期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 521, 期 -, 页码 52-58出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2015.03.074
关键词
Karst peak-cluster depression; Soil organic carbon; Silt content; Litter; Microbial biomass; Enzyme activities
资金
- National Key Basic Research Program of China [2015CB452703]
- Chinese Academy of Sciences [Y523101030]
- National Natural Science Foundation of China [31270555, 41471445]
- Western Light Program from Chinese Academy of Sciences
Vegetation succession enhances the accumulation of carbon in the soil. However, little is known about the mechanisms underlying soil organic carbon (SOC) accumulation in different vegetation types in the karst region of Southwest China. The goal of this study was to identify and prioritize the effects of environmental parameters, including soil physico-chemical properties, microbial biomass, enzyme activities, and litter characteristics, on SOC accumulation along a vegetation succession sere (grassland, shrubland, secondary forest, and primary forest) in the karst landscape of Southwest China. Relationships between these parameters and SOC were evaluated by redundancy analysis. The results showed that SOC accumulation was significantly different among vegetation types (P < 0.01) and increased with vegetation succession (from 29.10 g.kg(-1) in grassland to 73.92 g.kg(-1) in primary forest). Soil biochemistry and physical characteristics significantly affected the accumulation of SOC. Soil microbial biomass showed a predominant effect on SOC in each of the four vegetation types. In addition, the soil physical property (especially the silt content) was another controlling factor in the early stages (grassland), and urease activity and saccharase activity were important controlling factors in the early-middle and middle-late stages, respectively. Litter characteristics only showed mild effects on SOC accumulation. Variation partitioning analysis showed that the contribution of sole main factors to SOC variation decreased, while the interaction effect among parameters increased along the succession gradient. (C) 2015 Elsevier B.V. All rights reserved.
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