More sensitive response of crown conductance to VPD and larger water consumption in tropical evergreen than in deciduous broadleaf timber trees
More sensitive response of crown conductance to VPD and larger water consumption in tropical evergreen than in deciduous broadleaf timber trees
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与落叶阔叶木树相比，热带常绿树冠导度对 VPD 的响应更敏感，耗水量更大
DOI：
10.1016/j.agrformet.2017.08.028
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发表时间：
2017-12
影响因子：
6.2
通讯作者：
Cao Kun-Fang
中科院分区：
文献类型：
--
作者：
Siddiq Zafar;Chen Ya-Jun;Zhang Yong-Jiang;Zhang Jiao-Lin;Cao Kun-Fang
冠电导敏感性（m）的差异，蒸汽压力赤字（VPD）和热带万年青和落叶树之间的耗水量还没有得到很好的理解，尽管这些信息的重要性，在经历季节性干旱和日益严重的缺水地区的种植园和水资源管理策略的发展。为此，在雨季，我们测量了60个单株树木的树干液流代表21个热带被子植物阔叶材种（11万年青和10落叶）生长在中国西南热带边缘地区的人工林。结果表明，在1 kPa VPD下，所有树种的m与参考树冠电导率（Gcref）呈极显著正相关，斜率为0.46，与理论值0.6存在显著差异，表明该树种为非等水型树种。m与树高1.3 m处的直径（胸径）呈显著正相关，但对于给定的胸径，常绿树的m显著高于落叶树。此外，全树平均日耗水量与胸径呈强正相关，但在给定的胸径，万年青树种表现出更大的耗水量比落叶树种。导管直径（木质部导水率）和边材面积也呈正相关，与胸径，万年青树种有显着较大的边材面积比落叶树种在给定的胸径。总之，我们发现1）万年青树的冠导比落叶树对VPD更敏感，2）万年青树比落叶树消耗更多的水分，部分原因是具有更高的峰值蒸腾速率和更大的边材面积（即，用于水运输和储存的较大木质部面积）。因此，我们建议，在与季节性干旱相关的热带地区，落叶树种较多的木材种植园可能被视为一种管理的可能性，以实现木材生产和水资源保护之间的平衡，即使在雨季，这需要在种植园一级进行测试。
The differences in crown conductance sensitivity (m) to vapor pressure deficit (VPD) and water consumption between tropical evergreen and deciduous tree are not well-understood despite the importance of such information for the development of plantation and water-resource management strategies in regions that experience seasonal drought and increasing water deficits. To this end, during the wet season we measured sap flow in 60 individual trees representing 21 tropical angiosperm broadleaf timber species (11 evergreen and 10 deciduous) growing in plantations in a marginal tropical area of southwestern China. The results showed thatmwas strongly correlated with reference crown conductance (Gcref) at 1 kPa VPD across all species, with a slope value of 0.46, which was significantly different from the proposed theoretical value of 0.6, suggesting the study species as anisohydric. Themwas positively correlated with tree diameter at the height of 1.3 m (diameter at breast height, DBH) but for a given DBH,mwas significantly higher in evergreens than in deciduous trees. Further, whole-tree mean daily water consumption was strongly and positively correlated with DBH, but at a given DBH, evergreen species exhibited larger water consumption than deciduous species. Vessel diameter (related to xylem hydraulic conductance) and sapwood area were also positively correlated with DBH, and evergreen species had significantly larger sapwood area than deciduous species at a given DBH. In conclusion, we found that 1) crown conductance of evergreen trees is more sensitive to VPD compared to deciduous species and 2) evergreen trees consume more water than deciduous trees, partly because of having higher peak transpiration rate and, larger sapwood area (i.e., larger xylem area for water transport and storage). Therefore, we suggest that in tropical regions associated with seasonal drought timber plantations with more deciduous species could potentially be considered as a management possibility for achieving a balance between timber production and water conservation, even in the wet season, which needs to be tested at the plantation level.
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影响因子：
5.2
作者：
Wenjun Zhang;F. Jin;A. Turner
通讯作者：
Wenjun Zhang;F. Jin;A. Turner
影响因子：
2.7
作者：
Hasselquist, Niles J.;Allen, Michael F.;Santiago, Louis S.
通讯作者：
Santiago, Louis S.
DOI：
10.1007/978-94-009-2221-1
发表时间：
1989
期刊：
--
影响因子：
--
作者：
R. W. Pearcy;J. Ehleringer;H. Mooney;P. Rundel
通讯作者：
R. W. Pearcy;J. Ehleringer;H. Mooney;P. Rundel
影响因子：
6.2
作者：
Yasunori Igarashi;T. Kumagai;N. Yoshifuji;Takanori Sato;N. Tanaka;Katsunori Tanaka;Masakazu Suzuki
通讯作者：
Yasunori Igarashi;T. Kumagai;N. Yoshifuji;Takanori Sato;N. Tanaka;Katsunori Tanaka;Masakazu Suzuki
影响因子：
7.3
作者：
Kumagai, Tomo'omi;Porporato, Amilcare
通讯作者：
Porporato, Amilcare