globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2017.01.014
Scopus ID: 2-s2.0-85010403104
Vertical distribution and persistence of soil organic carbon in fire-adapted longleaf pine forests
Author: Butnor J.R.; Samuelson L.J.; Johnsen K.H.; Anderson P.H.; González Benecke C.A.; Boot C.M.; Cotrufo M.F.; Heckman K.A.; Jackson J.A.; Stokes T.A.; Zarnoch S.J.
Source Publication: Forest Ecology and Management
ISSN:  0378-1127
Publishing Year: 2017
Volume: 390
pages begin: 15
pages end: 26
Language: 英语
Keyword: C stocks ; Pinus palustris ; Prescribed fire ; Pyrogenic C ; Radiocarbon ; Soil carbon
Scopus Keyword: Atmospheric chemistry ; Biodiversity ; Biomass ; Carbon dioxide ; Climate change ; Forestry ; Organic carbon ; Oxidation resistance ; Residence time distribution ; Soils ; Stabilization ; Biomass accumulation ; Longleaf pine ecosystems ; Pinus palustris ; Prescribed fires ; Radiocarbon ; Soil carbon ; Soil organic carbon ; Vertical distributions ; Soil pollution ; biodiversity ; biomass ; carbon dioxide ; carbon sequestration ; carbon sink ; chronosequence ; climate change ; coniferous forest ; coniferous tree ; fire ; forest product ; organic carbon ; persistence ; prescribed burning ; soil carbon ; vertical distribution ; vertical profile ; United States ; Pinus echinata ; Pinus palustris
English Abstract: Longleaf pine (Pinus palustris Miller) forests in the southern United States are being restored and actively managed for a variety of goals including: forest products, biodiversity, C sequestration and forest resilience in the face of repeated disturbances from hurricanes and climate change. Managed southern pine forests can be sinks for atmospheric CO2 in forest biomass; however, the persistence of biomass in the environment or in forest products is limited, thus making soil C the primary long-term pool. Little is known about the size of extant soil C pools, residence time of soil C or the role that frequent burning plays in C stabilization in longleaf pine ecosystems. We sampled soil from a chronosequence of longleaf pine stands ranging in age from 5 to 87 years to quantify the vertical distribution of soil organic carbon (SOC) stocks; both oxidizable (SOCOX) and oxidation resistant (SOCR) fractions, pyrogenic carbon (PyC) and the mean residence time (MRT) of SOC and its associated fractions. SOC stocks (0–1 m) ranged from 44.1 to 98.1 (x¯ = 77.0) Mg C ha−1, and no effect of stand age or biomass accumulation on SOC stocks was detected. Soil C accumulation was associated with elevated clay and extractable Fe contents. While SOC concentration declined with soil depth, the proportion of SOCR in SOC increased with depth. PyC was a minor component of soil C, representing 5–7% of SOC and the proportion was not depth dependent. The MRT of SOC was hundreds of years near the surface and many thousands of years at depth. Though SOCR was less abundant than SOCOX, SOCR MRT was an order of magnitude greater than SOCOX MRT and had a strong influence on bulk SOC MRT. The majority of the PyC was in the less persistent SOCox and not associated with long-term C storage in soil. Despite the flow of C from biomass in the form of decay products, litter fall, root turnover and pulses of PyC, these soils preserve little of recent inputs, which may be rapidly oxidized, lost to the atmosphere from periodic fires or, in the case of PyC, may be transported out of the system via erosion. Our results indicate that these soils were not strong sinks for atmospheric CO2, especially when compared to C accumulation in biomass. © 2017
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被引频次[WOS]:7   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:影响、适应和脆弱性

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Affiliation: USDA Forest Service, Southern Research Station, University of Vermont, 81 Carrigan Drive, Aiken Center, Burlington, VT, United States; School of Forestry and Wildlife Sciences, Auburn University, 3301 SFWS Building, Auburn, AL, United States; USDA Forest Service, Southern Research Station, 1577 Brevard Road, Asheville, NC, United States; USDA Forest Service, Southern Research Station, 3041 East Cornwallis Road, Research Triangle Park, NC, United States; Department of Forest Engineering, Resources and Management, College of Forestry, Oregon State University, 280 Peavy Hall, Corvallis, OR, United States; Natural Resource Ecology Laboratory, Dept. 1499, Colorado State University, Fort Collins, CO, United States; Central Instrument Facility, Department of Chemistry, Colorado State University, 1872 Campus Delivery, 200 W. Lake, Fort Collins, CO, United States; USDA Forest Service, Northern Research Station, Forestry Sciences Laboratory, 410 MacInnes Drive, Houghton, MI, United States; Vance-Granville Community College, 200 Community College Road, Henderson, NC, United States; USDA Forest Service, Southern Research Station, Clemson, SC, United States

Recommended Citation:
Butnor J.R.,Samuelson L.J.,Johnsen K.H.,et al. Vertical distribution and persistence of soil organic carbon in fire-adapted longleaf pine forests[J]. Forest Ecology and Management,2017-01-01,390
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