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基于东北温带落叶阔叶林通量数据的BEPS 模型参数优化

卢伟1,范文义1*,田甜2   

  1. (1东北林业大学林学院,  哈尔滨 150040;  2国家林业局北方航空护林总站,  哈尔滨 150040)
  • 出版日期:2016-05-18

Parameter optimization of BEPS model based on the flux data of the temperate deciduous broad-leaved forest in Northeast China.

LU Wei1, FAN Wen-yi1*, TIAN Tian2   

  1. (1College of Forestry, Northeast Forestry University, Harbin 150040, China; 2Northern Aerial Forest Fire Protection Station of State Forestry Administration, Harbin 150040, China).
  • Online:2016-05-18

摘要: 控制其他参数为经验常数,利用迭代方法对主要光合作用参数最大羧化速率(Vc max) 及最大电子传递速率(Jmax)进行不同数值组合,将得到的多组模拟结果的逐日总初级生产力(GPP)分别与东北帽儿山落叶阔叶林的通量观测数据进行比较,实现对小时步长BEPSHourly模型Vc maxJmax的参数优化.结果表明: 对于东北温带落叶阔叶林,当Vc max为41.1 μmol·m-2·s-1、Jmax 为82.8 μmol·m-2·s-1时,模拟的2011年逐日GPP与观测数据比较的均方根误差(RMSE)最小,为1.10 g C·m-2·d-1,R2最高,为0.95.经过光合作用参数Vc maxJmax优化后,BEPSHourly模型能更好地模拟GPP的季节变化.

关键词:  , 总初级生产力,  ,  , BEPS模型,  , 参数优化, 最大羧化速率, 最大电子传递速率

Abstract: Keeping other parameters as empirical constants, different numerical combinations of the main photosynthetic parameters Vc max and Jmax were conducted to estimate daily GPP by using the iteration method in this paper. To optimize Vc max and Jmax in BEPSHourly model at hourly time steps, simulated daily GPP using different numerical combinations of the parameters were compared with the flux tower data obtained from the temperate deciduous broadleaved forest of the Maoershan Forest Farm in Northeast China. Comparing the simulated daily GPP with the observed flux data in 2011, the results showed that optimal Vc max and Jmax for the deciduous broadleaved forest in Northeast China were 41.1 μmol·m-2·s-1 and 82.8 μmol·m-2·s-1 respectively with the minimal RMSE and the maximum R2 of 1.10 g C·m-2·d-1 and 0.95. After Vc max and Jmax optimization, BEPSHourly model simulated the seasonal variation of GPP better.

Key words: BEPS model, gross primary productivity, maximum potential rate of electron transport., parameter optimization, maximum rate of carboxylation