Abstract
Purpose
Research on soil organic carbon (SOC) fractions is needed in order to improve the understanding of natural processes that take place in mangroves. This study aimed to evaluate the variation of SOC fractions along a low-to-high intertidal gradient and also investigate the relationship of SOC and vegetation biomass in the mangroves of Yingluo Bay, South China.
Materials and methods
Soil samples were collected from mangrove quadrats in the different intertidal zones. Total SOC and SOC fractions (such as dissolved organic carbon (DOC) and KMnO4-oxidizable carbon (KMnO4-C)) were analyzed, and vegetation biomass was also quantified.
Results and discussion
The results showed that both the concentrations and pools of the SOC fractions increased along the low-to-high intertidal gradient. The KMnO4-C density changed from 5.66 to 8.48 t/ha, while their DOC densities increased from 465.14 to 734.41 kg/ha. Along the low-to-high intertidal gradient, vegetation biomass and some soil attributes (such as TN, SOC, and soil textural characteristics) showed similar change tendencies as the SOC fractions. Correlation and multiple stepwise regression analysis indicated that DOC was significantly controlled by SOC, while KMnO4-C was significantly regulated by both SOC and TN. Multiple stepwise regression of SOC, against the soil attributes and vegetation biomass, revealed that SOC was significantly affected by the salinity and vegetation biomass. In turn, SOC fractions would be indirectly affected by the salinity and vegetation biomass.
Conclusions
Distribution of SOC fractions showed clear spatial patterns along the low-to-high intertidal gradient. This result indicated that SOC fractions were controlled by the environmental gradients which are created by geomorphological processes.
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Acknowledgments
This work was funded by the Research Fund for the National Natural Science Foundation of China (No. 40971054, No. 51039007, and No.40901278) and the Doctoral Program of Higher Education (NO.20110171110019). We would like to thank the members of the team. In addition, the authors benefited from helpful discussions with Chuan Yuan and Ling Xiao.
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Wang, G., Guan, D., Zhang, Q. et al. Distribution of dissolved organic carbon and KMnO4-oxidizable carbon along the low-to-high intertidal gradient in a mangrove forest. J Soils Sediments 15, 2199–2209 (2015). https://doi.org/10.1007/s11368-015-1150-2
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DOI: https://doi.org/10.1007/s11368-015-1150-2