摘要
采用土壤培养方法研究沼液灌溉对紫色土土壤环境的影响。结果表明,沼液灌溉后土壤pH值有所增加,但随灌溉时间增加会基本趋于稳定,沼液灌溉能够有效防治土壤酸化;土壤TN、TP含量在沼液灌溉后均有增加,但土壤TP含量随灌溉时间增加缓慢增加,土壤TN含量增加一段时间后达到最大值,随后呈下降趋势;旱作模式下沼液灌溉会使土壤有机质含量稍微增加,但水稻模式下有机质含量有少量下降;沼液灌溉后土壤重金属Cu、Zn、Pb、Cd的含量变化均不大,都未超过国家土壤环境二级标准,沼液灌溉在一定时期内不会引起土壤环境重金属污染。
The soil incubation method was used to study the impact of biogas slurry irrigation on soil environment in purple soil.The results showed that after the biogas slurry irrigation,the soil pH increased,but it tended to be stable with the increase of irrigation time.This indicated that the biogas slurry irrigation could effectively control soil acidification.Soil TN content and TP content increased,but soil TP content increased slowly with increasing irrigation time,soil TN content initially increased and then decreased with increasing irrigation time.Biogas slurry irrigation in dry farming mode could increase a spot of soil organic matter content,but in the mode of rice soil organic matter content had a little decrease.The soil heavy metals such as Cu,Zn,Pb,Cd content changed little,which they did not exceed the national soil environment secondary standard after biogas slurry irrigation.Results indicated that biogas slurry irrigation did not cause heavy metal pollution in soil environment during a certain period of time.
出处
《水土保持学报》
CSCD
北大核心
2013年第3期174-177,共4页
Journal of Soil and Water Conservation
基金
国家"十一五"科技支撑计划项目(2010BAD03B03)
重庆市科技攻关重点项目(CSTC2009AB7027)
关键词
沼液灌溉
紫色土
重金属
biogas slurry irrigation
purple soil
heavy metal
