氮素形态配比对添加玉米秸秆白浆土微生物学特性的影响

发布时间：2018-05-04 01:06

本文选题：氮素形态 + 白浆土　；参考：《河南农业科学》2017年06期

【摘要】：探讨了不同氮素形态配比(铵态氮∶硝态氮为4∶1、1∶1、1∶4)对添加玉米秸秆白浆土酶活性以及微生物生物量碳、氮含量的影响,以期筛选对于白浆土微生物学特性有优化作用的最佳氮素形态配比。结果表明,随培养时间增加,添加玉米秸秆的所有铵态氮与硝态氮配比处理白浆土的脲酶、碱性磷酸酶、蔗糖酶、蛋白酶和过氧化氢酶活性以及微生物生物量碳、氮含量均表现为先增加后降低的趋势。与培养初始时相比,培养结束时,除了过氧化氢酶活性有较大程度提高外,其余酶活性及微生物生物量碳、氮含量均不同程度地下降。与其他2个处理相比,铵硝等比例混合处理土壤脲酶、碱性磷酸酶、蔗糖酶和蛋白酶活性以及微生物生物量碳、氮含量的下降程度在一定程度上得到缓冲;同时,其对过氧化氢酶活性的促进作用更强。比较培养初始和培养结束时的结果可知,以硝态氮为主的处理对添加玉米秸秆白浆土的脲酶、蔗糖酶活性及微生物生物量氮含量有较强的抑制作用,而以铵态氮为主的处理则对碱性磷酸酶、蛋白酶、过氧化氢酶活性及微生物生物量碳含量有较强的抑制作用。
[Abstract]:The effects of different ratios of nitrogen forms (ammonium nitrogen: nitrate nitrogen: 4: 1: 1: 1: 4) on enzyme activity, microbial biomass carbon and nitrogen content in white soil of corn straw were studied. In order to select the best proportion of nitrogen forms which can optimize the microbiological characteristics of alpine soil. The results showed that the activities of urease, alkaline phosphatase, sucrase, protease and catalase, and microbial biomass carbon were treated with the ratio of ammonium nitrogen and nitrate nitrogen with the increase of culture time. Nitrogen content increased first and then decreased. At the end of culture, the activities of catalase and microbial biomass, carbon and nitrogen decreased to some extent, except for the increase of catalase activity at the end of culture. Compared with the other two treatments, the decrease of soil urease, alkaline phosphatase, sucrase and protease activity, microbial biomass carbon and nitrogen content were cushioned to some extent. It can promote the activity of catalase more strongly. Compared with the results at the beginning and end of culture, the results showed that the treatment with nitrate nitrogen had a strong inhibitory effect on urease, sucrase activity and microbial biomass nitrogen content in the white soil supplemented with corn straw. The treatment with ammonium nitrogen mainly inhibited alkaline phosphatase, protease, catalase activity and microbial biomass carbon content.
【作者单位】：吉林农业科技学院植物科学学院;中国农业大学农学院;
【基金】：吉林省教育厅“十二五”科学技术研究项目(吉教科合字[2015]第375号) 吉林农业科技学院博士启动基金(吉农院合字[2016]第B03号) 国家自然科学基金项目(41401251) 吉林农业科技学院重点学科培育项目(吉农院合字[2015]第X004号)
【分类号】：S141.4

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