草业学报2025，Vol.34Issue(7)：145-157,13.DOI:10.11686/cyxb2024333
模拟增温对河西走廊典型荒漠灌木光合作用的影响
Effects of simulated warming on photosynthesis of typical desert shrubs in the Hexi Corridor
摘要
Abstract
With global climate warming,the climate in Northwest China is becoming increasingly warm and humid.This is significantly impacting plant growth and development,and physiological-ecological processes.However,the specific effect of climate warming on the photosynthesis of desert plants is still not fully understood.In this study,typical desert shrubs of the Hexi Corridor,including Nitraria sphaerocarpa,Haloxylon ammodendron,and Caragana korshinskii,along with the desert plant Tamarix ramosissima,were grown in open top chambers(OTCs)of varying heights(1.0,1.8,and 2.3 m)to simulate increased temperatures,and the photosynthetic responses of these typical desert shrubs to warming were investigated.The results indicated that:1)During the plant growing season(April to September),the OTCs of 1.0,1.8,and 2.3 m height increased the average air temperature by 1.7,2.5,and 3.5℃,respectively;the soil temperature at 10 cm depth by 0.6,1.2,and 1.8℃,respectively,and the soil temperature at 40 cm depth by 0.8,1.2,and 1.8℃,respectively.2)Warming significantly increased the net photosynthetic rate of the C3 plants N.sphaerocarpa,T.ramosissima,and C.korshinskii,but had no significant effect on the C4 plant H.ammodendron.Under increasing temperature,the net photosynthetic rate of C.korshinskii initially decreased before increasing.3)Warming significantly increased stomatal conductance and the intercellular CO2 concentration in N.sphaerocarpa,H.ammodendron,and C.korshinskii;however,in T.ramosissima,the stomatal conductance and intercellular CO2 concentration initially increased before subsequently declining as the temperature increased.4)Warming significantly increased the transpiration rate of H.ammodendron.The transpiration rate of C.korshinskii was increased only at the highest temperature,and that of T.ramosissima exhibited a significant decrease under increased temperatures.Warming did not significantly affect the transpiration rate of N.sphaerocarpa.Warming significantly enhanced the water use efficiency of N.sphaerocarpa,T.ramosissima,and C.korshinskii,but significantly reduced that of H.ammodendron.The predawn and midday water potentials of all four plant species were significantly reduced under warming conditions.In summary,these desert plants exhibited strong adaptability to warming,with C4 plants demonstrating greater advantages over C3 plants in the high-temperature environments.Under warming conditions,the increased transpiration rate and reduced water potential of the C4 plant H.ammodendron facilitated its water absorption and stabilized photosynthesis,and the increase in stomatal conductance and intercellular CO2 concentration promoted photosynthesis in the C3 plants N.sphaerocarpa,T.ramosissima,and C.korshinskii.关键词
荒漠灌木/光合作用/模拟增温/水分利用效率/水势Key words
desert shrubs/photosynthesis/simulated warming/water use efficiency/water potential引用本文复制引用
郭彬,罗维成,单立山,安宁,刘冰..模拟增温对河西走廊典型荒漠灌木光合作用的影响[J].草业学报,2025,34(7):145-157,13.基金项目
国家自然科学基金项目(42177457)和中国科学院西部青年学者项目资助. （42177457）
