A Novel Diffuse Fraction-Based Two-Leaf Light Use Efficiency Model: An Application Quantifying Photosynthetic Seasonality Across 20 AmeriFlux Flux Tower Sites
Yan, H; Wang, SQ; Yu, KL; Wang, B; Yu, Q; Bohrer, G; Billesbach, D; Bracho, R; Rahman, F; Shugart, HH
2017
Source PublicationJOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
ISSN1942-2466
Volume9Issue:6Pages:2317-2332
AbstractDiffuse radiation can increase canopy light use efficiency (LUE). This creates the need to differentiate the effects of direct and diffuse radiation when simulating terrestrial gross primary production (GPP). Here, we present a novel GPP model, the diffuse-fraction-based two-leaf model (DTEC), which includes the leaf response to direct and diffuse radiation, and treats maximum LUE for shaded leaves (epsilon(msh) defined as a power function of the diffuse fraction (D-f)) and sunlit leaves (epsilon(msu) defined as a constant) separately. An Amazonian rainforest site (KM67) was used to calibrate the model by simulating the linear relationship between monthly canopy LUE and Df. This showed a positive response of forest GPP to atmospheric diffuse radiation, and suggested that diffuse radiation was more limiting than global radiation and water availability for Amazon rainforest GPP on a monthly scale. Further evaluation at 20 independent AmeriFlux sites showed that the DTEC model, when driven by monthly meteorological data and MODIS leaf area index (LAI) products, explained 70% of the variability observed in monthly flux tower GPP. This exceeded the 51% accounted for by the MODIS 17A2 big-leaf GPP product. The DTEC model's explicit accounting for the impacts of diffuse radiation and soil water stress along with its parameterization for C4 and C3 plants was responsible for this difference. The evaluation of DTEC at Amazon rainforest sites demonstrated its potential to capture the unique seasonality of higher GPP during the diffuse radiation-dominated wet season. Our results highlight the importance of diffuse radiation in seasonal GPP simulation.
SubtypeJournal
Subject AreaMeteorology & Atmospheric Sciences
WOS Subject ExtendedMeteorology & Atmospheric Sciences
WOS KeywordGROSS PRIMARY PRODUCTIVITY ; NET PRIMARY PRODUCTIVITY ; LEAF-AREA INDEX ; CARBON-CYCLE ; TERRESTRIAL GROSS ; ECOSYSTEM PRODUCTIVITY ; ACTIVE RADIATION ; CLIMATE-CHANGE ; VEGETATION ; FOREST
Indexed BySCI
Language英语
WOS IDWOS:000419304000004
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/43994
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Yan, H,Wang, SQ,Yu, KL,et al. A Novel Diffuse Fraction-Based Two-Leaf Light Use Efficiency Model: An Application Quantifying Photosynthetic Seasonality Across 20 AmeriFlux Flux Tower Sites[J]. JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS,2017,9(6):2317-2332.
APA Yan, H.,Wang, SQ.,Yu, KL.,Wang, B.,Yu, Q.,...&Shugart, HH.(2017).A Novel Diffuse Fraction-Based Two-Leaf Light Use Efficiency Model: An Application Quantifying Photosynthetic Seasonality Across 20 AmeriFlux Flux Tower Sites.JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS,9(6),2317-2332.
MLA Yan, H,et al."A Novel Diffuse Fraction-Based Two-Leaf Light Use Efficiency Model: An Application Quantifying Photosynthetic Seasonality Across 20 AmeriFlux Flux Tower Sites".JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS 9.6(2017):2317-2332.
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