DOI: 10.1002/2013GB004593
Scopus记录号: 2-s2.0-84927627934
论文题名: Global patterns of ecosystem carbon flux in forests: A biometric data-based synthesis
作者: Xu B ; , Yang Y ; , Li P ; , Shen H ; , Fang J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 9 起始页码: 962
结束页码: 973
语种: 英语
英文关键词: biometric measurements
; carbon balance
; carbon cycle
; eddy covariance
; forest ecosystem
; plant production
Scopus关键词: atmosphere-biosphere interaction
; biogeochemistry
; biometry
; carbon balance
; carbon dioxide
; carbon flux
; carbon sink
; database
; eddy covariance
; forest ecosystem
; net ecosystem production
英文摘要: Forest ecosystems function as a significant carbon sink for atmospheric carbon dioxide. However, our understanding of global patterns of forest carbon fluxes remains controversial. Here we examined global patterns and environmental controls of forest carbon balance using biometric measurements derived from 243 sites and synthesized from 81 publications around the world. Our results showed that both production and respiration increased with mean annual temperature and exhibited unimodal patterns along a gradient of precipitation. However, net ecosystem production (NEP) initially increased and subsequently declined along gradients of both temperature and precipitation. Our results also indicated that ecosystem production increased during stand development but eventually leveled off, whereas respiration was significantly higher in mature and old forests than in young forests. The residual variation of carbon flux along climatic and age gradients might be explained by other factors such as atmospheric CO2 elevation and disturbances (e.g., forest fire, storm damage, and selective harvest). Heterotrophic respiration (Rh ) was positively associated with net primary production (NPP), but the Rh -NPP relationship differed between natural and planted forests: Rh increased exponentially with NPP in natural forests but tended toward saturation with increased NPP in planted forests. Comparison of biometric measurements with eddy covariance observations revealed that ecosystem carbon balance derived from the latter generated higher overall NEP estimates. These results suggest that the eddy covariance observations may overestimate the strength of carbon sinks, and thus, biometric measurements need to be incorporated into global assessments of the forest carbon balance. ©2014. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77453
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Ecology, Ministry of Education, Peking University, Beijing, China; State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Xu B,, Yang Y,, Li P,et al. Global patterns of ecosystem carbon flux in forests: A biometric data-based synthesis[J]. Global Biogeochemical Cycles,2014-01-01,28(9)