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Decadal-scale litter manipulation alters the biochemical and physical character of tropical forest soil carbon
Authors
Almendros
Bach
+86 more
Baisden
Baldock
Baldock
Benjamin L. Turner
Boisier
Chorover
Clark
Coley
Cotrufo
Cusack
Cusack
Cusack
Daniela F. Cusack
De Marco
Dimoyiannis
Edmund V.J. Tanner
Feng
Gelinas
Glaser
Gleixner
Golchin
Golchin
Hall
Hatton
Hockaday
Holdridge
Jobbagy
Kaiser
Kaiser
Kallenbach
Keiluweit
Kleber
Kleber
Kögel-Knabner
Lajtha
LaRowe
Lee H. Dietterich
Leff
Lehmann
Leigh
Leigh
Lewis
Li
Marin-Spiotta
Marin-Spiotta
Min
Moni
Nemani
Preston
Qualls
S. Joseph Wright
Sarah M. Halterman
Sayer
Sayer
Schmidt
Schmidt
SoilSurveyStaff
Sollins
Sollins
Sollins
Strickland
Swanston
Swenson
Swift
Tan
Tanner
Torn
Torn
Torrent
Trumbore
Trumbore
Trumbore
Turner
Vincent
Vogel
von Lutzow
Wagai
Wang
Whitehead
Wieder
William Hockaday
Windsor
Xu
Xu
Yavitt
Yavitt
Publication date
1 January 2018
Publisher
Soil Biology and Biochemistry
Doi
Cite
Abstract
© 2018 Elsevier Ltd Climate change and rising atmospheric carbon dioxide (CO2) concentrations are likely to alter tropical forest net primary productivity (NPP), potentially affecting soil C storage. We examined biochemical and physical changes in soil C fractions in a humid tropical forest where experimental litter manipulation changed total soil C stocks. We hypothesized that: (1.) low-density soil organic C (SOC) fractions are more responsive to altered litter inputs than mineral-associated SOC, because they cycle relatively rapidly. (2.) Any accumulation of mineral-associated SOC with litter addition is relatively stable (i.e. low leaching potential). (3.) Certain biomolecules, such as waxes (alkyl) and proteins (N-alkyl), form more stable mineral-associations than other biomolecules in strongly weathered soils. A decade of litter addition and removal affected bulk soil C content in the upper 5 cm by +32% and −31%, respectively. Most notably, C concentration in the mineral-associated SOC fraction was greater in litter addition plots relative to controls by 18% and 28% in the dry and wet seasons, respectively, accounting for the majority of greater bulk soil C stock. Radiocarbon and leaching analyses demonstrated that the greater mineral-associated SOC in litter addition plots consisted of new and relatively stable C, with only 3% of mineral-associated SOC leachable in salt solution. Solid-state13C NMR spectroscopy indicated that waxes (alkyl C) and microbial biomass compounds (O-alkyl and N-alkyl C) in mineral-associated SOC are relatively stable, whereas plant-derived compounds (aromatic and phenolic C) are lost from mineral associations on decadal timescales. We conclude that changes in tropical forest NPP will alter the quantity, biochemistry, and stability of C stored in strongly weathered tropical soils
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Last time updated on 12/01/2019
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