Getting to the root of the problem: litter decomposition and peat formation in lowland Neotropical peatlands

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Getting to the root of the problem: litter decomposition and peat formation in lowland Neotropical peatlands

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作者：Jorge Hoyos-Santillan ; Barry H. Lomax ; David Large ; Benjamin L. Turner…
关键词：Carbon ; Litter decomposition ; Root ; Tropical peat ; Pyrolysis ; Mass spectrometry
刊名：Biogeochemistry
出版年：2015
出版时间：November 2015
年：2015
卷：126
期：1-2
页码：115-129
全文大小：2,506 KB
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作者单位：Jorge Hoyos-Santillan (1)
Barry H. Lomax (1)
David Large (2)
Benjamin L. Turner (3)
Arnoud Boom (4)
Omar R. Lopez (5)
Sofie Sjögersten (1)

1. Division of Agricultural and Environmental Science, School of Biosciences, The University of Nottingham, Room C-36 Gateway Building, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
2. Department of Chemical and Environmental Engineering, The University of Nottingham, Room A13 Coates Building, University Park Campus, Nottingham, NG7 2RD, UK
3. Smithsonian Tropical Research Institute, Apartado Balboa, 0843–03092, Ancon, Republic of Panama
4. Department of Geography, University of Leicester, Bennett Building - F72b, Leicester, LE1 7RH, UK
5. Centro de Biodiversidad y Descubrimiento de Drogas, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT-AIP), Ciudad del Saber, Clayton, 0843-01103, Republic of Panama
刊物类别：Earth and Environmental Science
刊物主题：Earth sciences
Geochemistry
Biochemistry
Soil Science and Conservation
Terrestrial Pollution
出版者：Springer Netherlands
ISSN：1573-515X

文摘

Litter decomposition is an important control on carbon accumulation in tropical peatlands. We investigated the contribution of different litter tissues from two peatland tree species (Raphia taedigera and Campnosperma panamensis) to peat formation in four lowland tropical peatlands in the Republic of Panama. Leaves, stems, and roots decomposed at different rates; with roots being the slowest to decompose among tissues. The position of litter in the peat profile strongly influenced the decomposition rate of all tissue types. Roots decomposed up to five times faster at the surface than at 50 cm depth. Molecular characterization of litter and peat profiles by tetramethylammonium-pyrolysis–gas chromatography–mass spectrometry (TMAH-Py-GC/MS) revealed that the peat is formed predominantly of decomposed roots and stems, as indicated by the high lignin, low methylated fatty acids and carbohydrate concentrations in these litter types. Taken together, these data demonstrate that roots play a fundamental role in the formation of lowland Neotropical peatlands.