Effects of Different Crust Types on Soil Aggregates and Organic Carbon of Vegetated Concrete Substrates

Yan Shuxing; Xia Dong; Ai Shangjin; Ma Jiaxin; Liu Fang; Liu Liming; Lin Maofeng

doi:10.13961/j.cnki.stbctb.20230216.001

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Effects of Different Crust Types on Soil Aggregates and Organic Carbon of Vegetated Concrete Substrates

- Effects of Different Crust Types on Soil Aggregates and Organic Carbon of Vegetated Concrete Substrates
- Bulletin of Soiland Water Conservation Vol. 43, Issue 3, Pages: 414-420(2023)
- 作者机构：
  
  1. 三峡大学水泥基生态修复技术湖北省工程研究中心,湖北,宜昌,443002
  2. 三峡大学水利与环境学院,湖北,宜昌,443002
  3. 三峡大学生药与制药学院,湖北,宜昌,443002
  4. 三峡大学土木与建筑学院,湖北,宜昌,443002
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20230216.001
  CLC： S152
- Published：2023
- 稿件说明：
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Yan Shuxing, Xia Dong, Ai Shangjin, et al. Effects of Different Crust Types on Soil Aggregates and Organic Carbon of Vegetated Concrete Substrates[J]. Bulletin of Soiland Water Conservation, 2023, 43(3): 414-420.
DOI：

Yan Shuxing, Xia Dong, Ai Shangjin, et al. Effects of Different Crust Types on Soil Aggregates and Organic Carbon of Vegetated Concrete Substrates[J]. Bulletin of Soiland Water Conservation, 2023, 43(3): 414-420. DOI： 10.13961/j.cnki.stbctb.20230216.001.

摘要

[目的

]

分析土壤团聚体分布和有机碳含量特征，揭示生物结皮对边坡稳定和养分固持的影响，为生物结皮在修复工程中的运用提供参考和指导意见。[方法

]

以植被混凝土基材修复边坡为例，运用土壤干筛法、土壤湿筛法分别对结皮覆盖和无结皮覆盖坡面土壤的结皮层(0—2 cm)和结皮下层(2—7 cm)团聚体和有机碳特征进行研究。[结果

]

①生物结皮的存在明显影响了土壤团聚体分布、机械稳定性及R

0.25

含量。结皮覆盖层较CK(无结皮覆盖坡面)稳定性指标分别增加27.42%~33.51%(MWD)，21.66%~28.88%(GMD)，大团聚体含量(R

0.25

)增加10.68%，且苔藓类结皮影响最为显著。②湿筛法测定的不同结皮类型土壤团聚体均以＞0.25 mm粒径为主，其中结皮覆盖边坡的团聚体水稳性参数MWD，GMD，R

0.25

分别介于1.93~5.33 mm，0.85~3.16 mm，70.97%~87.50%，以苔藓覆盖边坡最大，D

值介于2.48~2.74间，以苔藓类值最小。团聚体水稳定性表现为苔藓覆盖边坡最好，裸坡最差。③结皮的存在促进了土壤有机碳累积，有机碳含量是CK组的两倍以上。其中对表层土壤有机碳水平提升作用明显，对下层土壤作用较低。④土壤有机碳含量与土壤水稳性参数MWD，GMD，R

0.25

呈显著正相关性(p＜0.05)，有机碳水平和团聚体稳定性联系密切，相互影响，有机碳水平的提高对增加团聚体稳定性具有重要作用。[结论

]

生物结皮的存在对修复边坡团聚体稳定和有机碳累积具有促进作用，结皮对生态修复边坡稳定和养分固持有一定的作用，且不同结皮类型作用强度不一，其中苔藓类和混生结皮固土和固碳效果最优。

Abstract

[Objective] The distribution of soil aggregates and the characteristics of organic carbon content were analyzed to determine the influence of biological crust on slope stability and nutrient retention in order to provide a reference and guidance for the application of biological crusts in slope restoration engineering.[Methods] Taking a restoration slope with vegetation concrete substrates as an example

the soil dry screening method and the soil wet screening method were used to study aggregates in the crust (0-2 cm) and subsurface layer (2-7 cm) and organic carbon characteristics of crust-covered and non-crust-covered slope soil.[Results] ① The presence of biological crusts significantly affected the distribution of soil aggregates

mechanical stability

and R0.25 content. Compared with the check treatment (CK

no crust-covered slope)

the stability index of the crust covering layer increased by 27.42%-33.51% (MWD) and 21.66%-28.88% (GMD)

and the content of large aggregates (R0.25) increased by 10.68%. Moss crust had the most significant impact. ② Soil aggregate particle size of different crust types measured by the wet sieving method were mainly>0.25 mm. The water stability parameters MWD

GMD

and R0.25 of the crust-covered slopes were between 1.93 and 5.33 mm

0.85 and 3.16 mm

and 70.97% and 87.50%

with moss-covered slopes having the largest values. The Dd values were between 2.48 and 2.74

with the smallest values observed for moss-covered slopes. The water stability of aggregates was best for moss-covered slopes and worst for bare slopes. ③ The presence of crust promoted the accumulation of organic carbon in the soil

and the organic carbon content was more than twice that of the CK treatment. The effect on the organic carbon level for the surface soil was obvious

and the effect for the subsurface soil layer was low. ④ There was a significant positive correlation between soil organic carbon content and soil water stability parameters MWD

GMD

and R0.25 (p<0.05). The level of organic carbon and the stability of aggregates were closely related and affected each other. Increasing organic carbon level played an important role in increasing aggregate stability.[Conclusion] The existence of a biological crust increases aggregate stability and organic carbon accumulation of repaired slopes. The crust has a certain effect on the stability of the ecologically repaired slope and on nutrient fixation. The strength of different crust types varies

with moss and mixed crusts having the best soil fixation and carbon sequestration effects.

关键词

Keywords

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