The inhibitory effect of a water-saving irrigation regime on CH4 emission in Mollisols under straw incorporation for 5 consecutive years

Tangzhe Nie, Jianyi Huang, Zhongxue Zhang, Peng Chen, Tiecheng Li and Changlei Dai

Agricultural Water Management, 2023, vol. 278, issue C

Abstract: Methane (CH4), as a important source of greenhouse gases from paddy ecosystem was overestimated under multi-year straw incorporation. However, how CH4 can be affected by multi-year straw incorporation under different water-saving techniques is little known. In this study, the effects of straw incorporation years and irrigation regime on CH4 emission and its potential mechanism in Mollisols were investigated by conducting a multi-year in-situ experiment. The following 4 treatments were included: controlled irrigation + straw incorporation for 1 year (C1), controlled irrigation + straw incorporation for 5 consecutive years (C5), flooded irrigation + straw incorporation for 1 year (F1) and flooded irrigation + straw incorporation for 5 consecutive years (F5). Methane fluxes, soil microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), dissolved organic carbon (DOC), the relative abundance of methanogens and methanotrophs were determined. The results showed that straw incorporation for 5 consecutive years increased NH4+-N, NO3--N, DOC, MBC which led a increased in rice yield by 4.42–5.84% compared with 1 year straw incorporation. Controlled irrigation significantly reduced CH4 emission in Mollisols by 70.2–79.7% compared with flooded irrigation, and this reduction was more obvious under 5-year straw incorporation. The consequence of decreased CH4 emission was mainly affect by the decrease in DOC content. Another key reason of decreasing CH4 emissions under controlled irrigation was the relative abundance difference between methanogens and methanogens, which decreased from 266.7% to 19.3%. The present study provides a further detailed understanding of the CH4 emission mechanism for straw and irrigation management in Mollisols.

Keywords: Mollisols; Methane emission; Straw incorporation; Water-saving irrigation; Methanogens; Methanotrophs (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0378377423000288
Full text for ScienceDirect subscribers only

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:eee:agiwat:v:278:y:2023:i:c:s0378377423000288

DOI: 10.1016/j.agwat.2023.108163

Access Statistics for this article

Agricultural Water Management is currently edited by B.E. Clothier, W. Dierickx, J. Oster and D. Wichelns

More articles in Agricultural Water Management from Elsevier
Bibliographic data for series maintained by Catherine Liu ().