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Article summary:
1. Stem girdling was used to terminate autotrophic soil respiration and root exudation in a temperate Norway spruce stand, and rates of soil respiration and dissolved organic carbon (DOC) formation were measured.
2. Pyrolysis products were grouped according to their precursor origins: polysaccharides, proteins or of mixed origin (mainly derivates of lignins and proteins).
3. The enhanced decomposition in girdled plots was further supported by the isotopic composition of DOC in soil solution; all three precursor groups became isotopically enriched as the growing season progressed.
Article analysis:
The article is generally reliable and trustworthy, as it provides evidence for its claims through experiments conducted in a temperate Norway spruce stand. The authors provide detailed information about the techniques used to measure rates of soil respiration and DOC formation, as well as the molecular and isotopic composition of DOC in the soil solution. Furthermore, they provide evidence for their claims through analysis of pyrolysis products grouped according to their precursor origins, as well as the isotopic composition of DOC in soil solution.
However, there are some potential biases that should be noted. For example, the authors do not explore any counterarguments or present both sides equally when discussing their findings. Additionally, they do not mention any possible risks associated with stem girdling or other techniques used in this study. Finally, there is some promotional content throughout the article which could be seen as biased towards certain conclusions or interpretations made by the authors.