Bedrock outcrops weakly promote rather than inhibit soil carbon sequestration after vegetation restoration

基岩 植被(病理学) 土壤碳 露头 固碳 恢复生态学 环境科学 喀斯特 土壤科学 堆积密度 土壤质量 地质学 水文学(农业) 土壤水分 氮气 化学 生态学 地球化学 地貌学 病理 古生物学 生物 有机化学 医学 岩土工程
作者
Lin Xu,Jiguang Zhang,Peilei Hu,Wei Zhang,Lumei Xiao,Yingying Ye,Dan Xiao,Jie Zhao,Jun Xiao,Kelin Wang
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:858: 159470-159470 被引量:9
标识
DOI:10.1016/j.scitotenv.2022.159470
摘要

Vegetation restoration can increase soil carbon (C) content in karst regions characterized by highly exposed carbonate rocks; however, it remains unclear whether and how bedrock outcrops contribute to soil C-accumulation after vegetation restoration. We aimed to investigate the magnitude and mechanisms of bedrock outcrops on soil C-accumulation after vegetation restoration. Here, we selected 362 fixed locations to investigate changes in soil organic carbon (SOC) content and density before and after cropland restoration in a karst catchment with varying bedrock exposure ratios and initial soil C pools prior to restoration. Active vegetation restoration (i.e., cropland converted to forage grass, plantation forest, and a combination of grass and forest) and natural regeneration (cropland abandoned) were compared, with croplands maintained with no change as the control. Compared to croplands maintained with no change, SOC density significantly increased in the four vegetation restoration types. The SOC accumulation rate was higher for natural regeneration (39 g C m-2 yr-1) than for the three active restoration strategies (18-27 g C m-2 yr-1). SOC accumulation decreased with a higher initial pool size of soil C but increased with nitrogen accumulation and soil exchangeable calcium (Ca2+) concentration. Higher bedrock outcrops reduced soil volume but increased SOC content through their indirect effects on the initial pool size of soil C, external nitrogen inputs, and soil Ca2+ concentration. This weakly promoted rather than inhibited SOC sequestration. Our findings highlight the effectiveness of various restoration strategies in promoting SOC accumulation in karst areas, as well as the need to take bedrock outcrops and initial soil C pools into consideration when modeling SOC dynamics and maximizing C sinks for vegetation restoration.
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