不同物候期兴安落叶松净光合速率对生理生态因子的响应  

Response of Net Photosynthetic Rate of Larix gmelinii to Physiological and Ecological Factors in Different Phenophases

作　　者：关蕾 张欣 张秋良[1,3] 菅亚男 张永亮 GUAN Lei;ZHANG Xin;ZHANG Qiuliang;JIAN Ya'nan;ZHANG Yongliang(College of Forestry,Inner Mongolia Agriculural University,Hohhot 010019,China;College of Ecology and Enironment,Inner Mongolia University,Hohhot 010021,China;Greater Khingan Range Forest Eecosystem National pbervation and Research Sation,Genhe 022350,Inner Mongolia,China)

机构地区：[1]内蒙古农业大学林学院,呼和浩特010019 [2]内蒙古大学生态与环境学院,呼和浩特010021 [3]内蒙古大兴安岭森林生态系统国家野外科学观测研究站,内蒙古根河022350

出　　处：《林草资源研究》2024年第2期101-108,共8页FOREST AND GRASSLAND RESOURCES RESEARCH

基　　金：国家重大研发计划“寒温带重度退化针叶林生物多样性提升技术研究与示范”(2023YFF1304002);内蒙古科技计划项目“内蒙古大兴安岭森林生态系统固碳潜力及增汇技术研究”(2023YFDZ0026);内蒙古科技计划项目“内蒙古大兴安岭森林生态系统国家野外科学观测研究站”(2023KYPT0001)。

摘　　要：研究不同物候期兴安落叶松净光合速率(P_(n))变化及其主要影响因素,有助于更好地阐明兴安落叶松碳同化过程和机理。使用LI-6400XT便携式光合测量系统,测定兴安落叶松天然林展叶初期(LOP)、展叶盛期(LSP)和叶变色期(LDP)的净光合速率、叶片温度(T_(leaf))、气孔导度(G_(S))、胞间CO_(2)浓度(C_(i))、叶绿素含量(L_(Chl))、氮含量(L_(N))、光合有效辐射(P_(AR))、空气温度(T_(a))、大气CO_(2)浓度(C_(a))、水汽压亏缺(V_(PD))等生理生态因子,利用Pearson相关性分析和逐步回归分析,系统研究不同物候期兴安落叶松P_(n)变化特征及其与生理生态因子的关系。结果表明:1)兴安落叶松P_(n)的大小顺序为LSP>LDP>LOP,上层叶>中层叶>下层叶,差异显著;阳生叶>阴生叶,二者差异不显著。2)不同物候期兴安落叶松P_(n)与PAR、Ta、Tleaf,GS呈显著或极显著正相关,与Ci呈显著或极显著负相关。3)不同物候期、不同冠层高度兴安落叶松P_(n)对生理生态因子的响应有所差异,其主控因子是PAR、Ta和GS,此外,还受Tleaf、VPD和Ci的影响。兴安落叶松天然林在不同物候期、不同冠层高度的净光合速率存在显著性差异,在估算碳通量时,应考虑不同冠层高度叶片净光合速率的相对贡献。Studying the changes in the net photosynthetic rate(P_(n)) of Larix gmelinii in different phenophases and identifying its main influencing factors can help to elucidate the process and mechanism of carbon assimilation of Larix gmelinii.The LI-6400XT portable photosynthetic measurement system was used to measure the net photosynthetic rate, leaf temperature(T_(leaf)),stomatal conductance(G_(S)),intercellular CO_(2) concentration(C_(i)),chlorophyll content(L_(Chl)),nitrogen content(L_(N)),photosynthetic active radiation(P_(AR)),air temperature(Ta),atmospheric CO_(2) concentration(C_(a)) and vapor pressure deficit(VPD)of Larix gmelinii natural forest in the leaf opening period(LOP),leaf spreading period(LSP) and leaf discoloring period(LDP).Pearson correlation analysis and stepwise regression analysis were used to systematically study the variation characteristics of P_(n) in different phenophases of L.gmelinii and its relationship with physiological, ecological factors and material content.The results showed that: 1) The order of P_(n) of Larix gmelinii was LSP>LDP>LOP,upper leaves>middle leaves>lower leaves, and the difference was significant;sun leaves>shade leaves, the difference was not significant.2) P_(n) was significantly or extremely significantly positively correlated with P_(AR),T_(a),T_(leaf) and G_S,and significantly or extremely significantly negatively correlated with C_(i) in different phenophases of L.gmelinii.3) The response of P_(n) of Larix gmelinii to physiological and ecological factors was dissimilar in different phenophases and at different canopy heights.The main control factors were P_(AR),T_(a) and G_S.In addition, it was also affected by T_(leaf),V_(PD) and C_(i).There were significant differences in the net photosynthetic rate of L.gmelinii natural forest in different phenophases and at different canopy heights.When estimating carbon flux, the relative contribution of net photosynthetic rate of leaves at different canopy heights should be considered.

关 键 词：净光合速率 生理生态因子 不同物候期 兴安落叶松 

分 类 号：S791.22[农业科学—林木遗传育种]