Effects of different water level elevations on soil organic carbon components in the hydro-fluctuation zone of the Quzhou Wuxi River National Wetland Park Reservoir Area

BAO Xiangmei, ZHANG Xiaomian, YUE Chunlei, FANG Yaoyao, ZHANG Ming, YE Jinyou, LU Gang, ZHANG Guihua, LYU Yuanyuan, YAN Xiaojie, XU Renximou

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 0

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南京林业大学学报（自然科学版）
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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 0 DOI: 10.12302/j.issn.1000-2006.202509030

Effects of different water level elevations on soil organic carbon components in the hydro-fluctuation zone of the Quzhou Wuxi River National Wetland Park Reservoir Area

  • BAO Xiangmei1, ZHANG Xiaomian2,*, YUE Chunlei2, FANG Yaoyao2, ZHANG Ming2, YE Jinyou3, LU Gang4, ZHANG Guihua2, LYU Yuanyuan5, YAN Xiaojie3, XU Renximou6
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Abstract

【Objective】This study aimed to investigate the effects of different water level elevations on soil organic carbon and its components in the hydro-fluctuation zone, so as to provide scientific basis for soil and water conservation and carbon pool management in such areas.【Method】This study was conducted in the hydro-fluctuation zone of the Quzhou Wuxi River National Wetland Park reservoir. Stratified soil samples were collected from representative slopes at different elevations to determine their physicochemical properties and soil organic carbon (SOC) components. A comparative analysis was subsequently conducted, aimed at elucidating variations in SOC components across water-level elevations and their associated influencing factors.【Result】(1) With decreasing water-level elevation, the contents of SOC and readily oxidizable carbon (ROC) increased in each soil layer. Among these, ROC exhibited the most sensitive response and may serve as a potential early-warning indicator. (2) SOC and its components (except for microbial biomass carbon) were negatively correlated with soil bulk density (BD), and showed highly significant positive correlations with soil electrical conductivity (EC), total nitrogen (TN), ammonium nitrogen (NH4+-N), total phosphorus (TP), and the carbon-to-nitrogen ratio (C/N). This indicates that changes in soil physicochemical properties are closely associated with the accumulation process of organic carbon. (3) Redundancy analysis revealed that soil C/N, EC, TP, and TN were the primary factors explaining the variation in SOC and its components.【Conclusion】In the unvegetated hydro-fluctuation zone, SOC accumulation is mainly associated with hydrologically driven physical transport processes, and the elevation of[213, 221) m serves as a key carbon sink area within the hydro-fluctuation zone. The dynamics of soil organic carbon in this context are governed by the combined effects of variable flood duration on external carbon inputs, soil salinity heterogeneity, nutrient availability (especially of nitrogen and phosphorus), and soil physical properties.

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hydro-fluctuation zone / water level elevation / soil organic carbon / carbon component / Wuxi River Wetland

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BAO Xiangmei, ZHANG Xiaomian, YUE Chunlei, FANG Yaoyao, ZHANG Ming, YE Jinyou, LU Gang, ZHANG Guihua, LYU Yuanyuan, YAN Xiaojie, XU Renximou. Effects of different water level elevations on soil organic carbon components in the hydro-fluctuation zone of the Quzhou Wuxi River National Wetland Park Reservoir Area[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 0 https://doi.org/10.12302/j.issn.1000-2006.202509030

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