NDLI: A comparison of methane emissions following rice paddies conversion to crab-fish farming wetlands in southeast China

Content Provider	Springer Nature Link
Author	Hu, Zhiqiang Wu, Shuang Ji, Cheng Zou, Jianwen Zhou, Quansuo Liu, Shuwei
Copyright Year	2015
Abstract	Rice paddies and aquaculture wetlands are typical agricultural wetlands that constitute one of the important sources of atmospheric methane (CH$_{4}$). Traditional transplanted rice paddies have been experiencing conversion to pond aquaculture wetlands for pursuing higher economic benefits over the past decades in southeast China. A parallel field experiment was carried out to compare CH$_{4}$ emissions from a transplanted rice paddy and its converted crab-fish farming wetland in southeast China. Over the rice-growing season, CH$_{4}$ fluxes averaged 1.86 mg m$^{−2}$ h$^{−1}$ from rice paddies, and 1.14 and 0.50 mg m$^{−2}$ h$^{−1}$ for the treatments with or without aquatic vegetation present in the crab-fish farming wetlands, respectively. When averaged across the treatments, seasonal CH$_{4}$ emissions from crab-fish framing wetlands were 52 % lower than those from rice paddies. The CH$_{4}$ fluxes were negatively related to water dissolved oxygen (DO) concentration but positively related to soil/sediment dissolved organic carbon (DOC) content in crab-fish farming wetlands. Dependence of CH$_{4}$ fluxes on DO or DOC was intensified by the aquatic vegetation presence. By extrapolating the present CH$_{4}$ emission rate with the current rice paddy-converted aquaculture cultivation area, the seasonal CH$_{4}$ emissions from inland aquaculture wetlands during the critical farming stage (20 June to 18 October) were estimated to be 33.6 Gg ha$^{−1}$ in southeast China in 2012. Rice paddies conversion to crab-fish farming wetlands might have reduced CH$_{4}$ emissions by 22–54 % in mainland China. Results of this study suggest that the conversion of transplanted rice paddies to crab-fish aquaculture wetlands for higher economic benefits would also lead to a lower ecosystem CH$_{4}$ release rate.
Starting Page	1505
Ending Page	1515
Page Count	11
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	23
Issue Number	2
e-ISSN	16147499
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-09-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Agricultural land-use shift Methane Paddy field Crab-fish farming wetland Mitigation potential Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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