Impact of Water Management on Methane Emission Dynamics in Sri Lankan Paddy Ecosystems
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Impact of Water Management on Methane Emission Dynamics in Sri Lankan Paddy Ecosystems. / Lakshani, M. M.Tharindi; Deepagoda, T. K.K.Chamindu; Li, Yuan; Hansen, H.F.E.; Elberling, Bo; Nissanka, Sarath P.; Senanayake, Dassanayake M.J.B.; Hamamoto, Shoichiro; Babu, G. L. Sivakumar; Chanakya, Hoysala N.; Parameswaran, T. G.; Arunkumar, Pandit G.; Sander, Bjoern Ole; Clough, Timothy J.; Smits, Kathleen.
In: Water (Switzerland), Vol. 15, No. 21, 3715, 2023.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Impact of Water Management on Methane Emission Dynamics in Sri Lankan Paddy Ecosystems
AU - Lakshani, M. M.Tharindi
AU - Deepagoda, T. K.K.Chamindu
AU - Li, Yuan
AU - Hansen, H.F.E.
AU - Elberling, Bo
AU - Nissanka, Sarath P.
AU - Senanayake, Dassanayake M.J.B.
AU - Hamamoto, Shoichiro
AU - Babu, G. L. Sivakumar
AU - Chanakya, Hoysala N.
AU - Parameswaran, T. G.
AU - Arunkumar, Pandit G.
AU - Sander, Bjoern Ole
AU - Clough, Timothy J.
AU - Smits, Kathleen
N1 - Publisher Copyright: © 2023 by the authors.
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
KW - alternative wetting and draining
KW - continuous flooding
KW - crop yield
KW - methane
KW - water consumption
U2 - 10.3390/w15213715
DO - 10.3390/w15213715
M3 - Journal article
AN - SCOPUS:85176598671
VL - 15
JO - Water
JF - Water
SN - 2073-4441
IS - 21
M1 - 3715
ER -
ID: 374932296