Dynamics of dissolved organic carbon release from a permafrost wetland catchment in northeast China
| 第一作者： |
郭跃东 |
| 英文第一作者： |
Guo, Y. D. |
| 联系作者： |
宋长春 |
| 英文联系作者： |
Song, C. C. |
| 发表年度： |
2015 |
| 卷： |
531 |
| 摘要： |
A large reservoir of organic carbon is stored in the permafrost region. Therefore, understanding the export of dissolved organic carbon (DOC) from rivers in the permafrost zone is important in the context of climate change. This study investigated the dynamics of DOC export from the wetlands of the Kandu River catchment located in a cold temperate region in northeast China during the growing seasons of 2011 and 2012. Our findings indicated that subsurface flow was the primary runoff pathway that transports DOC from wetland soil to stream discharge. The organic-mineral soil structure resulted in substantial differences in water sources, as well as in DOC resources, between the flood and base flow volume during the growing seasons. The active layer depth is key, as it affects runoff generation and the DOC concentration and chemical characteristics of stream discharge. The DOC flux from our study area was estimated to be up to 1039.66 t during the growing season, which represents more than one third of the net ecosystem exchange (NEE) in wetlands. Given the expected increase in air temperature and precipitation, our results indicate that there will be an increase in the total DOC flux for the study region in the future as a result of increased DOC concentration. |
| 刊物名称： |
Journal of Hydrology |
| 参与作者： |
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