Faculty of Sciences, Liverpool John Moores University, Liverpool L3 3AF, UK.
Environ Pollut. 2010 May;158(5):1644-51. doi: 10.1016/j.envpol.2009.12.006. Epub 2009 Dec 23.
Application of greenwaste compost to brownfield land is increasingly common in soil and landscape restoration. Previous studies have demonstrated both beneficial and detrimental effects of this material on trace element mobility. A pot experiment with homogenised soil/compost investigated distribution and mobility of trace elements, two years after application of greenwaste compost mulch to shallow soils overlying a former alkali-works contaminated with Pb, Cu and As (approximately 900, 200 and 500 mg kg(-1), respectively). Compost mulch increased organic carbon and Fe in soil pore water, which in turn increased As and Sb mobilization; this enhanced uptake by lettuce and sunflower. A very small proportion of the total soil trace element pool was in readily-exchangeable form (<0.01% As, <0.001% other trace elements), but the effect of compost on behaviour of metals was variable and ambiguous. It is concluded that greenwaste compost should be applied with caution to multi-element contaminated soils.
在土壤和景观修复中，将绿色废弃物堆肥应用于棕地越来越普遍。先前的研究表明，这种材料对微量元素迁移既有有益影响，也有有害影响。一项盆栽实验用均匀化的土壤/堆肥研究了浅层土壤上覆盖绿色废弃物堆肥覆盖物两年后的微量元素分布和迁移情况，这些浅层土壤位于以前受 Pb、Cu 和 As 污染的碱厂之上（分别约为 900、200 和 500 mg kg(-1)）。堆肥覆盖物增加了土壤孔隙水中的有机碳和铁，这反过来又增加了 As 和 Sb 的迁移；这增加了生菜和向日葵的吸收。土壤中微量元素总量的很小一部分处于可交换形式（<0.01%的 As，<0.001%的其他微量元素），但堆肥对金属行为的影响是多变和模糊的。因此，应谨慎将绿色废弃物堆肥应用于多元素污染土壤。
