影响土壤有机碳含量和组分及其稳定性的关键因素

Key factors influencing soil organic carbon content and composition and its stability

土壤有机碳在调节气候变化和生态系统方面起到了关键作用,因此维持或提高土壤有机碳的稳定性具有重要的理论和实践意义。目前随着研究的深入,土壤有机碳稳定的研究方式不断更新,且其关键影响机制尚不明确。因此本文总结了目前研究中土壤有机碳的四种分组方法(物理、化学、生物及模型分组)及其测定方式,并指出这些分组方法中存在的局限性和测定结果中的不确定性,提出按照研究需求选择合适的处理方式的建议。此外,本文还综述了土壤稳定性响应植物及微生物的输入、输出和土壤矿物的机制,指出目前仍缺乏对不同生态系统下影响土壤有机碳稳定性的关键因子和多因素耦合作用对稳定性影响的研究。

Soil organic carbon(SOC)plays a key role in regulating both climate changes and ecosystems,thus it has essential theoretical and practical significance in maintaining or improving SOC stabilization.With the ballooning of research,methods of SOC stability are updating and key factors of SOC stability are still unclear.Therefore,this paper reviews four SOC fractionations(physical,chemical,biological and model)and fraction measurements,and points out that there were limitations in the grouping method and uncertainties in the analysis.It is also suggested that fractionations should be chosen appropriately according to targets of the research.Moreover,this paper also summarizes the mechanism of SOC stability in response to inputs,outputs of vegetation and microbe,and minerals,and finally puts forward for future improvements in key factors and factors coupling of SOC stability under different ecosystems.