Rock-Eval热分解法及其在土壤有机碳研究中的应用

Rock-Eval thermal analysis method for soil organic carbon measurement-A review

  • 摘要: 土壤有机碳的稳定性影响土壤固碳潜力,如何提取土壤活性及稳定性碳组分用以定量表征土壤有机碳稳定性,是土壤固碳研究领域的关键科学问题。当前,提取土壤有机碳活性及稳定性组分的方法多样,包括物理、化学及生物手段,导致结果难以比较,同时存在耗时长、成本高及操作步骤繁琐等缺点。所以,亟需一种高效、可信度高且应用广泛的测定方法。对比分析不同热分解技术的优缺点,包括热裂解气相-质谱联用测定技术、热重分析技术、差示扫描量热分析技术及Rock-Eval(RE)热分解方法,普遍认为RE方法操作简单、耗时短、成本低、结果易于分析,可信度较高,可以很好地表征土壤有机碳稳定性,有利于土壤有机碳研究的横向对比。本文通过Citespace软件综述了RE方法在土壤学和有机碳研究中发展过程,梳理了其应用现状及进展。提出RE方法有助于通过建立不同土地利用方式、气候带以及不同土壤质地间活性及稳定性碳库的比较网络体系,完善我国土壤碳库监测系统。

     

    Abstract: Soil organic carbon(SOC)sequestration potential is relevant to its stability.How to extract the labile and stable carbon fractions is essential to quantitatively characterize the SOC stability.At present, various methods, including physical, chemical and biological methods are being used to extract the labile and stable carbon fractions, however, it is difficult to compare the results generated from different methodologies.Meanwhile, those methods have disadvantages such as time-consuming, high cost, and complex operation process.Hence, it is urgent to seek an efficient and reliable method, which also can be widely applied in research areas.The present review compares different thermal analysis methods including Pyrolysis Gas Chromatography Mass Spectroscopy(PC/MS), Thermogravimetry(TG), Differential Scanning Calorimetry(DSC)and Rock-Eval(RE).RE method is the least time consuming with lowest cost, and can reflect SOC stability representatively and efficiently, which has been applied on the comparison across studies.Citespace is employed to assess the development of RE method and its application status.The RE method is useful to construct the SOC monitoring system in China by establishing a comparative network system to investigate labile and stable carbon pools under different land use patterns, climatic zones, and different soil textures.

     

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