河南农业科学 ›› 2022, Vol. 51 ›› Issue (12): 63-72.DOI: 10.15933/j.cnki.1004-3268.2022.12.008

• 农业资源与环境 • 上一篇    下一篇

秸秆深埋配施氮肥对黑土有机碳组分及养分的影响

许思思1,吕雪梅1,周萌1,2,隋跃宇1,2,焦晓光1,2   

  1. (1.黑龙江大学现代农业与生态环境学院,黑龙 江哈尔滨 150080;2.中国科学院东北地理与农业生态研究所/黑土区农业生态重点实验室,黑龙江 哈尔滨 150081)
  • 收稿日期:2022-09-05 出版日期:2022-12-15 发布日期:2023-01-17
  • 通讯作者: 焦晓光(1976-),女,黑龙江哈尔滨人,教授,博士,主要从事土壤生态与植物营养研究。E-mail:2004086@hlju.edu.cn
  • 作者简介:许思思(1997-),女,江西宜春人,在读硕士研究生,研究方向:植物资源利用。E-mail:1739349835@qq.com
  • 基金资助:
    国家自然科学基金项目(42077081)

Effects of Straw Deep Burial Combined with Nitrogen Fertilizer on Organic Carbon Components and Nutrients in Black Soils

XU Sisi1,LÜ Xuemei1,ZHOU Meng1,2,SUI Yueyu1,2,JIAO Xiaoguang1,2   

  1. (1.College of Modern Agriculture and Ecological Environment,Heilongjiang University,Harbin 150080,China;2.Northeast Institute of Geography and Agroecology/Key Laboratory of Mollisols Agroecology,Chinese Academy of Sciences,Harbin 150081,China)
  • Received:2022-09-05 Published:2022-12-15 Online:2023-01-17

摘要: 为探究秸秆深埋配施氮肥对土壤有机碳组分及养分的影响,以东北黑土为研究对象,于2015—2020 年在玉米田秸秆深埋和无秸秆深埋条件下设置4 个氮肥(纯N)水平(无氮:0 kg/hm2;低氮:135kg/hm2;中氮:180 kg/hm2;高氮:225 kg/hm2),系统分析土壤养分和有机碳组分含量变化规律。结果表明,秸秆深埋对土壤全氮(TN)、全磷(TP)、全钾(TK)含量影响不显著(P>0.05);显著提高土壤总有机碳(SOC)、轻组有机碳(LFOC)和可溶性有机碳(DOC)含量(P<0.05),其增幅分别为2.45%~10.96%、8.76%~70.50%、47.53%~64.21%;对土壤易氧化有机碳(ROC)和颗粒有机碳(POC)均无显著影响(P>0.05)。秸秆深埋条件下,施氮对土壤DOC、POC含量影响不显著(P>0.05),但会显著提高SOC的含量(P<0.05),增幅为5.56%~11.96%;显著降低LFOC、ROC和TP的含量(P<0.05),降幅分别为19.71%~31.10%、4.75%~8.75%、3.14%~6.40%。秸秆深埋配施中氮时,土壤SOC和DOC含量最高;秸秆深埋不施氮时,土壤LFOC和ROC含量最高;秸秆深埋配施高氮时,土壤TN含量最高。秸秆深埋会增大SOC与DOC的相关性,减小SOC与其他有机碳组分及TN、TP、TK的相关性。综合考虑,秸秆深埋配施纯N 180 kg/hm2更有利于整体提高土壤肥力。

关键词: 秸秆深埋, 施氮水平, 黑土, 有机碳组分, 土壤养分

Abstract: With farmland black soils in Northeast China as the research object,the effects of straw deep burial and nitrogen fertilizer on soil organic carbon components and nutrients were investigated.Four nitrogen fertilizer(pure N)levels(no nitrogen:0 kg/ha;low nitrogen:135 kg/ha;medium nitrogen:180 kg/ha;high nitrogen:225 kg/ha) were set up for treatments(no straw and straw deep burial).The changes of soil nutrients and organic carbon components were systematically analyzed.The results showed that the contents of total nitrogen(TN),total phosphorus(TP)and total potassium(TK)in soil were not significantly affected by straw deep burial(P>0.05).The contents of soil organic carbon(SOC),light group organic carbon(LFOC) and soluble organic carbon(DOC) were significantly increased(P<0.05)by 2.45%—10.96%,8.76%—70.50% and 47.53%—64.21%,respectively.There were no significant effects on soil easily oxidized organic carbon(ROC)and particulate organic carbon(POC)(P>0.05).Under the condition of straw deep burial,nitrogen application had no significant effect on soil DOC and POC(P>0.05).However,it significantly increased the SOC content by 5.56%—11.96%(P<0.05).The contents of LFOC,ROC and TP were significantly reduced by 19.71%—31.10%,4.75%—8.75% and 3.14%—6.40% respectively(P<0.05).The SOC and DOC contents were the highest under straw deep burial with medium nitrogen.The contents of LFOC and ROC in soil were the highest under straw deep burial with no nitrogen. The soil TN content was the highest under straw deep burial with high nitrogen. Furthermore,straw deep burial increased the correlation between SOC and DOC,and reduced the correlation between SOC and other organic carbon components,TN,TP and TK.By overall consideration,straw deep burial with 180 kg/ha of pure N is more conducive to the improvement of soil fertility.

Key words: Straw deep burial, Nitrogen application level, Black Soil, Organic carbon components, Soil nutrient

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