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Table 1.

Summary of the indices and their calculations used in this study to describe the changes in the alkane composition of the sediments of Fuxian Lake. DOI: https://doi.org/10.1525/elementa.2021.00068.t1

IndexCalculationReference
ACL [(25(C25) + 27(C27) + 29(C29) + 31(C31) + 33(C33)]/(C25 + C27 + C29 + C31 + C33Poynter and Eglinton (1990)  
CPI 1/2[(C25 + C27 + C29 + C31 + C33)/(C24 + C26 + C28 + C30 + C32) + (C25 + C27 + C29 + C31 + C33)/(C26 + C28 + C30 + C32 + C34)] Bray and Evans (1961); Shen et al. (2019)  
TAR (C27 + C29 + C31)/(C15 + C17 + C19Meyers (2003)  
Paq (C23 + C25)/(C23 + C25 + C29 + C31Ficken et al. (2000)  
IndexCalculationReference
ACL [(25(C25) + 27(C27) + 29(C29) + 31(C31) + 33(C33)]/(C25 + C27 + C29 + C31 + C33Poynter and Eglinton (1990)  
CPI 1/2[(C25 + C27 + C29 + C31 + C33)/(C24 + C26 + C28 + C30 + C32) + (C25 + C27 + C29 + C31 + C33)/(C26 + C28 + C30 + C32 + C34)] Bray and Evans (1961); Shen et al. (2019)  
TAR (C27 + C29 + C31)/(C15 + C17 + C19Meyers (2003)  
Paq (C23 + C25)/(C23 + C25 + C29 + C31Ficken et al. (2000)  

ACL = average chain length; CPI = carbon preference index; TAR = terrigenous/aquatic ratios; Paq = proportion of aquatic macrophytes.

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