减施化肥下紫云英翻压量对土壤团聚体及铁锰氧化物的影响
作者:
作者单位:

(1.华中农业大学,农业农村部长江中下游耕地保育重点实验室,湖北 武汉 430070;2.湖南省土壤肥料研究所,农业农村部湖南耕地保育科学观测实验站,湖南 长沙 410125)

作者简介:

徐永昊(1995-),男,山东青岛市人,硕士研究生,主要从事土壤化学方面的研究。E-mail:1257666407@qq.com。通讯作者:黄丽,E-mail:daisyh@mail.hzau.edu.cn。

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基金项目:

基金项目:国家绿肥产业技术体系(CARS-22);国家自然科学基金(41977020)。


Effects of different returning amount of Chinese milk vetch on soil aggregates and iron and manganese oxides under reduced fertilizer application
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(1.Key Laboratory of Arable LandConservation(Middle and Lower Reaches of Yangtze River),Ministry of Agriculture and Rural Affairs,HuazhongAgricultural University,Wuhan Hubei430070;2.Scientific Observing and Experimental Station of Arable LandConservation(Hunan),Ministry of Agriculture and Rural Affairs,Soil and Fertilizer Institute of Hunan Province,Changsha Hunan410125)

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    摘要:

    以湖南省南县长期紫云英 -双季稻轮作的土壤为对象,在化肥减量 20%和 40%,紫云英翻压量 15、22.5、30、37.5 t·hm -24个水平下,研究减量化肥与翻压不同量紫云英的土壤团聚体中铁锰氧化物的变化及与团聚体水稳性的关系。结果表明:(1)与对照[紫云英翻压(MV)和施用 100%化肥(F)处理]相比,减施 20%和 40%化肥配施紫云英增加了 >0.25 mm团聚体的含量,降低了 <0.25 mm团聚体的含量;减施化肥下紫云英翻压量在 15和 22.5 t·hm -2时团聚体稳定性提高 8.91%~ 45.45%。(2)与对照相比,减施化肥 20%紫云英翻压量为15~ 30 t·hm -2时,土壤团聚体的游离铁锰含量随着翻压量的增加呈现下降的趋势,但非晶质、络合铁锰含量分别显著提高 7.70%~ 72.31%和 10.75%~ 58.53%。(3)相关性与通径分析显示,化肥减施与紫云英翻压下土壤团聚体稳定性主要取决于铁氧化物的含量;而在铁氧化物中,非晶质与络合态铁对团聚体稳定性的提高起直接作用。

    Abstract:

    The soils of long-term Chinese milk vetch-double cropping rice rotation in NanxianCounty,Hunan Province weretaken as the researchobject.When the fertilizer reduction was 20% and40%,and the return amount of Chinese milk vetchwas set at15,22.5,30,37. 5 t·hm -2,the effects of both reduced fertilizer and different returning amount of Chinese milk vetch on iron-manganese oxides in soil aggregates and their relationships with water stability of aggregates werestudied.The results showedthat:(1)Compared with thecontrol[alone returning of Chinese milkvetch(MV)and application of100% fertilizer(F)],reducing the application of 20% and 40% of the chemical fertilizers combined with the applicationof Chinese milk vetch increased the content of >0.25 mm aggregates,reduced the content of <0.25 mm aggregates;thestability of aggregates increased by 8.91%~ 45.45% at 15 and 22.5 t·hm -2 Chinese milk vetch returning when reduced theapplication of chemicalfertilizers.(2)Compared with thecontrol,when the fertilizer was reduced by20%,the free ironand manganese content in the soil aggregates decreased with the increase of returning amount of Chinese milk vetch(15~ 30 t·hm-2).But the content of crystalline and complex iron and manganese significantly increased by 7.70%~ 72.31%and 10.75%~58.53%,respectively.(3)Correlation and path analysis showed that the stability of soil aggregates underchemical fertilizer reduction and Chinese milk vetch returning mainly depended on the iron oxide contents.While in iroNOxides,amorphous and complex irons played a direct role in improving the stability of aggregates.

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徐永昊,聂军,鲁艳红,耿明建,黄丽.减施化肥下紫云英翻压量对土壤团聚体及铁锰氧化物的影响[J].中国土壤与肥料,2020,(6):9-18.

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  • 收稿日期:2019-10-19
  • 最后修改日期:
  • 录用日期:2019-12-27
  • 在线发布日期: 2021-01-21