Effects of Biochar Amendment on CO 2 Emissions from Paddy Fields under Water-Saving Irrigation

Shihong Yang, Zewei Jiang, Xiao Sun, Jie Ding and Junzeng Xu
Additional contact information
Shihong Yang: State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
Zewei Jiang: College of Agricultural Engineering, Hohai University, Nanjing 210098, China
Xiao Sun: College of Agricultural Engineering, Hohai University, Nanjing 210098, China
Jie Ding: College of Agricultural Engineering, Hohai University, Nanjing 210098, China
Junzeng Xu: State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China

IJERPH, 2018, vol. 15, issue 11, 1-12

Abstract: The role of carbon pool of biochar as a method of long-term C sequestration in global warming mitigation is unclear. A two-year field study was conducted to investigate the seasonal variations of CO 2 emissions from water-saving irrigation paddy fields in response to biochar amendment and irrigation patterns. Three biochar treatments under water-saving irrigation and one biochar treatment under flooding irrigation were studied, and the application rates were 0, 20, 40, and 40 t ha −1 and labeled as CI + NB (controlled irrigation and none biochar added), CI + MB (controlled irrigation and medium biochar added), CI + HB (controlled irrigation and high biochar added), and FI + HB (flood irrigation and high biochar added), respectively. Results showed that biochar application at medium rates (20 t ha −1 ) decreased CO 2 emissions by 1.64–8.83% in rice paddy fields under water-saving irrigation, compared with the non-amendment treatment. However, the CO 2 emissions from paddy fields increased by 4.39–5.43% in the CI + HB treatment, compared with CI + NB. Furthermore, the mean CO 2 emissions from paddy fields under water-saving irrigation decreased by 2.22% compared with flood irrigation under the same amount of biochar application (40 t ha −1 ). Biochar amendment increased rice yield and water use efficiency by 9.35–36.30% and 15.1–42.5%, respectively, when combined with water-saving irrigation. The CO 2 emissions were reduced in the CI + MB treatment, which then increased rice yield. The CO 2 emissions from paddy fields were positively correlated with temperature. The highest value of the temperature sensitivity coefficient (Q 10 ) was derived for the CI + MB treatment. The Q 10 was higher under water-saving irrigation compared with flooding irrigation.

Keywords: water-saving irrigation; biochar; CO 2; Q 10; paddy field (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

Downloads: (external link)
https://www.mdpi.com/1660-4601/15/11/2580/pdf (application/pdf)
https://www.mdpi.com/1660-4601/15/11/2580/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:15:y:2018:i:11:p:2580-:d:183694

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().