对Haloxylon ammodendron的功能特征的降水排除和地下水抽取的影响进行量化 - - 这种xeric灌木如何在干旱中生存?
Shensi Liu1, Guiqing Xu1, Tuqiang Chen1
1State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; Fukang Station of Desert Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Fukang 831500, China; University of Chinese Academy of Sciences, Beijing 100049, China.
The Science of the total environment
|September 12, 2023
概括
由于地下水减少而造成的水文干旱对沙漠木质植物 (如Haloxylon ammodendron) 构成的威胁比降水减少更大. 这影响了干旱地区的生态生理学和生存.
科学领域:
- 生态生态学 生态生态学
- 植物生理学 植物生理学
- 环境科学 环境科学
背景情况:
- 沙漠生态系统面临着日益严重的干旱和地下水减少,影响木质植物.
- 沙漠多年生植物的生态生理反应,特别是弗雷托菲特对联合干旱的反应是不太了解的.
研究的目的:
- 研究降水排斥和地下水深度下降对Haloxylon ammodendron多种特征的影响.
- 评估气象和水文干旱对沙漠植物的单独和综合影响.
主要方法:
- 在古尔本敦古特沙漠的两处具有对比地下水深度的地点进行了为期5年的降水排除实验.
- 监测生态生理特征,水潜力,气体交换,碳水化合物度和稳定的同位素 (δ18O).
主要成果:
- 降水排除增加了叶子的水潜力和口腔导电性,但降低了用水效率.
- 地下水的吸收减少了水的潜力,光合作用和口腔导电性,同时提高了用水效率.
- 联合干旱降低了休伯值,但没有加剧影响;水文干旱比降水变化更具破坏性.
结论:
- 地下水深度的下降 (水文干旱) 对H. ammodendron生存的威胁比降水变化更大.
- 了解这些影响对于气候变化下的干旱生态系统管理和保护至关重要.
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