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不同退耕还草方式下宁夏南部山区土壤氮素转化速率与微生物变化的耦合关系

牛 丹 黄懿梅 倪银霞 赵 彤 蒋跃利 闫 浩

牛 丹, 黄懿梅, 倪银霞, 赵 彤, 蒋跃利, 闫 浩. 不同退耕还草方式下宁夏南部山区土壤氮素转化速率与微生物变化的耦合关系[J]. 环境科学研究, 2015, 28(10): 1586-1595.
引用本文: 牛 丹, 黄懿梅, 倪银霞, 赵 彤, 蒋跃利, 闫 浩. 不同退耕还草方式下宁夏南部山区土壤氮素转化速率与微生物变化的耦合关系[J]. 环境科学研究, 2015, 28(10): 1586-1595.
NIU Dan, HUANG Yimei, NI Yinxia, ZHAO Tong, JIANG Yueli, YAN Hao. Coupling Relations of Nitrogen Transformation Rate and Microbial Changes During Soil Mineralization Under Different Methods of Returning Farmland and Grassland in the Mountainous Area of Southern Ningxia, Northwest China[J]. Research of Environmental Sciences, 2015, 28(10): 1586-1595.
Citation: NIU Dan, HUANG Yimei, NI Yinxia, ZHAO Tong, JIANG Yueli, YAN Hao. Coupling Relations of Nitrogen Transformation Rate and Microbial Changes During Soil Mineralization Under Different Methods of Returning Farmland and Grassland in the Mountainous Area of Southern Ningxia, Northwest China[J]. Research of Environmental Sciences, 2015, 28(10): 1586-1595.

不同退耕还草方式下宁夏南部山区土壤氮素转化速率与微生物变化的耦合关系

基金项目: 国家自然科学基金项目(41101254);中央高校基本科研业务费专项(QN2011020)

Coupling Relations of Nitrogen Transformation Rate and Microbial Changes During Soil Mineralization Under Different Methods of Returning Farmland and Grassland in the Mountainous Area of Southern Ningxia, Northwest China

  • 摘要: 为了明确不同退耕还草方式下土壤养分转化的机理及其影响因素,以宁夏南部山区(下称宁南山区)天然草地、人工草地和撂荒地土壤为研究对象,运用PVC顶盖埋管法对3种类型草地土壤中氮素的净转化速率、微生物区系和氮素微生物生理群进行了研究,探讨土壤氮素净转化速率与微生物的关系. 结果表明:①在培养过程中,3种草地类型土壤中细菌、放线菌和真菌数量平均值分别为9.6×105、3.8×104和4.0×101 CFU/g(以干土计),氮素微生物生理群数量表现为氨化细菌(4.5×104 CFU/g)>自生固氮菌(4.3×103 CFU/g)>硝化细菌(6.5×102 CFU/g)>反硝化细菌(3.9×102 CFU/g)>亚硝化细菌(1.7×102 CFU/g),其中,人工草地土壤中微生物数量最高;②细菌、真菌、反硝化细菌与亚硝化细菌数量的峰值均出现在培养第120天,放线菌和自生固氮菌数量的峰值均出现在第240天,硝化细菌数量的峰值出现在第60天,而氨化细菌数量在各类型草地土壤中出现峰值的时间不统一;③各类型草地土壤氮素的净矿化速率、净氨化速率、净硝化速率均在61~120 d内最低,净矿化速率与净硝化速率在181~240 d内最高,净氨化速率在241~360 d内最高,微生物固氮速率的峰值出现在121~180 d,最低值出现在241~360 d. 在该区土壤氮素转化速率与微生物数量紧密相关,土壤温度、土壤水分通过影响微生物数量而成为影响土壤氮素矿化的主要因素;土壤氮素的生物固持过程比有机氮矿化过程更为活跃;种植苜蓿的人工草地比天然草地和撂荒地更有利于微生物的繁殖与土壤氮素的矿化.

     

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  • 收稿日期:  2015-04-02
  • 修回日期:  2015-07-20
  • 刊出日期:  2015-10-25

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