Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.14843 |
Seasonal variability of forest sensitivity to heat and drought stresses: A synthesis based on carbon fluxes from North American forest ecosystems | |
Xu, Bing1,2; Arain, M. Altaf1,2; Black, T. Andrew3; Law, Beverly E.4; Pastorello, Gilberto Z.5; Chu, Housen6 | |
2019-10-26 | |
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 | Canada; USA |
英文摘要 | Climate extremes such as heat waves and droughts are projected to occur more frequently with increasing temperature and an intensified hydrological cycle. It is important to understand and quantify how forest carbon fluxes respond to heat and drought stress. In this study, we developed a series of daily indices of sensitivity to heat and drought stress as indicated by air temperature (T-a) and evaporative fraction (EF). Using normalized daily carbon fluxes from the FLUXNET Network for 34 forest sites in North America, the seasonal pattern of sensitivities of net ecosystem productivity (NEP), gross ecosystem productivity (GEP) and ecosystem respiration (RE) in response to T-a and EF anomalies were compared for different forest types. The results showed that warm temperatures in spring had a positive effect on NEP in conifer forests but a negative impact in deciduous forests. GEP in conifer forests increased with higher temperature anomalies in spring but decreased in summer. The drought-induced decrease in NEP, which mostly occurred in the deciduous forests, was mostly driven by the reduction in GEP. In conifer forests, drought had a similar dampening effect on both GEP and RE, therefore leading to a neutral NEP response. The NEP sensitivity to T-a anomalies increased with increasing mean annual temperature. Drier sites were less sensitive to drought stress in summer. Natural forests with older stand age tended to be more resilient to the climate stresses compared to managed younger forests. The results of the Classification and Regression Tree analysis showed that seasons and ecosystem productivity were the most powerful variables in explaining the variation of forest sensitivity to heat and drought stress. Our results implied that the magnitude and direction of carbon flux changes in response to climate extremes are highly dependent on the seasonal dynamics of forests and the timing of the climate extremes. |
英文关键词 | climatic stresses drought eddy covariance technique FLUXNET2015 forest carbon cycle heat wave net ecosystem productivity |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000492533100001 |
WOS关键词 | WATER-USE EFFICIENCY ; TEMPERATE PINE PLANTATION ; BLACK SPRUCE FOREST ; PONDEROSA PINE ; CLIMATE EXTREMES ; LONG-TERM ; DOUGLAS-FIR ; OLD-GROWTH ; SOIL RESPIRATION ; DECIDUOUS FOREST |
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/187794 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.McMaster Univ, Sch Geog & Earth Sci, 1280 Main St West, Hamilton, ON L8S 4K1, Canada; 2.McMaster Univ, McMaster Ctr Climate Change, Hamilton, ON, Canada; 3.Univ British Columbia, Fac Land & Food Syst, Vancouver, BC, Canada; 4.Oregon State Univ, Coll Forestry, Dept Forest Ecosyst & Soc, Corvallis, OR 97331 USA; 5.Lawrence Berkeley Natl Lab, Computat Res Div, Berkeley, CA USA; 6.Lawrence Berkeley Natl Lab, Climate & Ecosyst Sci Div, Berkeley, CA USA |
推荐引用方式 GB/T 7714 | Xu, Bing,Arain, M. Altaf,Black, T. Andrew,et al. Seasonal variability of forest sensitivity to heat and drought stresses: A synthesis based on carbon fluxes from North American forest ecosystems[J]. GLOBAL CHANGE BIOLOGY,2019. |
APA | Xu, Bing,Arain, M. Altaf,Black, T. Andrew,Law, Beverly E.,Pastorello, Gilberto Z.,&Chu, Housen.(2019).Seasonal variability of forest sensitivity to heat and drought stresses: A synthesis based on carbon fluxes from North American forest ecosystems.GLOBAL CHANGE BIOLOGY. |
MLA | Xu, Bing,et al."Seasonal variability of forest sensitivity to heat and drought stresses: A synthesis based on carbon fluxes from North American forest ecosystems".GLOBAL CHANGE BIOLOGY (2019). |
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