DOI: 10.1029/2018JG004431
Scopus记录号: 2-s2.0-85050629180
论文题名: Tree Mortality From Insect Infestation Enhances Carbon Stabilization in Southern Appalachian Forest Soils
作者: Fraterrigo J.M. ; Ream K. ; Knoepp J.D.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 7 起始页码: 2121
结束页码: 2134
语种: 英语
英文关键词: biogeochemical resilience
; forest disturbance
; mineral-matrix interactions
; soil carbon stabilization
; soil carbon storage
; soil respiration
Scopus关键词: Adelges tsugae
; Adelgidae
; Hexapoda
; Tsuga canadensis
英文摘要: Forest insect and pathogen outbreaks may exacerbate anthropogenic climate change if they accelerate soil carbon loss to the atmosphere. We quantified soil respiration and carbon content for nearly a decade after girdling or natural infestation of hemlock (Tsuga canadensis L. Carr., a codominant species in southern Appalachian forests) by hemlock woolly adelgid (Adelges tsugae) to improve understanding of soil carbon response to disturbance from forest insect and pathogens. From 2005 to 2013, net soil respiration was similar among hemlock mortality (~50% basal area reduction) and reference hardwood plots, but both girdled and hemlock woolly adelgid-infested plots showed greater activities of β-glucosidase (a cellulose-hydrolyzing extracellular enzyme), decreased O-horizon, and decreased fine root biomass. During this period, mineral soil carbon accumulated at a higher rate in hemlock mortality plots than in reference plots in both surface (0–10 cm) and subsurface (10–30 cm) soils, driven by increases in the mineral-associated fraction of the soil organic matter. In contrast, particulate organic matter (POM) carbon accrued slowly in surface soils and declined in the subsurface of girdled plots. δ13C values of the POM fraction demonstrate increased microbial processing of surface soil organic matter over time, suggesting enhanced decomposition of organic matter in this pool. These findings indicate that hemlock mortality in this system has led to enhanced soil carbon stabilization through the transformation and translocation of carbon from detrital and POM pools to the mineral-associated organic matter pool. Accelerated responses in the girdled versus naturally infested treatments highlight limitations associated with using girdling to simulate natural mortality. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113544
Appears in Collections: 气候减缓与适应
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作者单位: Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Program in Ecology, Evolution and Conservation Biology, University of Illinois at Urbana-Champaign, Urbana, IL, United States; USDA Forest Service, Southern Research Station, Coweeta Hydrologic Laboratory, Otto, NC, United States
Recommended Citation:
Fraterrigo J.M.,Ream K.,Knoepp J.D.. Tree Mortality From Insect Infestation Enhances Carbon Stabilization in Southern Appalachian Forest Soils[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(7)