Differential effects of sugar maple, red oak, and hemlock tannins on carbon and nitrogen cycling in temperate forest soils.

Oecologia
Jennifer M Talbot, Adrien C Finzi

Abstract

Tannins are abundant secondary chemicals in leaf litter that are hypothesized to slow the rate of soil-N cycling by binding protein into recalcitrant polyphenol-protein complexes (PPCs). We studied the effects of tannins purified from sugar maple, red oak, and eastern hemlock leaf litter on microbial activity and N cycling in soils from northern hardwood-conifer forests of the northeastern US. To create ecologically relevant conditions, we applied tannins to soil at a concentration (up to 2 mg g(-1) soil) typical of mineral soil horizons. Sugar maple tannins increased microbial respiration significantly more than red oak or hemlock tannins. The addition of sugar maple tannins also decreased gross N mineralization by 130% and, depending upon the rate of application, decreased net rates of N mineralization by 50-290%. At low concentrations, the decrease in mineralization appeared to be driven by greater microbial-N immobilization, while at higher concentrations the decrease in mineralization was consistent with the formation of recalcitrant PPCs. Low concentrations of red oak and hemlock tannins stimulated microbial respiration only slightly, and did not significantly affect fluxes of inorganic N in the soil. When applied to soil...Continue Reading

References

Apr 8, 1999·Biodegradation·T K BhatO P Sharma
May 10, 2000·Trends in Ecology & Evolution·S Hättenschwiler, P M Vitousek
Oct 1, 1992·Trends in Ecology & Evolution·S E Hobbie
Mar 1, 1987·Journal of Chemical Ecology·A E Hagerman
Oct 1, 1990·Oecologia·David A Wedin, David Tilman

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Citations

Feb 25, 2009·Oecologia·Anne Gallet-BudynekAdrien C Finzi
Apr 3, 2013·Plant Physiology and Biochemistry : PPB·Michael A SchmidtAnn E Hagerman
Sep 6, 2019·Nature Communications·Bartosz AdamczykJussi Heinonsalo
May 1, 2021·Nature Communications·Bridget B McGivernKelly C Wrighton

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