论文部分内容阅读
以新疆塔里木河下游极端干旱环境下天然植物多枝柽柳为研究对象,基于对气象因子、土壤水盐和多枝柽柳茎水势特性的实地监测资料,研究了影响多枝柽柳茎水势变化的主导环境因子,揭示了反映多枝柽柳生长发育期茎干水分变化的环境因子的指示性和指示阈值。结果表明:①在众多环境因子中,土壤水分对多枝柽柳茎水势变化影响最强烈,多枝柽柳对土壤水分的吸收不存在最低土壤含水率阈值,但36%的土壤含水率为影响多枝柽柳茎水势变化的临界上限,超过36%则对其没有明显影响。②土壤pH值的变化可反映极端干旱区多枝柽柳茎水势特性的变化;7.95±0.03的土壤pH值为反映多枝柽柳茎水势发生变化的临界阈值,当土壤pH值大于7.95±0.03时利于多枝柽柳有效分泌盐碱,维持正常生长。该研究为减轻多枝柽柳受旱程度、维持多枝柽柳正常生长及时补充水分提供理论依据。
Based on the field monitoring data of meteorological factors, soil water and salt and stem water potential characteristics of Tamarix ramosissima, the dominant environment that affects the stem-water potential of Tamarix ramosissima was studied using the natural plant Tamarix ramosissima under extreme drought conditions in the lower reaches of the Tarim River in Xinjiang. Factor, reveals the indicator of the environmental factors that reflect the change of stem moisture during the growth and development of T. ramosissima. The results showed that: ① Among many environmental factors, soil water had the strongest influence on stem water potential of Tamarix ramosissima. However, the minimum soil water content threshold was not absorbed by Tamarix ramosissima. However, 36% Tamarix stem water potential change of the critical upper limit, more than 36% of its no significant impact. (2) The change of soil pH value can reflect the change of stem water potential characteristics of Tamarix ramosissima in the extreme arid area. The soil pH value of 7.95 ± 0.03 is the critical threshold reflecting the change of stem water potential of Tamarix ramosissima. When the soil pH is more than 7.95 ± 0.03, Tamarix ramosissima effective secretion of salt, to maintain normal growth. The study provides the theoretical basis for alleviating the drought degree of Tamarix ramosissima, maintaining the normal growth of Tamarix ramosissima and replenishing water in time.