Changes in Soil Aggregates Composition Stabilization and Organic Carbon during Deterioration of Alpine Grassland

4th International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Li, Li^1 ; Yuan, Zhengrong^1 ; Li, Fucheng^1^2

College of Resource and Environment, Southwest University of Science and Technology, Mianyang

621010, China^1

Sichuan Key Laboratory of Soil Environmental Pollution Control and Remediation, Chengdu

610045, China^2

关键词: Degradation stages;    Grassland degradation;    Organic carbon contents;    Soil aggregate stability;    Soil organic carbon;    Soil organic carbon content;    Stability indices;    Transformation process;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/237/3/032068/pdf
DOI  :  10.1088/1755-1315/237/3/032068

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The stability of alpine grassland ecosystem is closely related to the stability of soil structure. The objectives of this study were to analyze the characteristics of soil aggregates and organic carbon in different degradation stages of alpine grassland in northwest Sichuan, and to build the relationship between soil organic carbon and aggregates. The results showed that the non-degraded grassland was dominated by macro-aggregates (>0.25 mm), while the degraded grassland was dominated by micro-aggregates. Both soil aggregate stability and soil organic carbon content were significantly reduced with the intensification of grassland degradation. The soil organic carbon content in degraded grassland was significantly lower than that in non-degraded grassland, and the fastest decline stages of the soil organic carbon occurred in the transformation processes from non-degraded to lightly degraded. The highest value of the soil aggregate organic carbon appeared in the 0.5-2 mm size, and the organic carbon content of each aggregate also decreased with the grassland degradation. The soil organic carbon and soil aggregate organic carbon were significantly correlated with the stability index of soil aggregate in the process of grassland degradation (P