摘要
聚丙烯酰胺(PAM)在农业上作为抗侵蚀剂、保水剂被广泛应用,但施用后对土壤养分保持和释放的影响研究较少。本文采用向土壤(土娄土)中添加不同比例(0.1%,0.2%,0.4%占土壤的比例)的PAM溶液,通过磷素等温吸附解吸试验,探讨了PAM对磷素在土壤中吸附和解吸的影响。结果表明,和原土样相比,土壤经PAM处理后抑制了土壤对磷的物理吸附,导致吸附量减小,最大吸附量(Xm)降低,而对磷素在土壤中的化学吸附影响较小,被吸附磷尤其是物理吸附磷的解吸率升高。
Polyaerylamide＇is widely used as soil conditioner to improve soil capacity for water retention and antierosion, while its impact on soil nutrients＇ retention and release is not clear. In this paper, Lou soil was amended with PAM at varied ratios of 0.1%, 0.2 % and 0.4%, and technique of phosphorus isotherm absorption and desorption was employed to study the effect of PAM on phosphorus retention and release in Lou soil. The results showed that PAM amended with soil can prohibit the physical absorption of phosphorus and led to decrease of absorption amount and maximum adsorption amount （Xm）, but the effect PAM on phosphorus chemical absorption is small. Soil amended with PAM increase the release of absorbed phosphorus, especially for the physical absorbed phosphorus.
出处
《水土保持学报》
CSCD
北大核心
2006年第1期87-90,共4页
Journal of Soil and Water Conservation
基金
陕西省自然科学基金(2003C106)
西北农林科技大学青年基金资助项目
关键词
磷素
吸附
解吸
塿土
PAM
phosphorus
adsorption and desorption
Lou soil
polyacrylamide（PAM）
