稻壳制备的生物质炭对红壤和黄棕壤酸度的改良效果

Effects of Rice-Hull-Based Biochar Regulating Acidity of Red Soil and Yellow Brown Soil

采用低温热解方法制备稻壳炭,通过室内培养试验研究稻壳炭在20 g.kg-1加入量水平下对酸性红壤和黄棕壤的改良效果。结果表明,加入稻壳炭后,红壤和黄棕壤的pH值均较不加稻壳炭的对照处理有不同程度的增加。加入稻壳炭降低了红壤和黄棕壤交换性酸和交换性铝含量,增加了土壤的交换性盐基数量,提高了土壤的盐基饱和度。加入稻壳炭能显著降低红壤和黄棕壤中有毒形态铝含量。稻壳炭对红壤酸度的改良效果优于黄棕壤。

Biochar,prepared out of rice hull through low temperature pyrolysis,was applied into red soil and yellow brown soil at a rate of 20 g·kg-1.Then the soils were incubated in the laboratory to check effect of the application on soil acidity.It was found that the incorporation of rice hull char increased pH in both soils to some extent over the control,mainly by decreasing the contents of exchangeable acid and exchangeable Al,and increasing the content of exchangeable bases and the base saturation.The incorporation of rice hull char also resulted in decline of toxic species of Al obviously in soil solutions,which suggests that the addition of rice hull char could alleviate aluminum toxicity in acid soils to plants.The ameliorating effect of rice hull char was greater on red soil than on yellow brown soil.