Precipitation has dominant influences on the variation of plant hydraulics of the native Castanopsis fargesii (Fagaceae) in subtropical China
Precipitation has dominant influences on the variation of plant hydraulics of the native Castanopsis fargesii (Fagaceae) in subtropical China
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降水对中国亚热带本土壳斗科植物水力学变化具有显着影响
DOI：
10.1016/j.agrformet.2019.02.043
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发表时间：
2019-06
影响因子：
6.2
通讯作者：
Ye Qing
中科院分区：
文献类型：
--
作者：
Liang Xingyun;He Pengcheng;Liu Hui;Zhu Shidan;Uyehara Isaac Kazuo;Hou Hao;Wu Guilin;Zhang Hui;You Zhangtian;Xiao Yiying;Ye Qing
了解气候和种内系统发育在影响植物水力学变化中的作用，可以深入了解不同栖息地的物种分布。本研究对中国亚热带地区长1800 km的西-中-东样带12个不同居群的长毛栲（castanopsis fargesiii）枝叶水力结构的10个功能性状进行了定量分析。我们还进行了系统发育分析，以测试种内系统发育在影响水力结构变化中的作用。我们发现，随着降水的减少，分支血管密度保持不变，但水力加权血管直径（Dh）下降了31.9%，导致理论水力导度（Kth）降低了74.3%。叶脉密度（VD）和气孔面积指数（SPI）分别下降14.6%和29.9%。叶胀损失点沿降水梯度也从−1.51 MPa显著下降至−2.29 MPa。此外，与水力效率相关的功能性状（即kth、Dh、VD和SPI）呈显著正相关，而性状变异和性状间相关性均不受种内系统发育的显著影响，这可以从Blomberg’s sk < 1的值以及主成分分析与系统发育主成分分析的一致性看出。研究结果表明，在降水的主要影响下，白桦枝叶的水力结构发生了显著变化，表明该亚热带树种在水力调节方面具有高度的可塑性，能够应对未来气候变化下降水的变化。
Understanding the roles of climate and intraspecific phylogeny in affecting the variation of plant hydraulics can provide insights into species distribution in different habitats. In the present study, we quantified ten functional traits characterizing branch and leaf hydraulic architecture ofCastanopsis fargesiifrom 12 populations along a precipitation gradient (1120–1690 mm y−1), covering an 1800-km-long west-center-east transect in the subtropical region of China. We also conducted phylogenetic analyses to test the role of intraspecific phylogeny in affecting the variation of hydraulic architecture. We found that, with decreasing precipitation, branch vessel density remained unchanged while hydraulically weighted vessel diameter (Dh) declined by 31.9%, leading to a 74.3% reduction in theoretical hydraulic conductance (Kth). In parallel, leaf vein density (VD) and stomatal pore area index (SPI) declined by 14.6% and 29.9%, respectively. Leaf turgor loss point also declined significantly from −1.51 to −2.29 MPa along the precipitation gradient. In addition, functional traits related to hydraulic efficiency (i.e.Kth,Dh, VD and SPI) were positively correlated, whereas both trait variation and trait-trait correlations were not significantly affected by intraspecific phylogeny, as indicated by the values of Blomberg’sK< 1 and the consistency between principle component analysis and phylogenetic principle component analysis. We conclude that, hydraulic architectures of branch and leaf inC. fargesiivaried remarkably under the primary influence of precipitation, suggesting that this subtropical tree species has a high degree of plasticity in terms of hydraulic adjustment, allowing it to cope with shifts in precipitation under future climate change.
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影响因子：
4.1
作者：
M. Olave;L. Avila;J. Sites;M. Morando
通讯作者：
M. Olave;L. Avila;J. Sites;M. Morando
影响因子：
3.7
作者：
Xihua Wang;M. Kent;Xiao-Feng Fang
通讯作者：
Xihua Wang;M. Kent;Xiao-Feng Fang
影响因子：
4
作者：
Hacke, UG;Sperry, JS;Castro, L
通讯作者：
Castro, L
影响因子：
7.3
作者：
Franks, Peter J.;Drake, Paul L.;Beerling, David J.
通讯作者：
Beerling, David J.
影响因子：
6.6
作者：
Revell, Liam J.
通讯作者：
Revell, Liam J.