Fate of metals in a biosolids-amended forest soil following conversion of the land for agricultural usage
We examined the fate of metals in a Pinus radiata plantation forest soil treated with metal-spiked biosolids following simulated conversion of the land back for agricultural use. Mixing of the forest litter into the underlying mineral soil resulted in high con-centrations of metals (Cu, Ni and Zn) in easily extractable forms. There was also little change in these concentrations during a subsequent 2- year incubation of the samples. Soil solution concentrations of these metals were also enhanced substantially by the various original biosolids treatments. Chemical speciation of the soil solutions using WHAM 6 showed that whereas solution Cu was dominated by organic complexes, most Ni and Zn was present as Ni<2+> and Zn<2+> , with generally less than 5％ of these elements present as organic complexes. The results from the study are discussed in relation to the possible consequences of growing agricultural crops on land converted from forest soils that have previously received applications of biosolids.
Biosolids Metals Forest Land conversion Soil solution Speciation
R. G McLaren L. M. Clucas
Centre for Soil and Environmental Sciences, Agriculture and Life Sciences Division, PO Box 84, Lincoln University, Canterbury, New Zealand
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
93-94
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）