Sauras-Yera Teresa, Tent Joana, Ivanov Yuri, Hinton T G, Rauret Gemma, Vallejo Ramon
Departament Biologia Vegetal, Universitat de Barcelona, Diagonal 645, E-08028 Barcelona, Spain.
Environ Sci Technol. 2003 Oct 15;37(20):4592-6. doi: 10.1021/es026377h.
A field experiment was conducted within the 30-km zone of the Chernobyl Nuclear Power Plant to analyze whether the application of mulching reduced resuspension of 137Cs contaminated soil in oat (Avena sativa) crops. In 1993, we applied a mulch treatment at a dose of 200 g m(-2), and soil resuspension was measured by estimating soil loadings onto plant surfaces from Ti concentrations in plants. In 1994, two mulch doses were applied, 200 and 50 g m(-2), and we estimated the contribution of soil resuspension by using artificial resuspension collection devices (ARC). In the 1993 experiment between 4.6 and 34.4% of the plant's total 137Cs contamination was attributed to external soil contamination. The mean amount of soil-derived 137Cs attached to vegetation was 124.7 Bq kg(-1)(plant) in control plots and 53.7 Bq kg(-1)(plant) in mulched plots. In the 1994 experiment, covering the soil with a mulch layer decreased the radiocesium content in ARC by about 70%. Results obtained in these experiments suggest that soil resuspension was a significant mechanism for plant contamination and that mulching was effective in reducing that contamination.
在切尔诺贝利核电站30公里区域内进行了一项田间试验，以分析覆盖物的应用是否减少了燕麦（ Avena sativa ）作物中受137Cs污染土壤的再悬浮。1993年，我们以200 g m(-2)的剂量进行了覆盖处理，并通过估计植物中Ti浓度来测量植物表面的土壤负载量，从而测定土壤再悬浮情况。1994年，施用了两种覆盖剂量，分别为200和50 g m(-2)，我们使用人工再悬浮收集装置（ARC）来估计土壤再悬浮的贡献。在1993年的试验中，植物总137Cs污染的4.6%至34.4%归因于外部土壤污染。对照地块中附着在植被上的土壤源137Cs平均量为124.7 Bq kg(-1)(植物)，覆盖地块中为53.7 Bq kg(-1)(植物)。在1994年的试验中，用覆盖层覆盖土壤使ARC中的放射性铯含量降低了约70%。这些试验获得的结果表明，土壤再悬浮是植物污染的一个重要机制，并且覆盖物在减少这种污染方面是有效的。
