Water relations and photosynthetic water use efficiency as indicators of slow climate change effects on trees in a tropical mountain forest in South Ecuador
Water relations and photosynthetic water use efficiency as indicators of slow climate change effects on trees in a tropical mountain forest in South Ecuador
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水关系和光合水利用效率作为气候变化对厄瓜多尔南部热带山林树木缓慢影响的指标
DOI：
10.1016/j.ecolind.2016.12.021
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发表时间：
2017
影响因子：
6.9
通讯作者：
Beck E
中科院分区：
文献类型：
--
作者：
Strobl S;Cueva E;Silva B;Knüsting J;Schorsch M;Scheibe R;Bendix J;Beck E
使用每日总耗水量（TWC）和瞬时水分利用效率（WUE，光合二氧化碳吸收与蒸腾损失水量之比）作为生态生理指标，研究了厄瓜多尔南部安第斯山脉热带物种丰富的山地雨林中水分增加对树木的影响。两种冠层树种和一种亚冠层树种（Vismia tomentosa，Clusiaceae，一种目前未知的樟科植物，以及Spirotheca Rosea，Bombacaceae）是实验对象。季节变化以及降水量增加的长期（18 个月）趋势导致树木的TWC 出现逆反应。由于土壤的永久高含水量向树木提供相当无限的水分，蒸腾作用主要遵循大气对水蒸气的需求，并且增加水分从而减少蒸腾作用的水损失。据推测，尽管蒸腾水损失减少，但由于水利用效率的提高，光合作用碳的获取不会受到或较少受到影响。光合净 CO2 吸收的同步测量显示 WUE inV 的预期增加。 tomentosa和S.rosea，但Lauracee没有明显反应。茎延伸生长的伴随测量证实了 V 的生长没有减弱。绒毛和 S. Roseabut 还显示，在最潮湿的月份里，Lauracee 的生长会暂停。虽然可以通过散热技术连续监测 TWC，但在需要进入树冠的活动中，WUE 是通过叶片孔隙测定法确定的。对其中一棵实验树（V. tomentosa）树冠 4 个不同位置的叶子气体交换的同时记录表明，WUE 性状与每日总耗水量相结合，可以作为评估树木对气候微妙变化的反应的指标集。然而，并非所有树种都是同样有用的指示树。
The effects of an increasing moisture on trees of the tropical species-rich mountain rain forest in the South Ecuadorian Andes was investigated, using the daily total water consumption (TWC) and the instantaneous water use efficiency (WUE, ratio of photosynthetic CO2uptake per water loss by transpiration) as ecophysiological indicators. Two canopy and one sub-canopy tree species, (Vismia tomentosa, Clusiaceae, an as of yet unknown Lauracee, andSpirotheca rosea, Bombacaceae) were the experimental objects. Seasonal changes as well as a long-term (18 months) trend of increasing precipitation caused an inverse reaction of the TWC of the trees. Because of a rather unlimited water supply to the trees from a permanently high water content of the soil, transpiration followed mainly the atmospheric demand of water vapor, and increasing moisture hence reduced water loss by transpiration. It was hypothesized that in spite of the reduction in transpiratory water loss photosynthetic carbon acquisition would be not or less affected due to an increase in water use efficiency. Concomitant measurements of photosynthetic net CO2uptake showed the expected increase of WUE inV. tomentosaandS.rosea, but no clear reaction of the Lauracee. Accompanying measurements of stem extension growth confirmed an undiminished growth ofV. tomentosaandS. roseabut showed also suspended growth of the Lauracee during the wettest months. While TWC can be continuously monitored with the heat dissipation technique, WUE is determined by leaf porometry in campaigns for which access to the canopy is required. Simultaneous recordings of the gas exchange of leaves at 4 different positions in the crown of one of the experimental trees (V. tomentosa) showed the usability of the trait WUE in combination with the total daily water consumption as indicator set for assessing the response of trees to a subtly changing climate. However, not all tree species appear as likewise useful indicator trees.
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影响因子：
1.4
作者：
Fries, Andreas;Rollenbeck, Ruetger;Bendix, Joerg
通讯作者：
Bendix, Joerg
影响因子：
6.9
作者：
Skillman, John B.
通讯作者：
Skillman, John B.
生态系统（旧金山生物珍藏）
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
E. Beck;F. Makeschin;F. Haubrich;M. Richter;J. Bendix;C. Valerezo
通讯作者：
C. Valerezo
埃塞俄比亚南部天然和外来森林冠层对罗汉松幼树生长的“防护树效应”分析
DOI：
10.1007/s00468-011-0554-x
发表时间：
2011
期刊：
Trees
影响因子：
--
作者：
Simone Strobl;M. Fetene;E. Beck
通讯作者：
E. Beck
影响因子：
1.1
作者：
Bendix, J;Rollenbeck, R;Cermak, J
通讯作者：
Cermak, J