Hydrodynamics and <sup>13</sup>C Isotopic Characteristics of Non-uniform Enrichment of Light and Heavy Fractions of Organic Carbon in Eroded Sediments on Sloping Land Subjected to Sheet Erosion

Qu Jiuqi; Liu Lin; Wang Shanqi

doi:10.13961/j.cnki.stbctb.20231023.001

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Hydrodynamics and ¹³C Isotopic Characteristics of Non-uniform Enrichment of Light and Heavy Fractions of Organic Carbon in Eroded Sediments on Sloping Land Subjected to Sheet Erosion

- Hydrodynamics and ¹³C Isotopic Characteristics of Non-uniform Enrichment of Light and Heavy Fractions of Organic Carbon in Eroded Sediments on Sloping Land Subjected to Sheet Erosion
- Bulletin of Soiland Water Conservation Vol. 44, Issue 1, Pages: 399-409(2024)
- 作者机构：
  
  山东师范大学地理与环境学院,山东,济南,250000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20231023.001
  CLC： S153.6
- Published：2024
- 稿件说明：
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Qu Jiuqi, Liu Lin, Wang Shanqi. Hydrodynamics and ¹³C Isotopic Characteristics of Non-uniform Enrichment of Light and Heavy Fractions of Organic Carbon in Eroded Sediments on Sloping Land Subjected to Sheet Erosion[J]. Bulletin of Soiland Water Conservation, 2024, 44(1): 399-409.
DOI：

Qu Jiuqi, Liu Lin, Wang Shanqi. Hydrodynamics and ¹³C Isotopic Characteristics of Non-uniform Enrichment of Light and Heavy Fractions of Organic Carbon in Eroded Sediments on Sloping Land Subjected to Sheet Erosion[J]. Bulletin of Soiland Water Conservation, 2024, 44(1): 399-409. DOI： 10.13961/j.cnki.stbctb.20231023.001.

摘要

[目的

]

探究片蚀泥沙轻组有机碳(LF

)和重组有机碳(HF

)不均匀富集的水动力学和碳同位素特征

为正确理解水蚀作用下土壤有机碳库变化提供理论与技术支撑。[方法

]

以陕西省咸阳市杨凌区土为研究对象

采用改进"三区"移动式变坡钢制土槽

结合人工模拟降雨技术

测定径流水动力学参数和泥沙各粒径团聚体有机碳组成及其δ

C值

并辅以棕壤侵蚀泥沙有机碳δ

C值和水力参数

验证土试验结果的准确性。[结果

]

①雨强和坡度较小时

侵蚀泥沙LF

和HF

易发生富集

且相较黏粉粒和微团聚体

大团聚体LF

与HF

含量受雨强和坡度的影响更大; ②侵蚀泥沙黏粉粒中有机碳δ

C值与其有机碳活跃分数(λ)呈负相关

而其他粒径团聚体有机碳δ

C值与其λ呈显著正相关(p

0.05); ③流速与黏粉粒λ显著正相关(p

0.05)

雷诺数与各粒径团聚体有机碳δ

C值均呈显著负相关(p

0.01)

片蚀过程中流速越大

黏粉粒中LF

越易于优先输移

而紊流加剧则促进低δ

C值团聚体有机碳的优先输移; ④对于侵蚀泥沙黏粉粒

流速和雷诺数越大

其有机碳δ

C值越小

λ越大;对于微团聚体和大团聚体

雷诺数越小

其有机碳δ

C值与λ越大。[结论

]

片蚀过程中轻重组有机碳流失与流速和雷诺数密切相关。并进一步验证了

C同位素对侵蚀泥沙有机碳示踪的有效性。

Abstract

[Objective] The hydraulic characteristics and 13C isotopic characteristics of the non-uniform enrichment of light (LFOC) and heavy (HFOC) fractions of soil organic carbon in sediments during the sheet erosion process were determined in order to provide theoretical and technical support for a better understanding of the dynamic changes in soil organic carbon stocks under water erosion.[Methods] This study was conducted on Lou soil from Yangling District of Xianyang City

Shannxi Province. An improved "three-zone" mobile steel soil pan was used together with an artificial rainfall simulator to measure runoff hydraulic parameters

organic carbon compositions of each aggregate size in sediments

and their related δ13C values. Additionally

these results for Lou soil were verified based on the δ13C values of organic carbon in eroded sediments and runoff hydraulic parameters for brown soil.[Results] ① When rainfall intensity and slope were low

both LFOC and HFOC were enriched in eroded sediments

and the organic carbon composition of macroaggregates were observed to be more susceptible to the influence of rainfall intensity and slope than observed for clay and silt particles and microaggregates. ② The δ13C values of organic carbon in clay and silt particles were negatively correlated with the percentage of LFOC in SOC (λ)

while the δ13C values of organic carbon in other size aggregates showed a significant positive correlation with λ values (p<0.05). ③ Flow velocity was positively correlated with λ values of clay and silt particles (p<0.05)

while Reynolds number was negatively correlated with δ13C values of clay and silt particles

microaggregates

and macroaggregates (p<0.01). Increasing flow velocity during sheet erosion promoted the preferential transport of clay and silt size organic carbon

while turbulence promoted the transport of organic carbon with low δ13C values in aggregates; ④ For clay and silt particles

the larger the flow velocity and Reynolds number

the smaller the δ13C value of organic carbon and the larger the λ were. For microaggregates and macroaggregates

the smaller of Reynolds number

the larger the δ13C values of organic carbon and λ values in microaggregates were.[Conclusion] The loss of LFOC and HFOC was closely related to flow velocity and Reynolds number during the sheet erosion process. The effectiveness of using the 13C isotope in tracing organic carbon in eroded sediments was verified.

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⁰

Hydrodynamics and 13C Isotopic Characteristics of Non-uniform Enrichment of Light and Heavy Fractions of Organic Carbon in Eroded Sediments on Sloping Land Subjected to Sheet Erosion

DOI：10.13961/j.cnki.stbctb.20231023.001

摘要

Abstract

关键词

Keywords

references

Hydrodynamics and ¹³C Isotopic Characteristics of Non-uniform Enrichment of Light and Heavy Fractions of Organic Carbon in Eroded Sediments on Sloping Land Subjected to Sheet Erosion