Tracing changes in base cation sources for Arctic tundra vegetation upon permafrost thaw

Mauclet, Elisabeth; Hirst, Catherine; Monhonval, Arthur; Stevenson, Emily; Merlin, Gérard; Villani, Maëlle; Dailly, Hélène; Schuur, Edward A. G.; Opfergelt, Sophie

doi:10.1016/j.geoderma.2022.116277

Cited by 4 publications

(5 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4), with higher elemental concentrations in the mineral soil horizons originating from the mineral constituents. In particular, the mineral phases observed at EML include primary minerals (i.e., quartz, mica, K-feldspar, plagioclase, and amphibole) and secondary minerals (i.e., kaolinite, vermiculite, and illite; Mauclet et al, 2023). While some secondary minerals (such as clay minerals Al and Fe oxides) may directly contribute to the soil exchange complex, primary minerals constitute a soil reserve in potentially weatherable minerals that may release base cations into the soil solution.…”

Section: Resultsmentioning

confidence: 99%

“…This relationship between ALT and OLT can be explained by the low thermal diffusivity and conductivity of the organic matter (Adams, 1973;Farouki, 1981) that insulates the soil (Decharme et al, 2016;Lawrence and Slater, 2008) and thereby influences the permafrost thaw depth. The mineralogy of the soils from this site is similar, and mineral phases observed are plagioclase, K-feldspar, amphibole, quartz, muscovite, vermiculite, kaolinite, and illite (Mauclet et al, 2023). Soils were sampled to a maximum depth of 120 cm and subdivided into 5 to 10 cm horizons.…”

Section: Study Area and Samplingmentioning

confidence: 94%

“…3). Below the organic-mineral transition, given that the concentration in organic carbon decreases and the presence of clay minerals is verified (vermiculite, kaolinite, and illite; Mauclet et al, 2023), the contribution from the clay minerals to the CEC increases.…”

Section: Change In Cec Distribution and Cec Density With Soil Constit...mentioning

confidence: 99%

“…For instance, the more deeply rooted graminoids first access the newly thawed soil horizons at depth (Hewitt et al, 2019) and thereby first benefit from these newly thawed pools of nutrients. Nevertheless, plant strategies are complex, and woody shrubs may also benefit from the deep release of nutrients upon further graminoid nutrient cycling and the nutrient transfer from deep soil horizons to surface litterfall deposition (Mauclet et al, 2023). Permafrost thaw also creates localized variability in moisture conditions as thermokarst areas accumulate moisture while higher areas become drier (Jorgenson and Osterkamp, 2005).…”

Section: Projection Of Exchangeable Base Cations Upon Permafrost Thaw...mentioning

confidence: 99%

See 3 more Smart Citations

Quantifying exchangeable base cations in permafrost: a reserve of nutrients about to thaw

Mauclet,

Villani,

Monhonval

et al. 2023

Earth Syst. Sci. Data

Self Cite

View full text Add to dashboard Cite

Abstract. Permafrost ecosystems are limited in nutrients for vegetation development and constrain the biological activity to the active layer. Upon Arctic warming, permafrost thaw exposes large amounts of soil organic carbon (SOC) to decomposition and minerals to weathering but also releases organic and mineral soil material that may directly influence the soil exchange properties (cation exchange capacity, CEC, and base saturation, BS). The soil exchange properties are key for nutrient base cation supply (Ca2+, K+, Mg2+, and Na+) for vegetation growth and development. In this study, we investigate the distributions of soil exchange properties within Arctic tundra permafrost soils at Eight Mile Lake (Interior Alaska, USA) because they will dictate the potential reservoir of newly thawed nutrients and thereby influence soil biological activity and vegetation nutrient sources. Our results highlight much lower CEC density in surface horizons (∼9400 cmolc m−3) than in the mineral horizons of the active layer (∼16 000 cmolc m−3) or in permafrost soil horizons (∼12 000 cmolc m−3). Together, with the overall increase in CEC density with depth and the overall increase in BS (percentage of CEC occupied by exchangeable base cations Ca2+, K+, Mg2+, and Na+) with depth (from ∼19 % in organic surface horizons to 62 % in permafrost soil horizons), the total exchangeable base cation density (Ca2+, K+, Mg2+, and Na+ in g m−3) is up to 5 times higher in the permafrost than in the active layer. More specifically, the exchangeable base cation density in the 20 cm upper part of permafrost about to thaw is ∼850 g m−3 for Caexch, 45 g m−3 for Kexch, 200 g m−3 for Mgexch, and 150 g m−3 for Naexch. This estimate is needed for future ecosystem prediction models to provide constraints on the size of the reservoir in exchangeable nutrients (Ca, K, Mg, and Na) about to thaw. All data described in this paper are stored in Dataverse, the online repository of Université catholique de Louvain, and are accessible through the following DOI: https://doi.org/10.14428/DVN/FQVMEP (Mauclet et al., 2022b).

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Study Area and Samplingmentioning

confidence: 94%

Section: Change In Cec Distribution and Cec Density With Soil Constit...mentioning

confidence: 99%

Section: Projection Of Exchangeable Base Cations Upon Permafrost Thaw...mentioning

confidence: 99%

See 2 more Smart Citations

Quantifying exchangeable base cations in permafrost: a reserve of nutrients about to thaw

Mauclet,

Villani,

Monhonval

et al. 2023

Earth Syst. Sci. Data

Self Cite

View full text Add to dashboard Cite

show abstract

“…The study area is poleward of the tree line, with low summer temperatures (an average of under 12 • C in July [41]), limited annual precipitation, and a short growing season [5]. The vegetation comprises mosses, lichens, dwarf shrubs, sedges, grasses, and rushes [5,42]. Notably, the vascular plant cover, including graminoid cover, shrubs, and trees, shows an increasing trend [5].…”

Section: Study Area and Periodmentioning

confidence: 99%

Arctic Greening Trends: Change Points in Satellite-Derived Normalized Difference Vegetation Indexes and Their Correlation with Climate Variables over the Last Two Decades

Seo,

Kim

2024

Remote Sensing

View full text Add to dashboard Cite

In this study, we utilized NDVI data from the moderate resolution imaging spectroradiometer (MODIS) alongside climatic variables obtained from a reanalyzed dataset to analyze Arctic greening during the summer months (June–September) of the last two decades. This investigation entailed a detailed analysis of these changes across various temporal scales. The data indicated a continuous trend of Arctic greening, evidenced by a 1.8% per decade increment in the NDVI. Notably, significant change points were identified in June 2012 and September 2013. A comparative assessment of NDVI pre- and post-these inflection points revealed an elongation of the Arctic greening trend. Furthermore, an anomalous increase in NDVI of 2% per decade was observed, suggesting an acceleration in greening. A comprehensive analysis was conducted to decipher the correlation between NDVI, temperature, and energy budget parameters to elucidate the underlying causes of these change points. Although the correlation between these variables was relatively low throughout the summer months, a distinct pattern emerged when these periods were dissected and examined in the context of the identified change points. Preceding the change point, a strong correlation (approximately 0.6) was observed between all variables; however, this correlation significantly diminished after the change point, dropping to less than half. This shift implies an introduction of additional external factors influencing the Arctic greening trend after the change point. Our findings provide foundational data for estimating the tipping point in Arctic terrestrial ecosystems. This is achieved by integrating the observed NDVI change points with their relationship with climatic variables, which are essential in comprehensively understanding the dynamics of Arctic climate change, particularly with alterations in tundra vegetation.

show abstract

Strontium isotopes trace the dissolution and precipitation of mineral organic carbon interactions in thawing permafrost

et al. 2023

View full text Add to dashboard Cite

Tracing changes in base cation sources for Arctic tundra vegetation upon permafrost thaw

Cited by 4 publications

References 76 publications

Quantifying exchangeable base cations in permafrost: a reserve of nutrients about to thaw

Quantifying exchangeable base cations in permafrost: a reserve of nutrients about to thaw

Arctic Greening Trends: Change Points in Satellite-Derived Normalized Difference Vegetation Indexes and Their Correlation with Climate Variables over the Last Two Decades

Strontium isotopes trace the dissolution and precipitation of mineral organic carbon interactions in thawing permafrost

Contact Info

Product

Resources

About