Hydraulic Balance of a Eucalyptus urophylla Plantation in Response to Periodic Drought in Low Subtropical China.
Hydraulic Balance of a Eucalyptus urophylla Plantation in Response to Periodic Drought in Low Subtropical China.
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DOI：
10.3389/fpls.2016.01346
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发表时间：
2016
影响因子：
5.6
通讯作者：
Huang Y
中科院分区：
文献类型：
--
作者：
Zhang Z;Zhao P;McCarthy HR;Ouyang L;Niu J;Zhu L;Ni G;Huang Y
明确栽培植物的水分调节机制对于解决气候变化对我国南亚热带森林水分循环的影响具有重要意义。研究了周期性干旱对尾叶桉人工林水分平衡的影响。在干旱期间，树木表现出较低的气孔导度（GS）和叶水势（YSL）。最大参考GS（D = 1 kPa时的GS; GSref-max）降低了22.4%。相应地，比导水率（ks）下降了45.3 - 65.6%，从雨季到旱季，这取决于树的大小。叶片气孔导度（gs）随叶水势的降低而稳定（叶水势<-1.6MPa），是桉树高水分利用效率（WUE）的主要原因。此外，气孔敏感性较低（-m = 0.53），在旱季也可能是负责高WUE，因为我们发现了一个anisohydric行为，与光合有效辐射（Q0）。较大的树木被发现更有效地利用水比小树，由于更高的敏感性，减少ksL。这也被叶片碳同位素鉴别力（Δ 13C）随树径的增加而降低所证实。然而，需要进一步的研究，以确定这些结果的普遍性，在该地区的其他桉树物种。
A clear understanding of hydraulic regulation in cultivated plants is crucial for addressing challenges to forest water cycling due to climate changes in low subtropical China. Experiments were conducted to determine the hydrologic balance of a Eucalyptus urophylla plantation in response to periodic drought. Trees displayed lower stomatal conductance (GS) and leaf water potentials (ΨL) during the dry periods. A decrease of 22.4% was found for the maximum reference GS (GS at D = 1 kPa; GSref-max). Accordingly, specific hydraulic conductivity (ks) decreased by 45.3 – 65.6% from the wet to the dry season, depending on the tree size. Fairly stable leaf stomatal conductance (gs) with decreasing ΨL (ΨL < -1.6 MPa) contributed to the high water-use efficiency (WUE) of this Eucalyptus species. Additionally, the lower stomatal sensitivity (-m = 0.53) in the dry season might also be responsible for the high WUE, since we found an anisohydric behavior that was associated with photosynthetically active radiation (Q0). Larger trees were found to use water more efficiently than small trees, due to the higher sensitivity of ks to decreasing ΨL. This was also verified by the decreasing leaf carbon isotope discrimination (Δ13C) with increasing tree diameter. However, further studies are needed to determine the universality of these results for other Eucalyptus species in this region.
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影响因子：
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作者：
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