Fate of Cd in Agricultural Soils: A Stable Isotope Approach to Anthropogenic Impact, Soil Formation, and Soil-Plant Cycling
| Autor: | Martin Imseng, Katy Murphy, Moritz Bigalke, Michael Müller, Emmanuel Frossard, Mark Rehkämper, Matthias Wiggenhauser, Katharina Kreissig, Wolfgang Wilcke, Anita Keller |
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| Rok vydání: | 2018 |
| Předmět: |
Technology
010504 meteorology & atmospheric sciences Environmental Sciences & Ecology 010501 environmental sciences 01 natural sciences Soil Engineering HEAVY-METALS Isotope fractionation Isotopes SOUTHERN NORWAY TRACE-ELEMENTS Environmental Chemistry Soil Pollutants PEAT BOG Fertilizers 0105 earth and related environmental sciences 2. Zero hunger Topsoil Science & Technology Stable isotope ratio FRACTIONATION ATMOSPHERIC DEPOSITION Engineering Environmental Soil classification General Chemistry 15. Life on land Manure Soil contamination LEAD ISOTOPES CADMIUM FLUXES 13. Climate action Environmental chemistry LAKE-SEDIMENTS Soil water ZN Environmental science Soil fertility Life Sciences & Biomedicine Environmental Sciences Switzerland Cadmium |
| Zdroj: | Environmental sciencetechnology. 52(4) |
| ISSN: | 1520-5851 |
| Popis: | The application of mineral phosphate (P) fertilizers leads to an unintended Cd input into agricultural systems, which might affect soil fertility and quality of crops. The Cd fluxes at three arable sites in Switzerland were determined by a detailed analysis of all inputs (atmospheric deposition, mineral P fertilizers, manure, and weathering) and outputs (seepage water, wheat and barley harvest) during one hydrological year. The most important inputs were mineral P fertilizers (0.49 to 0.57 g Cd ha–1 yr–1) and manure (0.20 to 0.91 g Cd ha–1 yr–1). Mass balances revealed net Cd losses for cultivation of wheat (−0.01 to −0.49 g Cd ha–1 yr–1) but net accumulations for that of barley (+0.18 to +0.71 g Cd ha–1 yr–1). To trace Cd sources and redistribution processes in the soils, we used natural variations in the Cd stable isotope compositions. Cadmium in seepage water (δ114/110Cd = 0.39 to 0.79‰) and plant harvest (0.27 to 0.94‰) was isotopically heavier than in soil (−0.21 to 0.14‰). Consequently, parent material weathering shifted bulk soil isotope compositions to lighter signals following a Rayleigh fractionation process (ε ≈ 0.16). Furthermore, soil-plant cycling extracted isotopically heavy Cd from the subsoil and moved it to the topsoil. These long-term processes and not anthropogenic inputs determined the Cd distribution in our soils. |
| Databáze: | OpenAIRE |
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