摘要:
通过室内模拟培养实验,研究赤红壤中添加富含铝盐的造纸污泥堆肥后,土壤中活性铝的释放特性.实验结果表明:模拟培养过程中,总酸溶性铝和总单核铝浓度随培养时间总体呈下降趋势,初期下降显著,且添加堆肥各处理的降幅均高于CK,其中20%PSC分别降低61.64%和60.32%,降幅最大;经过60d培养后,添加堆肥各处理活性铝浓度与CK差异不显著;添加造纸污泥堆肥后,土壤中的pH值、有机质、有效磷均显著增加,这些因素导致土壤中铝活性的降低,且总单核铝是土壤中活性铝的主要存在形态.
Abstract:
The aim of this study was to find the release behavior of active aluminum in red soil added with paper mill sludge compost(PSC)by simulating cultivating experiment. The result showed that active aluminum concentration decreased during cultivating,especially in the initial stage(0—10d); the active aluminum concentration of CK reduced less than other treatments added with PSC and 20% PSC decreased most greatly,which was about 60% ; at the end of cultivating,the active aluminum concentration of treatments added with PSC was almost equal to the original red soil,so that there was almost no aluminum pollution when applying PSC in agriculture; the decrease of active aluminum in soil with PSC was because of the high pH,OC concentration and effective Phosphate concentration in PSC; what's more,the proportion of most active aluminum to total active aluminum(by weight)was more than 50% in all treatments except CK.
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