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为评估生物质灰渣等改良剂对红壤酸度的改良效果,通过土壤培养实验研究了生物质灰渣、磷灰石和石灰3种改良剂对红壤酸度的改良效应。结果表明,3种改良剂均能提高土壤p H和降低土壤交换性Al3+含量,其中,生物质灰渣在培养前期表现差异明显,随着培养时间延长,实验设定的生物质灰渣用量对土壤p H的影响差异不明显;石灰和磷灰石用量对土壤p H和土壤交换性Al3+含量影响显著。培养期间,添加改良剂后土壤p H保持上升趋势,且p H增幅随改良剂用量增加而增加。3种改良剂的施用均可提高土壤CEC和土壤交换性钙含量,用量为4500 kg·hm-2时达到最大值,生物质灰渣处理土壤CEC提高0.90 cmol·kg-1,土壤交换性钙提高1.11 cmol·kg-1;磷灰石处理土壤CEC提高2.17 cmol·kg-1,土壤交换性钙提高0.78 cmol·kg-1;石灰处理土壤CEC提高1.85 cmol·kg-1,土壤交换性钙提高3.47cmol·kg-1。生物质灰渣施用提高土壤速效磷和速效钾含量显著,4500 kg·hm-2用量时达到最大值,分别为19.49和225.00mg·kg-1;磷灰石施用提高土壤速效磷含量且随磷灰石用量增加而增加;石灰施用提高土壤速效磷和碱解氮含量。
In order to assess the effect of improving agent such as biomass ash on the acidity of red soil, the effect of three kinds of improver, biomass ash, apatite and lime, on the acidity of red soil was studied by soil culture experiment. The results showed that all the three amendments could improve the soil pH and reduce the soil exchangeable Al3 + content. Among them, biomass ash had obvious difference in the early stage of culture, with the increase of culture time, the amount of biomass ash The effect of soil pH was not obvious. The amount of lime and apatite had a significant effect on soil pH and soil exchangeable Al3 + content. During the cultivation period, soil pH increased with the addition of soil conditioner, and the increase of p H increased with the increasing amount of soil conditioner. The application of three amendments improved soil CEC and soil exchangeable calcium content, reached the maximum at 4500 kg · hm-2, CEC increased 0.90 cmol · kg-1 in soil treated with biomass ash, and soil exchangeable calcium Increased by 1.11 cmol · kg-1, CEC increased by 2.17 cmol · kg-1 in apatite soil, increased by 0.78 cmol · kg-1 in soil exchangeable soil, 1.85 cmol · kg-1 in lime-treated soil, and soil exchangeable calcium Increase 3.47cmol · kg-1. The application of biomass ash increased soil available phosphorus and available potassium, reached the maximum at 4500 kg · hm-2, which were 19.49 and 225.00 mg · kg-1, respectively. Apatite increased soil available phosphorus and increased with phosphorus The amount of graystone increases with the increase; Lime application increases the content of available phosphorus and alkaline solution nitrogen.