Earth Science Frontiers 2011, 18(6) 72-78 DOI:     ISSN: 1005-2321 CN: 11-3370/P

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 driving mechanism
dissolved organic carbon
global change
Jiasong Fang
MO Xiang
HE Ling
SUN Xin-Ting
BI Xiang-Yang
Article by Xiang, W.
Article by Jiasong Fang
Article by Mo, X.
Article by He, L.
Article by Sun, X. T.
Article by Bi, X. Y.

Driving mechanisms for the DOC increases in surface waters released from Northern Peatlands under global change.

1. State Key Laboratory of Biogeology and Environmental Geology; China University of Geosciences(Wuhan), Wuhan 430074, China
2. Department of Natural Sciences, Hawaii Pacific University, 45045 Kamehameha Hwy. Kanoehe, HI 96744,USA


Peatlands are the most efficient terrestrial ecosystems in storing carbon,which contain approximately one third of the world’s soil carbon pool and play an important role in global carbon cycling. During the last two decades, increases in dissolved organic carbon (DOC) concentrations have been observed in freshwaters across large areas of Northern Hemisphere. It is generally considered to be related to large scale DOC releasing from Northern Peatlands. Several hypotheses have been put forward as potential driving mechanisms for the increase in DOC, including (1) changes in  temperature; (2) elevated CO2 concentrations; (3) changes in Hydrological processes; (4) Decrease in sulphur deposition. However, none of the proposed hypotheses is completely convincing. After reviewing previous studies, we proposed that the combining forces of temperature and hydrological processes under global change possibly  are the main dominant drivers of DOC change, though multiple mechanisms for rising DOC exist. 

Keywords  driving mechanism   dissolved organic carbon   peatland   global change  
Received 2011-08-30 Revised 2011-10-29 Online: 2011-11-25 
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