Soil organic nitrogen cycling increases with temperature and precipitation along a boreal forest latitudinal transect

Philben, Michael; Ziegler, Susan E.; Edwards, Kate A.; Kahler, Raymond; Benner, Ronald

doi:10.1007/s10533-016-0187-7

Cited by 44 publications

(87 citation statements)

References 57 publications

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“…In WLD sediments, the most enriched amino acids with diagenesis are Gly, Asp, and alanine while the most depleted amino acids include leucine, Phe, isoleucine, and arginine (Figure a). This finding is consistent with the alteration that occurs in soils, sinking marine particles, and lake sediments (Dauwe et al, ; Menzel et al, ; Philben et al, ), and the DI is positively correlated with AA‐N ( r 2 = 0.42, p < 0.05; Figure b), where the less degraded OM has a high DI and a greater contribution of amino acid nitrogen to the total nitrogen. Therefore, the overall evidence suggests that the change in amino acid composition is due to degradation.…”

Section: Discussionsupporting

confidence: 86%

“…Although we cannot confirm that what we quantified is beta‐aminobutyric acid, its presence in the sampled in situ vegetation (Table ) and its increase in concentration along with Hyp and VSC OC suggests that this is likely the case. The simultaneous increase in plant and microbial biomarkers differs from other soils in which bacterial OC replaces plant OM with depth (Philben et al, ). Root material was detected down to ~20 cm from the top of each core at sites 1, 2, and 3, but the lack of replacement of plant OM by microbial OM suggests these young soils are not yet mature (Schmidt et al, ; Torn et al, ).…”

Section: Discussionmentioning

confidence: 97%

“…Total lignin (VSC) and Hyp often become enriched during diagenesis due to selective preservation (Philben et al, ; Wedin et al, ), but these biomarkers decrease relative to the total OC from the surface to deep sediments in WLD. Additionally, the contribution of microbial‐OM to total OC increases during soil development (Philben et al, ; Schmidt et al, ; Tremblay & Benner, ). MurA and DAPA, two microbial biomarkers measured in this study, do not show evidence of microbial‐OM enrichment from surface to deep sediments.…”

Section: Discussionmentioning

confidence: 99%

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Factors Controlling Storage, Sources, and Diagenetic State of Organic Carbon in a Prograding Subaerial Delta: Wax Lake Delta, Louisiana

et al. 2019

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Wax Lake Delta, southern Louisiana, is a coastal delta that formed following the dredging of a river channel in 1941 and is a field model for investigating the geomorphology, ecology, carbon dynamics, and carbon storage capacity in young prograding deltas. However, it is unknown how the transition from subaqueous to subaerial sediments affects the sources and quality of the sequestered carbon. We investigated these variations within the sediments of Wax Lake Delta using amino acid, lignin, and stable carbon isotope compositions of the organic matter (OM). A principal component analysis of these proxies highlighted variability in organic carbon (OC) composition with changes in elevation. The transition from subaqueous to subaerial sediments at 0‐cm mean lower low water is an important component of the OM composition. In addition to the changes observed for OM source and quality, the OC loadings (OC/SA; mg C/m2) also increase as the delta aggrades and accumulates sediments with loadings typical of delta topsets and mobile mud banks (OC/SA < 0.4) to riverine sediments (0.5 < OC/SA < 1) and eventually to highly productive regions (OC/SA > 1). Linking this multiproxy approach with environmental variables such as elevation provides a path for incorporating OM dynamics into geomorphic models.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Factors Controlling Storage, Sources, and Diagenetic State of Organic Carbon in a Prograding Subaerial Delta: Wax Lake Delta, Louisiana

et al. 2019

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“…More southern regions were characterized by both higher MAT (0.0–5.2°C) and MAP (1040–1570 mm/a), resulting in similar soil moisture across the transect (Appendix S2). Warmer forests furthermore exhibited lower C:N in needle foliage, litter, and soils consistent with accelerated nitrogen (N) cycling and greater N availability in the warmer forests (Philben, Ziegler, Edwards, Kahler, & Benner, ). These trends are consistent with the anthropogenic changes that are predicted to occur in this ecosystem over the next decades, that is, higher temperatures, precipitation, and allochthonous N inputs (Gruber & Galloway, ; Price et al., ; van Oldenborgh et al., ).…”

Section: Methodsmentioning

confidence: 98%

The origin of soil organic matter controls its composition and bioreactivity across a mesic boreal forest latitudinal gradient

Kohl

Philben

Edwards

et al. 2017

Global Change Biology

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Warmer climates have been associated with reduced bioreactivity of soil organic matter (SOM) typically attributed to increased diagenesis; the combined biological and physiochemical transformation of SOM. In addition, cross-site studies have indicated that ecosystem regime shifts, associated with long-term climate warming, can affect SOM properties through changes in vegetation and plant litter production thereby altering the composition of soil inputs. The relative importance of these two controls, diagenesis and inputs, on SOM properties as ecosystems experience climate warming, however, remains poorly understood. To address this issue we characterized the elemental, chemical (nuclear magnetic resonance spectroscopy and total hydrolysable amino acids analysis), and isotopic composition of plant litter and SOM across a well-constrained mesic boreal forest latitudinal transect in Atlantic Canada. Results across forest sites within each of three climate regions indicated that (1) climate history and diagenesis affect distinct parameters of SOM chemistry, (2) increases in SOM bioreactivity with latitude were associated with elevated proportions of carbohydrates relative to plant waxes and lignin, and (3) despite the common forest type across regions, differences in SOM chemistry by climate region were associated with chemically distinct litter inputs and not different degrees of diagenesis. The observed climate effects on vascular plant litter chemistry, however, explained only part of the regional differences in SOM chemistry, most notably the higher protein content of SOM from warmer regions. Greater proportions of lignin and aliphatic compounds and smaller proportions of carbohydrates in warmer sites' soils were explained by the higher proportion of vascular plant relative to moss litter in the warmer relative to cooler forests. These results indicate that climate change induced decreases in the proportion of moss inputs not only impacts SOM chemistry but also increases the resistance of SOM to decomposition, thus significantly altering SOM cycling in these boreal forest soils.

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“…Increases in alkyl to O-alkyl ratios with depth were indicative of the preferential decomposition of carbohydrates ( Figure 5D) and are consistent with the other diagenetic indicators. Minor latitudinal changes were observed in the C:N and alkyl to O-alkyl ratios of the organic horizons, and this appears to be due to differences in the composition of litter inputs (Kohl et al, Personal Communication;Philben et al, 2016).…”

Section: Mean Residence Time and Extent Of Alteration Of Soil C Indicmentioning

confidence: 99%

Climate Warming Can Accelerate Carbon Fluxes without Changing Soil Carbon Stocks

et al. 2017

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Soil organic nitrogen cycling increases with temperature and precipitation along a boreal forest latitudinal transect

Cited by 44 publications

References 57 publications

Factors Controlling Storage, Sources, and Diagenetic State of Organic Carbon in a Prograding Subaerial Delta: Wax Lake Delta, Louisiana

Factors Controlling Storage, Sources, and Diagenetic State of Organic Carbon in a Prograding Subaerial Delta: Wax Lake Delta, Louisiana

The origin of soil organic matter controls its composition and bioreactivity across a mesic boreal forest latitudinal gradient

Climate Warming Can Accelerate Carbon Fluxes without Changing Soil Carbon Stocks

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