Citation
Wu, Qiaoli; Song, Conghe; Song, Jinling; Wang, Jindi; Chen, Shaoyuan; Yang, Lei; Xiang, Wenhua; Zhao, Zhonghui; & Jiang, Jie (2021). Effects of Leaf Age and Canopy Structure on Gross Ecosystem Production in a Subtropical Evergreen Chinese Fir Forest. Agricultural and Forest Meteorology, 310, 108618.Abstract
Despite the advances in technologies to derive the maximum rate of Rubisco carboxylation (Vcmax) seasonality at large-scale, factors controlling the temporal dynamics of Vcmax is largely unknown without extensive field measurements at stand scale. In addition, state-of-the-art process-based terrestrial ecosystem models had not accounted the complex canopy structure for estimating radiation interception by vegetation. Both of which could lead to uncertainties in gross ecosystem production (GEP) estimations. Here, we examined the respective and combined effects of leaf age and canopy structure on GEP by integrating the Farquhar photosynthesis model with a two-leaf (sunlit and shaded) canopy radiation interception model based on the Geometric Optical and Radiative Transfer (GORT) theory. We observed that the Vcmax of new leaves was approximately 34.4% higher than that of mature leaves. Considering the seasonal dynamics of Vcmax caused by new leaf expansion, the average bias between the modeled GEP and that derived from the eddy covariance (EC) in the growing season at 8-day temporal scale was reduced from -8% to -1%, with slightly higher correlation (from 0.9 to 0.92) and reduction in root mean squared error (from 6.0 to 3.9 g C mURL
https://doi.org/10.1016/j.agrformet.2021.108618Reference Type
Journal ArticleYear Published
2021Journal Title
Agricultural and Forest MeteorologyAuthor(s)
Wu, QiaoliSong, Conghe
Song, Jinling
Wang, Jindi
Chen, Shaoyuan
Yang, Lei
Xiang, Wenhua
Zhao, Zhonghui
Jiang, Jie