杨树和栓皮栎日光诱导叶绿素荧光及光能利用率的比较  

Comparison of Solar-induced Chlorophyll Fluorescence and Light Use Efficiency between Poplar and Cork

作　　者：程向芬 任成昊 张劲松[1,2] 胡美均 蒋丽娅 胡海洋 黄辉[1,2] 乔永胜[6] CHENG Xiang-fen;REN Cheng-hao;ZHANG Jin-song;HU Mei-jun;JIANG Li-ya;HU Hai-yang;HUANG Hui;QIAO Yong-sheng(Research Institute of Forestry,Chinese Academy of Forestry/Key Laboratory of Tree Breeding and Cultivation of National Forestryand Grassland Administration,Beijing 100091,China;Henan Xiaolangdi Earth Critical Zone National Research Station on the MiddleYellow River,Jiyuan 459007;School of Electrical and Mechanical Engineering,Qingdao Agricultural University,Qingdao 266109;College of Forestry,Henan Agricultural University,Zhengzhou 450002;School of Ecology and Nature Conservation,BeijingForestry University,Beijing 100083;State Owned Nanshan Forest Farm of Jiyuan City,Jiyuan 459000)

机构地区：[1]中国林业科学研究院林业研究所/国家林业和草原局林木培育重点实验室,北京100091 [2]河南黄河小浪底地球关键带国家野外科学观测研究站,济源459007 [3]青岛农业大学机电工程学院,青岛266109 [4]河南农业大学林学院,郑州450002 [5]北京林业大学生态与自然保护学院,北京100083 [6]国有济源市南山林场,济源459000

出　　处：《中国农业气象》2023年第4期295-304,共10页Chinese Journal of Agrometeorology

基　　金：科技基础资源调查专项(2021FY100701)。

摘　　要：为探究杨树与栓皮栎光合光能利用率(LUEp)和荧光光能利用率(LUEf)关系的日内变化及种间差异,从光能分配的角度进一步深入理解日光诱导叶绿素荧光(SIF)与总初级生产力(GPP)的关系,以典型落叶阔叶林树种杨树(Populus alba×Populus gllandulosa)和栓皮栎(Quercus variabilis BI.)幼苗为对象,在相同土壤水分和养分条件下,观测研究不同树种SIF、净光合速率(Pn)与LUEp/LUEf对光合有效辐射(PAR)响应的异同。结果表明:(1)SIF受PAR驱动,二者呈显著正相关关系,杨树和栓皮栎线性拟合决定系数(R2)分别为0.965和0.973,且杨树具有更高的LUEf;Pn随PAR的增加逐渐饱和,杨树光饱和点明显高于栓皮栎,分别为998.59和674μmol CO_(2)·m^(-2)·s^(-1)。(2)杨树和栓皮栎Pn均随着SIF的增大呈先上升变化,之后杨树的Pn逐渐饱和,栓皮栎则缓慢下降。(3)LUEp与LUEf呈显著负线性相关关系,LUEp/LUEf随光强的增加呈指数型逐渐下降趋势,变化规律及大小在树种间不存在明显差异。研究结果说明,在日内随PAR的升高,LUEf变化较小,而LUEp则下降明显,光能分配向碳固定的比例下降,因此,Pn在强光下饱和,SIF与GPP在日内尺度表现出指数型相关关系,且该指数型关系在树种间一致。Light use efficiency(LUE)is a key parameter connecting light absorption and carbon fixation and understanding the relationship between fluorescence and photosynthesis.Based on the absorbed energy dissipation pathways,LUE can be divided into light use efficiency of photosynthetic(LUEp)and light use efficiency of fluorescence(LUEf).The relationship between LUEp and LUEf of poplar and cork oak and the differences between species were explored in this study,to better understand the mechanism links between solar-induced chlorophyll fluorescence(SIF)and gross primary productivity(GPP)in deciduous broadleaf forests.In this study,the poplar(Populus alba×Populus gllandulosa)and cork oak(Quercus variabilis BI.)seedlings were used as the objects to measure the divergences in SIF and net photosynthetic rate(Pn)under the same soil moisture and nutrient conditions,to explore the responses of LUEp/LUEf to photosynthetically active radiation(PAR).The results showed that,(1)SIF was driven by incident PAR,SIF and PAR were significantly positively correlated.The coefficient of determination(R2)of poplar and cork oak were 0.965 and 0.973,respectively,and LUEf was higher in poplar.Pn gradually increased with increasing PAR.The light saturation point(LSP)of poplar was significantly higher than that of cork oak,which were 998.59 and 674μmolCO_(2)·m^(-2)·s^(-1),respectively.(2)Pn first increased with the increasing SIF,and then the Pn of poplar was gradually saturated,while that of cork oak continued to slowly increase.(3)LUEp and LUEf showed significant negative linear correlation,and LUEp/LUEf decreased exponentially with increasing PAR,there was no significant difference in the change pattern and amplitude between tree species.During the daytime,with the increase of PAR,LUEf changed slightly,while LUEp decreased significantly,and the proportion of light energy allocation to carbon assimilation decreased.Therefore,Pn saturated under high light intensity,SIF and GPP showed exponential correlation in intraday scale,and the exponenti

关 键 词：日光诱导叶绿素荧光 净光合速率 光能利用率 光合有效辐射 

分 类 号：S792.11[农业科学—林木遗传育种] S792.18[农业科学—林学]