Biomarkers as proxies for plant inputs to peats: an example from a sub-boreal ombrotrophic bog

Lipid distributions in modem peat-forming plants were determined and compared to biomarkers recovered from a ca. 2800 year old peat deposited in a Dutch ombrotrophic bog. The peat section spans a well-constrained shift in local hydrology and vegetation, and potential molecular proxies for plant inputs were directly tested against the macrofossil record. Based on the analyses of modem plants, low-molecular-weight (LMW) n-alkanes (C-23, C-25) and high-molecular-weight n-alkanes (C-33) are proposed as potential biomarkers for Sphagnum and non-Sphagnum inputs, respectively. Consistent with this, in the Bargerveen peat core, LMW n-alkane abundances increase and HMW n-alkane abundances decrease coincident with the shift to Sphagnum dominated peat. Additional potential proxies include the abundances of C-22 alpha,omega-alkanedioic acid and phytenyl phytenoate as Sphagnum indicators and the abundances of the triterpenoids taraxer-14-ene and taraxast-20-ene as biomarkers for Ericaceae rootlets. (C) 2002 Published by Elsevier Science Ltd.