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Impact of Water Management on Methane Emission Dynamics in Sri Lankan Paddy Ecosystems

Lakshani, MMT and Deepagoda, TKKC and Li, Y and Hansen, HFE and Elberling, B and Nissanka, SP and Senanayake, DMJB and Hamamoto, S and Babu, GLS and Chanakya, HN and G, PT and Arunkumar, PG and Sander, BO and Clough, TJ and Smits, K (2023) Impact of Water Management on Methane Emission Dynamics in Sri Lankan Paddy Ecosystems. In: Water (Switzerland), 15 (21).

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Official URL: https://doi.org/10.3390/w15213715


Paddy ecosystems constitute a dominant source of greenhouse gases, particularly of methane (CH4), due to the continuous flooding (CF) practiced under conventional paddy cultivation. A new management method, namely alternative wetting and draining (AWD) (i.e., flooding whenever surface water levels decline to 15 cm below the soil surface), is an emerging practice developed to mitigate CH4 emissions while providing an optimal solution for freshwater scarcity. Despite extensive paddy cultivation in Sri Lanka, no systematic research study has been conducted to investigate CH4 emissions under different water management practices. Thus, field experiments were conducted in Sri Lanka to investigate the feedback of controlled water management on seasonal and diel variation of CH4 emission, water consumption, and crop productivity. Adopting the same rice variety, two water management methods, continuous flooding (CF) and alternative wetting and draining (AWD), were compared with plants (W/P) and without plants (N/P) present. The emission of CH4 was measured using the static closed chamber method. The results show a 32 reduction in cumulative CH4 emission, on average, under AWD when compared to CF. The yield under the AWD was slightly higher than that of CF. Although it was not statistically significant (p > 0.05) there was not any reduction in yield in AWD than in CF. The total water saving under AWD ranged between 27�35 when compared to CF. Thus, the results support (without considering the effect of nitrous oxide) AWD as a promising method for mitigating CH4 emissions while preserving freshwater and maintaining grain yield in paddy systems. © 2023 by the authors.

Item Type: Journal Article
Publication: Water (Switzerland)
Publisher: Multidisciplinary Digital Publishing Institute (MDPI)
Additional Information: The copyright for this article belongs to authors.
Keywords: Crops; Ecosystems; Floods; Greenhouse gases; Nitrogen oxides; Surface waters; Water conservation; Water levels; Water management; Wetting, Alternative wetting and draining; CH 4; Continuous flooding; Crop yield; Floodings; Management method; Paddy cultivation; Paddy ecosystems; Water consumption; Waters managements, Methane
Department/Centre: Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Division of Mechanical Sciences > Civil Engineering
Date Deposited: 28 Feb 2024 12:58
Last Modified: 28 Feb 2024 12:58
URI: https://eprints.iisc.ac.in/id/eprint/83663

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