期刊论文详细信息
Soil Systems
Interacting Controls of Pyrolysis Temperature and Plant Taxa on the Degradability of PyOM in Fire-Prone Northern Temperate Forest Soil
Ward, Collin P.1  Gibson, Christy D.3  Bird, Jeffrey A.4  Filley, Timothy R.5  Hatton, Pierre-Joseph6  Nadelhoffer, Knute7  Stark, Ruth E.8 
[1]Environmental Sciences, Queens College, City University of New York, Flushing, NY 11367, USA
[2]Department of Chemistry and Biochemistry, The City College of New York and CUNY Institute for Macromolecular Assemblies, New York, NY 10031, USA
[3]Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN 47906, USA
[4]Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA
[5]Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02360, USA
[6]Purdue Climate Change Research Center, Purdue University, West Lafayette, IN 47906, USA
[7]School of Earth &
[8]The Graduate Center, City University of New York, New York, NY 11367, USA
关键词: pyrogenic organic matter;    decomposition;    stabilization;    soil organic matter;    recalcitrance;    labile organic matter;    fire;    forest soil;   
DOI  :  10.3390/soilsystems2030048
学科分类:土壤学
来源: mdpi
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【 摘 要 】
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 °C) 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 PyOMw (leachable C content); however, the potential PyOMw contribution to net PyOM-C mineralization was lower for JP (14–65%) than RM (24–84%). The correlation between PyOMw 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 °C for JP and 450 °C 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.
【 授权许可】

CC BY   

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