Microalgae-derived hydrochar application on rice paddy soil: higher rice yield but increased gaseous nitrogen loss

Chu, Q, Xue, L, Cheng, Y, Liu, Y, Feng, Y, Yu, S, Meng, L, Pan, G ORCID: https://orcid.org/0000-0003-0920-3018, Hou, P, Duan, J and Yang, L, 2020. Microalgae-derived hydrochar application on rice paddy soil: higher rice yield but increased gaseous nitrogen loss. Science of The Total Environment, 717: 137127. ISSN 0048-9697

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Abstract

Hydrothermal carbonization represents a promising technique for transforming microalgae into the hydrochar with abundant phytoavailable nutrients. However, the effects of microalgae-derived hydrochars on the gaseous nitrogen (N) loss from agricultural field are still unclear. Chlorella vulgaris powder (CVP) and two Chlorella vulgaris-derived hydrochars that employ water (CVHW) or citrate acid solution (CVHCA) as the reaction medium were applied to a soil column system grown with rice. The temporal variations of nitrous oxide (N2O) emissions and ammonia (NH3) volatilization were monitored during the whole rice-growing season. Results showed that CVHW and CVHCA addition significantly increased the grain yield (by 13.5–26.8% and 10.5–23.4%) compared with control and CVP group, while concomitantly increasing the ammonia volatilization (by 53.8% and 72.9%) as well as N2O emissions (by 2.17- and 2.82-fold) from paddy soil compared to control. The microbial functional genes (AOA, AOB, nirk, nirS, nosZ) in soil indicated that CVHW and CVHCA treatment stimulated the nitrification and denitrification, and inhibited the N2O oxidation in soil. Notably, CVHW was recommended in the view of improving yield and controlling NH3 volatilization because no significant difference of the yield-scale NH3 volatilization was detected between control and CVHW treatment. This study for the first time uncovered that Chlorella vulgaris-derived hydrochars have positive effects on rice N utilization and growth but negative effects on the atmospheric environment.

Item Type:	Journal article
Publication Title:	Science of The Total Environment
Creators:	Chu, Q., Xue, L., Cheng, Y., Liu, Y., Feng, Y., Yu, S., Meng, L., Pan, G., Hou, P., Duan, J. and Yang, L.
Publisher:	Elsevier
Date:	15 May 2020
Volume:	717
ISSN:	0048-9697
Identifiers:	Number Type 10.1016/j.scitotenv.2020.137127 DOI S0048969720306379 Publisher Item Identifier 1289271 Other
Divisions:	Schools > School of Animal, Rural and Environmental Sciences
Record created by:	Jonathan Gallacher
Date Added:	06 Feb 2020 14:33
Last Modified:	26 Mar 2020 10:03
URI:	https://irep.ntu.ac.uk/id/eprint/39186

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