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

文献类型： 外文期刊

作者： Chu, Qingnan 1 ; Xue, Lihong 1 ; Cheng, Yueqin 2 ; Liu, Yang 3 ; Feng, Yanfang 1 ; Yu, Shan 1 ; Meng, Lin 6 ; Pan, Gang 7 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Minist Agr & Rural Affairs, Key Lab Agroenvironm Downstream Yangtze Plain, Nanjing 210014, Jiangsu, Peoples R China

2.Nanjing Stn Qual Protect Cultivated Land, Nanjing 210036, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Agr Informat, Res Ctr IoT Agr Applicat, Nanjing 210014, Peoples R China

4.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212001, Jiangsu, Peoples R China

5.Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA

6.Chinese Acad Agr Sci, Tobacco Res Inst, Minist Agr & Rural Affairs, Key Lab Tobacco Biol & Proc, Qingdao 266101, Peoples R China

7.Nottingham Trent Univ, Sch Anim Rural & Environm Sci, Ctr Integrat Water Energy Food Studies, Brackenhurst Campus, Nottingham NG25 0QF, Notts, England

关键词： Ammonia volatilization; Chlorella vulgaris; Hydrothemia carbonization; Nitrogen use efficiency; Nitrous oxide emission; Non-point pollution

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2020 年 717 卷

页码：

收录情况： SCI

摘要： 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 10.5-23A%) 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 deni tri ficat ion, 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 Corresponding 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. (C) 2020 Elsevier B.V. All rights reserved.

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