Light Response Characteristics of Canopy Photosynthesis of a Tropical Evergreen Broadleaf Forest
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摘要:
目的 研究云南省典型热带常绿阔叶林的冠层光合作用光响应特征。 方法 基于云南省景洪市普文热带常绿阔叶林通量塔从2023年3月至2024年2月的观测数据，利用Michaelis-Menten方程，以1个月为时间窗口，拟合生态系统光合作用的3个光响应特征参数（以下简称“光合参数”），并与相应时间尺度的环境因子平均值进行相关分析。 结果 热带常绿阔叶林的表观初始光能利用效率（Apparent initial light use efficiency, ɑ）和生态系统暗呼吸速率（Dark ecosystem respiration, Rd）有相似的季节变异特征，均在10月份达到最大值，2月份为最小值；最大光合速率（Maximum photosynthesis rate, Pmax）在3至5月较低，其余月份变化不明显。与ɑ、Rd和Pmax的季节变异相关性最大的环境因子分别是风速、空气相对湿度和饱和水汽压差，冠层导度也对Rd和Pmax的季节变异有一定影响。 结论 热带常绿阔叶林的3个冠层光合参数有明显的季节变异特征，风速和水分条件相比辐射和温度对光合参数的季节变异有更大影响。 Abstract:Objective To study the light response characteristics of canopy photosynthesis in a tropical evergreen broadleaf forest in Yunnan Province. Methods Based on the flux tower data observed from March 2023 to February 2024 in a tropical evergreen broadleaf forest in Puwen Town, Yunnan Province, the Michaelis-Menten equation was used to fit the three photosynthetic parameters of the ecosystems with the time windows of 1 month. And the correlation analysis between ecosystem photosynthetic parameters and environmental factors in corresponding time scale was carried out. Results The apparent initial light use efficiency (ɑ) and dark ecosystem respiration (Rd) showed similar seasonal variation characteristics, with the maximum value in October and the minimum value in February. The maximum photosynthesis rate (Pmax) from March to May was low and had no obvious change in other months. The environmental factors that are most correlated with the seasonal variations of ɑ, Rd and Pmax were wind speed, relative air humidity and vapor pressure deficit, respectively. Canopy conductance also had an apparent effect on the seasonal variation of Rd and Pmax. Conclusion Three photosynthetic parameters of the tropical evergreen broadleaf forest showed obvious seasonal variations. Rather than radiation and temperature, wind speed and water conditions had greater effects on the seasonal variations of photosynthetic parameters. -
图 1 普文热带常绿阔叶林冠层上方大气湍流功率谱和谐谱特征
注：上排为功率谱，下排为谐谱；sw、sCO2、sH2O、sT分别代表垂直风速、CO2浓度、水汽、气温的功率谱；w’CO2’ 、w’u’、w’H2O’ 、w’T’分别代表CO2浓度、垂直风速与水平风速、水汽、气温的谐谱。The upper row is the power spectrum, and the below row is the co-spectrum; sw, sCO2, sH2O, sT represent the power spectrum of vertical wind velocity, carbon dioxide concentration, water vapor and air temperature, respectively; w’CO2’, w’u’, w’H2O’, w’T’ represent the co-spectrum of carbon dioxide concentration, vertical and horizontal wind velocity, water vapor and air temperature, respectively.
Figure 1. Power spectrum and co-spectrum for atmospheric turbulence above forest canopy in a tropical evergreen broadleaf forest in Puwen Town
图 2 普文热带常绿阔叶林环境和生物因子的逐月变化（平均值±标准差）
Figure 2. Monthly variations of environmental and biological factors of a tropical evergreen broadleaf forest in Puwen Town in Yunnan Province (mean values ± standard deviation)
图 3 白天净生态系统CO2交换量对光合有效辐射的逐月响应
Figure 3. Response of net ecosystem CO2 exchange in daytime (NEEd) to photosynthetically active radiation (PAR) in each month
图 4 表观初始光能利用效率（ɑ）、最大光合速率（Pmax）和生态系统暗呼吸（Rd）的逐月变化
Figure 4. Monthly variation of apparent initial light use efficiency (ɑ), maximum photosynthesis rate (Pmax) and dark ecosystem respiration (Rd)
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