Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.14820 |
The response of stomatal conductance to seasonal drought in tropical forests | |
Wu, Jin1,2; Serbin, Shawn P.1; Ely, Kim S.1; Wolfe, Brett T.3; Dickman, L. Turin4; Grossiord, Charlotte4; Michaletz, Sean T.4,6,7; Collins, Adam D.4; Detto, Matteo3,5; McDowell, Nate G.4,8; Wright, S. Joseph3; Rogers, Alistair1 | |
2019-10-17 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | USA; Peoples R China; Panama; Canada |
英文摘要 | Stomata regulate CO2 uptake for photosynthesis and water loss through transpiration. The approaches used to represent stomatal conductance (g(s)) in models vary. In particular, current understanding of drivers of the variation in a key parameter in those models, the slope parameter (i.e. a measure of intrinsic plant water-use-efficiency), is still limited, particularly in the tropics. Here we collected diurnal measurements of leaf gas exchange and leaf water potential (psi(leaf)), and a suite of plant traits from the upper canopy of 15 tropical trees in two contrasting Panamanian forests throughout the dry season of the 2016 El Nino. The plant traits included wood density, leaf-mass-per-area (LMA), leaf carboxylation capacity (V-c,V-max), leaf water content, the degree of isohydry, and predawn psi(leaf). We first investigated how the choice of four commonly used leaf-level g(s) models with and without the inclusion of psi(leaf) as an additional predictor variable influence the ability to predict g(s), and then explored the abiotic (i.e. month, site-month interaction) and biotic (i.e. tree-species-specific characteristics) drivers of slope parameter variation. Our results show that the inclusion of psi(leaf) did not improve model performance and that the models that represent the response of g(s) to vapor pressure deficit performed better than corresponding models that respond to relative humidity. Within each g(s) model, we found large variation in the slope parameter, and this variation was attributable to the biotic driver, rather than abiotic drivers. We further investigated potential relationships between the slope parameter and the six available plant traits mentioned above, and found that only one trait, LMA, had a significant correlation with the slope parameter (R-2 = 0.66, n = 15), highlighting a potential path towards improved model parameterization. This study advances understanding of g(s) dynamics over seasonal drought, and identifies a practical, trait-based approach to improve modeling of carbon and water exchange in tropical forests. |
英文关键词 | carbon and water exchange leaf age leaf water potential plant traits spectroscopy stomatal conductance model stomatal slope vulnerability curve |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490762200001 |
WOS关键词 | PHOTOSYNTHETIC CAPACITY ; MESOPHYLL DIFFUSION ; HYDRAULIC TRAITS ; ATMOSPHERIC CO2 ; CARBON-DIOXIDE ; LEAF AGE ; WATER ; MODEL ; VEGETATION ; SENSITIVITY |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
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/187699 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Brookhaven Natl Lab, Environm & Climate Sci Dept, Upton, NY 11973 USA; 2.Univ Hong Kong, Sch Biol Sci, Pokfulam, Hong Kong, Peoples R China; 3.Smithsonian Trop Res Inst, Apartado, Panama; 4.Los Alamos Natl Lab, Earth & Environm Sci Div, Los Alamos, NM USA; 5.Princeton Univ, Dept Ecol & Evolut Biol, Princeton, NJ 08544 USA; 6.Univ British Columbia, Dept Bot, Vancouver, BC V6T 1Z4, Canada; 7.Univ British Columbia, Biodivers Res Ctr, Vancouver, BC V6T 1Z4, Canada; 8.Pacific Northwest Natl Lab, Richland, WA 99354 USA |
推荐引用方式 GB/T 7714 | Wu, Jin,Serbin, Shawn P.,Ely, Kim S.,et al. The response of stomatal conductance to seasonal drought in tropical forests[J]. GLOBAL CHANGE BIOLOGY,2019. |
APA | Wu, Jin.,Serbin, Shawn P..,Ely, Kim S..,Wolfe, Brett T..,Dickman, L. Turin.,...&Rogers, Alistair.(2019).The response of stomatal conductance to seasonal drought in tropical forests.GLOBAL CHANGE BIOLOGY. |
MLA | Wu, Jin,et al."The response of stomatal conductance to seasonal drought in tropical forests".GLOBAL CHANGE BIOLOGY (2019). |
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