草业学报2025，Vol.34Issue(9)：87-96,10.DOI:10.11686/cyxb2024393
干旱胁迫对珍珠猪毛菜水力特征的影响
Effect of drought stress on the hydraulic traits of Salsola passerina
摘要
Abstract
Moisture is a major limiting factor for plant survival and growth in arid zones,and reductions in available soil moisture directly affect the water transport capacity and embolism vulnerability of plants.Nevertheless,related studies on the dynamic change characteristics of hydraulic traits in desert plants under drought stress are still unclear.Therefore,in this research Salsola passerine,a dominant species in arid,semi-arid regions,was studied.Control(sufficient water supply)and drought treatments(no watering)were set up to determine the hydraulic parameters of S.passerina subjected to drought stress to different growth stages.The results demonstrated that,with increase in drought stress duration:1)the leaf specific hydraulic conductivity of S.passerina exhibited a notable decline,embolism vulnerability notably increased,and the hydraulic safety boundary showed a significant decline,while sapwood-specific hydraulic conductivity did not differ significantly between control and drought treatments;2)the water regulation responses of S.passerina subjected to drought stress exhibited a proclivity towards water-variable behavior,in comparison to the control;3)decoupling between embolism resistance and water transport efficiency of drought-treated S.passerina;4)hydraulic safety boundary and sapwood-specific hydraulic conductivity are the main adaptive traits of S.passerina in response to drought stress.Furthermore,these responses can be modulated to adapt to soil moisture changes.In conclusion,the hydraulic traits of S.passerina were significantly modified by drought stress,with higher water transport efficiency maintained at the cost of embolism vulnerability under drought stress.Thus,higher hydraulic risk exists.关键词
干旱胁迫/珍珠猪毛菜/水力性状/水力效率-安全权衡/水力策略Key words
drought stress/Salsola passerina/hydraulic traits/hydraulic efficiency-safety trade-off/hydraulic strategies引用本文复制引用
张兴隆,单立山,王红永,解婷婷,马静..干旱胁迫对珍珠猪毛菜水力特征的影响[J].草业学报,2025,34(9):87-96,10.基金项目
国家自然科学基金(32160253,U23A2061),甘肃省重点研发计划项目(22YF7FA117)和甘肃省科技重大专项计划(22ZD6FA052)资助. （32160253,U23A2061）
