别：活的、应激的（环绕的）和站立死亡。在25次降雨事件中，树干流量分布的种间差异在所有事件（U = 45 881，p < 0·0001）、落叶事件（U = 11 285，p < 0·0001）和落叶事件（U = 11 582，p < 0·0001）中均显著。茎流漏斗比率大叶鹅掌楸（26.0 ± 1.2）大于石蒜（4.9 ± 0.4）。启动茎流所需的最小降水阈值量为F. grandifolia比L. tubeifera低，活的和胁迫的比死的低。两个物种的平均茎流体积为1.5 ± 0.2 l stem-1 event-1（死茎）、89.2 ± 7.7 l stem-1 event-1（胁迫茎）和91.3 ± 8.9 l stem-1 event-1（活茎）。这项研究的结果提高了我们的理解，死亡率对降雨分配和茎流通量的影响，并可能会深入了解如何死亡率产生的因素，如害虫落叶和气候变化可能会改变在森林生态系统中的茎流关系。版权所有© 2013约翰威利父子有限公司.
Concern over forest dieback due to environmental change and the long residence times of standing dead trees necessitates understanding the impact of forest health on the redistribution of precipitation by forest canopies. Stemflow represents a critical point source input of water and nutrients to forest ecosystems. We investigate the variation in water storage capacity, stemflow volume and stemflow funnelling ratios from two co‐occurring dominant canopy species, Fagus grandifolia Ehrh. (American beech) and Liriodendron tulipifera L. (yellow poplar), across three different mortality classes: live, stressed (girdled) and standing dead. Over 25 rainfall events, interspecific differences in stemflow volume distributions were significant over all (U = 45 881, p < 0·0001), leaf‐off (U = 11 285, p < 0·0001) and leaf‐on (U = 11 582, p < 0·0001) events. Stemflow funnelling ratios were greater in F. grandifolia (26·0 ± 1·2) compared with L. tulipifera (4·9 ± 0·4). Minimum precipitation threshold amounts required to initiate stemflow were lower for F. grandifolia compared with L. tulipifera, and lower for live and stressed compared with dead. Mean stemflow volume from both species was 1·5 ± 0·2 l stem−1 event−1 from dead stems, 89·2 ± 7·7 l stem−1 event−1 from stressed stems and 91·3 ± 8·9 l stem−1 event−1 from live stems. The results of this study improve our understanding of the influence of mortality on rainfall partitioning and stemflow fluxes and may give insight into how mortality generating factors such as pest defoliation and climate change may alter stemflow relationships in forested ecosystems. Copyright © 2013 John Wiley & Sons, Ltd.