Abstract

The effect of climate warming on soil organic carbon (SOC) of sediment in wetlands is important for accurately projecting SOC content. Thus, understanding the mechanism influencing SOC content under climate warming is necessary. Field investigation and a laboratory incubation experiment were conducted in Hulunbeier steppe wetland during 2016 and 2017. Four types of wetland were selected to incubate with ambient temperature and temperature increased by 2.5 °C. The results showed that SOC content was negatively affected by temperature warming. The SOC content reduction in sediment caused by increasing temperature was ranged from − 2.34 to 39.52%. In addition, the content of sand, silt, total phosphorus (TP), calcium phosphate tribasic (Ca-P), total nitrogen (TN), and sediment moisture (MC) should be considered in models of SOC content in steppe wetland. However, it requires further validation, in particular how SOC content varies with warming temperatures, the duration of incubation, and other abiotic and biotic factors. These findings provide evidence that both climate warming and original characteristics of sediment can control the SOC storage dynamics in the steppe wetland.

Graphical abstract

中文翻译：

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草原湿地沉积物气候变暖下有机碳储量及其影响因素

摘要

气候变暖对湿地沉积物中土壤有机碳（SOC）的影响对于准确预测SOC含量很重要。因此，有必要了解气候变暖下影响SOC含量的机理。在2016年至2017年期间，对呼伦贝尔草原湿地进行了实地调查和实验室孵化实验。选择了四种类型的湿地进行孵化，环境温度为2.5°C。结果表明，温度升高对SOC含量有负面影响。温度升高引起的沉积物中SOC含量降低的范围为-2.34至39.52％。此外，沙子，粉砂，总磷（TP），磷酸三钙（Ca-P），总氮（TN）的含量，草原湿地土壤有机碳含量模型应考虑泥沙和水分。但是，这需要进一步验证，尤其是SOC含量如何随着温度升高，孵育持续时间以及其他非生物和生物因素而变化。这些发现提供了证据，气候变暖和沉积物的原始特征都可以控制草原湿地的SOC储存动态。