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Abstract. Despite the importance of soil organic matter (SOM) inthe global carbon cycle, there remain many open questions regarding itsformation and preservation. The study of individual organic compound classesthat make up SOM, such as lipid biomarkers including n-alkanes, can provideinsight into the cycling of bulk SOM. While studies of lipid biomarkers,particularly n-alkanes, have increased in number in the past few decades,only a limited number have focused on the transformation of these compoundsfollowing deposition in soil archives. We performed a systematic review toconsolidate the available information on plant-derived n-alkanes and theirtransformation from plant to soil. Our major findings were (1) a nearlyubiquitous trend of decreased total concentration of n-alkanes either withtime in litterbag experiments or with depth in open plant–soil systems and (2) preferential degradation of odd-chain length and shorter chain length n-alkanes represented by a decrease in either carbon preference index (CPI) or odd-over-even predominance (OEP) with depth, indicating degradation ofthe n-alkane signal or a shift in vegetation composition over time. Thereview also highlighted a lack of data transparency and standardizationacross studies of lipid biomarkers, making analysis and synthesis ofpublished data time-consuming and difficult. We recommend that the communitymove towards more uniform and systematic reporting of biomarker data.Furthermore, as the number of studies examining the completeleaf–litter–soil continuum is very limited as well as unevenly distributed over geographical regions, climate zones, and soil types, future data collection should focus on underrepresented areas as well as quantifying thetransformation of n-alkanes through the complete continuum from plant to soil.

Transformation of &lt;i&gt;n&lt;/i&gt;-alkanes from plant to soil: a review

Transformation of <i>n</i>-alkanes from plant to soil: a review