Does soil thinning change soil erodibility? An exploration of long-term erosion feedback systems
نویسندگان
چکیده
Abstract. Soil erosion rates on arable land frequently exceed the pace at which new soil is formed. This imbalance leads to thinning (i.e. truncation), whereby subsoil horizons and their underlying parent material become progressively closer surface. As a selective process subsurface often have contrasting properties original topsoil, truncation-induced changes might affect runoff formation through feedback system. However, potential interactions between truncation are poorly understood due lack of empirical data neglection long-term erodibility dynamics in simulation models. Here, we present novel model-based exploration system over period 500 years using measured from diversified database 265 agricultural profiles UK. For this, adapted Modified Morgan–Morgan–Finney model (MMMF) perform modelling experiment topography, climate, cover, crop management parameters were held constant throughout period. processes removed topsoil layers, gradually mixed into 0.2 m plough layer updated mass-balance mixing Further, estimated uncertainty simulations with forward error assessment. We found that modelled 99 % sensitive properties. The losses all except one truncation-sensitive displayed decelerating trend, depicted an exponential decay was largely explained by decreasing silt contents surface removal this more erodible particle size fraction presence clayey or sandy substrata. Moreover, increased residual stone armoured reduced detachment. Contrastingly, soils siltier continuously replenished readily material, prevented decline loss time. Although our results limited edaphoclimatic conditions represented data, as assumptions, demonstrated how can be erosion-induced These findings likely calculate lifespans make projections degradation.
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ژورنال
عنوان ژورنال: Soil
سال: 2023
ISSN: ['2199-398X', '2199-3971']
DOI: https://doi.org/10.5194/soil-9-71-2023