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Selenium cycling through agricultural grasslands in the UK: budgeting the role of the atmosphere

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<mark>Journal publication date</mark>1/04/1991
<mark>Journal</mark>Science of the Total Environment, The
Issue number1
Number of pages23
Pages (from-to)89-111
Publication StatusPublished
<mark>Original language</mark>English


Two idealised Se budget scenarios have been generated to assess the role of atmospheric cycling on the Se status of UK agricultural grasslands. Based on a thorough literature review, the budgets demonstrate that varying the factors for losses by volatilisation from plants and soils or inputs by deposition may significantly affect the net balance of a grassland. The contribution of wet, dry, vapour and particulate deposition inputs to the soil-herbage system are assessed and are thought to be dominated by a soluble form in wet deposition. The total input is calculated to be typically in the range 0.2-0.7 mg m-2 year-1. Volatile losses from the soil are difficult to derive accurately, but are estimated to range between 0.1 and 10 mg m-2 year-1. The budget suggests there is a net input of Se to herbage from the atmosphere, even in remote/rural locations, where inputs are generally low. The implications for the availability of Se to plants and grazing livestock are briefly considered.