Centre for Environmental Risk Assessment and Remediation, Division of Information Technology, Engineering and the Environment, University of South Australia, Mawson Lakes Campus, South Australia 5095, Australia.
Environ Sci Pollut Res Int. 2012 Mar;19(3):636-45. doi: 10.1007/s11356-011-0592-3. Epub 2011 Sep 4.
The study examines if a short period of reaction after addition of biosolids to soils can reduce the solubility and potential phytotoxicity of biosolid-borne Zn and Cu.
The effects of period of aging (zero, 60, and 120 days) of biosolids (applied at 0, 10, 20, and 30 g kg⁻¹) with an acid, neutral, or alkaline soil on pH and concentrations of Zn, Cu, and dissolved organic C in solution over a 60-day growth period of spinach were investigated using Rhizon pore water samplers.
In the acid and neutral soils, increasing aging period markedly reduced the concentrations of Zn and Cu in solution and there were concomitant increases in solution pH. The effect was much less pronounced in the alkaline soil. Soluble Zn and Cu concentrations were generally positively correlated with dissolved organic C concentrations, negatively correlated with pH in the alkaline and neutral soils but positively correlated with pH in the acid soil. Spinach yields were lower in the acid than neutral and alkaline soils and tended to increase with increasing rates of biosolids in all three soils. The concentrations of tissue Zn and Cu were notably high in shoots of plants grown in the acid soil. For all biosolid-amended soils, the concentrations of tissue Cu were lower in plants grown after 60 days rather than no aging.
Following biosolids applications to soils, an aging period of only a few months is likely to lower the solubility, and potential phytotoxicity, of biosolid-borne Zn and Cu particularly in acid and neutral soils.
本研究考察了在向土壤中添加生物固体后短时间的反应是否可以降低生物固体携带的 Zn 和 Cu 的溶解度和潜在的植物毒性。
使用 Rhizon 孔隙水采样器研究了生物固体（以 0、10、20 和 30 g kg⁻¹ 的量施用）在添加到具有酸性、中性或碱性土壤后的老化期（零、60 和 120 天）对菠菜生长 60 天期间土壤溶液中 pH 值和 Zn、Cu 和溶解有机 C 浓度的影响。
在酸性和中性土壤中，随着老化期的增加，溶液中 Zn 和 Cu 的浓度显著降低，同时溶液 pH 值升高。在碱性土壤中，这种影响则不那么明显。可溶性 Zn 和 Cu 浓度通常与溶解有机 C 浓度呈正相关，与碱性和中性土壤中的 pH 值呈负相关，但与酸性土壤中的 pH 值呈正相关。在酸性土壤中，菠菜的产量低于中性和碱性土壤，并且在所有三种土壤中，随着生物固体添加率的增加而趋于增加。在酸性土壤中生长的植物的地上部分组织中 Zn 和 Cu 的浓度明显较高。对于所有添加生物固体的土壤，与无老化相比，在老化 60 天后，植物组织中 Cu 的浓度较低。
在向土壤中添加生物固体后，仅几个月的老化期可能会降低生物固体携带的 Zn 和 Cu 的溶解度和潜在的植物毒性，特别是在酸性和中性土壤中。
