不同树龄对胡杨叶片水势与光合特征的影响  

Effects of Different Tree Ages on Leaf Water Potential and Photosynthetic Characteristics of Populus euphratica

作　　者：史智欣 武胜利[1] 管文轲[2] 韩玮 岳永江 何宇翔 SHI Zhixin;WU Shengli;GUAN Wenke;HAN Wei;YUE Yongjiang;HE Yuxiang(Xinjiang Key Laboratory of Lake Environment and Resources in Xinjiang Drought Zone, College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China;Xinjiang Academy of Forestry Sciences, Urumqi 830000, China)

机构地区：[1]新疆师范大学地理科学与旅游学院/新疆干旱区湖泊环境与资源重点实验室,乌鲁木齐830054 [2]新疆林业科学院,乌鲁木齐830000

出　　处：《新疆农业科学》2022年第5期1119-1127,共9页Xinjiang Agricultural Sciences

基　　金：新疆维吾尔自治区科技支撑专项“塔里木河中下游胡杨生态修复研究与示范”(HY-2.3)。

摘　　要：【目的】研究不同树龄对胡杨叶片水势与光合特征的影响。【方法】选取2个树龄(3 a、5 a)胡杨,分析叶水势和光合参数。【结果】(1)2种树龄胡杨在快速生长期内叶水势日进程总体上均呈“V”型,且树龄越小对应的胡杨光合能力越弱,叶水势越高;(2)树龄不同,其光合因子变化亦有所差异,其中5年生胡杨胞间CO_(2)浓度、气孔导度、水分利用效率日均值显著高于3年生(P<0.05);(3)快速生长期2个树龄胡杨叶水势均与生理因子蒸腾速率呈极显著正相关(P<0.01),且均表现由气孔限制因素引起的光合作用减弱。【结论】2个树龄胡杨叶水势的变化因树龄不同而异,不同树龄胡杨光合日变化特征差异不显著。随着树龄的增加,胡杨光合能力提升,胡杨的水分利用效率较高,生产力较高。【Objective】to reveal the effects of different tree ages on leaf water potential and photosynthetic characteristics of Populus euphraticain Xinjiang.【Methods】The leaf water potential and photosynthetic parameters of Populus euphraticaat two tree ages(3 and 5 years)were chosen for analysis.【Results】(1)The diurnal process of leaf water potential of two tree ages of Populus euphraticashowed a"V"shape in general,and the younger the tree age,the weaker the photosynthetic capacity and the higher the leaf water potential;(2)The changes of photosynthetic factors were also different with different tree ages.The daily mean values of intercellular CO_(2) concentration,stomatal conductance and water use efficiency of 5-year-old Populus euphraticawere significantly higher than those of 3-year-old Populus euphratica(P<0.05);(3)The leaf water potential of Populus euphraticaat two tree ages in the rapid growth period was significantly positively correlated with the transpiration rate of physiological factors(P<0.01),and both showed the weakening of photosynthesis caused by stomatal constraints.【Conclusion】The changes of leaf water potential of Populus euphraticaat two tree ages vary with different tree ages,and the diurnal variation characteristics of photosynthesis of Populus euphraticaat different tree ages are not significant.In general,with the increase of tree age,the photosynthetic capacity of Populus euphraticais improved,and the water use efficiency and productivity of Populus euphraticaare higher.

关 键 词：胡杨 叶水势 光合特性 不同树龄 

分 类 号：S792.119[农业科学—林木遗传育种]