globalchange  > 气候减缓与适应
DOI: 10.1016/j.envexpbot.2018.11.014
WOS记录号: WOS:000456758200007
论文题名:
Varying responses of two Haloxylon species to extreme drought and groundwater depth
作者: Wu, Xue1,2,3; Zheng, Xin-Jun1,2,3; Li, Yan1,2; Xu, Gui-Qing1,2
通讯作者: Zheng, Xin-Jun
刊名: ENVIRONMENTAL AND EXPERIMENTAL BOTANY
ISSN: 0098-8472
EISSN: 1873-7307
出版年: 2019
卷: 158, 页码:63-72
语种: 英语
英文关键词: Physiology ; Stable isotope ; Water use ; Groundwater table ; Extreme drought
WOS关键词: ASIAN DESERT SHRUBS ; ROOTING DEPTH ; WATER-UPTAKE ; SEED-GERMINATION ; PLANT DIVERSITY ; CLIMATE-CHANGE ; USE STRATEGY ; SOIL-WATER ; IN-DEPTH ; AMMODENDRON
WOS学科分类: Plant Sciences ; Environmental Sciences
WOS研究方向: Plant Sciences ; Environmental Sciences & Ecology
英文摘要:

In the context of global change, frequent extreme droughts and artificial groundwater overexploitation have significantly changed water availability, which will have profound effects on ecosystem water balance and plant survival. However, few studies have explored the changes in physiology and water-use of desert plants caused by these emerging variations in water availability. Therefore, we investigated the photosynthesis, water potential, and water absorption of two dominant woody species (Haloxylon ammodendron and H. persicum) at three sites with different groundwater depths in the Gurbantunggut Desert of Central Asia during an extreme drought period. Our results showed that: (1) H. ammodendron exhibited more negative pre-dawn leaf water potential and lower photosynthetic capacity (-2.85 MPa, 24.19 mu mol CO2 m(-2) s(-1)) than H. persicum (-2.31 MPa, 33.92 mu mol CO2 m(-2) s(-1)) during the extreme drought period; (2) pre-dawn leaf water potential and carbon assimilation of H. ammodendron significantly decreased with declining groundwater depths, whereas those of H. persicum were barely affected; (3) both species converted to deeper but different water sources during the extreme drought period: H. ammodendron obtained 56-100% soil water from the near-groundwater layer, while H. persicum obtained 64-100% soil water from the deep soil layer; (4) the depths of water absorption constantly deepened with declining groundwater depths. Variations in water availability have led to the adjustment in plant water uptake, but this adjustment was not sufficient for the optimal physiological performance of H. ammodendron. Thus, under more intense and frequent drought events, further declines in groundwater depth could significantly inhibit growth of this species and may ultimately threaten its survival. Our findings on water use and physiological responses of dominant plant species to decreasing water availability provide a basis for predicting the future of desert plants under deteriorating water conditions.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/128477
Appears in Collections:气候减缓与适应

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作者单位: 1.Chinese Acad Sci, State Key Lab Desert & Oasis Ecol, Xinjiang Inst Ecol & Geog, Urumqi 830011, Xinjiang, Peoples R China
2.Chinese Acad Sci, Fukang Stn Desert Ecol, Xinjiang Inst Ecol & Geog, Urumqi 830011, Xinjiang, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Wu, Xue,Zheng, Xin-Jun,Li, Yan,et al. Varying responses of two Haloxylon species to extreme drought and groundwater depth[J]. ENVIRONMENTAL AND EXPERIMENTAL BOTANY,2019-01-01,158:63-72
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