Journal Title
Title of Journal: Ecosystems
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Publisher
Springer-Verlag
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Authors: Caroline M Preston Jason R Nault J A Trofymow
Publish Date: 2009/09/16
Volume: 12, Issue: 7, Pages: 1078-1102
Abstract
There is still a poor understanding of how changes in the organic composition of litter contribute to slowing or even cessation of decomposition Using 13C nuclear magnetic resonance NMR spectroscopy of samples from the Canadian Intersite Decomposition Experiment CIDET we asked whether increasing lignin per se could account for the wellknown increase in acidunhydrolyzable residue AUR and secondly using three litters from four sites with different mean annual temperatures whether changes in organic composition would follow similar trajectories with C mass loss At 6 years there was 16–39 C remaining for 10 foliar litters and wood blocks at a site with rapid initial decomposition and higher amounts remaining for three species at three colder sites 13C NMR spectra obtained with rapid crosspolarization CP mainly showed increasing similarity among the foliar litters although wood showed little change in composition Foliage generally showed loss of O and diOalkyl C mainly from carbohydrate and increase in alkyl aromatic phenolic and carboxyl C However Oalkyl C loss was limited especially for litters with slow initial decomposition and many litters showed relatively small changes in intensity distribution Quantitative 13C “BD” spectra showed similar trends but even smaller changes in C composition and 6year CP difference spectra showed that C was lost across the whole range of structures Changes in δ13C were small and variable but could be correlated to some extent with loss of carbohydrates versus tannins Lignin was not selectively preserved and the increase of resistant structures derived from lignin tannins and cutin collectively accounts for increasing AUR Compositional changes of NMR C fractions across sites with different temperatures were small and inconsistent likely due to the influence of other site factors however changes in their contents did largely follow consistent trajectories with C remainingTony Trofymow is the leader of the whole CIDET study Caroline Preston was the lead author and did all of the NMR and initial spectral analysis but both Jason Nault and Tony Trofymow contributed heavily to data analysis writing figures and revisionsThe Canadian Intersite Decomposition Experiment CIDET Working Group is a group of researchers cooperating in a 12year study of litter decomposition and who provided the litter samples reported in this paper We also thank Ann Harris PFC for C and N analyses and the Climate Change and Ecosystem Processes Networks of the Canadian Forest Service for support Further information on CIDET is available on the web at wwwpfccfsnrcangcca/climate/cidet
Keywords:
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- Social Perceptions of Rainforest and Climatic Change from Rural Communities in Southern Mexico
- Land cover in single-family housing areas and how it correlates with urban form
- A comparison of the growth and cooling effectiveness of five commonly planted urban tree species
- Tree Harvest in an Experimental Sand Ecosystem: Plant Effects on Nutrient Dynamics and Solute Generation
- Using macroinvertebrate assemblages and multiple stressors to infer urban stream system condition: a case study in the central US
- Numerical Exploration of the Planktonic to Benthic Primary Production Ratios in Lakes of the Baltic Sea Catchment
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- Factors explaining the occurrence of the Siberian flying squirrel in urban forest landscape
- Amending soil with used cooking oil to reduce nitrogen losses after cole crop harvest: a 15 N study
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