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

doi:10.3799/dqkx.2021.036

Volume 47 Issue 2

Feb. 2022

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Article Navigation > Earth Science > 2022 > 47(2): 568-576

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

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

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

doi: 10.3799/dqkx.2021.036

1.
School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
2.
Geological Survey Institute of Inner Mongolia Autonomous Region, Huhhot 011020, China

Received Date: 2021-06-18
Publish Date: 2022-02-25

Abstract

Abstract

Soil nitrogen plays an important role in plant growth, soil physicochemical properties and microbial activities. In order to identify the process and mechanism of nitrogen migration in the unsaturated zone in salinized areas, a typical salinized farmland in Hetao irrigation areawas selected to explore the difference of nitrogen distribution in soil profiles and the main influencing factors through monitoring the unsaturated zone and hydrochemical statistical analysis. The results showed that the soil nitrogen content in the 0-100 cm depth of the study area was at a low level, and the average contents of NO₃-N, NH₄-N and NO₂-N were 4.88, 1.63 and 0.04 mg/kg, respectively. The spatial distribution of soil nitrogen is related to soil depth and physical and chemical properties. With the increase of soil depth, NO₃-N content showed a trend of gradual increase. The high value area is mainly distributed in the soil layer with a depth of 40-80 cm, and the content of NH₄-N mostly concentrates in the soil layer with a depth of 60-100 cm. Soil NO₃-N content is mainly related to soil pH, water content and water-soluble salt content (TDS, Cl^-, SO₄^2-、Na⁺), while NH₄-N content is mainly affected by water content, clay particles and TOC content. The accumulation of NO₃-N and NH₄-N in soil is related to the movement of water and salt, the electrostatic adsorption of soil minerals and the control of microorganisms, which are largely affected by soil particle size composition, pH, organic matter content and competitive anionsand cations content.
- unsaturated zone,
- nitrogen,
- salinization,
- TOC,
- soilgranularity,
- environmental geology

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References(35)

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

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