胡杨和灰胡杨克隆生长及光合生理的差异  

Differences in clonal growth and photosynthetic physiology between Populus euphratica Oliv.and Populus pruinosa Schrenk

作　　者：李秀 陈向向 翟军团 李志军[1,2] LI Xiu;CHEN Xiang-xiang;ZHAI Jun-tuan;LI Zhi-jun(Key Laboratory of Biological Resource Protection and Utilization of Tarim Basin,Xinjiang Production and Construction Group,Alar 843300,Xinjiang,China;College of Life Sciences,Tarim University,Alar 843300,Xinjiang,China)

机构地区：[1]新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室,新疆阿拉尔843300 [2]塔里木大学生命科学学院,新疆阿拉尔843300

出　　处：《生态学杂志》2021年第7期1997-2004,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金新疆联合基金重点项目(U1803231);国家自然科学基金项目(31260072);新疆生产建设兵团重点领域创新团队建设计划(2018CB003)资助。

摘　　要：以新疆阿拉尔市人工胡杨、灰胡杨混交林为研究区,比较不同地下水位生境条件下胡杨和灰胡杨种间及种内克隆生长和光合生理的差异。结果表明:同一生境条件下种间相比较,胡杨和灰胡杨克隆分株生长指标仅在叶面积、叶干重之间存在显著差异,灰胡杨的叶面积、叶干重均显著高于胡杨;灰胡杨克隆分株净光合速率、气孔导度、蒸腾速率及CO_(2)利用效率均显著高于胡杨;不同生境条件下种内相比较,胡杨、灰胡杨克隆分株的每丛分株基径、株高、叶片数、叶面积、茎干重及叶干重在地下水位1.5 m的生境显著高于地下水位2.6 m生境,而每丛分株数、比叶面积与之相反;低地下水位生境中的胡杨克隆分株气孔导度、胞间CO_(2)浓度和灰胡杨克隆分株净光合速率、水分利用效率显著高于高地下水位生境。综合分析,同一生境下,灰胡杨克隆分株对光资源的获取能力较胡杨克隆分株更强;不同生境下,胡杨、灰胡杨克隆分株生长、光合生理特性的差异与地下水埋深度有关。We compared the interspecific and intraspecific clonal growth and photosynthetic physiology of Populus euphratica Oliv.and Populus pruinosa Schrenk in the mixed forest in different groundwater-level habitats in Alar,Xinjiang,China.Under the same habitat,Populus euphratica and Populus pruinosa differed in leaf area and dry weight of ramets.The leaf area and leaf dry weight of Populus pruinosa were significantly higher than those of Populus euphratica,while the net photosynthetic rate,stomatal conductance,transpiration rate and CO_(2)utilization efficiency of the ramets of Populus pruinosa were significantly higher than those of Populus euphratica.Across different habitats,basal diameter,plant height,leaf number,leaf area,stem dry weight and leaf dry weight of each clump of the ramets of both species were significantly higher in the habitat of 1.5 m groundwater level than in the habitat of 2.6 m groundwater level,whereas the number of branches per clump and the specific leaf area were opposite.The stomatal conductance,intercellular CO_(2)concentration,net photosynthetic rate,and water use efficiency of Populus euphratica ramets in the habitat with low groundwater level were significantly higher than those in the habitat with high groundwater level.Collectively,under the same habitats,Populus pruinosa ramets had a stronger ability to acquire light resources than Populus euphratica ramets.Under different habitats,the differences in the growth and photosynthetic physiological characteristics in both Populus euphratica and Populus pruinosa ramets were related to groundwater depth.

关 键 词：混交林 克隆分株 生长特征 光合生理 

分 类 号：S792.11[农业科学—林木遗传育种]