Hydraulic prediction of drought-induced plant dieback and top-kill depends on leaf habit and growth form,Ecology Letters

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Hydraulic prediction of drought-induced plant dieback and top-kill depends on leaf habit and growth form
Ecology Letters ( IF 8.8 ) Pub Date : 2021-08-18 , DOI: 10.1111/ele.13856
Ya-Jun Chen _{1,

2,

3,

4} , Brendan Choat ₅ , Frank Sterck ₄ , Phisamai Maenpuen _{1,

6} , Masatoshi Katabuchi ₁ , Shu-Bin Zhang _{1,

3} , Kyle W Tomlinson ₇ , Rafael S Oliveira ₈ , Yong-Jiang Zhang ₉ , Jing-Xian Shen _{1,

10} , Kun-Fang Cao ₁₁ , Steven Jansen ₁₂

Affiliation

CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China.
Center of Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Yunnan, China.
Yuanjiang Savanna Ecosystem Research Station, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Yuanjiang, Yunnan, China.
Forest Ecology and Forest Management Group, Wageningen University and Research, Wageningen, the Netherlands.
Hawkesbury Institute for the Environment, Western Sydney University, Richmond, New South Wales, Australia.
University of Chinese Academy of Sciences, Beijing, China.
Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China.
Department of Plant Biology, Institute of Biology, CP6109, University of Campinas - UNICAMP, Campinas, São Paulo, Brazil.
School of Biology and Ecology, University of Maine, Orono, Maine, USA.
Institute of Ecology and Geobotany, School of Ecology and Environmental Sciences, Yunnan University, Kunming, Yunnan, China.
State Key Laboratory for Conservation and Utilization of Agro-bioresources, Guangxi Key Laboratory of Forest Ecology and Conservation, College of Forestry, Guangxi University, Nanning, China.
Institute of Systematic Botany and Ecology, Ulm University, Ulm, Germany.

Hydraulic failure caused by severe drought contributes to aboveground dieback and whole-plant death. The extent to which dieback or whole-plant death can be predicted by plant hydraulic traits has rarely been tested among species with different leaf habits and/or growth forms. We investigated 19 hydraulic traits in 40 woody species in a tropical savanna and their potential correlations with drought response during an extreme drought event during the El Niño–Southern Oscillation in 2015. Plant hydraulic trait variation was partitioned substantially by leaf habit but not growth form along a trade-off axis between traits that support drought tolerance versus avoidance. Semi-deciduous species and shrubs had the highest branch dieback and top-kill (complete aboveground death) among the leaf habits or growth forms. Dieback and top-kill were well explained by combining hydraulic traits with leaf habit and growth form, suggesting integrating life history traits with hydraulic traits will yield better predictions.

中文翻译：

干旱引起的植物枯死和顶杀的水力预测取决于叶习性和生长形式

严重干旱引起的水力衰竭导致地上枯死和整株死亡。通过植物水力性状预测枯死或全株死亡的程度很少在具有不同叶习性和/或生长形式的物种中进行测试。我们调查了热带稀树草原 40 个木本物种的 19 个水力性状及其与 2015 年厄尔尼诺 - 南方涛动期间极端干旱事件期间干旱响应的潜在相关性。植物水力性状变异主要由叶习性而非生长形式划分支持耐旱性与避免干旱的性状之间的权衡轴。在叶习性或生长形式中，半落叶树种和灌木的枝条枯死和顶杀（完全地上死亡）最高。

更新日期：2021-10-08

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