Salinity and organic amendment effects on methane emission from a rain-fed saline paddy field(Fertilizers and Soil Amendments)

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概要

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• Organic amendment is a traditional practice for rehabilitating saline patches in north-east Thailand, but organic matter is known to enhance methane emission. However, a high degree of salinity might mitigate methane emission. The objective of the present study was to quantify the effects of salinity and organic amendments on methane emission from rain-fed paddy fields exposed to increasing salinity. A paddy field on a salt-affected Typic Natraqualfs was selected. Eighteen experimental plots were located in two randomized complete block designs placed inside and outside a saline patch. Each design of nine plots presented three replicates of two different organic amendments and a control treatment without organic amendment. During the rainy season the soil electrical conductivity, measured with an electromagnetic conductivity meter (EC_<EM>), was greater than 300mS m^<-1> inside the saline patch, whereas outside the saline patch the values were lower than 200mS m^<-1>. Rice straw (6.25t ha^<-1>) and cow manure (8.99t ha^<-1>), representing similar amounts of carbon, were incorporated. Methane emission from the soil, EC_<1:5> and soil redox potential (Eh) were monitored during the rice-growing season. High methane emission was mostly associated with low Eh, 48% of the Eh measurements were between -100mV and -200mV. In the saline patch, the average methane emission ranged from 251 to 334mg CH_4 m^<-2> day^<-1>; outside the saline patch the values had a wider range from 209 to 544mg CH_4 m^<-2> day^<-1>. The addition of rice straw or cow manure significantly enhanced methane emission by an approximate factor of 2.5 outside the saline patch, but did not significantly increase methane emission inside the saline patch. The attenuating effect of salinity on methane emission was particularly strong at the beginning of flooding during the first 20 days after transplanting and at the end of flooding (from 54 days after transplanting). When applied to saline patches, organic amendment did not significantly enhance methane emission in the first year.

著者

• SUPPARATTANAPAN Sakulrat

  Land Development Department, Region 5 Office

• SAENJAN Patcharee

  Department of Plant Science and Agricultural Resources, Faculty of Agriculture, Khon Kaen University

• QUANTIN Cecile

  UMR 8148 IDES, University Paris Sud

• MAEGHT Jean

  Institut de Recherche pour le Developpement

• GRUNBERGER Olivier

  Institut de Recherche pour le Developpement

• Quantin Cecile

  Umr 8148 Ides University Paris Sud

• Saenjan Patcharee

  Department Of Plant Science And Agricultural Resources Faculty Of Agriculture Khon Kaen University

• Supparattanapan Sakulrat

  Land Development Department Region 5 Office

関連論文

• Salinity and organic amendment effects on methane emission from a rain-fed saline paddy field(Fertilizers and Soil Amendments)

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