Land Cover Differences in Soil Carbon and Nitrogen at Fort Benning, Georgia

Garten, Charles T.

doi:10.2172/885825

Cited by 10 publications

(19 citation statements)

References 11 publications

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“…2). In addition, the simulated total SOC in the top 20-cm layer for Fort Benning in 2000 was 2414 g C m −2 , which compared well with the field measurement of 2424 g C m −2 (Garten and Ashwood, 2004). The simulated total forest biomass carbon for counties Russell, Chattahoochee, and Marion in 2007 was 5126, 5839, and 4236 g C m −2 , which were in good agreement with the forest inventories of 5063, 5479, and 3968 g C m −2 (excluding foliage), respectively (USDA Forest Service, 2007 RPA data, available at: http://www.fia.fs.fed.us/tools-data/).…”

Section: Model Simulationssupporting

confidence: 71%

Ignoring detailed fast-changing dynamics of land use overestimates regional terrestrial carbon sequestration

Zhao

Liu

et al. 2009

Biogeosciences

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Abstract. Land use change is critical in determining the distribution, magnitude and mechanisms of terrestrial carbon budgets at the local to global scales. To date, almost all regional to global carbon cycle studies are driven by a static land use map or land use change statistics with decadal time intervals. The biases in quantifying carbon exchange between the terrestrial ecosystems and the atmosphere caused by using such land use change information have not been investigated. Here, we used the General Ensemble biogeochemical Modeling System (GEMS), along with consistent and spatially explicit land use change scenarios with different intervals (1 yr, 5 yrs, 10 yrs and static, respectively), to evaluate the impacts of land use change data frequency on estimating regional carbon sequestration in the southeastern United States. Our results indicate that ignoring the detailed fast-changing dynamics of land use can lead to a significant overestimation of carbon uptake by the terrestrial ecosystem. Regional carbon sequestration increased from 0.27 to 0.69, 0.80 and 0.97 Mg C ha −1 yr −1 when land use change data frequency shifting from 1 year to 5 years, 10 years interval and static land use information, respectively. Carbon removal by forest harvesting and prolonged cumulative impacts of historical land use change on carbon cycle accounted for the differences in carbon sequestration between static and dynamic land use change scenarios. The results suggest that it is critical to incorporate the detailed dynamics of land use change into local to global carbon cycle studies. Otherwise, it is impossible to accurately quantify the geographic distributions, magnitudes, and mechanisms of terrestrial carbon sequestration at the local to global scales.

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Section: Model Simulationssupporting

confidence: 71%

Ignoring detailed fast-changing dynamics of land use overestimates regional terrestrial carbon sequestration

Zhao

Liu

et al. 2009

Biogeosciences

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“…Sampling sites were widely distributed over the 73,000 ha installation. Details on the sampling methods are published elsewhere (Garten and Ashwood, 2004) but are briefly summarized here for the reader's convenience.…”

Section: Field Measurementsmentioning

confidence: 99%

“…Over a period of three years, soil C and N concentrations (g element g -1 soil) and stocks (g element m -2 ) were measured at barren sites, old fields, and forests on Fort Benning to a 30 cm soil depth (Garten and Ashwood, 2004). Replicate soil samples were collected at each site using a stainless steel soil recovery probe (2.54 cm inner diameter) with hammer attachment (AMS, American Falls, ID).…”

Section: Soil Carbon and Nitrogen Stocksmentioning

confidence: 99%

“…The fresh mineral soil was passed through a 6.3 mm sieve to exclude rocks and coarse debris. Using methods described elsewhere (Garten et al, 2003;Garten and Ashwood, 2004), part of the sieved soil was used for the determination of C stocks in particulate organic matter (POM). A separate portion of sieved soil was extracted by shaking for two hours with 2 molar potassium chloride (1 part soil:10 parts solution) to determine initial extractable soil NH 4 -N and NO 3 -N. The sieved soils were incubated in closed plastic jars, in the dark, at room temperature (21 °C).…”

Section: Soil Nitrogen Availabilitymentioning

confidence: 99%

“…At Fort Benning, Georgia, field training with tracked vehicles has resulted in an overall loss of soil quality at some training sites (Garten et al, 2003). Barren, heavily disturbed soils at Fort Benning have negligible O-horizons, lower soil N availability, and lower soil C and N stocks than soils subject to minimal military use (Garten and Ashwood, 2004). In some environments, it has been shown that the effects of soil disturbance by military vehicles can persist for decades (e.g., Iverson et al, 1981).…”

Section: Introductionmentioning

confidence: 99%

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Modeling Soil Quality Thresholds to Ecosystem Recovery at Fort Benning, Georgia, USA

Garten¹

2004

Self Cite

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Intra-annual variation of soil respiration across four heterogeneous longleaf pine forests in the southeastern United States

ArchMiller

Samuelson

2016

Forest Ecology and Management

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Soil respiration (R S) is one of the largest fluxes of net ecosystem exchange and is related to both soil climate and vegetatively driven substrate supply at various spatial and temporal scales. Relationships between the intra-annual variation in R S and abiotic and biotic variables were examined across diverse longleaf pine (Pinus palustris Mill.) forests to better understand factors related to R S in these low density, spatially heterogeneous forests. Soil respiration, soil temperature, soil moisture, litter mass, size and proximity of nearby trees, understory cover, and root biomass were measured over 13 months in four longleaf pine forests varying in age from 5 to 87 years. The exponential relationship between R S and soil temperature accounted for the majority of the intra-annual variation in R S with a corresponding temperature sensitivity (Q 10) of 2.18. Soil moisture affected the R S-temperature relationship by dampening R S and Q 10 during times of extremely dry soil conditions, as defined by soil moisture ≤ 50 % of the texture-derived wilting point, but volumetric soil moisture did not directly correlate with R S. The intra-annual variation in temperature-normalized R S was negatively related to the distance to nearest tree and positively related to pine root biomass, but not related to litter mass, understory cover, or stand structural variables such as stand age, basal area, or tree density. Annual R S estimates ranged from 12.0 Mg ha −1 of C in the 5-year-old stand with mostly grass stage seedlings to 13.9 Mg ha −1 of C in the dense 21-year-old stand. This study contributes to our understanding of carbon fluxes across diverse longleaf pine ecosystems and indicates the importance of climate in determining the carbon sink potential of southeastern longleaf pine forests.

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Land Cover Differences in Soil Carbon and Nitrogen at Fort Benning, Georgia

Cited by 10 publications

References 11 publications

Ignoring detailed fast-changing dynamics of land use overestimates regional terrestrial carbon sequestration

Ignoring detailed fast-changing dynamics of land use overestimates regional terrestrial carbon sequestration

Modeling Soil Quality Thresholds to Ecosystem Recovery at Fort Benning, Georgia, USA

Intra-annual variation of soil respiration across four heterogeneous longleaf pine forests in the southeastern United States

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