Diuron mineralisation in a Mediterranean vineyard soil: impact of moisture content and temperature
Diuron mineralisation in a Mediterranean vineyard soil: impact of moisture content and temperature
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DOI：
10.1002/ps.1971
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发表时间：
2010-09-01
影响因子：
4.1
通讯作者：
Martin-Laurent, Fabrice
中科院分区：
文献类型：
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作者：
El Sebai, Talaat;Devers, Marion;Martin-Laurent, Fabrice
背景：对每年暴露于该除草剂的地中海葡萄园土壤微生物群的敌草隆矿化能力进行了测量。评估了土壤湿度和温度对该微生物活性的影响。结果：土壤微生物群显示出矿化敌草隆。这种矿化活性与土壤含水量呈正相关，在5%时可忽略不计，在20%土壤含水量时可超过30%。根据用于拟合数据集的双高斯模型，最大矿化率的最佳温度/土壤湿度条件为 27.9 摄氏度/19.3%，最大矿化百分比的最佳温度/土壤湿度条件为 21.9 摄氏度/18.3%。估计了温度和土壤湿度变化对敌草隆矿化的影响。模拟干旱期对随后的敌草隆矿化具有抑制作用。当使用较高温度干燥（40 摄氏度与 28 摄氏度）或孵化（28 摄氏度与 20 摄氏度）土壤时，这种干旱效应更加明显。干旱条件下测得的敌草隆动力学参数不再与高斯模型估计的一致。结论：虽然土壤微生物群能够适应敌草隆矿化，但其活性强烈依赖于气候条件。这表明敌草隆在地中海气候下不会迅速降解，地中海耕地土壤可能会积累敌草隆残留物。 (C) 2010年化学工业学会
BACKGROUND: The diuron-mineralising ability of the microbiota of a Mediterranean vineyard soil exposed each year to this herbicide was measured. The impact of soil moisture and temperature on this microbial activity was assessed.RESULTS: The soil microbiota was shown to mineralise diuron. This mineralising activity was positively correlated with soil moisture content, being negligible at 5% and more than 30% at 20% soil moisture content. According to a double Gaussian model applied to fit the dataset, the optimum temperature/soil moisture conditions were 27.9 degrees C/19.3% for maximum mineralisation rate and 21.9 degrees C/18.3% for maximum percentage mineralisation. The impact of temperature and soil moisture content variations on diuron mineralisation was estimated. A simulated drought period had a suppressive effect on subsequent diuron mineralisation. This drought effect was more marked when higher temperatures were used to dry (40 degrees C versus 28 degrees C) or incubate (28 degrees C versus 20 degrees C) the soil. The diuron kinetic parameters measured after drought conditions were no longer in accordance with those estimated by the Gaussian model.CONCLUSION: Although soil microbiota can adapt to diuron mineralisation, its activity is strongly dependent on climatic conditions. It suggests that diuron is not rapidly degraded under Mediterranean climate, and that arable Mediterranean soils are likely to accumulate diuron residues. (C) 2010 Society of Chemical Industry