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
Wang, Weiqi (Fujian Normal University. Institute of Geography)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Wang, Chun (Fujian Normal University. Institute of Geography)
Zeng, Congsheng (Fujian Normal University. Institute of Geography)
Tong, Chuan (Fujian Normal University. Institute of Geography)
Asensio, Dolores (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Date:	2017
Abstract:	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.
Grants:	European Commission 610028 Ministerio de Economía y Competitividad CGL2013-48074-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-274
Note:	Altres ajuts: the authors would like to thank Dongping Zeng, Guixiang Chen, Zhen He and Lihong Zhang for their assistance with field sampling. Funding was provided by the National Science Foundation of China (41571287 and 31000209), the Program for Innovative Research Team at Fujian Normal University (IRTL1205), Natural Science Foundation Key Programs of Fujian Province (2018R1101006-1)
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Paddy field ; CH₄ flux ; N₂O flux ; Greenhouse gases ; Elemental stoichiometry ; Diurnal variation ; Nitrogen ; Soil nutrients ; Phosphorus ; Seasonal variation ; Warming
Published in:	Atmospheric environment, Vol. 164, (Sep. 2017) , p. 458-467, ISSN 1352-2310

DOI: 10.1016/j.atmosenv.2017.06.023

Post-print 32 p, 1.5 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
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