Interpreting the water use strategies of plantation tree species by canopy stomatal conductance and its sensitivity to vapor pressure deficit in South China
Interpreting the water use strategies of plantation tree species by canopy stomatal conductance and its sensitivity to vapor pressure deficit in South China
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从冠层气孔导度及其对水汽压亏缺的敏感性解读华南人工林树种水分利用策略
DOI：
10.1016/j.foreco.2021.119940
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发表时间：
2022-02
影响因子：
3.7
通讯作者：
Ni GY
中科院分区：
文献类型：
--
作者：
Ouyang L;Zhao P;Rao XQ;Zhu LW;Ni GY
气孔调节控制着树木的蒸腾速率，是植物功能的核心。然而，以往的研究主要集中在干旱和半干旱地区，对于亚热带湿润地区树木如何调节其气孔响应环境变化的研究还存在不确定性。本文研究了华南丘陵区4种典型种植园树种（木荷、马占相思、尾叶桉和杉木）的蒸腾速率（El）、气孔导度（Gs）和气孔导度对水汽压亏缺的敏感性。在2018年期间收集了包括连续测量的液流和气象参数以及四个物种的生理特征在内的数据集。结果表明，针叶树C.与其它3种阔叶树种相比，杉木的E1、Gs显著降低，对VPD的敏感性较弱。我们归因于不同的水分利用和气孔行为的各种物种特异性的性状。3种阔叶树种普遍具有较高的叶面积、比叶面积（SLA）、边材面积（As）/叶面积（Al）比值和较深的根系，有利于蒸腾和气体交换。试验期间，超强台风“山竹”袭击试验点，造成叶面积大幅下降，但整株蒸腾量下降幅度较小，说明气孔调节的快速补偿效应。此外，对VPD（m值）和参比Gs的敏感性增加。mangiumandE. urophyllain干旱季节突出了它们即使在没有严格气孔控制的更干燥的条件下也能很好地发挥作用的能力。研究亚热带湿润森林典型物种Gs对环境变化的响应，将为未来气候变化下的森林管理和生态系统稳定性提供重要参考。
Stomatal regulation controls tree transpiration rate and is central to plant function. However, most previous studies that investigated the stomatal regulation of forest trees mainly focused on arid and semi-arid zones, uncertainty remains about how trees adjust their stomatal response to the changing environment in subtropical moist areas. In this study, we investigated the tree transpiration (El), canopy stomatal conductance (Gs), andGssensitivity to vapor pressure deficit (VPD) of four typical plantation tree species (Schima wallichii,Acacia mangium,Eucalyptus urophylla, andCunninghamia lanceolata) in hilly lands of South China. Datasets including the continuously measured sap flow and meteorological parameters, as well as the physiological traits of the four species, were collected during the year of 2018. Our results showed that the coniferousC. lanceolatahad significantly lowerEl,Gs, and weak sensitivity toVPDthan the other three broadleaved species. We attributed the different water use and stomatal behavior to the various species-specific traits. The three broadleaved species generally possessed higher leaf area, specific leaf area (SLA), the ratio of sapwood area (As) to leaf area (Al), and deeper root depth, facilitating their transpiration and gas exchange. During the experimental period, a super typhoon “Mangkhut” hit the research site and caused substantial decline in leaf area, while the whole tree transpiration experienced slighter decrease, indicating the rapid compensatory effect of stomatal regulation. Moreover, the increasedGssensitivity toVPD(mvalues) and referenceGsfor the introducedA. mangiumandE. urophyllain the dry season highlighted their ability to function well even under the much drier condition with no strict stomatal control. Our analyses on the response ofGsto the changing environment for typical species in the subtropical moist forests will provide important insights for forest management and ecosystem stability under future climate changes.
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影响因子：
3.7
作者：
J. Medhurst;E. Pinkard;C. Beadle;D. Worledge
通讯作者：
J. Medhurst;E. Pinkard;C. Beadle;D. Worledge
DOI：
--
发表时间：
2009
期刊：
Eucalypt Science & Technology
影响因子：
--
作者：
Xue Peng
通讯作者：
Xue Peng
影响因子：
4
作者：
Litvak, Elizaveta;McCarthy, Heather R.;Pataki, Diane E.
通讯作者：
Pataki, Diane E.
影响因子：
2.6
作者：
Ding, Junyan;Johnson, Edward A.;Martin, Yvonne E.
通讯作者：
Martin, Yvonne E.
影响因子：
6.2
作者：
Z. Kassahun;H. Renninger
通讯作者：
Z. Kassahun;H. Renninger