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Reduction of global warming potential contribution from a rice field by irrigation, organic matter, and fertilizer management
Author(s) -
Yu Kewei,
Chen Guanxiong,
Patrick William H.
Publication year - 2004
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1029/2004gb002251
Subject(s) - paddy field , global warming potential , organic matter , irrigation , environmental science , global warming , fertilizer , soil organic matter , agronomy , chemistry , greenhouse gas , soil water , soil science , climate change , ecology , organic chemistry , biology
The major objective of this study is to find a feasible management practice to mitigate the cumulative global warming potential (GWP) from CH 4 and N 2 O emission in an irrigated rice field. Nonflooding (but wet) conditions reduced CH 4 emission by 79 and 71% from the fields with and without organic matter (OM) addition, respectively. This was mainly due to the desirable soil redox status in the nonflooded fields with less CH 4 production and more CH 4 oxidation when CH 4 diffused up the soil profile. Increase in N 2 O emission from the nonflooded fields offset part of the reduction in CH 4 emission, especially when OM was not added. Thus the nonflooding treatment reduced the cumulative GWP by 72% in the OM‐added field but only 46% in the field without OM addition. Under flooding conditions, no OM addition reduced CH 4 emission by 57%, but rice yield was decreased by 16% in comparison with the OM‐added fields. The best management practice proposed from this study is to keep the fields nonflooded but wet with OM addition, which largely reduced the GWP from the fields with no decrease in rice yield.