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    河套平原盐渍化地区非饱和带氮的分布特征及影响因素

    高爽 苏春利 谢先军 陶彦臻 曾邯斌 潘洪捷 闫福贵

    高爽, 苏春利, 谢先军, 陶彦臻, 曾邯斌, 潘洪捷, 闫福贵, 2022. 河套平原盐渍化地区非饱和带氮的分布特征及影响因素. 地球科学, 47(2): 568-576. doi: 10.3799/dqkx.2021.036
    引用本文: 高爽, 苏春利, 谢先军, 陶彦臻, 曾邯斌, 潘洪捷, 闫福贵, 2022. 河套平原盐渍化地区非饱和带氮的分布特征及影响因素. 地球科学, 47(2): 568-576. doi: 10.3799/dqkx.2021.036
    Gao Shuang, Su Chunli, Xie Xianjun, Tao Yanzhen, Zeng Hanbin, Pan Hongjie, Yan Fugui, 2022. Distribution Characteristics and Influencing Factors of Nitrogen in Unsaturated Zone in Salinized Area of Hetao Plain. Earth Science, 47(2): 568-576. doi: 10.3799/dqkx.2021.036
    Citation: Gao Shuang, Su Chunli, Xie Xianjun, Tao Yanzhen, Zeng Hanbin, Pan Hongjie, Yan Fugui, 2022. Distribution Characteristics and Influencing Factors of Nitrogen in Unsaturated Zone in Salinized Area of Hetao Plain. Earth Science, 47(2): 568-576. doi: 10.3799/dqkx.2021.036

    河套平原盐渍化地区非饱和带氮的分布特征及影响因素

    doi: 10.3799/dqkx.2021.036
    基金项目: 

    内蒙古自治区河套灌区盐碱地生物修复与综合开发研究 2019046338

    详细信息
      作者简介:

      高爽(1997-), 女, 硕士研究生, 主要从事水文地球化学与生态环境的研究.ORCID: 0000-0001-6808-5352.E-mail: 1073358995@qq.com

      通讯作者:

      苏春利, E-mail: chl.su@cug.edu.cn

    • 中图分类号: S153.6+1

    Distribution Characteristics and Influencing Factors of Nitrogen in Unsaturated Zone in Salinized Area of Hetao Plain

    • 摘要: 土壤氮在植物生长、土壤理化性质和微生物活动中扮演着重要的角色.为了识别盐渍化地区非饱和带氮的迁移过程,以河套灌区典型盐渍化耕地为例,通过非饱和带监测和水化学统计分析,探究了土壤剖面中氮素分布的差异性及主要影响因素.结果表明,研究区0~100 cm土层深度土壤氮含量处于较低水平,NO3-N、NH4-N和NO2-N含量平均值分别为4.88、1.63和0.04 mg/kg.土壤氮的空间分布与土层深度和理化性质有关,随深度增大,NO3-N含量呈逐渐增加的趋势,高值区主要分布于40~80 cm深度的土层,NH4-N含量多集中在60~100 cm深度的土层.土壤NO3-N含量主要与土壤pH、含水率和水溶性盐分含量(TDS、Cl-、SO42-、Na+)有关,而NH4-N含量主要受含水率、黏粒和TOC含量的影响.NO3-N和NH4-N在土壤中的积累与水盐运移、土壤矿物的静电吸附和微生物的控制有关,这在很大程度上受土壤粒度组成、pH、有机质含量和竞争性阴、阳离子含量的影响.

       

    • 图  1  研究区位置(a)、采样点布置图(b)及研究区全貌(c)

      Fig.  1.  Location (a), distribution of sampling points (b) and the photo of Field Test Site (c)

      图  2  土壤剖面NO3-N(a)和NH4-N(b)含量分布图以及NO3-N累积量分布图(c)

      Fig.  2.  Distribution of NO3-N(a) and NH4-N(b) contents and NO3-N cumulant(c) in soil profile

      图  3  各剖面土壤NO3-N、Cl-与含水率分布

      Fig.  3.  Soil NO3-N, Cl- and water content distribution in each profile

      图  4  非饱和带土壤NH4-N与TOC分布图

      Fig.  4.  NH4-N and TOC distribution in unsaturated soil

      图  5  土壤质地分类三角图(a)和土壤NH4-N与黏粒含量关系(b)

      Fig.  5.  Triangulation of soil texture classification(a) and relationship between NH4-N and clay content (b)

      图  6  非饱和带氮迁移转化概念模型

      Fig.  6.  Conceptual model of nitrogen transfer and transformation in unsaturated zone

      表  1  土壤氮素含量统计特征

      Table  1.   Statistical characteristics of soil nitrogen content

      最小值 最大值 平均值 标准差 变异系数(%)
      NO2-N(mg/kg) 0.03 0.06 0.04 0.006 5 15.28
      NH4-N(mg/kg) 0.33 14.36 1.63 2.970 0 181.92
      NO3-N(mg/kg) 0.45 18.46 4.88 4.750 0 97.34
      下载: 导出CSV

      表  2  土壤氮素与土壤黏粒含量以及孔隙水水化学的相关性

      Table  2.   Correlation of soil nitrogen with soil clay content and pore water hydrochemistry

      含水率 NO2-N NH4-N NO3-N pH EC 黏粒含量 HCO3- Cl- SO42- Na+ Mg2+ K+ Ca2+ TDS
      含水率 1
      NO2-N 0.358* 1
      NH4-N 0.318* -0.016 1
      NO3-N 0.506** 0.071 0.305 1
      pH -0.181 -0.029 -0.342* -0.360* 1
      EC 0.534** 0.224 0.342* 0.582** -0.640** 1
      黏粒含量 0.304 -0.032 0.826** 0.243 0.192 0.273 1
      HCO3- 0.495* 0.322 -0.029 0.274 0.255 0.067 0.652** 1
      Cl- 0.582** 0.312 0.449* 0.654** -0.367 0.935** 0.352 0.179 1
      SO42- 0.361 -0.008 0.857** 0.482* -0.706** 0.913** 0.186 -0.048 0.723** 1
      Na+ 0.627** 0.305 0.534* 0.650** -0.361 0.959** 0.364 0.256 0.972** 0.798** 1
      Mg2+ 0.098 -0.249 0.849** 0.340 -0.821** 0.761** -0.157 -0.287 0.512* 0.934** 0.567** 1
      K+ -0.447* -0.428 0.160 -0.100 -0.552* -0.171 -0.118 -0.196 -0.353 0.078 -0.342 0.314 1
      Ca2+ 0.115 -0.229 0.903** 0.322 -0.798** 0.692** -0.325 -0.251 0.421 0.911** 0.496* 0.979** 0.309 1 .
      TDS 0.501* 0.123 0.754** 0.597** -0.594** 0.985** 0.374 0.107 0.886** 0.956** 0.937** 0.813** -0.101 0.764** 1
      注:*. 在0.05水平(双侧)上显著相关; **. 在0.01水平(双侧)上显著相关.
      下载: 导出CSV
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    • 收稿日期:  2021-06-18
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