|Earth Science Frontiers 2011, 18(6) 72-78 DOI: ISSN: 1005-2321 CN: 11-3370/P|
|Current Issue | Archive | Search [Print] [Close]|
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
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|
|Copyright by Earth Science Frontiers|