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Soil organic carbon dynamics study bias deduced from isotopic fractionation in corn plant
Chenglong Tu;  Congqiang Liu;  Xiaohui Lu;  Lifeng Cui;  Jiayin Du
2017
Source PublicationActa Geochimica
Volume36Issue:3Pages:535-538
Abstract

t Carbon stable isotope techniques were extensively employed to trace the dynamics of soil organic carbon (SOC) across a land-use change involving a shift to vegetation with different photosynthetic pathways. Based on the isotopic mass balance equation, relative contributions of new versus old SOC, and SOC turnover rate in corn fields were evaluated world-wide. However, most previous research had not analyzed corn debris left in the field, instead using an average corn plant d13C value or a measured value to calculate the proportion of corn-derived SOC, either of which could bias results. This paper carried out a detailed analysis of isotopic fractionation in corn plants and deduced the maximum possible bias of SOC dynamics study. The results show approximately 3% isotopic fractionation from top to bottom of the corn leaf. The 13C enrichment sequence in corn plant was tassel[stalk or cob[root [leaves. Individual parts accounting for the total dry mass of corn returned distinct values. Consequently, the average d13C value of corn does not represent the actual isotopic composition of corn debris. Furthermore, we deduced that the greater the fractionation in corn plant, the greater the possible bias. To alleviate bias of SOC dynamics study, we suggest two measures: analyze isotopic compositions and proportions of each part of the corn and determine which parts of the corn plant are left in the field and incorporated into SOC.

KeywordBias Of Soc Dynamics Study Isotopic Fractionation In Corn Isotope Mass Balance Equation Bias Rrange
Indexed ByEI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/7739
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550089, China
2.Guizhou Normal University, Guiyang 550001, China
Recommended Citation
GB/T 7714
Chenglong Tu;Congqiang Liu;Xiaohui Lu;Lifeng Cui;Jiayin Du. Soil organic carbon dynamics study bias deduced from isotopic fractionation in corn plant[J]. Acta Geochimica,2017,36(3):535-538.
APA Chenglong Tu;Congqiang Liu;Xiaohui Lu;Lifeng Cui;Jiayin Du.(2017).Soil organic carbon dynamics study bias deduced from isotopic fractionation in corn plant.Acta Geochimica,36(3),535-538.
MLA Chenglong Tu;Congqiang Liu;Xiaohui Lu;Lifeng Cui;Jiayin Du."Soil organic carbon dynamics study bias deduced from isotopic fractionation in corn plant".Acta Geochimica 36.3(2017):535-538.
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