Plasticity in leaf-level water relations of tropical rainforest trees in response to experimental drought.
Plasticity in leaf-level water relations of tropical rainforest trees in response to experimental drought.
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DOI：
10.1111/nph.13927
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发表时间：
2016-07
期刊：
影响因子：
--
通讯作者：
Mencuccini M
中科院分区：
文献类型：
--
作者：
Binks O;Meir P;Rowland L;da Costa AC;Vasconcelos SS;de Oliveira AA;Ferreira L;Christoffersen B;Nardini A;Mencuccini M
据预测，热带地区将变得更加温暖和干燥，了解树种对干旱的敏感性对于确定气候变化对森林的风险至关重要。这项研究利用亚马逊雨林的长期干旱实验来评估六种树木属的叶水平水分关系，叶解剖及其可塑性对干旱的反应。在季节之间和地块之间（对照和穿透排除）比较变量（完全膨压时的渗透势、膨压损失点、电容、弹性模量、相对含水量和饱和含水量），从而比较性状的短期和长期可塑性。叶片解剖性状与水分关系参数的相关性，以确定是否水分关系不同的组织。主要调查结果如下：渗透调节发生在对长期干旱处理的响应中;抗旱性强的物种比干旱敏感的物种表现出更少的渗透调节;水分关系性状与组织特性相关，特别是下表皮和海绵叶肉的厚度。这些发现表明，细胞水平的水分关系性状可以适应长期的水分胁迫，并强调了将短期研究结果外推到与气候变化相关的时间尺度的局限性。
The tropics are predicted to become warmer and drier, and understanding the sensitivity of tree species to drought is important for characterizing the risk to forests of climate change. This study makes use of a long‐term drought experiment in the Amazon rainforest to evaluate the role of leaf‐level water relations, leaf anatomy and their plasticity in response to drought in six tree genera. The variables (osmotic potential at full turgor, turgor loss point, capacitance, elastic modulus, relative water content and saturated water content) were compared between seasons and between plots (control and through‐fall exclusion) enabling a comparison between short‐ and long‐term plasticity in traits. Leaf anatomical traits were correlated with water relation parameters to determine whether water relations differed among tissues. The key findings were: osmotic adjustment occurred in response to the long‐term drought treatment; species resistant to drought stress showed less osmotic adjustment than drought‐sensitive species; and water relation traits were correlated with tissue properties, especially the thickness of the abaxial epidermis and the spongy mesophyll. These findings demonstrate that cell‐level water relation traits can acclimate to long‐term water stress, and highlight the limitations of extrapolating the results of short‐term studies to temporal scales associated with climate change.
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影响因子：
7.3
作者：
Buckley, Thomas N.
通讯作者：
Buckley, Thomas N.
影响因子：
30.7
作者：
Boisier, Juan P.;Ciais, Philippe;Guimberteau, Matthieu
通讯作者：
Guimberteau, Matthieu
影响因子：
4
作者：
ABRAMS, MD
通讯作者：
ABRAMS, MD
影响因子：
6.9
作者：
ANDERSEN, MN;JENSEN, CR;LOSCH, R
通讯作者：
LOSCH, R
影响因子：
2.7
作者：
Hao, Guang-You;Hoffmann, William A.;Goldstein, Guillermo
通讯作者：
Goldstein, Guillermo