稳定碳同位素技术在土壤有机碳研究中的应用进展

土壤碳周转是大气圈、生物圈与岩石圈之间碳迁移转化的重要过程,其微小变化将影响大气CO2浓度,改变植物地上与地下部分碳的动态与分配。目前稳定碳同位素技术广泛应用于不同时间尺度与空间尺度碳素生物地球化学循环研究,但缺乏针对稳定碳同位素技术应用于土壤有机碳研究的概述。本文在对当前利用稳定碳同位素技术研究土壤碳起源、动态变化以及周转等资料整理的基础上,简要总结陆地生态系统植物叶片-凋落物-土壤连续体、叶片-土壤连续体和土壤中稳定碳同位素(δ13C)变化规律。重点介绍了土壤碳素循环的主要影响因素及其适应规律,同时对比13C自然与13C人工标记法的异同,指出利用稳定碳同位素方法研究土壤碳动态过程中应加强的方面和未来的重点研究方向及趋势。明确上述过程及机制可为预测生态系统的源/汇效应奠定基础,加强对陆地生态系统碳循环定量研究,将对土壤碳源/汇潜力的了解和土壤有机碳周转机理的深入了解有所裨益。

Application of stable carbon isotope technique in soil organic carbon research:A literature review

Soil carbon turnover is an important part of carbon transfer between the atmosphere,biosphere,and lithosphere.Even small changes in the soil carbon pool could affect the atmospheric CO2 concentration and dynamic carbon above and underground.Stable carbon isotope technology is currently used widely in carbon biogeochemical cycle research at different time and space scales.However,there is a lack of integration of this technology with soil carbon turnover research.This literature review examined numerous studies on the application of stable carbon isotope technology to soil carbon origin,turnover,and dynamic changes.It also analyzed stable carbon isotope(δ13C)variations in the leaf-litter-soil leaf-soil continuums,and terrestrial ecosystems;focusing on(1)the characteristics of stable carbon isotope technology in the soil carbon cycle,(2)the main factors influencing the cycle,(3)the adaptive rules of soil carbon cycle turnover,(4)the similarities and differences between natural and artificial 13C labeling methods,and(5)the aspects of future research integration that should be emphasized.This review could elucidate the role of soil carbon sources and sinks in terrestrial ecosystems and soil organic carbon turnover mechanisms and processes.