Abstract
Phosphorus (P) is an essential element in terrestrial ecosystems. Knowledge on the role of dust in the biogeochemical cycling of phosphorus is very limited with no quantitative information on aeolian (by wind) P fluxes from soils. The aim of this study is to focus on P cycling via dust emissions under common land-use practices in an arid environment by integration of sample analyses and aeolian experiments. The experiments indicate significant P fluxes by PM10 dust due to agricultural land use. Even in a single wind-dust event at moderate velocity (7.0 m s−1), P flux in conventional agricultural fields can reach 1.83 kg km−2, that accumulates to a considerable amount per year at a regional scale. The results highlight a negative yearly balance in P content (up to hundreds kg km−2) in all agricultural soils, and thus more P nutrition is required to maintain efficient yield production. In grazing areas where no P nutrition is applied, the soil degradation process can lead to desertification. Emission of P from soil dust sources has significant implications for soil nutrient resources and management strategies in agricultural regions as well as for loading to the atmosphere and global biogeochemical cycles.
Highlights
The results above highlight how aeolian erosion leads to a significant loss of bioavailable P from the soil
In order to examine how aeolian erosion affects the P balance in the soil, the inputs of P that enters the soil from external sources needs to be estimated
We assumed that once the PM10 fraction is emitted from the surface, it will be transported in the atmospheric boundary layer for a long distance from the source area[22]
Summary
The aim of this study is to focus on P cycling via dust emissions under common land-use practices in an arid environment by integration of sample analyses and aeolian experiments. The aim of this study is to estimate the potential of aeolian P emissions from soils under different conditions of land uses and wind velocities by integration of soil-dust sample analyses and aeolian experiments
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