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林草资源研究 ›› 2024›› Issue (2): 101-108.doi: 10.13466/j.cnki.lczyyj.2024.02.012

• 技术应用 • 上一篇    下一篇

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

关蕾1(), 张欣1,2, 张秋良1,3(), 菅亚男1, 张永亮3   

  1. 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
  • 收稿日期:2024-02-05 修回日期:2024-04-03 出版日期:2024-04-28 发布日期:2024-09-02
  • 通讯作者: 张秋良,教授,博士,主要研究方向为森林经理学与森林生态学。Email:18686028468@163.com
  • 作者简介:关蕾,硕士研究生,主要研究方向为森林可持续经营理论与技术。Email:guanlei@emails.imau.edu.cn
  • 基金资助:
    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)

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

GUAN Lei1(), ZHANG Xin1,2, ZHANG Qiuliang1,3(), JIAN Ya’nan1, ZHANG Yongliang3   

  1. 1. College of Forestry,Inner Mongolia Agricultural University,Hohhot 010019,China
    2. College of Ecology and Environment,Inner Mongolia University,Hohhot 010021,China
    3. Greater Khingan Range Forest Ecosystem National Observation and Research Station,Genhe 022350,Inner Mongolia,China
  • Received:2024-02-05 Revised:2024-04-03 Online:2024-04-28 Published:2024-09-02

摘要:

研究不同物候期兴安落叶松净光合速率(Pn)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(Tleaf)、气孔导度(GS)、胞间CO2浓度(Ci)、叶绿素含量(LChl)、氮含量(LN)、光合有效辐射(PAR)、空气温度(Ta)、大气CO2浓度(Ca)、水汽压亏缺(VPD)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Pn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Pn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PnPARTaTleaf,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Pn对生理生态因子的响应有所差异,其主控因子是PARTaGS,此外,还受TleafVPDCi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。

关键词: 净光合速率, 生理生态因子, 不同物候期, 兴安落叶松

Abstract:

Studying the changes in the net photosynthetic rate(Pn) 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(Tleaf),stomatal conductance(GS),intercellular CO2 concentration(Ci),chlorophyll content(LChl),nitrogen content(LN),photosynthetic active radiation(PAR),air temperature(Ta),atmospheric CO2 concentration(Ca) 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 Pn in different phenophases of L.gmelinii and its relationship with physiological,ecological factors and material content.The results showed that:1) The order of Pn 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) Pn was significantly or extremely significantly positively correlated with PAR,Ta,Tleaf and GS,and significantly or extremely significantly negatively correlated with Ci in different phenophases of L.gmelinii.3) The response of Pn of Larix gmelinii to physiological and ecological factors was dissimilar in different phenophases and at different canopy heights.The main control factors were PAR,Ta and GS.In addition,it was also affected by Tleaf,VPD and Ci.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.

Key words: net photosynthetic rate, physiological and ecological factors, different phenophases, Larix gmelinii

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