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Temporal and spatial characteristics of dissolved organic carbon in the Wujiang River,Southwest China

Acta Geochimica 2017年第4期36卷 598-604页

作者： Xi Peng Baoli Wang Yanchuang Zhao State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550002China Institute of Surface-Earth System Science Tianjin UniversityTianjin 300072China Key Laboratory of Digital Earth Science Institute of RemoteSensing and Digital EarthChinese Academy of SciencesBeijing 100094China

River systems play an important role in the global carbon cycle. Rivers transport carbon to the ocean and also affect the carbon cycle in the coastal ocean. The flux from land to the ocean is thought to be a very important part of the land carbon budget. To investigate the effect of dam-building on dissolved organic carbon(DOC)in rivers, three reservoirs of different trophic states in the Wujiang basin, Guizhou Province, were sampled twice per month between May 2011 and May 2012. Temporal and spatial distributions of DOC in the reservoirs and their released waters were studied. It was found that different factors controlled DOC in river water, reservoir water, and released water. DOC in the rivers tended to be affected by primary production. For reservoirs, the main controlling factors of DOC concentration varied by trophic state. For the mesotrophic Hongjiadu Reservoir, the effect of primary production on DOC concentration was obvious. For the eutrophic Dongfengdu Reservoir and the hypereutrophic Wujiangdu Reservoir, primary production was not significant and DOC came instead from soil and plant litter.

关键词： Carbon cycle Dissolved organic carbon dam-building effect The Wujiang River

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