Geologic controls of soil carbon cycling and microbial dynamics in temperate conifer forests

Heckman, Katherine; Welty-Bernard, Amy; Rasmussen, Craig; Schwartz, Egbert

doi:10.1016/j.chemgeo.2009.01.004

Cited by 82 publications

(55 citation statements)

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“…Variation in bacterial communities, as measured by terminal restriction fragment length polymorphism, was clearly divided by soil parent material type, with variation primarily explained by pH, trivalent Al, and amorphous Fe-oxyhydroxide content [9].…”

Section: Feedbacks Between Soil Physicochemical Properties and Microbmentioning

confidence: 99%

“…Mean annual precipitation and temperature ranged from 685 to 815 mm and 9-12 • C, respectively. Sample site coordinates and detailed site descriptions are given in Heckman et al [9]. Only the mineral-associated fraction of organics (here termed the heavy fraction) was examined in this manuscript since this investigation is focused on the mechanisms determining the composition and stability of mineral-bound organics specifically.…”

Section: Methodsmentioning

confidence: 99%

“…Chemical class assignments were made on the basis of comparison to published works. Soils additionally underwent incubation for estimates of biomass abundances and C use efficiencies [9]. Radiocarbon abundance of bulk soils and density separates were measured by accelerator mass spectrometry at the NSF-Arizona AMS Laboratory at the University of Arizona (Tucson, AZ, USA) [40], the Centro Nacional de Aceleradores (Seville, Spain) [41], and the Center for AMS at Lawrence Livermore National Laboratory (Livermore, CA, USA) [42,43].…”

Section: Methodsmentioning

confidence: 99%

“…Benchtop experiments have suggested that mineral surface chemistry may influence the soil C cycle through processes such as competitive sorption [1][2][3][4], selective preservation [5,6], and feedbacks with microbial communities [7][8][9][10]. Here we investigate these interactions in naturally formed forest soils from a lithosequence under ponderosa pine.…”

Section: Introductionmentioning

confidence: 99%

“…Variation in bulk C abundance and bacterial community composition were associated with variation in Al and Fe phases of differing crystallinity. Data suggested a gradient in the dominant mechanism of SOM stabilization across sites, with chemical recalcitrance and metal-humus complexation the dominant control in soils of the acidic rhyolite and granite sites, and mineral adsorption the dominant factor in the basic dolostone and basalt sites [9]. Accompanying microbial community characterization and manipulative laboratory studies highlighted the role of Al toxicity in shaping microbial community composition across the acidity gradient offered by this lithosequence [30].…”

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confidence: 99%

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Variation in the Molecular Structure and Radiocarbon Abundance of Mineral-Associated Organic Matter across a Lithosequence of Forest Soils

et al. 2018

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Soil mineral assemblage influences the abundance and mean residence time of soil organic matter both directly, through sorption reactions, and indirectly, through influences on microbial communities. Though organo-mineral interactions are at the heart of soil organic matter cycling, current models mostly lack parameters describing specific mineral assemblages or phases, and treat the mineral-bound pool as a single homogenous entity with a uniform response to changes in climatic conditions. We used pyrolysis GC/MS in combination with stable isotopes and radiocarbon abundance to examine mineral-bound soil organic matter fractions from a lithosequence of forest soils. Results suggest that different mineral assemblages tend to be associated with soil organics of specific molecular composition, and that these unique suites of organo-mineral complexes differ in mean residence time. We propose that mineralogy influences the composition of the mineral-bound soil organic matter pool through the direct influence of mineral surface chemistry on organo-mineral bond type and strength in combination with the indirect influence of soil acidity on microbial community composition. The composition of the mineral-bound pool of soil organic matter is therefore partially dictated by a combination of compound availability and sorption affinity, with compound availability controlled in part by microbial community composition. Furthermore, results are suggestive of a preferential sorption of N-containing moieties in Fe-rich soils. These bonds appear to be highly stable and confer extended mean residence times.

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Section: Feedbacks Between Soil Physicochemical Properties and Microbmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Variation in the Molecular Structure and Radiocarbon Abundance of Mineral-Associated Organic Matter across a Lithosequence of Forest Soils

et al. 2018

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Ecosystem‐scale carbon allocation among different land uses: implications for carbon stocks in the Yellow River Delta

Jiao

et al. 2020

Ecosphere

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The reclamation area of the Chinese Yellow River Delta (YRD) has experienced frequent land use changes in recent decades. The consequence of such land use changes on the stocks and allocation of ecosystem-scale carbon is not known. Here, we assessed carbon stocks and allocation of four representative land uses in the YRD area: (1) purple alfalfa (LAL), (2) reed and Aeluropus littoralis (RAE), (3) cotton (ECO), and (4) Chinese tamarisk (CTA). The results showed that the overall carbon stocks, and carbon stocks of aboveground, litter, roots, and soil were notably different among different land uses. The native CTA land had the largest overall carbon stock (belowground and aboveground) and had the strongest potential to allocate the carbon to the soil carbon pool (95.72%), followed by the natural grassland (RAE). Alfalfa grassland (LAL) also had a large carbon stock due to its large aboveground biomass, litter, and roots, but the relative allocation proportion of soil carbon stock was lower than that of the other land uses examined. Cotton (ECO) had the lowest soil carbon and total carbon stocks among four land uses. In combining our data on the carbon pool with changes of land use in the YRD area, we argued that land reclamation in the YRD area was likely to turn this area from a carbon sink to carbon source with the release of soil organic carbon. Therefore, cautions should be taken to reduce carbon release, if the reclaimed land be used to plant crops.

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Spodosol development and soil organic carbon distribution along a lithosequence in perhumid coastal temperate rainforest

Fedenko,

D'Amore,

Spinola

et al. 2024

Soil Science Soc of Amer J

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A dense concentration of old‐growth forest and a wet, cold climate promote mineral weathering and leaching in coastal temperate rainforest soils. Our objective was to assess soil development and soil organic carbon (SOC) distribution across 18 soil profiles in remote, upland terrain of southeast Alaska where pedon data are sparse. We made soil morphological observations, collected samples, and completed laboratory analyses to measure SOC content, pH, and particle size distribution. The survey of upland backslope soils included north‐ and south‐facing hillslopes derived from three lithologies (slate, metavolcanic, and phyllite). The soils across all sites were very gravelly (51.8 ± 20.4% coarse fragments), acidic (mineral soil pH 4.85 ± 0.45), and moderately deep (96.56 ± 37.80 cm); thin, broken E horizons were underlain by thick, carbon‐rich spodic horizons. Soil development was relatively consistent as demonstrated by the Profile Development Index with values from 15 to 26 and Podzolization Index values spanning 8 to 14. A mean pedon SOC stock of 198.02 ± 81.42 Mg C ha−1 (n = 18) was calculated using data collected for all upland organic and mineral soils from our work. The accumulation of SOC was similar among soils formed from contrasting lithologies with averages of 182 ± 15.70 Mg C ha−1 for slate, 188 ± 53.80 Mg C ha−1 for metavolcanic, and 218 ± 124 Mg C ha−1 for phyllite. Our work contributes to soil morphological observations, laboratory data, and SOC stock estimates required to better constrain and model pedogenic processes and SOC stock in remote forests where data sets are limited.

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Geologic controls of soil carbon cycling and microbial dynamics in temperate conifer forests

Cited by 82 publications

References 58 publications

Variation in the Molecular Structure and Radiocarbon Abundance of Mineral-Associated Organic Matter across a Lithosequence of Forest Soils

Variation in the Molecular Structure and Radiocarbon Abundance of Mineral-Associated Organic Matter across a Lithosequence of Forest Soils

Ecosystem‐scale carbon allocation among different land uses: implications for carbon stocks in the Yellow River Delta

Spodosol development and soil organic carbon distribution along a lithosequence in perhumid coastal temperate rainforest

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