期刊论文

The Short-term Changes of Soil pH and Available As by Fertilizing Urea in Contaminated Soils

中文

土壤通报

0564-3945

2008

39

6

1441-1444

10.3321/j.issn:0564-3945.2008.06.045

本校为第一机构

砷污染土壤在我国较为常见,是影响农作物生产的主要环境胁迫因子之一.本试验对两种砷污染土壤施用不同的尿素浓度后的研究表明:两种污染土壤的pH值在短期内都随着施入尿素浓度的增大而急剧上升,交换性As随着施用尿素浓度的增大同步增加.动态试验证实,pH值上升的现象是短期的,pH值在达到最大值后,缓慢下降,pH值下降幅度最大的阶段在3～4周时段;交换性As的含量与土壤pH值的变化密切相关,其变化趋势与土壤pH值呈正相关.生物毒理结果显示:短期内,施用尿素能显著增加玉米(Z.Mays L.)苗吸收污染的土壤中As.

As-contaminated soils are widely spread in China. It is a major environmental stress factor which limits agricultural produetion. The experimental results from two As-contaminated soils applied different urea concentrations showed that soil pH increased quickly with increasing urea concentrations during a short-term period. Exchangeable As in soils increased sharply with increasing urea concentrations. This results were from soil pH variation induced by urea addition. There was a positive relationship between the soil pH and exchangeable As. Th...