Methane Emission Pattern of Indian Rice-Ecosystems |
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| Authors: | K R Manjunath Sushma Panigrahy T K Adhya V Beri K V Rao J S Parihar |
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| Institution: | (1) Space Applications Centre, ISRO, Ahmedabad, 380015, India;(2) Central Rice Research Institute, ICAR, Cuttack, India;(3) Punjab Agricultural University, Ludhiana, India;(4) Directorate of Rice Research, ICAR, Hyderabad, India |
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| Abstract: | The rice land is linked to the climate change due to its methane emission potential. The systems of growing rice and associated
soil and crop management practices that have evolved are varied and complex. However, from the methane emission point of view,
water regime is a crucial parameter. According to IPCC guidelines the rice ecosystem need to be categorized into four strata
for methane emission study. The remote sensing based stratification map previously developed was used for in-situ weekly/monthly
measurements of methane emission from the representative ecosystems, samples were collected and analysed using gas chromatography
following the IPCC standards for three consecutive years; 2003, 2004 and 2005. This paper highlights the results of methane
emission measurement and pattern from rice lands of India based on in-situ measurements. The CH4 emission pattern of irrigated crop in dry season showed a steady increase in the beginning which peaks during flowering stage,
decreasing gradually thereafter. The results were consistent for different varieties and across the years. The emission pattern
of irrigated wet season crop showed two peaks. The emission pattern also showed the influence of crop variety as well as year
(of observation). The mean emission coefficient derived from all categories and all samples (n = 471) weighted for the Indian rice crop was 74.05 + 43.28 kg/ha. |
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