| Autor: |
S. Millin, Sylvie Bussiere, N. Fanin, Noémie Janot, Jean-Yves Cornu, Laurence Denaix, M. Sourzac, Cécile Coriou, F. Ouedraogo, Edith Parlanti |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
30th International Meeting on Organic Geochemistry (IMOG 2021). |
| DOI: |
10.3997/2214-4609.202134202 |
| Popis: |
Summary Copper-based fungicides are potentially toxic to organisms because of their huge amounts in vineyard soils resulting from almost 150 years of massive use. Dissolved organic matter (DOM) depending on its quality can complex copper and influence its toxicity. DOM quality and quantity are related to soil organic matter (SOM) decomposition under the impact of environmental factors like temperature. We aimed in this study to assess the effect of temperature, depending on soil nature, on the quantity and quality of DOM originating from SOM mineralization. A 60-day incubation at 20°C and 30°C was conducted on two soils differing in type and C/N ratio. DOM absorbance and fluorescence and hydrolytic enzymatic activities were analyzed all along the experiment. The nature of soils affected the measured variables more than the temperature. Nevertheless, in the highest C/N soil, the hydrolytic enzymes activities decreased at t60 for the 20°C temperature suggesting a shift from hydrolytic to oxidative enzymes abundance. It is concluded that the difference between the two studied temperatures was not enough to observe clear changes on DOM properties and SOM decomposition, but that eventual effects could appear in a longer experience and more contrasted temperatures. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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