Of course a continuous submergence positively impacts on methane emission. However aerobic condition favours nitrous oxide emission. .
Rice plants usually transport methane from the anaerobic soil layers through there stem. So if the plant density is higher the transport/emission rates will be also higher
Yes I agree sir. My question is weather root length plays any role in transportation?
Absorption of water and movement of methane is through vascular system is co-related. So it deffinately influence the movement of methane through stem
yes sir off course, Is it root length or biomas plays any role in emission?
Anaerobic decomposition of organic material in flooded rice fields produces methane (CH4). CH4 (a green house gas of global warming potential of 21) is emitted from rice paddies to the atmosphere via three pathways: (a) diffusion, (b) ebullition (bubble) and (c) plant-mediated transport. Most of researchers agreed that more than 90 per cent of total CH4 emit during the cropping season is actually released by diffusive transport through the aerenchyma system of the rice plants and not by diffusion or ebullition.
Methane emission is strongly related to plant growth, the decomposition of soil organic matter and atmospheric conditions. The parameters that affect the emissions of methane from paddy fields include temperature, soil pH, soil organic matter content, the oxidation–reduction (redox) potential and the depth of floodwater.
Research carried out in Taiwan reveals that much of methane is emitted during the effective tillering and booting stages in the first crop season and during the transplanting stage in the second crop season in a year. It is likely that higher plant densities will result in higher transport of methane (but may need an investigation to prove it)!
It may be mentioned here that rainfed rice emits less methane due to periods of droughts whereas upland rice, being never flooded for a significant period of time, is not a significant source of methane. Therefore it may be a good idea to carry out a comparative research of methane emissions (a) in flooded rice fields, (b) rain fed rice fields and (c) upland rice fields (if this is a research project- a merely suggestion only if it is a research project)
Liu, C-W., C-Y Wu 2004. Evaluation of methane emissions from Taiwanese paddies. Science of the Total Environment. 333: 195– 207.
Minami, K. ; Neue, H. 1994. Rice paddies as a methane source. Climatic Change, 27(1): 13-26.
Schütz H., W. Seiler W, and R. Conrad 1989. Processes involved in formation and emission of methane in rice paddies. Biogeochemistry. 7: 33–53
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