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Article Navigation >  Chinese Geographical Science  > 2015  >  25(2): 174-183

XI Min, KONG Fanlong, LYU Xianguo, JIANG Ming, LI Yue. Spatial Variation of Dissolved Organic Carbon in Soils of Riparian Wetlands and Responses to Hydro-geomorphologic Changes in Sanjiang Plain, China[J]. Chinese Geographical Science, 2015, 25(2): 174-183. doi: 10.1007/s11769-015-0744-3
Citation: XI Min, KONG Fanlong, LYU Xianguo, JIANG Ming, LI Yue. Spatial Variation of Dissolved Organic Carbon in Soils of Riparian Wetlands and Responses to Hydro-geomorphologic Changes in Sanjiang Plain, China[J]. Chinese Geographical Science, 2015, 25(2): 174-183. doi: 10.1007/s11769-015-0744-3
shu

Spatial Variation of Dissolved Organic Carbon in Soils of Riparian Wetlands and Responses to Hydro-geomorphologic Changes in Sanjiang Plain, China

doi: 10.1007/s11769-015-0744-3
  • 1.

    College of Chemical and Environmental Engineering, Qingdao University, Qingdao 266071, China;

  • 2.

    Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China

Funds:  Under the auspices of National Natural Science Foundation of China (No. 41101080, 41171047), Natural Science Foundation of Shandong Province (No. ZR2014DQ028)
More Information
  • Corresponding author: XI Min
  • Received Date: 2014-04-14
  • Rev Recd Date: 2014-07-02
  • Publish Date: 2015-01-27
  • Spatial variation of dissolved organic carbon (DOC) in soils of riparian wetlands and responses to hydro-geomorphologic changes in the Sanjiang Plain were analyzed through in situ collecting soil samples in the Naoli River and the Bielahong River. The results showed that the average contents of DOC for soil layer of 0-100 cm were 730.6 mg/kg, 250.9 mg/kg, 423.0 mg/kg and 333.1 mg/kg respectively from riverbed to river terrace along the transverse directions of the Naoli watershed. The content of the soil DOC was the highest in the riverbed, lower in the high floodplain and much lower in the river terrace, and it was the lowest in the low floodplain. The difference in the content and vertical distribution of DOC between the riverbed and the three riparian wetlands was significant, while it was not significant among the low floodplain, the high floodplain and the river terrace. The variability of soil DOC was related to the hydrological connectivity between different landscape position of the riparian wetlands and the adjacent stream. Extremely significant correlations were observed between DOC and total organic carbon (TOC), total iron (TFe), ferrous iron (Fe(II)) whose correlation coefficients were 0.819, -0.544 and -0.709 in riparian wetlands of the Naoli River. With the increase of wetland destruction, soil pH increased and soil DOC content changed. The correlation coefficients between soil DOC and TOC, TFe, Fe(II) also changed into 0.759, -0.686 and -0.575 respectively in the Bielahong River. Under the impact of drainage ditches, the correlations between soil DOC and TFe, Fe(II) were not obvious, while the soil pH was weakly alkaline and was negatively correlated with soil DOC in the previous high floodplain. It indicates that riparian hydro-geomorphology is the main factor that could well explain this spatial variability of soil DOC, and the agricultural environmental hydraulic works like ditching also must be considered.
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Spatial Variation of Dissolved Organic Carbon in Soils of Riparian Wetlands and Responses to Hydro-geomorphologic Changes in Sanjiang Plain, China

doi: 10.1007/s11769-015-0744-3
  • 1. College of Chemical and Environmental Engineering, Qingdao University, Qingdao 266071, China;
  • 2. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
Funds:  Under the auspices of National Natural Science Foundation of China (No. 41101080, 41171047), Natural Science Foundation of Shandong Province (No. ZR2014DQ028)
    Corresponding author: XI Min
  • Received Date: 2014-04-14
  • Rev Recd Date: 2014-07-02
  • Publish Date: 2015-01-27

Abstract: Spatial variation of dissolved organic carbon (DOC) in soils of riparian wetlands and responses to hydro-geomorphologic changes in the Sanjiang Plain were analyzed through in situ collecting soil samples in the Naoli River and the Bielahong River. The results showed that the average contents of DOC for soil layer of 0-100 cm were 730.6 mg/kg, 250.9 mg/kg, 423.0 mg/kg and 333.1 mg/kg respectively from riverbed to river terrace along the transverse directions of the Naoli watershed. The content of the soil DOC was the highest in the riverbed, lower in the high floodplain and much lower in the river terrace, and it was the lowest in the low floodplain. The difference in the content and vertical distribution of DOC between the riverbed and the three riparian wetlands was significant, while it was not significant among the low floodplain, the high floodplain and the river terrace. The variability of soil DOC was related to the hydrological connectivity between different landscape position of the riparian wetlands and the adjacent stream. Extremely significant correlations were observed between DOC and total organic carbon (TOC), total iron (TFe), ferrous iron (Fe(II)) whose correlation coefficients were 0.819, -0.544 and -0.709 in riparian wetlands of the Naoli River. With the increase of wetland destruction, soil pH increased and soil DOC content changed. The correlation coefficients between soil DOC and TOC, TFe, Fe(II) also changed into 0.759, -0.686 and -0.575 respectively in the Bielahong River. Under the impact of drainage ditches, the correlations between soil DOC and TFe, Fe(II) were not obvious, while the soil pH was weakly alkaline and was negatively correlated with soil DOC in the previous high floodplain. It indicates that riparian hydro-geomorphology is the main factor that could well explain this spatial variability of soil DOC, and the agricultural environmental hydraulic works like ditching also must be considered.

XI Min, KONG Fanlong, LYU Xianguo, JIANG Ming, LI Yue. Spatial Variation of Dissolved Organic Carbon in Soils of Riparian Wetlands and Responses to Hydro-geomorphologic Changes in Sanjiang Plain, China[J]. Chinese Geographical Science, 2015, 25(2): 174-183. doi: 10.1007/s11769-015-0744-3
Citation: XI Min, KONG Fanlong, LYU Xianguo, JIANG Ming, LI Yue. Spatial Variation of Dissolved Organic Carbon in Soils of Riparian Wetlands and Responses to Hydro-geomorphologic Changes in Sanjiang Plain, China[J]. Chinese Geographical Science, 2015, 25(2): 174-183. doi: 10.1007/s11769-015-0744-3
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