摘要
为研究生物炭、水分调节措施对污染土壤速效养分的影响,从而为利用水分调节措施进一步提高生物炭修复污染土壤效果提供理论依据,以施用生物炭的重金属污染土壤为研究对象,研究了水分调节对施用生物炭土壤阳离子交换量、土壤速效磷、速效钾和碱解氮含量的影响。实验结果表明:(1)低水平水分调节可提高供试土壤阳离子交换量、土壤速效磷、速效钾和碱解氮含量;(2)进一步增加土壤水分含量,则会降低土壤阳离子交换量、土壤速效磷、速效钾和碱解氮含量,尤其是土壤田间持水量为100%时,该处理阳离子交换量、土壤速效磷、速效钾和碱解氮含量比对照分别低30.2%、12.7%、31.3%和21.5%,与对照相比差异显著(P<0.05);(3)土壤pH随土壤水分含量呈不规则变化,且与对照相比差异不显著(P>0.05)。由此表明,对施用生物炭修复的污染土壤,适量增加土壤含水量,可增加污染土壤速效养分含量,过量增加则会降低土壤速效养分含量。
In order to study the influence of biochar and water regulation measures on available nutrients in polluted soil so as to provide a basis for using water regulation measures to promote the restoring effect of biochar on polluted soil,in this paper,heavy metal polluted soil with biochar was set as research object,the effects of biochar and water regulation on cation exchange capacity(CEC),available phosphorus(AP),available potassium(AK)and alkali-hydro nitrogen(AN)of soil with biochar were studied.The experimental results showed that:(1)water regulation of low levels could increase the contents of CEC,AP,AK and AN.(2)when the content of soil water increased to high levels,soil CEC,AP,AK and AN would decrease.Especially at 100% field capacity,soil CEC,AP,AK and AN were 30.2%,12.7%,31.3% and 21.5%,separately,lower than those of control,and the differences were significant(P<0.05).(3)Soil pH had irregular change with the changes of field capacity,and the differences were not significant compared with control(P>0.05).The results indicate that appropriate increase of soil water content can increase soil available nutrients,while overdose increase may decrease soil available nutrients.
作者
张兰
夏红霞
朱启红
夏洋漪
李强
吕伟国
ZHANG Lan;XIA Hong-xia;ZHU Qi-hong;XIA Yang-yi;LI Qiang;LÜWei-guo(Chongqing Chemical Industry Vocational College,Changshou 401228,Chongqing,China;Chongqing Key Laboratory of Environmental Materials&Remediation Technologies,Chongqing University of Arts and Sciences,Yongchuan 402168,Chongqing,China)
出处
《节水灌溉》
北大核心
2022年第4期60-64,76,共6页
Water Saving Irrigation
基金
重庆市自然科学基金面上项目(cstc2021jcyj-msxmX0317)资助。
关键词
重金属污染土壤
含水量
生物炭
速效磷
速效钾
碱解氮
heavy metal polluted soil
biochar
available nutrients
available phosphorus
available potassium
alkali-hydro nitrogen
