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红壤氮转化对土壤水分变化的响应

但小倩 陈招兄 程谊 蔡祖聪 张金波

但小倩, 陈招兄, 程谊, 蔡祖聪, 张金波. 红壤氮转化对土壤水分变化的响应[J]. 浙江农林大学学报. doi: 10.11833/j.issn.2095-0756.20200624
引用本文: 但小倩, 陈招兄, 程谊, 蔡祖聪, 张金波. 红壤氮转化对土壤水分变化的响应[J]. 浙江农林大学学报. doi: 10.11833/j.issn.2095-0756.20200624
DAN Xiaoqian, CHEN Zhaoxiong, CHENG Yi, CAI Zucong, ZHANG Jinbo. Response of nitrogen transformations to moisture changing in red soil[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20200624
Citation: DAN Xiaoqian, CHEN Zhaoxiong, CHENG Yi, CAI Zucong, ZHANG Jinbo. Response of nitrogen transformations to moisture changing in red soil[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20200624

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红壤氮转化对土壤水分变化的响应

doi: 10.11833/j.issn.2095-0756.20200624
基金项目: 国家自然科学基金重点项目资助(41830642)
详细信息
    作者简介: 但小倩(ORCID: 0000-0002-3447-3768),博士研究生,从事土壤氮素转化过程及其环境效应和植物对土壤氮转化过程的反馈作用研究。E-mail: 201301034@njnu.edu.cn
    通信作者: 张金波(ORCID: 0000-0002-5659-7921),教授,博士生导师,从事土壤氮转化过程及其环境效应和植物对土壤氮转化过程的反馈作用研究。E-mail: zhangjinbo@njnu.edu.cn
  • 中图分类号: S714.2

Response of nitrogen transformations to moisture changing in red soil

  • 摘要:   目的  土壤水分变化会影响微生物介导的氮转化。探明土壤氮初级转化速率,反映土壤内部氮素动态变化,探索氮转化对土壤水分变化的响应机制。  方法  采用15N成对标记技术,利用数值优化模型,量化不同水分条件(最大持水量的20%、60%、80%、100%)下,有机氮矿化、铵态氮(${{\rm{NH}}_4^{+}} $)微生物同化、自养硝化、异养硝化和硝态氮(${{\rm{NO}}_3^{-}} $)消耗等主要氮转化过程的初级转化速率。  结果  土壤不同氮转化过程对水分变化的响应不同。随土壤含水量上升(从最大持水量的20%升至100%),土壤中易分解有机氮库初级矿化速率(${M_{{\rm{N}}_{\rm{lab}}}} $)从1.757 mg·kg−1·d−1增加到2.598 mg·kg−1·d−1,难分解有机氮库初级矿化速率(${M_{{\rm{N}}_{\rm{rec}}}} $)变化不显著,总初级矿化速率(M,即${M_{{\rm{N}}_{\rm{lab}}} }$${M_{{\rm{N}}_{\rm{rec}}}} $)显著上升。初级自养硝化速率(${O_{{\rm{NH}}_4}} $)随土壤含水量增加而增加,在最大持水量为100%时达到最大值(0.266 mg·kg−1·d−1);初级异养硝化速率(${O_{{\rm{N}}_{\rm{rec}}}} $)随土壤含水量增加先上升后下降,在最大持水量为60%时达到最大值(0.115 mg·kg−1·d−1);土壤在最大持水量为80%和100%时${O_{{\rm{NH}}_4}} $显著大于${O_{{\rm{N}}_{\rm{rec}}} } $,总初级硝化速率(N,即${O_{{\rm{NH}}_{4}}} $${O_{{\rm{N}}_{\rm{rec}}} } $)随土壤含水量增加而增大。总初级${{\rm{NH}}_4^{+}} $微生物同化速率(${I_{{\rm{NH}}_{4}} } $)随土壤含水量增加线性上升,土壤在最大持水量的100 %时达到最大值(1.941 mg·kg−1·d−1);初级${{\rm{NO}}_3^{-}} $消耗速率(${C_{{\rm{NO}}_{3}}} $)在最大持水量的80%和100%时明显增加,总无机氮消耗速率(${I_{{\rm{NH}}_{4}}} $${C_{{\rm{NO}}_{3}}} $)随土壤含水量增加显著增大,并在最大持水量的80% 时超过总氮初级矿化速率。因此,随含水量增加土壤氮净矿化速率先上升到最大值,然后迅速下降为负值。  结论  红壤不同无机氮产生和消耗过程对水分变化的响应不同;适当增加土壤含水量可提高红壤氮素的可利用性。图5表1参48
  • 图  1  土壤氮素初级转化速率的15N示踪模型

    Figure  1  15N tracing model of gross soil N transformation rates

    图  2  不同水分土壤${\rm{NH}}_4^{+} $${\rm{NO}}_3^{-} $质量分数及15N丰度

    15${{\rm{NH}}_4^{+}} $表示添加15NH4NO3处理,15${{\rm{NO}}_3^{-}} $表示添加NH415NO3处理。线为拟合值

    Figure  2  Measured (spots) and model-fitted (lines) values of concentration and 15N abundance of the ${{\rm{NH}}_4^{+}}$ and ${{\rm{NO}}_3^{-}} $ under various moistures

    图  3  土壤氮素净转化速率与土壤含水量的关系

    线为拟合值

    Figure  3  Relationships between soil net transformation rates and moistures

    图  4  土壤氮素初级转化速率与土壤含水量的关系

    线为拟合值

    Figure  4  Relationships between gross of soil transformation rates and moistures

    图  5  不同土壤含水量下土壤$I_{{\rm{NH}}_{4}{\_{{\rm{N}}_{\rm{rec}}}}} $$I_{{\rm{NH}}_{4}{\_{{\rm{N}}_{\rm{lab}}}}} $$I_{{\rm{NH}}_4} $的贡献率

    Figure  5  Contribution ratio of $I_{{\rm{NH}}_{4}{\_{{\rm{N}}_{\rm{rec}}}}} $ and $I_{{\rm{NH}}_{4}{\_{{\rm{N}}_{\rm{lab}}}}} $ to $I_{{\rm{NH}}_4} $ under various moistures

    表  1  土壤氮转化速率(y)随土壤含水量(x)变化的拟合方程

    Table  1.   Fitting curve equations of soil N tansformation rates with changing moistures

    参数方程参数方程
    My=1.547 5exp(0.005 1x),R2=0.922 0,P<0.05${O_{{\rm{N}}_{\rm{rec}}}} $y=−0.083 0+0.005 7x−(4.630 7E−5)x2R2=0.755 2,P<0.05
    ${M_{{\rm{N}}_{\rm{lab}}}} $y=1.483 2exp(0.005 5x),R2=0.885 0,P<0.05${O_{{\rm{NH}}_4}} $y=−0.014 4+(1.059 6E−5)x2.229 3R2=0.821 1,P<0.05
    ${M_{{\rm{N}}_{\rm{rec}}} }$/${C_{{\rm{NO}}_3}} $y=0.966 4−0.020 8x+0.000 2x2R2=0.954 5,P<0.05
    ${I_{{\rm{NH}}_4}} $y=0.009 2+0.018 4xR2=0.658 2,P<0.05MNy=−0.880 8+0.068 5x−0.000 7x2R2=0.684 7,P<0.05
    Ny=−0.062 9+0.003 8xR2=0.930 4,P<0.05NNy=−1.204 0+0.028 8x−0.000 2x2R2=0.994 3,P<0.05
      说明:/表示没有数值
    下载: 导出CSV
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  • 收稿日期:  2020-09-30
  • 修回日期:  2021-01-22

红壤氮转化对土壤水分变化的响应

doi: 10.11833/j.issn.2095-0756.20200624
    基金项目:  国家自然科学基金重点项目资助(41830642)
    作者简介:

    但小倩(ORCID: 0000-0002-3447-3768),博士研究生,从事土壤氮素转化过程及其环境效应和植物对土壤氮转化过程的反馈作用研究。E-mail: 201301034@njnu.edu.cn

    通信作者: 张金波(ORCID: 0000-0002-5659-7921),教授,博士生导师,从事土壤氮转化过程及其环境效应和植物对土壤氮转化过程的反馈作用研究。E-mail: zhangjinbo@njnu.edu.cn
  • 中图分类号: S714.2

摘要:   目的  土壤水分变化会影响微生物介导的氮转化。探明土壤氮初级转化速率,反映土壤内部氮素动态变化,探索氮转化对土壤水分变化的响应机制。  方法  采用15N成对标记技术,利用数值优化模型,量化不同水分条件(最大持水量的20%、60%、80%、100%)下,有机氮矿化、铵态氮(${{\rm{NH}}_4^{+}} $)微生物同化、自养硝化、异养硝化和硝态氮(${{\rm{NO}}_3^{-}} $)消耗等主要氮转化过程的初级转化速率。  结果  土壤不同氮转化过程对水分变化的响应不同。随土壤含水量上升(从最大持水量的20%升至100%),土壤中易分解有机氮库初级矿化速率(${M_{{\rm{N}}_{\rm{lab}}}} $)从1.757 mg·kg−1·d−1增加到2.598 mg·kg−1·d−1,难分解有机氮库初级矿化速率(${M_{{\rm{N}}_{\rm{rec}}}} $)变化不显著,总初级矿化速率(M,即${M_{{\rm{N}}_{\rm{lab}}} }$${M_{{\rm{N}}_{\rm{rec}}}} $)显著上升。初级自养硝化速率(${O_{{\rm{NH}}_4}} $)随土壤含水量增加而增加,在最大持水量为100%时达到最大值(0.266 mg·kg−1·d−1);初级异养硝化速率(${O_{{\rm{N}}_{\rm{rec}}}} $)随土壤含水量增加先上升后下降,在最大持水量为60%时达到最大值(0.115 mg·kg−1·d−1);土壤在最大持水量为80%和100%时${O_{{\rm{NH}}_4}} $显著大于${O_{{\rm{N}}_{\rm{rec}}} } $,总初级硝化速率(N,即${O_{{\rm{NH}}_{4}}} $${O_{{\rm{N}}_{\rm{rec}}} } $)随土壤含水量增加而增大。总初级${{\rm{NH}}_4^{+}} $微生物同化速率(${I_{{\rm{NH}}_{4}} } $)随土壤含水量增加线性上升,土壤在最大持水量的100 %时达到最大值(1.941 mg·kg−1·d−1);初级${{\rm{NO}}_3^{-}} $消耗速率(${C_{{\rm{NO}}_{3}}} $)在最大持水量的80%和100%时明显增加,总无机氮消耗速率(${I_{{\rm{NH}}_{4}}} $${C_{{\rm{NO}}_{3}}} $)随土壤含水量增加显著增大,并在最大持水量的80% 时超过总氮初级矿化速率。因此,随含水量增加土壤氮净矿化速率先上升到最大值,然后迅速下降为负值。  结论  红壤不同无机氮产生和消耗过程对水分变化的响应不同;适当增加土壤含水量可提高红壤氮素的可利用性。图5表1参48

English Abstract

但小倩, 陈招兄, 程谊, 蔡祖聪, 张金波. 红壤氮转化对土壤水分变化的响应[J]. 浙江农林大学学报. doi: 10.11833/j.issn.2095-0756.20200624
引用本文: 但小倩, 陈招兄, 程谊, 蔡祖聪, 张金波. 红壤氮转化对土壤水分变化的响应[J]. 浙江农林大学学报. doi: 10.11833/j.issn.2095-0756.20200624
DAN Xiaoqian, CHEN Zhaoxiong, CHENG Yi, CAI Zucong, ZHANG Jinbo. Response of nitrogen transformations to moisture changing in red soil[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20200624
Citation: DAN Xiaoqian, CHEN Zhaoxiong, CHENG Yi, CAI Zucong, ZHANG Jinbo. Response of nitrogen transformations to moisture changing in red soil[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20200624

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