摘要
采用室内恒温通气培养法,以北京大棚蔬菜地土壤为对象,研究熏蒸剂氯化苦(Pic)、碘甲烷(MeI)、1,3-二氯丙烯(1,3-D)和二甲基二硫(DMDS)对土壤氮素矿化和硝化的影响。结果表明,4种熏蒸剂处理后短期内均能显著增加土壤中氮累积矿化量,在处理后第0d,1,3-D、MeI、DMDS、Pic处理的氮累积矿化量分别为320.62mg·kg-1、317.25mg·kg-1、287.87mg·kg-1、278.73mg·kg-1,较对照(189.89mg·kg-1)分别增加68.85%、67.07%、51.60%、46.78%。4种熏蒸剂处理后土壤硝化作用过程受到显著抑制,在药剂熏蒸处理第0d,各熏蒸处理土壤中铵态氮含量均高于对照组,其中MeI处理组铵态氮含量最高,为194.97mg·kg-1,对照组铵态氮含量最低,为28.82mg·kg-1。Pic、1,3-D、DMDS、MeI处理后第0d硝化抑制率分别为40.8%、20.8%、26.9%、24.1%。Pic、1,3-D、MeI对硝化作用的抑制至少维持两周,DMDS的抑制作用至少维持1周。在后期培养过程中,各处理矿化作用和硝化作用都逐渐恢复至对照水平。
With laboratory incubation method at constant temperature under aerated conditions,the effects of 4 fumigants [Chloropicrin （Pic）,methyl iodide （MeI）,1,3-dichloropropene （1,3-D） and methyl disulfide （DMDS） on soil N mineralization and nitrification under vegetable greenhouse conditions in Beijing area were studied.The results reveal that mineral N concentration increases significantly in a short-term period after fumigant treatment.Cumulative N mineralization under 1,3-D,MeI,DMDS and Pic treatments are 320.62 mg·kg^-1317.25 mg·kg^-1287.87 mg·kg^-1and 278.73 mg·kg^-1respectively.This represents corresponding increases of 68.85%,67.07%,51.60% and 46.78% compared with untreated soils （189.89 mg·kg^-1.Fumigation strongly inhibits nitrification.Compared with the control,ammonium nitrogen content increases after fumigation.MeI treatment has the highest ammonium nitrogen （194.97 mg·kg^-1 and control treatment has the lowest （28.82 mg·kg^-1.Nitrification inhibition rates by Pic,1,3-D,DMDS,MeI treatments are 40.8%,20.8%,26.9% and 24.1% respectively.Nitrification is inhibited for at least 2 weeks after treatment with Pic,1,3-D and MeI,and at least for 1 week after treatment with DMDS.Nitrification and mineralization gradually recover under long-term incubation.
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2010年第5期934-938,共5页
Chinese Journal of Eco-Agriculture
基金
国家自然科学基金项目(40871131)
现代农业产业技术体系北京市创新团队基金资助
关键词
熏蒸剂
氯化苦
碘甲烷
1
3-二氯丙烯
二甲基二硫
氮素转化
硝化作用
矿化作用
Fumigant
Chloropicrin
Methyl iodide
1
3-Dichloropropene
Methyl disulfide
Nitrogen transformation
Nitrification
Mineralization
