%0 Journal Article
%T Interacting Controls of Pyrolysis Temperature and Plant Taxa on the Degradability of PyOM in Fire-Prone Northern Temperate Forest Soil
%A Christy D. Gibson
%A Collin P. Ward
%A Jeffrey A. Bird
%A Knute Nadelhoffer
%A Pierre-Joseph Hatton
%A Ruth E. Stark
%A Timothy R. Filley
%J -
%D 2018
%R https://doi.org/10.3390/soilsystems2030048
%X Abstract Tree taxa and pyrolysis temperature are the major controllers of the physicochemical properties of the resultant pyrogenic organic matter (PyOM) produced in fire-prone forests. However, we know little about how these controls determine the residence time of PyOM once introduced to soil. In this study, we tracked the fate of 13C-enriched red maple (RM) or jack pine (JP) wood and PyOM, produced over a range of temperatures (200, 300, 450, or 600 ¡ãC) added to soil from a northern temperate forest in Michigan, USA. Pyrolysis temperature was the main controller of PyOM-C mineralization rates, with mean residence times (MRT) ranging from ~4 to 450 years for both taxa. The PyOM-C mineralization rates for both taxa and the pyrolysis temperature correlated positively with PyOM w (leachable C content); however, the potential PyOM w contribution to net PyOM-C mineralization was lower for JP (14¨C65%) than RM (24¨C84%). The correlation between PyOM w and mineralization rate was strongest where carbonization and the thermochemical conversion of carbohydrates and non-lignin phenols was most pronounced during pyrolysis for each taxa (300 ¡ãC for JP and 450 ¡ãC for RM). Contrary to expectations, the addition of a labile C source, sucrose, to the soil did not enhance the decomposition of PyOM, indicating that soil microbes were not energy limited in the soil-PyOM system studied (regardless of pyrolysis temperature). Our results showed that while the first-order control on PyOM decomposition in this soil is pyrolysis temperature, wood taxa did affect PyOM-C MRT, likely in part due to differences in the amount of reactive water-soluble C present in PyOM. View Full-Tex
%K pyrogenic organic matter
%K decomposition
%K stabilization
%K soil organic matter
%K recalcitrance
%K labile organic matter
%K fire
%K forest soil
%U https://www.mdpi.com/2571-8789/2/3/48