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- W2090831723 abstract "Critical loads are strongly dependent on the rate of release of base cations from the soil matrix. This study compares five commonly used methods for estimating weathering rates at five acid-sensitive catchments across Nova Scotia, Canada. Three of the methods (Zr Depletion, Clay Content, and the PROFILE model) are based on soil profiles and consider only the rooting zone, whereas the two remaining methods (the soil acidification model MAGIC and catchment Mass Balance Deficit) are catchment-based, and account for contributions from all soils within a catchment. Each weathering estimate method resulted in similar values among the five catchments, indicating similar sensitivity to acidic deposition among the study areas. Base cation weathering estimates were very low using the three soil profile-based methods, with rates varying from 3 to 13 mmolc m− 2 a− 1. In contrast, catchment-based methods predicted base cation weathering rates an order of magnitude higher (60 to 155 mmolc m− 2 a− 1), possibly due to spatial heterogeneity of the soil deposits, and contributions from deeper soil (till). Critical load (sulphur and nitrogen) estimates using the profile-based weathering rates indicate that critical loads for forest soils are currently exceeded at all catchments by 23 to 61 mmolc m− 2 a− 1. Predicted future reductions in acidic deposition should reduce the magnitude of critical load exceedance, but will not result in the catchments reaching a non-exceeded state." @default.
- W2090831723 created "2016-06-24" @default.
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- W2090831723 date "2006-12-01" @default.
- W2090831723 modified "2023-10-16" @default.
- W2090831723 title "A comparison of weathering rates for acid-sensitive catchments in Nova Scotia, Canada and their impact on critical load calculations" @default.
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- W2090831723 doi "https://doi.org/10.1016/j.geoderma.2006.06.004" @default.
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