Effect of the Relative Abundance of Conifers Versus Hardwoods on Soil δ13C Enrichment with Soil Depth in Eastern Canadian forests

Marty, Charles; Houle, Daniel; Gagnon, Christian

doi:10.1007/s10021-015-9852-2

Cited by 13 publications

(4 citation statements)

References 66 publications

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“…Vertical patterns of d 13 C values with proceeding pedogenesis Thirdly, we hypothesized a continuous decrease in decomposition with time. However, beta C values as approximation of decomposition (Acton et al 2013;Brunn et al 2014;Diochon and Kellman 2008;Garten 2006;Guillaume et al 2015;Marty et al 2015) increased during early ecosystem development and at old sites, while they were lowest at the intermediate stages (1500 years) which falsifies our third hypothesis. Vertical d 13 C patterns described by beta C values (1.2 ± 0.1) and D 13 C (1.9 ± 0.1 %) were at the lower end of data reported in the literature (Brunn et al 2014;Garten 2006;Guillaume et al 2015;Powers and Schlesinger 2002).…”

Section: Discussionmentioning

confidence: 58%

Vertical distribution of carbon and nitrogen stable isotope ratios in topsoils across a temperate rainforest dune chronosequence in New Zealand

et al. 2016

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Chronosequences can provide valuable insights into carbon (C) and nitrogen (N) dynamics across natural gradients with C and N stable isotopes serving as powerful tool investigating these dynamics. We studied changes in d 13 C and d 15 N values in litter, organic layer and mineral soil on dunes across the Haast chronosequence (New Zealand), which spans 120 to 2870 years of pedogenesis beneath a temperate rainforest. Decomposition was approximated from linear regression slopes between C concentrations and d 13 C values and termed beta C . Similarly we calculated beta N values to test the relationship between vertical N decrease and d 15 N increase. Decreasing d 13 C values of litter with age suggests a physiological response of plants to decreased litter N concentrations. A decrease of litter d 15 N in the early succession stages and a second decline after 1300 years indicates reduced N 2 fixation. Beta C values increased during early ecosystem development and at old sites, and were lowest at the intermediate stages (1500 years), which suggests decomposition did not decrease constantly with time.Beta N values were lowest at the youngest site and increased within the first 200 years, likely because litter as the uppermost part of the vertical depth profile reflected an increased supply of N depleted in 15 N provided by fungi. We found relations between beta C and beta N values suggesting that there might be shared processes shaping d 13 C and d 15 N vertical depth profiles, e.g. microbial cycling, transport or sorption.

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Section: Discussionmentioning

confidence: 58%

Vertical distribution of carbon and nitrogen stable isotope ratios in topsoils across a temperate rainforest dune chronosequence in New Zealand

et al. 2016

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“…Throughout the soil profile, d 13 C of SOM was affected by tree identity with consistently highest values in Douglas fir stands and lowest values in oak stands. In contrast, Marty et al (2015) found a negative impact of the percentage of conifers in Canadian forests on d 13 C values in mineral horizons. They assume that this was caused by lower microbial activity and/or lower SOM degradation at sites dominated by conifers.…”

Section: Depth Profiles Of D 13 C and D 15 N And Their Relationship Tmentioning

confidence: 61%

The linkage of 13C and 15N soil depth gradients with C:N and O:C stoichiometry reveals tree species effects on organic matter turnover in soil

et al. 2020

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The knowledge of tree species dependent turnover of soil organic matter (SOM) is limited, yet required to understand the carbon sequestration function of forest soil. We combined investigations of 13C and 15N and its relationship to elemental stoichiometry along soil depth gradients in 35-year old monocultural stands of Douglas fir (Pseudotsuga menziesii), black pine (Pinus nigra), European beech (Fagus sylvatica) and red oak (Quercus rubra) growing on a uniform post-mining soil. We investigated the natural abundance of 13C and 15N and the carbon:nitrogen (C:N) and oxygen:carbon (O:C) stoichiometry of litterfall and fine roots as well as SOM in the forest floor and mineral soil. Tree species had a significant effect on SOM δ13C and δ15N reflecting significantly different signatures of litterfall and root inputs. Throughout the soil profile, δ13C and δ15N were significantly related to the C:N and O:C ratio which indicates that isotope enrichment with soil depth is linked to the turnover of organic matter (OM). Significantly higher turnover of OM in soils under deciduous tree species depended to 46% on the quality of litterfall and root inputs (N content, C:N, O:C ratio), and the initial isotopic signatures of litterfall. Hence, SOM composition and turnover also depends on additional—presumably microbial driven—factors. The enrichment of 15N with soil depth was generally linked to 13C. In soils under pine, however, with limited N and C availability, the enrichment of 15N was decoupled from 13C. This suggests that transformation pathways depend on litter quality of tree species.

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“…in the southwest, to balsam fir (Abies balsamea L.) or black spruce (Picea mariana Mill.) in the northeast of the study area (Houle et al, 2006;Marty et al, 2015). The soils in the watersheds are mainly orthic humo-ferric or ferro-humic podzols.…”

Section: Study Sites and Samplingmentioning

confidence: 99%

“…Soil sampling was conducted during the summer and fall of 2001 and 2002. Details about sampling procedure can be found elsewhere (Augustin et al, 2015a;Marty et al, 2015Marty et al, , 2017. Briefly, three soil pits were dug to a depth of about 1 m within each site.…”

Section: Study Sites and Samplingmentioning

confidence: 99%

Impact of Climate Change on Soil Hydro-Climatic Conditions and Base Cations Weathering Rates in Forested Watersheds in Eastern Canada

Houle

Marty

Augustin

et al. 2020

Front. For. Glob. Change

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Increases in mean annual air temperature (MAAT) and mean annual precipitation (MAP) are projected for north eastern North America, which will alter soil hydroclimatic conditions and hence the rate of many soil processes. Among them, chemical weathering of soil minerals is an essential source of base cations (BC) which controls the acid-base status of surface waters and is crucial for forest nutrition. In this modeling study, MAAT and MAP projections from a regional and a global climate models were first used to project changes in soil temperature (MAST) and soil water content (SWC) with the ForStem and ForHym models for 21 eastern Canadian forested catchments. The models predicted an increase in MAST by 2.03-2.05 • C and 2.87-3.42 • C for the 2041-2070 and 2071-2100 periods, respectively, and a small decrease (<5%) in SWC. In a second step, these projected changes in MAST and SWC were used to estimate changes in BC weathering rates (WR) and soil pH with the geochemical model PROFILE. The simulations indicated that BC WR would increase by 13-15% and 20-22% for the 2041-2070 and 2071-2100 periods, respectively. The increase in BC WR was accompanied by an increase not only in base cation concentrations, but also in soil pH at most sites, suggesting that future temperature increase has the potential to ameliorate the acid-base status and the fertility of soils in eastern Canada through its impact on WR.

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Effect of the Relative Abundance of Conifers Versus Hardwoods on Soil δ13C Enrichment with Soil Depth in Eastern Canadian forests

Cited by 13 publications

References 66 publications

Vertical distribution of carbon and nitrogen stable isotope ratios in topsoils across a temperate rainforest dune chronosequence in New Zealand

Vertical distribution of carbon and nitrogen stable isotope ratios in topsoils across a temperate rainforest dune chronosequence in New Zealand

The linkage of 13C and 15N soil depth gradients with C:N and O:C stoichiometry reveals tree species effects on organic matter turnover in soil

Impact of Climate Change on Soil Hydro-Climatic Conditions and Base Cations Weathering Rates in Forested Watersheds in Eastern Canada

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