Chen Yaning, Li Weihong, Zhou Honghua, Chen Yapeng, Fu Aihong, Ma Jianxin
State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 818 South Beijing Road, Urumqi, Xinjiang, 830011, China.
Int J Biometeorol. 2017 Jun;61(6):1055-1062. doi: 10.1007/s00484-016-1285-x. Epub 2017 Mar 11.
Studying the water use processes of desert riparian vegetation in arid regions and analyzing the response and adaptation strategies of plants to drought stress are of great significance for developing ecological restoration measures. Based on field monitoring and test analyses of physiological ecological indicators of dominant species (Populus euphratica and Tamarix chinensis) in the desert riparian forest in the lower reaches of the Tarim River, the water relations of P. euphratica and T. chinensis under drought stress are discussed and some water use strategies put forward. The results show that (1) concerning plant water uptake, desert riparian forests depend mainly on groundwater to survive under long-term water stress. (2) Concerning plant water distribution, the survival of P. euphratica and nearby shallow root plants is mainly due to the hydraulic lift and water redistribution of P. euphratica under drought stress. (3) Concerning plant water transport, P. euphratica sustains the survival of competitive and advantageous branches by improving their ability to acquire water while restraining the growth of inferior branches. (4) Concerning plant transpiration, the sap flow curves of daily variations of P. euphratica and T. chinensis were wide-peak sin and narrower-peak respectively. T. chinensis has better environmental adaptability.
研究干旱区荒漠河岸植被的水分利用过程，分析植物对干旱胁迫的响应及适应策略，对制定生态恢复措施具有重要意义。基于对塔里木河下游荒漠河岸林优势种（胡杨和柽柳）生理生态指标的野外监测与试验分析，探讨了干旱胁迫下胡杨和柽柳的水分关系，并提出了一些水分利用策略。结果表明：（1）在植物水分吸收方面，荒漠河岸林在长期水分胁迫下主要依靠地下水生存。（2）在植物水分分配方面，胡杨及附近浅根植物的存活主要得益于干旱胁迫下胡杨的水力提升和水分再分配。（3）在植物水分运输方面，胡杨通过提高获取水分的能力维持竞争优势枝条的存活，同时抑制劣势枝条的生长。（4）在植物蒸腾方面，胡杨和柽柳日变化的液流曲线分别为宽峰正弦和窄峰，柽柳具有更好的环境适应性。
