Premium
Influence of Different Seedling‐Nursing Methods on Methane and Nitrous Oxide Emissions in the Double Rice Cropping System of South China
Author(s) -
Liu Ying L.,
Dokohely Mario E.,
Fan Chang H.,
Li Qiao L.,
Zhang Xiao X.,
Zhao Hia Y.,
Xiong Zheng Q.
Publication year - 2016
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201400479
Subject(s) - seedling , nitrous oxide , irrigation , environmental science , agronomy , wetland , cropping , methane , horticulture , agriculture , biology , ecology
Numerous studies on methane (CH 4 ) and nitrous oxide (N 2 O) emissions during the rice growth period have focused on paddy fields, but CH 4 and N 2 O emissions from rice seedling nurseries are poorly documented. This holds especially true for South China, where the double rice cropping system dominates. Here, we report CH 4 and N 2 O emissions from three types of rice seedling nurseries in South China: Seedlings raised on wetland soil beds (WSB) with continuous flooding, seedlings raised on dry land soil beds (DSB), and seedlings raised in wet conditions with moist irrigation on plastic trays (WPT). Moreover, global warming potential (GWP) for all the three seedling nursing systems were estimated over a 100‐year horizon. The results show that the WSB method produced the highest CH 4 with negligible N 2 O emissions. Among the three methods, the DSB plots emitted the highest N 2 O and thus the highest GWP. Relative to the WSB method, the WPT method significantly decreased total CH 4 emissions by 45%, and the WPT method decreased GWPs by 28 and 68% compared to the WSB and DSB method, respectively. The GWP of CH 4 and N 2 O of WSB, DSB, and WPT account 30, 68, and 22% of that for the whole transplanted early‐rice growing season for an equal unit area, indicating that GHGs from seedling stage were not negligible. Moreover, the WPT method produced the best rice seedlings. Therefore, utilizing WPT instead of conventional WSB is proposed as a best method for mitigating the GWPs of CH 4 and N 2 O while growing healthy seedlings in rice nurseries in the double rice cropping system in South China.