Methane and nitrous oxide emissions in the rice-shrimp rotation system of the Vietnamese Mekong Delta.

Autor: Thao HV; Department of Environmental Sciences, College of Environment and Natural Resources, Can Tho University, 3/2 street, Can Tho city, 900000, Viet Nam.; United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu city, 183-8538, Tokyo, Japan., Cong NV; Department of Environmental Sciences, College of Environment and Natural Resources, Can Tho University, 3/2 street, Can Tho city, 900000, Viet Nam., Nhung LTC; Western Highlands Agriculture and Forestry Science Institute, Buon Ma Thuot city, Dak Lak, 630000, Viet Nam., Kha TH; Department of Environmental Sciences, College of Environment and Natural Resources, Can Tho University, 3/2 street, Can Tho city, 900000, Viet Nam., Khanh HC; Department of Environmental Sciences, College of Environment and Natural Resources, Can Tho University, 3/2 street, Can Tho city, 900000, Viet Nam.; Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki city, 852-8521, Japan., Dang LV; United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu city, 183-8538, Tokyo, Japan.; College of Agriculture, Can Tho University, Can Tho city, 900000, Viet Nam., Duy NP; WWF-Vietnam, No. 6, Lane 18, Nguyen Co Thach Street, Nam Tu Liem District, Ha Noi, 100000, Viet Nam., Tinh HQ; WWF-Vietnam, No. 6, Lane 18, Nguyen Co Thach Street, Nam Tu Liem District, Ha Noi, 100000, Viet Nam., Vi TNL; WWF-Vietnam, No. 6, Lane 18, Nguyen Co Thach Street, Nam Tu Liem District, Ha Noi, 100000, Viet Nam., Chi NP; Department of Environmental Sciences, College of Environment and Natural Resources, Can Tho University, 3/2 street, Can Tho city, 900000, Viet Nam., Nam TS; Department of Environmental Sciences, College of Environment and Natural Resources, Can Tho University, 3/2 street, Can Tho city, 900000, Viet Nam.
Jazyk: angličtina
Zdroj: Heliyon [Heliyon] 2024 Aug 08; Vol. 10 (16), pp. e35759. Date of Electronic Publication: 2024 Aug 08 (Print Publication: 2024).
DOI: 10.1016/j.heliyon.2024.e35759
Abstrakt: Rice-shrimp rotation systems are one of the widespread farming practices in the Vietnamese Mekong Delta coastal areas. However, greenhouse gas (GHG) emissions in the system have remained unclear. This study aimed to examine methane (CH 4 ) and nitrous oxide (N 2 O) emissions from the system, including (i) land-based versus high-density polyethylene-lined (HDPE) nursery ponds and (ii) conventional versus improved grow-out ponds inoculated with effective microorganisms (EM) bioproducts. The results showed that CH 4 flux in land-based and HDPE-lined nursery ponds were 1.04 and 0.25 mgCH 4 m -2 h -1 , respectively, while the N 2 O flux was 8.37 and 6.62 μgN 2 O m -2 h -1 , respectively. Global warming potential (GWP) from land-based nursery ponds (18.3 g CO 2eq m -2 ) was approximately 3 folds higher than that of the HDPE-lined nursery pond (6.1 g CO 2eq m -2 ). Similarly, the mean CH 4 and N 2 O fluxes were 15.84 mg CH 4 m -2 h -1 and 7.17 μg N 2 O m -2 h -1 for the conventional ponds, and 10.51 mg CH 4 m -2 h -1 and 7.72 μg N 2 O m -2 h -1 for the improved grow-out ponds. Conventional practices (2388 g CO 2eq m -2 ) had a higher 1.5-fold GWP compared to the improved grow-out pond (1635 g CO 2eq m -2 ). The continuation of the land-based nursery pond and conventional aquacultural farming practices increase CH 4 emission and GWP, while applying HDPE-lined nursery ponds combined with improved grow-out ponds could be a promising approach for reducing GHG emissions in rice-shrimp rotation systems. This study recommends further works in the rice-shrimp rotation systems, including (i) an examination of the effects of remaining rice stubbles in the platform on the availability of TOC levels and GHG emissions and (ii) ameliorating dissolved oxygen (DO) concentration on the effectiveness of GHG emission reduction.
Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(© 2024 The Authors.)
Databáze: MEDLINE
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