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DIVISION S-3—SOIL BIOLOGY & BIOCHEMISTRY

Soil Moisture between Rice-Growing Seasons Affects Methane Emission, Production, and Oxidation

^a Lab. of Material Cycling in Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
^b National Institute of Agro-Environmental Sciences, 3-1-1, Kannondai, Tsukuba 305, Japan

^* Corresponding author (hxu{at}issas.ac.cn)

Methane (CH₄) emissions from rice (Oryza sativa L.) fields are believed to contribute to the greenhouse effect. Earlier studies on CH₄ emission were mostly focused on the rice-growing season. The objective of this study was to determine the effects of soil moisture during the non-rice growing season on CH₄ emission, production, and oxidation within the subsequent rice-growing season. Five moisture levels ranging from air-dryness to flooding were established in pots during the non-rice growing season. The CH₄ fluxes from rice soils in the pots were monitored in a closed chamber and dark incubation was performed to determine CH₄ production and oxidation potentials. Both CH₄ emission and production increased significantly as the soil got wetter except when it was air-dried. The CH₄ oxidation potential was also stimulated by the previous higher soil water content, which therefore buffered emission of the gas as its production increased. Soil water content considerably affected the seasonal variation pattern of CH₄ flux and soil redox potential (E_H). The higher the soil water content, the quicker soil E_H declined and the earlier CH₄ emission initiated after rice transplantation. Previous soil water content significantly affected soil organic C content before rice transplantation. Within the rice-growing season both the mean CH₄ flux and its production rate were significantly correlated with soil organic C content. Thus water-history-induced change of soil organic C content may have affected soil reduction rate, and then CH₄ production and emission within the rice-growing season. The results demonstrate how water management between rice crops can regulate CH₄ emission, production, and oxidation during the rice-growing season.

Abbreviations: SWHP, soil water-holding capacity

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