草业学报2026，Vol.35Issue(1)：65-78,14.DOI:10.11686/cyxb2025073
降水变化对荒漠草原植物群落主要物种气孔形态和光合生理特性的影响
Effects of changes in precipitation on stomatal morphology and photosynthetic and physiological characteristics of major species in desert steppe plant communities
摘要
Abstract
In this study,we investigated the photosynthetic adaptation mechanisms of five dominant plant species in the desert steppe of Ningxia(Stipa breviflora,Lespedeza secalinus,Lespedeza potaninii,Convolvulus ammannii,and Polygala tenuifolia)under altered precipitation regimes.Three treatments were applied:precipitation increased by 50%(PA),natural precipitation(CK),and precipitation decreased by 50%(PR).We examined changes in leaf photosynthetic parameters,stomatal morphology,and water use efficiency(WUE)to elucidate how these plants adapt to varying water availability.The results show that desert steppe plants were able to enhance their drought tolerance by increasing the stomatal perimeter and area,thereby reducing the transpiration rate and stomatal conductance.These adaptations lowered the net photosynthetic rate(Pn)and increased the WUE.C.ammannii exhibited the highest sensitivity of Pn to changes in precipitation,with the Pn in the PA treatment being 6.65-fold that in the PR treatment,although it had the lowest WUE among the five plants.L.secalinus had the highest WUE,followed by S.breviflora and P.tenuifolia.The specific leaf area(SLA)of all species significantly increased with reduced precipitation(P<0.05).Stomatal shape also influenced drought adaptation;rounder stomata were correlated with higher WUE,whereas elongated stomata were correlated with enhanced Pn.As indicated by changes in photosynthesis and water use,the five plants were ranked from highest ecological adaptability to lowest as follows:S.breviflora>L.secalinus>P.tenuifolia>C.ammannii>L.potaninii.These findings provide theoretical insights into the management of desert steppe ecosystems under the conditions of global climate change.关键词
荒漠草原/降水变化/光合作用/气孔特征/δ13C/比叶面积Key words
desert steppe/precipitation variability/photosynthesis/stomatal characteristics/δ13C/specific leaf area引用本文复制引用
邓文辉,宋珂辰,张浩,管思雨,雍嘉仪,谢铁娜,胡海英..降水变化对荒漠草原植物群落主要物种气孔形态和光合生理特性的影响[J].草业学报,2026,35(1):65-78,14.基金项目
国家自然科学基金项目(32160406)和宁夏高等学校一流学科建设(草学学科)项目(NXYLXK2017A01)资助. （32160406）
