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以塔里木河荒漠河岸林的主要建群种之一柽柳为研究对象,分析了塔里木河下游不同区段、不同地下水位状况下柽柳体内叶绿素、可溶性糖、脯氨酸(PRO)、丙二醛(MDA)、超氧化物歧化酶(SOD)、过氧化物酶(POD)、生长素(IAA)、赤霉素(GA3)和脱落酸(ABA)等主要生理指标的变化特点.研究表明,这些生理指标和地下水位存在着比较密切的相关关系;在干旱胁迫条件下,柽柳通过协调自身生理代谢过程以共同抵御干旱胁迫;在塔里木河下游,柽柳正常生长的合理生态水位在2~4m,地下水埋深超过4m时,柽柳生长开始受到胁迫,6m以下则受到严重胁迫,10m为柽柳死亡的临界地下水位.这一结论为探讨荒漠植被的抗旱机理和实现塔里木河流域输水效益的最大化提供了重要依据.
Taking Tamarix asparagus, one of the main constructive species of riparian forest in the Tarim River, as the research object, the effects of chlorophyll, soluble sugar, proline (PRO), malondialdehyde (MDA) in different sections of the lower reaches of the Tarim River, MDA, SOD, POD, IAA, GA3 and ABA, etc. The results showed that these Physiological indexes are closely related to groundwater level. Under drought stress, Tamarix chinensis co-ordinates its own physiological metabolic processes to resist drought stress. In the lower reaches of the Tarim River, the reasonable ecological water level of Tamarix chinensis is between 2 and 4 m, groundwater When the depth is more than 4m, the growth of Tamarix chinensis begins to be under stress, while the depth below 6m is severely stressed and the 10m is the critical water table of Tamarix death.This conclusion provides a theoretical basis for exploring the mechanism of desert vegetation drought resistance and maximizing the water transfer benefit in the Tarim River Basin An important basis.