Long term simulations of macronutrients (C, N and P) in UK freshwaters
نویسندگان
چکیده
Over the last two centuries, landscape of many industrialised nations has been transformed by spread and intensification agriculture, atmospheric pollution, human waste (rising in line with population growth), now changes climate. The research presented here aims to understand quantify how these long-term have impacted UK freshwaters flux macronutrients sea. Long Term Large Scale (LTLS) Freshwater Model used readily-available driving data (climate, land-use, nutrient inputs, catchment topography) UK's macronutrient histories on freshwater stores fluxes. Model-reconstructed sources fluxes carbon, nitrogen phosphorus (C, N P) from 1800 2010 indicate that rapid increase use agricultural fertilisers after second world war, rising population, led a rise & P rivers. During this period, modelling shows dominant source rivers changed improved grassland arable, dissolved export quadrupled, increased ~600%, despite water treatment. simulations also net storage nitrates groundwater between 1940s 1990s, release coastal waters post-1990; but retention later C&P are less significant. Overall, indicates >75% C, entering goes directly waters, 15–20% C removed river processes. These results constitute first process-based integrated assessment change at national scale. LTLS approach provides methodology develop fully-coupled global models terrestrial, freshwater, marine processes can take account land-management
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ژورنال
عنوان ژورنال: Science of The Total Environment
سال: 2021
ISSN: ['0048-9697', '1879-1026']
DOI: https://doi.org/10.1016/j.scitotenv.2021.145813