添加作物秸秆对土壤酸度变化的影响

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。

Effects of Crop Straw on Amelioration of Soil Acidity

Six-month culture test was carried out in the laboratory conditions, and changes of soil a-cidity were studied when corn, soybean and peanut straw was added. The results show that soil pH value did not change regularly with the changes of adding amount. Addition of 20 g/kg peanut straw had the best effect on amelioration of soil, and the maximal increase of soil pH was 0. 97;Addition of crop straw had the best reducing effect on soil exchangeable acid and exchangeable Al3+, 0. 37 cmol/kg and 0. 34 cmol/kg lower than the control respectively;Soil exchangeable calcium and salt base saturation were higher than the control. Correlation analysis shows that addition of crop straw could increase content of exchangeable Ca2+and exchangeable K+, and soil pH was significant-ly positively correlated with exchangeable calcium, salt base saturation and cation exchange capaci-ty, but not correlated with organic matter. Therefore, addition of the 3 kinds of crop straw can re-lieve the progress of soil acidification.