Interacting Controls of Pyrolysis Temperature and Plant Taxa on the Degradability of PyOM in Fire-Prone Northern Temperate Forest Soil

摘要: Tree taxa and pyrolysis temperature are the major controllers of physicochemical properties resultant pyrogenic organic matter (PyOM) produced in fire-prone forests. However, we know little about how these controls determine residence time PyOM once introduced to soil. In this study, tracked fate 13C-enriched red maple (RM) or jack pine (JP) wood PyOM, over a range temperatures (200, 300, 450, 600 °C) added soil from northern temperate forest Michigan, USA. Pyrolysis was main controller PyOM-C mineralization rates, with mean times (MRT) ranging ~4 450 years for both taxa. The rates correlated positively PyOMw (leachable C content); however, potential contribution net lower JP (14–65%) than RM (24–84%). correlation between rate strongest where carbonization thermochemical conversion carbohydrates non-lignin phenols most pronounced during each (300 °C RM). Contrary expectations, addition labile source, sucrose, did not enhance decomposition indicating that microbes were energy limited soil-PyOM system studied (regardless temperature). Our results showed while first-order control on is temperature, affect MRT, likely part due differences amount reactive water-soluble present PyOM.