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在实验室条件下进行6个月的培养试验,研究了添加大豆、花生和玉米秸秆的土壤酸度变化。结果表明:在培养结束时,添加3种作物秸秆的土壤pH并不随着添加量的增加而呈现有规律的变化;添加大豆秸秆20 g/kg对改良酸性土壤的效果最好,提升的幅度最大,为0.97;对交换性酸、交换性Al~(3+)的降低效果最好,与对照相比降低了0.37 cmol/kg和0.34 cmol/kg;土壤交换性钙和盐基饱和度均高于对照;相关分析表明:添加3种作物秸秆能够明显提高土壤中交换性钙和交换性钾的含量;土壤的pH与交换性钙、盐基饱和度、阳离子交换量呈显著正相关,而与土壤有机质含量相关性不显著;表明添加3种作物秸秆均可以有效地缓解土壤的酸化进程。
A six-month culture experiment was conducted under laboratory conditions to study the changes in soil acidity with the addition of soybean, peanut and corn stover. The results showed that at the end of culture, soil pH did not change regularly with the addition of three kinds of crop stalks. Adding soybean straw 20 g / kg was the best, improving the most , Which was 0.97. The exchangeable acid and exchangeable Al ~ (3 +) had the best reduction effect, which was reduced by 0.37 cmol / kg and 0.34 cmol / kg compared with the control, respectively. Both exchangeable calcium and basal saturation The correlation analysis showed that adding three kinds of crop stalks significantly increased the exchangeable and exchangeable potassium contents in soil. The soil pH was positively correlated with exchangeable calcium, base saturation and cation exchange capacity, The correlation of soil organic matter content was insignificant. It indicated that adding three kinds of crop stalks could effectively alleviate the acidification process of soil.