Relationships between the potential production of the greenhouse gases CO2, CH4 and N2O and soil concentrations of C, N and P across 26 paddy fields in southeastern China
Paddy fields are a major global anthropogenic source of greenhouse gases. China has the second largest area under rice cultivation, so determining the relationships between the emission of greenhouse gases and soil carbon content, nutrient availabilities and concentrations and physical properties is...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:179968 |
| Acceso en línea: | https://ddd.uab.cat/record/179968 https://dx.doi.org/urn:doi:10.1016/j.atmosenv.2017.06.023 |
| Access Level: | acceso abierto |
| Palabra clave: | Paddy field CH₄ flux N₂O flux Greenhouse gases Elemental stoichiometry Diurnal variation Nitrogen Soil nutrients Phosphorus Seasonal variation Warming |
| Sumario: | Paddy fields are a major global anthropogenic source of greenhouse gases. China has the second largest area under rice cultivation, so determining the relationships between the emission of greenhouse gases and soil carbon content, nutrient availabilities and concentrations and physical properties is crucial for minimizing the climatic impacts of rice agriculture. We examined soil nutrients and other properties, greenhouse-gas production and their relationships in 26 paddy fields throughout the province of Fujian in China, one of the most important provinces for rice production. High P and K concentrations, contents and availabilities were correlated with low rates of CO₂ production, whereas high C and N contents were correlated with high rates of CH₄ production. Mean annual precipitation (MAP) and rates of gas production were not clearly correlated, at least partly due to the management of flooding that can mask the effect of precipitation. Higher mean annual temperatures and soil Fe contents favored the production of N₂O. C, N, P and K concentrations and their ratios, especially the C:K and N:K ratios, and P availability were correlated with CO₂ and CH₄ production across the province, with higher C:K and N:K ratios correlated positively with increased CO₂ production and available P correlated negatively with CH₄ production. A management strategy to avoid excessive C accumulation in the soil and to increase P availability and decrease available Fe contents would likely decrease the production of greenhouse gases. |
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