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Estimating base cation weathering rates in Canadian forest soils using a simple texture-based model

Koseva, Ina ; Watmough, Shaun ; Aherne, Julian

Biogeochemistry, 2010, Vol.101(1), pp.183-196 [Periódico revisado por pares]

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  • Título:
    Estimating base cation weathering rates in Canadian forest soils using a simple texture-based model
  • Autor: Koseva, Ina ; Watmough, Shaun ; Aherne, Julian
  • Assuntos: Canada ; Forest soil ; Mineralogy ; PROFILE ; Soil texture ; Weathering
  • É parte de: Biogeochemistry, 2010, Vol.101(1), pp.183-196
  • Descrição: Mineral weathering is the primary source of long-term buffering capacity in soils and is important for forest nutrient sustainability. Regional assessments of weathering rates in Canada and the U.S. have employed an empirical clay-based Soil Texture Approximation (STA) owing to limited data availability, although the STA is rarely calibrated before application to a study area. Soil weathering rates estimated with the STA at 75 sites in Canadian forests (6–367 eq ha −1  year −1 ) were on average seven times lower than estimates obtained using the PROFILE model and when mineralogy was not available, the Analysis to Mineralogy model and parameter estimation (143–2,119 eq ha −1  year −1 ). Comparison with a catchment mass balance at a subset of sites in Ontario ( n  = 19) demonstrated the reliability of PROFILE weathering estimates. A revised (generalized) STA model for total base cation weathering was developed at the 75 study sites to incorporate soil silt content (%) and loss-on-ignition (LOI, %) ( BC w  = (1.73 + 0.03 ·  silt  − 0.06 ·  LOI ) · 1,000 ·  depth ). The model performance ( R adj 2  = 73%) and relative bias (−1%) suggested that the revised STA may have broad application to forest soils in Canada but may not necessarily be suited to all soil texture classes.
  • Idioma: Inglês

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