Seasonal variation in the groundwater dependency of two dominant woody species in a desert region of Central Asia
Seasonal variation in the groundwater dependency of two dominant woody species in a desert region of Central Asia
复制标题
中亚沙漠地区两种主要木本植物对地下水依赖的季节变化
DOI：
10.1007/s11104-019-04251-2
复制
发表时间：
2019-08
期刊：
影响因子：
4.9
通讯作者：
Yan Li
中科院分区：
文献类型：
--
作者：
Xue Wu;Xin-Jun Zheng;Xinwei Yin;Yue-Meng Yue;Ran Liu;Gui-Qing Xu;Yan Li
地下水是荒漠植物的重要水源，对荒漠植物的生长发育和生存有很大的影响。此外，地下水变化对沙漠植物的影响还不完全清楚。研究了中亚古尔班通古特沙漠两种优势木本植物梭梭（Haloxylon ammodendron）和梭梭（H. persicum）对地下水的依赖，并评价了它们在地下水深度下降条件下的水分利用和生理反应。利用土壤水、地下水和木质部水的氧稳定同位素以及IsoSource模型确定了两个研究物种的水源沿地下水深度梯度的季节变化。此外，还测量了植物的水势和气孔导度，以确定生理性能。(1)虽然两种植物都提取地下水，但梭梭对地下水的依赖程度更高；(2)两种植物对地下水的依赖程度存在显著的季节差异，雨季相对较低，旱季相对较高；(3)当地下水可利用性下降时，两种植物均减少地下水利用，但只有梭梭表现出显著的负生理反应。研究表明，不同水源植物对地下水深度下降的响应不同，地下水下降的影响取决于荒漠植物对地下水的依赖程度。更好地了解沙漠植物对水分可用性变化的响应对于在全球变化背景下模拟、预测和管理沙漠生态系统至关重要。
Groundwater is an important water source for plants in desert regions and greatly affects the performance and survival of desert plants. Moreover, the effects of groundwater variations on desert plants are not completely understood. This study aims to investigate the groundwater dependency of two dominant woody species (Haloxylon ammodendron and H. persicum) in the Gurbantunggut Desert of Central Asia, and evaluate their water use and physiological responses under a decline in groundwater depth. Oxygen stable isotopes of soil water, groundwater and xylem water as well as the IsoSource model were used to determine seasonal variations in the water sources of the two studied species along a groundwater depth gradient. In addition, the plant water potential and stomatal conductance were measured to determine the physiological performance. (1) Although both species extracted groundwater, H. ammodendron was much more groundwater dependent; (2) the two species exhibited significant seasonal variations in their degree of groundwater dependency, which was relatively lower in the wet season, and higher during the dry period; and (3) when the groundwater availability declined, both species reduced their groundwater use, although only H. ammodendron exhibited a significantly negative physiological response. This study demonstrated that plants with different water sources respond differently to the decline of groundwater depth and the effects of groundwater drawdowns are determined by the groundwater dependency of desert plants. A better understanding of desert plant responses to water availability variations is crucial for modeling, predicting and managing desert ecosystems in the context of global change.
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三种中亚沙漠灌木的水分利用策略及其对降雨脉冲事件的响应
影响因子：
4.9
作者：
通讯作者：
--
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：
4.9
作者：
Ellsworth, Patrick Z.;Williams, David G.
通讯作者：
Williams, David G.
影响因子：
3.2
作者：
Evaristo, Jaivime;McDonnell, Jeffrey J.;Chun, Kwok P.
通讯作者：
Chun, Kwok P.
影响因子：
2
作者：
T. Zou;Yan Li;Hao Xu;Guiqing Xu
通讯作者：
T. Zou;Yan Li;Hao Xu;Guiqing Xu