globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016MS000886
Scopus记录号: 2-s2.0-85031745348
论文题名:
A Novel Diffuse Fraction-Based Two-Leaf Light Use Efficiency Model: An Application Quantifying Photosynthetic Seasonality across 20 AmeriFlux Flux Tower Sites
作者: Yan H; , Wang S; -Q; , Yu K; -L; , Wang B; , Yu Q; , Bohrer G; , Billesbach D; , Bracho R; , Rahman F; , Shugart H; H
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期:6
起始页码: 2317
结束页码: 2332
语种: 英语
英文关键词: Atmospheric radiation ; Efficiency ; Meteorology ; Models ; Plants (botany) ; Radiation ; Radiometers ; Soil moisture ; Amazon ; Diffuse radiation ; Eddy covariance ; Gross primary production ; MODIS ; Radiation effects ; analytical method ; calibration ; data interpretation ; ecosystem modeling ; eddy covariance ; irradiation ; leaf area index ; light use efficiency ; MODIS ; parameterization ; photosynthesis ; primary production ; quantitative analysis ; rainforest ; seasonality ; water availability ; Amazonia
英文摘要: Diffuse 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 (ɛmsh defined as a power function of the diffuse fraction (Df)) and sunlit leaves (ɛmsu 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. © 2017. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75724
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: China Meteorological Administration, National Meteorological Center, Beijing, China; Environmental Sciences Department, University of Virginia, Charlottesville, VA, United States; Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; Department of Geography, The George Washington University, Washington, DC, United States; Department of Civil, Environmental and Geodetic Engineering, Ohio State University, Columbus, OH, United States; Department of Biological Systems Engineering, University of Nebraska, Lincoln, NE, United States; School of Forest Resources and Conservation, University of Florida, Gainesville, FL, United States; Department of Geography, Indiana University, Bloomington, IN, United States

Recommended Citation:
Yan H,, Wang S,-Q,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,2017-01-01,9(6)
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