Effects of Microtopography on Absorptive and Transport Fine Root Biomass, Necromass, Production, Mortality and Decomposi
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Effects of Microtopography on Absorptive and Transport Fine Root Biomass, Necromass, Production, Mortality and Decomposition in a Coastal Freshwater Forested Wetland, Southeastern USA Xuefeng Li,1* Kevan J. Minick,1 Jordan Luff,1,6 Asko Noormets,2 Guofang Miao,1,3 Bhaskar Mitra,2 Jean-Christophe Domec,4 Ge Sun,5 Steven McNulty,5 and John S. King1 1 Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, North Carolina 27695, USA; Department of Ecosystem Science and Management, Texas A&M University, College Station, Texas 77843, USA; 3Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA; 4Bordeaux Sciences Agro, University of Bordeaux, INRA TCEM UMR 1220, 33195 Gradignan, France; 5Eastern Forest Environmental Threat Assessment Center, USDA Forest Service, Raleigh, North Carolina, USA; 6Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, Vermont 05405, USA 2
ABSTRACT Forested wetlands are an important carbon (C) sink. Fine roots (diameter < 2 mm) dominate belowground C cycling and can be functionally defined into absorptive roots (order 1–2) and transport roots (order ‡ 3). However, effects of microtopography on the function-based fine root dynamics in forested wetlands are poorly under-
Received 6 May 2019; accepted 23 November 2019 Electronic supplementary material: The online version of this article (https://doi.org/10.1007/s10021-019-00470-x) contains supplementary material, which is available to authorized users. Author’s Contribution X.L. and J. K. conceived the ideas and designed the research, X.L. analyzed the data; X.L., J.L. and K.M. collected the data; X.L., S.N., K.M., A.N., G.M., B.M., J.C., G.S. and J.K. led the writing of the manuscript. *Corresponding author; e-mail: [email protected]
stood. We studied fine root biomass allocation and biomass, necromass, mass loss rate, production, mortality and decomposition of absorptive and transport roots in hummocks and hollows in a coastal plain freshwater forested wetland (FFW) in the southeastern USA using dynamic-flow method. Biomass ratios of first- to second-order roots and absorptive to transport roots and the biomass and necromass of absorptive and transport roots were significantly higher in top 0–10 cm organic peat layer than in 10–20 cm muck and mineral layer, and were significantly higher in hummocks than in hollows. The mass loss rate, production, mortality and decomposition were significantly higher in hummocks than in hollows. Absorptive roots did not have a lower mass loss rate than transport roots. Microtopography significantly affected the contributions of absorptive and transport roots to
X. Li and others the total production, mortality and decomposition. Production, mortality and decomposition of absorptive roots were higher than those of transport roots in hummocks but lower than those of transport roots in hollows. Total (hummocks plus hollows) fine root production, mortality and decomp
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