潮汐湿地土壤碳矿化及其对电子受体响应研究进展

潮汐湿地是一种重要的湿地类型,受周期性变化的潮汐水位和盐分等特殊因子的影响,其土壤碳矿化过程亦具独特性,综述了潮汐湿地土壤碳矿化及其对电子受体响应的最新研究进展。结果表明,潮汐湿地土壤碳矿化除有氧碳矿化外,三价铁和硫酸盐还原过程主导的厌氧碳矿化也是土壤碳矿化的重要途径;潮汐湿地类型中的红树林土壤碳矿化速率高于盐沼土壤碳矿化速率,并均以二氧化碳为土壤碳矿化的主要产物;生境的差异使不同电子受体在土壤碳矿化中的作用有所不同,并受到电子受体和电子供体数量的调节;潮汐、盐分、生物干扰等是影响潮汐湿地土壤碳矿化过程的主要因子。

Research Progress in Soil Carbon Mineralization and Its Response to Electron Acceptors in Tidal Wetlands

Tidal saline wetland is one of the most important wetland types,which is influenced by the level and salinity of the tidal water. The process of soil carbon mineralization is also unique.The latest advances in studies of soil carbon mineralization and its response to electron acceptors in tidal saline wetlands were reviewed.The results showed:Besides aerobic carbon mineralization,ferric and sulfate reduction were the important pathways of carbon mineralization;The rate of soil carbon mineralization was higher in mangrove than in saltmarsh,and carbon dioxide was the main products of soil carbon mineralization;The contribution of different electron acceptors was slightly different due to habitat difference,and it was controlled by the quantity of elcetron acceptors and donors;Tide,salinity and biology disturbance were the key factors affecting the carbon mineralization of tidal saline wetland.