山西农业大学学报（自然科学版）2026，Vol.46Issue(4)：71-81,11.DOI:10.13842/j.cnki.issn1671-8151.202604010
沙堆发育下多枝柽柳对降水变化的生理响应及适应性评价
Physiological responses and adaptability evaluation of Tamarix ramosissima to precipitation variations under different coppice dune developmental stages
摘要
Abstract
[Objective]This study aimed to explore the physiological characteristics of Tamarix ramosissima on coppice dunes at different developmental stages to natural drought and precipitation changes,and to provide a theoretical basis for studying the survival mechanisms of native plants under stress in arid desert regions.[Methods]Coppice dunes development was simulated using the coppice dunes at different developmental stages on the southwestern edge of the Gurbantünggüt Desert.Taking T.ramosissima growing on sand dunes as the research material,the response patterns of leaf antioxidant enzymes,osmoregulatory substances,photosynthetic pigments,and non-structural carbohydrates to natural drought and precipitation pulses were investi-gated.[Results](1)With the development of coppice dunes,soil water content continuously decreased.The soil water content was the lowest at the declining stage of coppice dune development.Furthermore,the catalase activity and the contents of malo-ndialdehyde,proline,and soluble protein in T.ramosissima at the declining stage were significantly higher than those at the ru-dimentary and growing stages,indicating that the plant enhanced its drought tolerance by increasing antioxidant enzyme activity and accumulating osmoregulatory substances.(2)Compared with natural drought,a 7 mm precipitation event significantly re-duced the malondialdehyde and proline contents in the leaves of T.ramosissima across all developmental stages,alleviating membrane lipid peroxidation damage and osmoregulatory stress.Three days after 7 mm precipitation event,the chlorophyll content in the leaves of T.ramosissima at the rudimentary,growing,and stable stages showed an upward trend,while three days after a 4.2 mm precipitation event,the chlorophyll content at the growing,stable,and declining stages showed a down-ward trend.(3)Structural equation modeling(SEM)showed that an increase in malondialdehyde content promoted the synthe-sis of osmoregulatory substances to repair membrane system damage.The antioxidant enzyme system maintained the stability of the photosynthetic system by positively regulating photosynthetic pigment content,thereby alleviating the inhibitory effect of water deficit on the accumulation of non-structural carbohydrates in T.ramosissima.[Conclusion]T.ramosissima on coppice dunes at different developmental stages can respond to natural drought and precipitation changes by coordinating variations in an-tioxidant enzymes,osmoregulatory substances,photosynthetic pigments,and non-structural carbohydrates.关键词
多枝柽柳/灌丛沙堆/降水脉冲/生理响应Key words
Tamarix ramosissima/Coppice dune/Precipitation pulses/Physiology response分类
农业科技引用本文复制引用
郭伟,刘凡,许延琴,周冰倩,董正武..沙堆发育下多枝柽柳对降水变化的生理响应及适应性评价[J].山西农业大学学报（自然科学版）,2026,46(4):71-81,11.基金项目
国家自然科学基金(32560395) （32560395）
新疆维吾尔自治区自然科学基金面上项目(2024D01A84) （2024D01A84）
