摘要
为了探讨南方烟区酸性土壤的改良途径,通过吸附-解吸试验和淋溶试验,研究了石灰和聚丙烯酰胺(PAM)对植烟酸性土壤N素的吸附、解吸和迁移率的影响。结果表明:Langmuir方程可以很好地表征酸性土壤、石灰和PAM处理的酸性土壤对N的吸附特征;单独用石灰处理及同时用石灰和PAM处理均能增加植烟酸性土壤对N的吸附量、吸附常数和最大缓冲容量,以石灰含量为0.45%、PAM含量为0.1%的处理土壤吸附量最高,但随着PAM用量增加,吸附量下降;石灰和PAM处理的土壤对N的解吸率总体比对照低,但解吸量高于对照;施加石灰含量为0.45%、PAM含量为0.1%的处理,土壤能有效缓解NH4+-N、NO3--N向深层土壤迁移的趋势。
The nitrogen adsorption, desorption and leaching experiments were conducted to study the effects of lime and polyacrylamide on nitrogen adsorption, desorption and translocation in acid soil, so as to explore the improvement way of acid soil in the southern tobacco-grown area. The results showed that Langmuir isotherm equation could well describe the soil adsorption characteristics. Application of lime and PAM in acid soil could increase adsorption quantity, maximum adsorption quantity, adsorption capacity and maximum buffer capacity, and the adsorption quantity of nitrogen had reached the maximum at 0.45 % lime and 0. 1% PAM, then descended with PAM content increased. Application of lime and PAM in acid soil increased desorption quantity, but reduced desorption rate; added 0.45 % lime and 0. 1% PAM in acid soil could decrease NH4^＋ -N and NO3^- -N transporting from the upper layer to the lower layer of the soil column.
出处
《西南农业学报》
CSCD
北大核心
2012年第6期2198-2202,共5页
Southwest China Journal of Agricultural Sciences
基金
国家烟草专卖局重点项目"贵州特色烟叶的生态基础
突显技术研究与示范"(110200902064)
