Transpiration and canopy conductance dynamics of Pinus sylvestris var. mongolica in its natural range and in an introduced region in the sandy plains of Northern China
Transpiration and canopy conductance dynamics of Pinus sylvestris var. mongolica in its natural range and in an introduced region in the sandy plains of Northern China
复制标题
樟子松蒸腾作用和冠层导度动态。
DOI：
10.1016/j.agrformet.2019.107830
复制
发表时间：
2020-02
影响因子：
6.2
通讯作者：
Hao Guangyou
中科院分区：
文献类型：
--
作者：
Song Lining;Zhu Jiaojun;Zheng Xiao;Wang Kai;Lu Linyou;Zhang Xiaolin;Hao Guangyou
确定树木从自然分布区到人工引种区的蒸腾变化及其控制机制对造林和森林经营具有重要意义。本文采用树干液流测定和同期环境观测相结合的方法，对樟子松（Pinussylvestrisvar.mongolica）在天然分布区的天然林（MNF）、人工引种区的人工林（MPF）和林草地（MFG）中的蒸腾作用和冠层导度进行了定量研究。结果表明，MNF、MPF和MFG的单位叶面积蒸腾速率（EL）分别为1.0、1.4和1.7 mm d− 1，表明从自然区到引种区，由于较高的蒸发需求和冠层传导性，树木的蒸腾速率显著增加。然而，ELin的MPF显著低于MFG，这是由于MPF站点的老林分的树木密度较高。水汽压亏缺（VPD）解释了MPF的日EL比太阳辐射稍大的变化，表明MPF的蒸腾作用更受VPD的限制。MNF、MPF和MFG的冠层传导率（GL）分别为104.6、109.9和132.2 mmol m−2s− 1。此外，气孔导度随VPD的增加而显著下降，但MNF和MPF的参考冠层导度均低于MFG，说明MNF和MPF对VPD的敏感性相对较低。这些结果表明，种植园林具有较高的蒸腾速率，但相对松散的气孔调节水分流失，因此，它更容易在极端干旱年份枯死。
Determining changes in tree transpiration and its controlling mechanisms from regions of natural distribution to planted introduction are significantly important for afforestation and forest management. Here, transpiration and canopy conductance of Mongolian pine (Pinus sylvestrisvar.mongolica) in natural forest (MNF) of the natural distribution region and in plantation forest (MPF) and forest-grassland (MFG) of the planted introduction region were quantified by sap flow measurements and concurrent environmental observations. The results showed that the canopy transpiration per unit leaf area (EL) averaged 1.0, 1.4, and 1.7 mm d−1for MNF, MPF, and MFG, respectively, indicating that the transpiration rate of trees significantly increased from natural to introduction regions due to higher evaporative demand and canopy conductance. However, the significantly lowerELin MPF than in MFG was due to the higher tree density at the old stand at the MPF site. The vapor pressure deficit (VPD) explained the slightly greater variability of dailyELthan solar radiation for MPF, indicating that the transpiration of MPF was limited more by VPD than radiation. Canopy conductance (GL) averaged 104.6, 109.9 and 132.2 mmol m−2s−1for MNF, MPF, and MFG, respectively. Moreover,GLsignificantly declined with VPD, but the reference canopy conductance was lower in MNF and MPF than in MFG, indicating that MNF and MPF had relatively lower stomatal conductance sensitivities to VPD. These findings suggested that plantation forest had a high transpiration rate but relatively loose stomatal regulation upon water loss; thus, it was more susceptible to dieback during extreme drought years.
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DOI：
10.1007/s00468-018-1691-2
发表时间：
2018
期刊：
Trees - Structure and Function
影响因子：
--
作者：
Song Lining;Zhu Jiaojun;Li Mingcai;Zhang Jinxin;Li Dabo
通讯作者：
Li Dabo
最近全球变暖期间中国的突发干旱日益严重
影响因子：
4.6
作者：
Wang L;Yuan X;Xie Z;Wu P;Li Y
通讯作者：
Li Y
影响因子：
6.2
作者：
Brito, Patricia;Roberto Lorenzo, J.;Jimenez, Maria S.
通讯作者：
Jimenez, Maria S.
西北干旱内陆河流域梭梭灌丛冠层导度模拟
影响因子：
6.2
作者：
Xu Shiqin;Yu Zhongbo;Zhang Ke;Ji Xibin;Yang Chuanguo;Sudicky Edward A.
通讯作者：
Sudicky Edward A.
DOI：
10.1002/047147844x.aw57
发表时间：
2019-12
期刊：
Encyclopedia of Water
影响因子：
--
作者：
M. Todorović
通讯作者：
M. Todorović