spatiotemporalpatternsofforestcarbondioxideexchangebasedonglobaleddycovariancemeasurements
XingChang Wang1; ChuanKuan Wang1; GuiRui Yu2
2008
Source Publicationscienceinchinaseriesdearthsciences
ISSN1006-9313
Volume51Issue:8Pages:1129
AbstractSpatio-temporal patterns and driving mechanisms of forest carbon dioxide (CO2) exchange are the key issues on terrestrial ecosystem carbon cycles, which are the basis for developing and validating ecosystem carbon cycle models, assessing and predicting the role of forests in global carbon balance. Eddy covariance (EC) technique, an important method for measuring energy and material exchanges between terrestrial ecosystems and the atmosphere, has made a great contribution to understanding CO2 exchanges in the biosphere during the past decade. Here, we synthesized published EC flux measurements at various forest sites in the global network of eddy flux tower sites (FLUXNET) and regional flux networks. Our objective was to explore spatio-temporal patterns and driving factors on forest carbon fluxes, i.e. net ecosystem productivity (NEP), gross primary productivity (GPP) and total ecosystem respiration (TER). Globally, forest NEP exhibited a significant latitudinal pattern jointly controlled by GPP and TER. The NEP decreased in an order of warm temperate forest > cold temperate and tropical rain forests > boreal and subalpine forests. Mean annual temperature (MAT) made a greater contribution to forest carbon fluxes than sum of annual precipitation (SAP). As MAT increased, the GPP increased linearly, whereas the TER increased exponentially, resulting in the NEP decreasing beyond an MAT threshold of 20 degrees C. The GPP, TER and NEP varied substantially when the SAP was less than 1500 mm, but tended to increase with increasing SAP. Temporal dynamics in forest carbon fluxes and determinants depended upon time scales. NEP showed a significant interannual variability mainly driven by climate fluctuations and different responses of the GPP and TER to environmental forcing. In a longer term, forest carbon fluxes had a significant age effect. The ecosystem was a net carbon source right after clear-cutting, gradually switched to a net carbon sink when the relative stand age (i.e. ratio of actual stand age to the stand rotation age) approached 0.3, and maximized carbon sequestration capacity at pre-mature or mature stand stages. This temporal pattern of NEP was correlated with stand leaf area index and associated GPP. This study highlights the significance of spatio-temporal dynamics in the CO2 exchange in forest carbon cycling studies. It is also suggested that in addition to forest biomes, interannual variations and stand age effects of forest carbon fluxes should be considered in the global carbon balance.
Language英语
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/126798
Collection生态系统网络观测与模拟院重点实验室_生态系统综合研究中心
Affiliation1.东北林业大学
2.中国科学院地理科学与资源研究所
Recommended Citation
GB/T 7714
XingChang Wang,ChuanKuan Wang,GuiRui Yu. spatiotemporalpatternsofforestcarbondioxideexchangebasedonglobaleddycovariancemeasurements[J]. scienceinchinaseriesdearthsciences,2008,51(8):1129.
APA XingChang Wang,ChuanKuan Wang,&GuiRui Yu.(2008).spatiotemporalpatternsofforestcarbondioxideexchangebasedonglobaleddycovariancemeasurements.scienceinchinaseriesdearthsciences,51(8),1129.
MLA XingChang Wang,et al."spatiotemporalpatternsofforestcarbondioxideexchangebasedonglobaleddycovariancemeasurements".scienceinchinaseriesdearthsciences 51.8(2008):1129.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[XingChang Wang]'s Articles
[ChuanKuan Wang]'s Articles
[GuiRui Yu]'s Articles
Baidu academic
Similar articles in Baidu academic
[XingChang Wang]'s Articles
[ChuanKuan Wang]'s Articles
[GuiRui Yu]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[XingChang Wang]'s Articles
[ChuanKuan Wang]'s Articles
[GuiRui Yu]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.