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DOI | 10.1029/2019JD031702 |
An Adjusted Two-Leaf Light Use Efficiency Model for Improving GPP Simulations Over Mountainous Areas | |
Xie, Xinyao1,2; Li, Ainong1 | |
2020-07-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2020 |
卷号 | 125期号:13 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Recently, light use efficiency (LUE) models have been widely used for calculating gross primary productivity (GPP). Unfortunately, these models are only suitable for flat areas without considering the topographic effects on plant photosynthesis. In this study, considering the topographic controls on direct radiation, diffuse radiation, and sunlit canopy area, an adjusted model called mountainous two-leaf (MTL)-LUE is developed from the original two-leaf LUE model (TL-LUE) to improve the GPP simulations in mountainous areas. The MTL-LUE model was validated at an eddy covariance (EC) site with apparent topography in the carbon footprint area. Results showed that the daily GPP simulations from MTL-LUE (root mean square error = 1.29 gC m(-2) d(-1)) matched better with EC GPP than those from the TL-LUE model (root mean square error = 1.84 gC m(-2) d(-1)), confirming the improvement of the MTL-LUE model in mountainous areas. Moreover, results also indicated that the MTL-LUE-simulated GPP showed obvious spatial variations in the study area, suggesting that the MTL-LUE model could characterize the effects of topography on plant photosynthesis. More specifically, canopy GPP was found to decrease when slope increased in shaded terrains and has no obvious variations in different slope ranges when exposed to the sun. Furthermore, results also indicated that a moderate increase in canopy GPP would be expected when the sky clearness decreased, which depended on the gap between the GPP increase of shaded leaves and the GPP decrease of sunlit leaves. This study highlights the potential of the MTL-LUE model in improving GPP simulations in mountainous areas. |
英文关键词 | mountainous two-leaf light use efficiency model (MTL-LUE) topographic effects gross primary productivity (GPP) direct radiation diffuse radiation sunlit canopy area |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000551484700009 |
WOS关键词 | GROSS PRIMARY PRODUCTION ; EDDY COVARIANCE TECHNIQUE ; NET ECOSYSTEM EXCHANGE ; PRIMARY PRODUCTIVITY ; SOLAR-RADIATION ; CARBON-DIOXIDE ; SURFACE RADIATION ; ENERGY-BALANCE ; MODIS DATA ; TOPOGRAPHY |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/289504 |
专题 | 气候变化 |
作者单位 | 1.Chinese Acad Sci, Res Ctr Digital Mt & Remote Sensing Applicat, Inst Mt Hazards & Environm, Chengdu, Peoples R China; 2.Univ Chinese Acad Sci, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Xie, Xinyao,Li, Ainong. An Adjusted Two-Leaf Light Use Efficiency Model for Improving GPP Simulations Over Mountainous Areas[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2020,125(13). |
APA | Xie, Xinyao,&Li, Ainong.(2020).An Adjusted Two-Leaf Light Use Efficiency Model for Improving GPP Simulations Over Mountainous Areas.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,125(13). |
MLA | Xie, Xinyao,et al."An Adjusted Two-Leaf Light Use Efficiency Model for Improving GPP Simulations Over Mountainous Areas".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 125.13(2020). |
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