期刊
ECOLOGICAL ENGINEERING
卷 94, 期 -, 页码 329-336出版社
ELSEVIER
DOI: 10.1016/j.ecoleng.2016.06.004
关键词
Biochar; Coastal soil; Carbon mineralization; Microbial biomass carbon; Coastal wetlands; the Yellow River Delta
资金
- National Program on Key Basic Research Project (973 Program) [2015CB453301]
- National Marine Public Welfare Research Project of China [201305021, 201405007]
- National Natural Science Foundation of China [41573089, 41325013, 41406085]
Biochar (BC) application for improving soil quality and carbon sequestration has generated great interest for scientists and policy makers. BC can influence soil organic carbon (SOC) mineralization through priming effects. Positive, negative or no priming effects on C mineralization has been observed following BC additions to soils. However, uncertainty still remains about the influence of biochar on SOC mineralization in the coastal wetland soils of the Yellow River Delta, China. Therefore, a five months of incubation experiment using the coastal wetland soil was conducted to investigate the effects of adding BC produced from peanut shell at 350 degrees C on SOC mineralization at the rates of 0% (0%BC), 0.1% (0.1%BC), 1% (1%BC) and 3% (3%BC) (w/w). BC addition increased the cumulative CO2 emissions, indicating that the cumulative SOC mineralization was enhanced in the coastal soil by BC application. However, the increased C mineralized only accounted for 1.71%, 0.32% and 0.17% of the BC-C added in the 0.1%BC, 1%BC and 3%BC treatments, respectively. Moreover, the experimental values of SOC mineralization was much lower than that of the theoretical values in both 1%BC and 3%BC treatments, indicating that a negative priming effect occurred. This may be explained by two reasons: (1) the conversion process of SOC to dissolved inorganic C (DIC) was accelerated by BC addition, which was confirmed by SEM image; (2) the amounts of available C substrate and microorganisms decreased via the sorption of labile organic C (LOC) and microorganisms onto BC. These results suggest that BC application will enhance soil C storage in the salinized wetland soils. (C) 2016 Elsevier B.V. All rights reserved.
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