Sequential combustion separation of soil organic carbon fractions for AMS measurement of 14C and their application in fixation of carbon
- 39 Downloads
A temperature stepped-combustion method for separating soil organic carbon (SOC) fractions and their 14C ages was developed to investigate SOC fixation and stability in soils. After acid-leaching, SOC was sequentially oxidized, and extracted from three temperature intervals: (1) 25–400 °C, (2) 400–600 °C, and (3) 600–900 °C. The acid-soluble carbon and SOC released below 600 °C are labile components, with relatively younger 14C ages, while the SOC released above 600 °C is stable with older 14C ages. We applied this method in a grassland, maize cropland and forest nursery cropland, to assist in understanding the stability of carbon in soils under different land use conditions.
Keywords14C ages Labile-stable SOC Reclaimed cropland Temperature stepped-combustion
This work was jointly supported by National Natural Science Foundation of China (41730108, 41773141, and 41573136); National Research Program for Key Issues in Air Pollution Control (DQGG0105-02); the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA23010302); CAS “Light of West China” Program (XAB2016A01); Youth Innovation Promotion Association CAS (2017452); State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS (SKLLQG1724); Supported by the International Partnership Program of Chinese Academy of Sciences, Grant No. 132B61KYSB20170005. Dr. Cheng Peng would like to express sincere thanks to the Belt &Road Center for Earth Environment Studies and CAS Key Technology Talent Program. We thank anonymous reviewers and the Editor for their insightful comments, which significantly improved this paper. Funding was provided by National Nature Science Foundation of China (Grant No. NSFC41730108), State Key Laboratory of Loess and Quaternary Geology (Grant No. LQ1301).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 4.Fromm SF, Schwab VF, Trumbore SE, Tichomirowa M (2019) Parent material and depth effects on the age of radiocarbon in chemical fractions for Central German soils. Geophysical Research Abstracts 21Google Scholar
- 29.Wang SL, Burr GS, Wang PL, Lin LH, Nguyen VJQG (2016) Tracing the sources of carbon in clay minerals: an example from western Taiwan. Radiocarbon 34:24–32Google Scholar
- 31.Lefevre R, Barre P, Moyano FE, Christensen BT, Bardoux G, Eglin T, Girardin C, Houot S, Katterer T, van Oort F, Chenu C (2014) Higher temperature sensitivity for stable than for labile soil organic carbon—evidence from incubations of long-term bare fallow soils. Global Change Biol 20:633–640CrossRefGoogle Scholar