岷江冷杉和紫果云杉对增加温度和CO_(2)浓度的物种特异性的生长、形态和生理响应  

Species-specific growth,morphological and physiological responses of Abies faxoniana and Picea purpurea under elevated temperature and CO_(2)

作　　者：Haojie Dong Zongdi Huang Wen Li Lei Yu 

机构地区：[1]Department of Ecology,College of Life and Environmental Sciences,Hangzhou Normal University,Hangzhou 311121,China

出　　处：《Journal of Plant Ecology》2023年第1期214-228,共15页植物生态学报（英文版）

基　　金：supported by the Research Start-up Fund of Hangzhou Normal University(2018QDL055).

摘　　要：尽管许多研究评估了植物对增加的大气二氧化碳浓度(CO_(2))和增温的生理生态响应,但探究这两个因素交互作用的研究较少,尤其是更敏感的高海拔树种。为了解决这个问题,我们选用岷江冷杉(Abies faxoniana)和紫果云杉(Picea purpurea)幼苗来评估增加CO_(2)浓度(CeTa,700 ppm)、增温(CaTe,高于环境温度2°C)以及增加CO_(2)浓度和增温(CeTe)交互作用对植物生长、形态和生理的影响。我们的研究发现CaTe处理下,这两种针叶树总干重、比根长、净光合速率以及^(15)NH_(4)+和^(15)NO_(3)−的转运速率均升高,但CeTe处理下植株的响应更强烈(岷江冷杉的净光合速率除外)。这些结果表明,增加CO_(2)浓度加剧了增温对植物生长和生理反应的影响。此外,CeTe对紫果云杉生理特征的影响更大,其总干重、比叶面积、水分利用效率(δ^(13)C)、δ^(15)NO_(3)^(−)-N水平、15NH4+和15NO3−的转运速率和非结构碳水化合物浓度均高于岷江冷杉。总体而言,这些研究结果表明,在评估针叶树种对未来气候的响应时,应考虑CO_(2)×温度的交互作用。Although many studies have evaluated plant ecophysiological responses to increasing atmospheric carbon dioxide concentration(CO_(2))and increasing temperature,few studies have addressed the interactive effects of these two factors,especially on high-altitude trees that are more sensitive.To address this issue,we used Abies faxoniana and Picea purpurea seedlings to evaluate the effects of elevated CO_(2)(CeTa,700 ppm),elevated temperature(CaTe,2°C above ambient temperature)and elevated CO_(2)combined with elevated temperature(CeTe)on plant growth,morphology and physiological responses.We found that CaTe increased conifer total dry mass,specific root length,net photosynthesis rate and translocation rates of 15NH4+and^(15)NO_(3)−,but CeTe had stronger responses(except net photosynthesis rate of A.faxoniana).These results indicate that the effect of elevated temperature on the growth and physiological responses is enhanced by elevated CO_(2).Furthermore,effect of CeTe on physiological traits was higher in P.purpurea,which possessed a higher total dry mass,specific leaf area,water use efficiency(δ13C),δ^(15)NO_(3)^(−)-N level,translocation rates of ^(15)NH_(4)+and 15NO3−and total nonstructural carbohydrates than A.faxoniana.Overall,these findings suggest that the interactive effects of CO_(2)×temperature should be considered when assessing conifer responses to future climates.

关 键 词：增温 增加CO_(2)浓度 非结构性碳水化合物 15N 示踪 针叶树 

分 类 号：Q94[生物学—植物学]