Characteristics of Soil Aggregates and Organic Carbon Content for Ecological Restoration Slopes at Xiangjiaba Hydropower Station

Ma Jiaxin; Xia Dong; Liu Fang; Yan Shuxing; Duan Xiaoming

doi:10.13961/j.cnki.stbctb.20230831.001

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Characteristics of Soil Aggregates and Organic Carbon Content for Ecological Restoration Slopes at Xiangjiaba Hydropower Station

- Characteristics of Soil Aggregates and Organic Carbon Content for Ecological Restoration Slopes at Xiangjiaba Hydropower Station
- Bulletin of Soiland Water Conservation Vol. 43, Issue 5, Pages: 404-410(2023)
- 作者机构：
  
  1. 三峡大学生物与制药学院,湖北,宜昌,443002
  2. 水泥基生态修复技术湖北省工程研究中心,湖北,宜昌,443002
  3. 三峡大学水利与环境学院,湖北,宜昌,443002
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20230831.001
  CLC： S151.9;U213.1
- Published：2023
- 稿件说明：
移动端阅览
Ma Jiaxin, Xia Dong, Liu Fang, et al. Characteristics of Soil Aggregates and Organic Carbon Content for Ecological Restoration Slopes at Xiangjiaba Hydropower Station[J]. Bulletin of Soiland Water Conservation, 2023, 43(5): 404-410.
DOI：

Ma Jiaxin, Xia Dong, Liu Fang, et al. Characteristics of Soil Aggregates and Organic Carbon Content for Ecological Restoration Slopes at Xiangjiaba Hydropower Station[J]. Bulletin of Soiland Water Conservation, 2023, 43(5): 404-410. DOI： 10.13961/j.cnki.stbctb.20230831.001.

摘要

[目的

]

分析生态工程修复技术对土壤团聚体稳定性及有机碳分布的影响，为向家坝水电站不同生态修复边坡土壤结构稳定及碳汇功能的提升提供科学依据。[方法

]

以向家坝水电站4种不同生态修复边坡：植被混凝土(CBS)、厚层基材喷播(TB)、框格梁覆土(FB)、客土喷播(SS)表层土壤为研究对象，并以天然林(NF)和弃渣地(AS)两种自然恢复边坡为对照，采用湿筛法研究土壤团聚体分布和稳定性及其有机碳含量特征。[结果

]

①各边坡土壤均以＞0.25 mm的大团聚体粒径为主；其中天然林大团聚体含量最高，为81.83%；植被混凝土和厚层基材边坡次之，弃渣地含量最低，仅占55.19%。4个人工生态修复边坡的MWD和GMD均低于天然林高于弃渣地，其中厚层基材边坡的值最高，分别为2.96 mm和1.47 mm。客土喷播和弃渣地的分形维数(D)显著高于(p＜0.05)其余4个边坡。②各生态修复边坡措施均以＞0.25 mm粒径的大团聚体有机碳含量最高；除客土喷播和弃渣地外，其他修复措施和天然林均以＞2 mm粒级土壤团聚体贡献率最大。③相关性分析表明土壤SOC与MWD，GMD和R

0.25

呈极显著正相关(p＜0.01)，＞5 mm和5～2 mm粒级团聚体数量与土壤MWD，GMD，R

0.25

和土壤SOC均呈极显著正相关(p＜0.01)，与D呈极显著负相关(p＜0.01)。[结论

]

向家坝水电站研究区内厚层基材喷播技术和植被混凝土生态修复技术对土壤结构和有机碳库的改善效果比较接近天然林，客土喷播技术改善效果较差。

Abstract

[Objective] The effects of ecological engineering restoration technology on soil aggregate stability and organic carbon distribution were analyzed in order to provide a scientific basis for improving soil structure stability and carbon sink function of different ecological restoration slopes at Xiangjiaba Hydropower Station. [Methods] Four different ecological restoration slopes at Xiangjiaba Hydropower Station were studied: vegetation concrete (CBS)

thick base material spraying (TB)

frame beam covering soil (FB)

and external soil spraying (SS). The distribution and stability of soil aggregates and the characteristics of organic carbon content were determined by the wet sieve method for two natural restoration slopes: natural forest (NF) and abandoned land (AS

used as the control). [Results] ① The soil for each slope was dominated by large aggregates ＞0.25 mm. The macroaggregate content in natural forest was the highest (81.83%). The vegetation concrete and thick base material slope had the second highest macroaggregate contents

and the macroaggregate content of waste residue land was the lowest (55.19%). The MWD and GMD values of the four artificial ecological restoration slopes were lower than the values of the natural forest

and higher than the values of the waste residue land. The values of the thick substrate slope were the highest (2.96 mm and 1.47 mm)

respectively. The fractal dimension (D) of the soil spray seeding and slag field was significantly higher (p＜0.05) than observed for the other four slopes. ② The organic carbon contents of macro aggregates with particle size ＞0.25 mm were the highest in all ecological restoration slope measures. In addition to soil spray seeding and waste residue land

other restoration measures and natural forests had the largest contribution rate of ＞2 mm soil aggregates. ③ Correlation analysis showed that SOC was significantly positively correlated with MWD

GMD

and R0.25 (p＜0.01). Aggregates of size ＞5 mm and 5—2 mm were significantly positively correlated with soil MWD

GMD

R0.25

and SOC (p＜0.01)

and significantly negatively correlated with D (p＜0.01). [Conclusion] In the study area of Xiangjiaba Hydropower Station

thick substrate spraying technology and vegetation concrete ecological restoration technology improved soil structure and organic carbon pool similarly to natural forest. The improvement effect of external soil spraying technology was poor.

关键词

Keywords

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