氮素形态对甘薯土壤微生物及酶活性的影响

发布时间：2019-03-31 09:22

【摘要】：研究氮素形态对土壤微生物特性的影响对于土壤管理具有重要意义。本试验在大田条件下,采用随机区组设计研究了硝态氮、铵态氮和酰胺态氮对甘薯地土壤微生物生物量碳、活跃微生物生物量、土壤呼吸及土壤酶活性的影响。结果表明,土壤微生物生物量碳、活跃微生物量、呼吸速率和土壤酶活性对不同氮素形态的响应不同。土壤微生物生物量碳在块根膨大前中期以铵态氮处理最大,而在收获期以硝态氮处理最大。土壤活跃微生物量以铵态氮处理最大。土壤呼吸速率、呼吸熵、脲酶和蔗糖酶活性均以酰胺态氮处理最大。甘薯施用铵态氮肥有利于提高土壤活跃微生物量和微生物生物量碳,适当增施铵态氮是保证土壤生物健康的较好施氮模式。
[Abstract]:It is of great significance for soil management to study the effects of nitrogen forms on soil microbial characteristics. The effects of nitrate, ammonium and amide nitrogen on soil microbial biomass carbon, active microbial biomass, soil respiration and soil enzyme activity in sweet potato fields were studied by random block design under field conditions. The results showed that the responses of soil microbial biomass, active microbial biomass, respiration rate and soil enzyme activity to different nitrogen forms were different. Soil microbial biomass carbon (microbial biomass) was the largest in the middle and middle stages of root tuber expansion and the largest in nitrate treatment during the harvest period, while the soil microbial biomass carbon was the largest in the middle stage of root tuber expansion. The soil active microbial biomass was the largest in ammonium nitrogen treatment. Soil respiration rate, respiration entropy, urease and sucrase activities were the highest in the treatment of amide nitrogen. Applying ammonium nitrogen fertilizer to sweet potato is beneficial to increase soil active microbial biomass and microbial biomass carbon. Proper application of ammonium nitrogen is a better nitrogen application mode to ensure soil biological health.
【作者单位】：江苏徐州甘薯研究中心江苏徐淮地区徐州农业科学研究所;
【基金】：江苏省六大高峰人才项目(NY-040) 国家青年基金项目(31401333) 作物生物学重点实验室开放课题基金(2013KF13) 农业部国家甘薯现代产业体系建设(CARS-11)
【分类号】：S154;S531

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