Abstract
Improved soil carbon sink capability is important for the mitigation of carbon dioxide emissions and the enhancement of soil productivity. Biochar and organic fertilizer (OF) showed a significant improving effect on microalgae in soil carbon sink capacity, and the ultimate soil total organic carbons with microalgae-OF, microalgae-biochar, microalgae-OF-biochar were about 16, 67 and 58% higher than that with microalgae alone, respectively, indicating that carbon fixation efficiency of microalgae applied in soil was improved with biochar and OF whilst the soil carbon capacity was promoted, the mechanism of which is illustrated through simulative experiments. Organic fertilizer could spur algal conversion of carbon into cell molecules by increasing intracellular polysaccharide production of microalgae. Biochar could change carbon metabolism pathway of microalgae through altering the yield of intracellular saccharides, and yield and type of extracellular saccharides. There was a superimposition effect on the soil carbon sink when biochar and OF were both present with microalgae.
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Acknowledgements
This work was supported by Natural Science Foundation of Shanghai (No.16ZR1440000); Youth Innovation Fund for Interdisciplinary Research of SARI (No. Y526453235); National Natural Science Foundation of China (No. 21307093); and the Research Grants Council of the Hong Kong SAR, China (No. 28300015 and No. 18202116).
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Zhang, S., Wang, L., Wei, W. et al. Enhanced roles of biochar and organic fertilizer in microalgae for soil carbon sink. Biodegradation 29, 313–321 (2018). https://doi.org/10.1007/s10532-017-9790-0
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DOI: https://doi.org/10.1007/s10532-017-9790-0