Soil Particle Settlement Sorting and Distribution Characteristics of Carbon, Nitrogen and Salt During Gradual Thawing
[Objective] The classification of sediment particles and the accompanying distribution characteristics of carbon, nitrogen and salt in the process of soil thawing layer by layer under snowmelt runoff scenario were analyzed in order to identify the mechanism of soil freeze-thaw erosion and the induce...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Science Press
2023-10-01
|
| Series: | Shuitu baochi tongbao |
| Subjects: | |
| Online Access: | http://stbctb.alljournal.com.cn/stbctben/article/abstract/20230505 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850191642837909504 |
|---|---|
| author | Yuan Xinhao Wang Xinyao Li Fan Wang Ruiqi Hu Yaxian Li Xianwen |
| author_facet | Yuan Xinhao Wang Xinyao Li Fan Wang Ruiqi Hu Yaxian Li Xianwen |
| author_sort | Yuan Xinhao |
| collection | DOAJ |
| description | [Objective] The classification of sediment particles and the accompanying distribution characteristics of carbon, nitrogen and salt in the process of soil thawing layer by layer under snowmelt runoff scenario were analyzed in order to identify the mechanism of soil freeze-thaw erosion and the induced micro-environmental effects on eroding slopes. [Methods] Soil samples were obtained from an eroding slope in the mollisol region of Northeastern China. Air-dried soil was used to fill columns that were subjected to three treatments: non-freeze-thaw, full freeze-full thaw, and gradual progressive thawing after freezing. The soil columns were completely immersed in a water bath so that thawing occurred from outside to inside. All soil samples were then fractionated by settling velocity, and the electrical conductivity (EC), pH value, soil organic carbon (SOC), and total nitrogen (TN) of each particle size were determined and analyzed. [Results] ① The freeze-thaw process reduced the proportion of the soil particles >500 μm and ≤125 μm, but increased the proportion of soil particles between 125 μm and 500 μm. Larger particles had higher EC, but lower SOC and TN. ② Across gradual progressively thawed layers, the outer layer (thawed earlier) had fewer particles ≤63 μm, and the inner layer (thawed later) had more particles between 125 μm and 500 μm. More specifically, EC, SOC, and TN were higher in the larger fractions from the outer layer. ③ Compared with the original soil, 64.8% of the dissolved solids were lost from the soil that experienced gradual progressive thawing, but the loss rate of SOC and TN was only 4.08% and 2.72%, respectively. The loss of dissolved solids and organic matter was greater from the inner layer than from the outer layer. [Conclusion] After freezing and thawing, the degree of fragmentation of the outer layer of soil was large, and the soil particles on the slope tended to become homogenized. Organic matter content varied significantly between particle size classes, and its distribution was more stable in small-grained soils. Salts and organic matter migrated from the inner layer of the soil to the outer layer during the freeze-thaw process, resulting in loss. |
| format | Article |
| id | doaj-art-e6ad1fe65aaf40eeae7d7a60974d853f |
| institution | OA Journals |
| issn | 1000-288X |
| language | zho |
| publishDate | 2023-10-01 |
| publisher | Science Press |
| record_format | Article |
| series | Shuitu baochi tongbao |
| spelling | doaj-art-e6ad1fe65aaf40eeae7d7a60974d853f2025-08-20T02:14:51ZzhoScience PressShuitu baochi tongbao1000-288X2023-10-01435354410.13961/j.cnki.stbctb.2023.05.0051000-288X(2023)05-0035-10Soil Particle Settlement Sorting and Distribution Characteristics of Carbon, Nitrogen and Salt During Gradual ThawingYuan Xinhao0Wang Xinyao1Li Fan2Wang Ruiqi3Hu Yaxian4Li Xianwen5College of Water Resources and Architectural Engineering, Northwest A&F University, Institute of Water-saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, ChinaCollege of Water Resources and Architectural Engineering, Northwest A&F University, Institute of Water-saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, ChinaCollege of Water Resources and Architectural Engineering, Northwest A&F University, Institute of Water-saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, ChinaCollege of Water Resources and Architectural Engineering, Northwest A&F University, Institute of Water-saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, ChinaInstitute of Soil and Water Conservation, Northwest A&F University, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling, Shaanxi 712100, ChinaCollege of Water Resources and Architectural Engineering, Northwest A&F University, Institute of Water-saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China[Objective] The classification of sediment particles and the accompanying distribution characteristics of carbon, nitrogen and salt in the process of soil thawing layer by layer under snowmelt runoff scenario were analyzed in order to identify the mechanism of soil freeze-thaw erosion and the induced micro-environmental effects on eroding slopes. [Methods] Soil samples were obtained from an eroding slope in the mollisol region of Northeastern China. Air-dried soil was used to fill columns that were subjected to three treatments: non-freeze-thaw, full freeze-full thaw, and gradual progressive thawing after freezing. The soil columns were completely immersed in a water bath so that thawing occurred from outside to inside. All soil samples were then fractionated by settling velocity, and the electrical conductivity (EC), pH value, soil organic carbon (SOC), and total nitrogen (TN) of each particle size were determined and analyzed. [Results] ① The freeze-thaw process reduced the proportion of the soil particles >500 μm and ≤125 μm, but increased the proportion of soil particles between 125 μm and 500 μm. Larger particles had higher EC, but lower SOC and TN. ② Across gradual progressively thawed layers, the outer layer (thawed earlier) had fewer particles ≤63 μm, and the inner layer (thawed later) had more particles between 125 μm and 500 μm. More specifically, EC, SOC, and TN were higher in the larger fractions from the outer layer. ③ Compared with the original soil, 64.8% of the dissolved solids were lost from the soil that experienced gradual progressive thawing, but the loss rate of SOC and TN was only 4.08% and 2.72%, respectively. The loss of dissolved solids and organic matter was greater from the inner layer than from the outer layer. [Conclusion] After freezing and thawing, the degree of fragmentation of the outer layer of soil was large, and the soil particles on the slope tended to become homogenized. Organic matter content varied significantly between particle size classes, and its distribution was more stable in small-grained soils. Salts and organic matter migrated from the inner layer of the soil to the outer layer during the freeze-thaw process, resulting in loss.http://stbctb.alljournal.com.cn/stbctben/article/abstract/20230505freeze-thawparticle sizesettling velocityprogressive thawingsalinitycarbon and nitrogen |
| spellingShingle | Yuan Xinhao Wang Xinyao Li Fan Wang Ruiqi Hu Yaxian Li Xianwen Soil Particle Settlement Sorting and Distribution Characteristics of Carbon, Nitrogen and Salt During Gradual Thawing Shuitu baochi tongbao freeze-thaw particle size settling velocity progressive thawing salinity carbon and nitrogen |
| title | Soil Particle Settlement Sorting and Distribution Characteristics of Carbon, Nitrogen and Salt During Gradual Thawing |
| title_full | Soil Particle Settlement Sorting and Distribution Characteristics of Carbon, Nitrogen and Salt During Gradual Thawing |
| title_fullStr | Soil Particle Settlement Sorting and Distribution Characteristics of Carbon, Nitrogen and Salt During Gradual Thawing |
| title_full_unstemmed | Soil Particle Settlement Sorting and Distribution Characteristics of Carbon, Nitrogen and Salt During Gradual Thawing |
| title_short | Soil Particle Settlement Sorting and Distribution Characteristics of Carbon, Nitrogen and Salt During Gradual Thawing |
| title_sort | soil particle settlement sorting and distribution characteristics of carbon nitrogen and salt during gradual thawing |
| topic | freeze-thaw particle size settling velocity progressive thawing salinity carbon and nitrogen |
| url | http://stbctb.alljournal.com.cn/stbctben/article/abstract/20230505 |
| work_keys_str_mv | AT yuanxinhao soilparticlesettlementsortinganddistributioncharacteristicsofcarbonnitrogenandsaltduringgradualthawing AT wangxinyao soilparticlesettlementsortinganddistributioncharacteristicsofcarbonnitrogenandsaltduringgradualthawing AT lifan soilparticlesettlementsortinganddistributioncharacteristicsofcarbonnitrogenandsaltduringgradualthawing AT wangruiqi soilparticlesettlementsortinganddistributioncharacteristicsofcarbonnitrogenandsaltduringgradualthawing AT huyaxian soilparticlesettlementsortinganddistributioncharacteristicsofcarbonnitrogenandsaltduringgradualthawing AT lixianwen soilparticlesettlementsortinganddistributioncharacteristicsofcarbonnitrogenandsaltduringgradualthawing |