期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 767, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.145298
关键词
Soil organic carbon fraction; Soil microbial community; Calcium; Climatic gradient; Karst ecosystem
资金
- National Natural Science Foundation of China [41930652, 31870502, 32001231, 42001049]
- China Postdoctoral Science Foundation [2020M682585]
- National Natural Science Foundation of Guangxi Province [2018GXNSFBA138014]
- Guangxi Bagui Scholarship Program
Both managed plantation forest and naturally recovered shrubland vegetation restoration strategies can increase soil organic carbon density, with temperature potentially intensifying the effects of vegetation restoration on SOC sequestration.
Vegetation restoration has been proposed as an effective strategy for increasing soil organic carbon (SOC) sequestration. However, the responses of SOC to managed and natural vegetation restoration strategies at a large scale are poorly understood due to the varying SOC components and changing climatic conditions. Here, we measured bulk SOC, particulate organic carbon (POC), and mineral-associated organic carbon (MOC) after 15 years of vegetation restoration along an elevation gradient with a corresponding temperature gradient in the calcareous soils of karst region, Southwest China. We compared managed plantation forest and naturally recovered shrubland vegetation restoration strategies, using cropland and mature forest as references. Overall, we found that the SOC and POC densities in both plantation forest and shrubland were significantly higher than in the cropland but lower than in the mature forest. There were no significant differences in the SOC pool between the plantation forest and shrubland. Furthermore, the relative changes in the SOC and POC densities increased with increasing mean annual temperature in the plantation forest and shrubland. Our results showed that both vegetation restoration strategies, characterized by higher soil microbial abundance and exchangeable Ca concentration, were beneficial to POC but not MOC accumulation, and sufficiently compensated SOC decomposition at lower elevation with higher MAT. Our results highlight the potential of both vegetation restoration strategies for promoting SOC accumulation in warmer karst regions and emphasize the necessity to understand soil carbon stabilization mechanisms in calcareous soils. (C) 2021 Elsevier B.V. All rights reserved.
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