air temperature
; angiosperm
; coniferous tree
; ecotone
; experimental study
; forest fire
; gymnosperm
; physicochemical property
; pyrolysis
; soil organic matter
; species diversity
; thermodynamics
; Acer
; Acer rubrum
; Gymnospermae
; Magnoliophyta
英文摘要:
We know little about how shifts in tree species distribution and increases in forest fire intensity could affect the formation of pyrogenic organic matter (PyOM) or charcoal, one of the most important and persistent soil organic matter pools. This limitation arises partly because the role of the precursor wood in controlling PyOM formation is unclear. The current study shows how tree species and pyrolysis temperature (200, 300, 450 and 600��C) interact to control the physicochemical structure of the PyOM experimentally derived from 13C/15N-enriched Pinus banksania and Acer rubrum, two important co-occurring gymnosperm and angiosperm tree species from North American boreal-temperate ecotones. Complementary physicochemical and thermodynamic measurements revealed different susceptibilities of the two wood species to charring, with PyOM intermediates formed at lower temperature from the pine, indicating that the tree species regulated the efficacy of PyOM formation. Particularly, we report high-resolution data describing the comprehensive chemical architecture of PyOM (both –C and –N) as they are formed, which are complemented by unique molecular-level insights on their labile fractions. We posit that the tree species and pyrolysis temperature interaction reflects distinctive anatomical features of the two major tree taxa, including greater effective porosity in gymnosperms that promote the loss of volatiles and enhance the heat exposure of bio-components. This study points to a higher temperature threshold for PyOM production in maple forests compared with pine forests, resulting in potentially more degradable and less sorbtive PyOM in ecotones dominated by the former species. � 2016, Springer International Publishing Switzerland.
School of Earth and Environmental Sciences, Queens College, City University of New York, New York, NY, United States; Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, United States; Department of Chemistry and Biochemistry, City College and CUNY Institute for Macromolecular Assemblies, City University of New York, New York, NY, United States; Department of Earth, Atmospheric and Planetary Sciences and the Purdue Climate Change Research Center, Purdue University, West Lafayette, IN, United States; Department of Earth and Environmental Sciences, University of Pennsylvania, Philadelphia, PA, United States; Department of Geography, University of Zurich, Zurich, Switzerland; Departments of Earth Science, BioSciences, and Chemistry, Rice University, Houston, TX, United States; Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ, United States; Biochemistry, Biology, Chemistry, and Physics PhD Programs, The Graduate Center of The City University of New York, New York, NY, United States; Earth and Environmental Sciences and Biology PhD Programs, The Graduate Center of The City University of New York, New York, NY, United States
Recommended Citation:
Hatton P.-J.,Chatterjee S.,Filley T.R.,et al. Tree taxa and pyrolysis temperature interact to control the efficacy of pyrogenic organic matter formation[J]. Biogeochemistry,2016-01-01,130(2018-01-02)