Linking dissolved organic carbon cycling to organic carbon fluxes in rice paddies under different water management practices
作者： Daniel Said-Pullicino , Eleonora F. Miniotti , Marcella Sodano , Chiara Bertora , Cristina Lerda
DOI: 10.1007/S11104-015-2751-7
关键词:
摘要: Although paddy soils are generally characterized by relatively high dissolved organic carbon (DOC) concentrations and fluxes, little is yet known on how water management influences the cycling of this important C pool. This work aims at providing insights into link between DOC during rice cropping input to subsoils export with surface waters, as well methane (CH4) emissions in a temperate soil function different practices. quantity, quality CH4 were evaluated field-scale over two seasons for three systems including continuous flooding, dry seeding delayed intermittent irrigation. strongly linked reducing conditions resulting from field flooding. In contrast or irrigation, adoption flooding not only favoured accumulation topsoil (>10–20 mg l−1), but also enhanced inputs subsoil (33–51 g m−2), exports waters (18–44 g m−2). Moreover, changes positive feedback abiotic release soil-derived DOC, substrate availability production. Water practices paddies affect temporal trends quantity season, implications fluxes.
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