As the carbon in the form of methane emits from the soil which reduces the carbon of soil and increases the emission of green house gases. That I want to measure that methane and ammonia liberation from soil from the paddy field.
Sure, why not. There are many research in this regard. You can find almost all on google search.
For analytical methods, start with empirical coefficients from literature. You can get seasonal total g/m2 from several scientific papers and get some consensus value (say mean) for your location. Make sure to analyze this distribution for variance. A good start is https://www.ipcc-nggip.iges.or.jp/public/gl/guidelin/ch4ref5.pdf
You can use values closest to your site from such reports. You can multiply contribution coefficient by area to get a season total. There might be emissions off season from paddy field. You can discount for offseason from seasonal estimates. Remember, these have to be interpreted carefully as they can differ from actual estimates as they are based on best estimates from site studies.
Best wishes.
Thanks Dr Randhir for giving me way to estimate methane emission from paddy field. Thanks@ Dr Khan for sharing a chapter on methane emission estimation it will help me to design a protocol.
Thanks
yes, we need to collect sample from 0.2 m depth in sealed bottles with some HgCl2 in it. We need to do the testing of the gas in the lab by using a gas chromatography. Lot of work has been done in mangrove forest in this regards.
Thanks Dr Rane sir for giving me an idea about methane emission protocol. As you suggest protocol for forest species shall we use same procedure for methane emissions from submerged soil of paddy crop.
Thanks alot for your kind suggestion.
There are many research articles highlighting the method of estimation of methane gas from rice field, please go through the literature as mentioned by the above scientists/ Profs.
Thanks alot Dr Khan and Dr Ghosh sir for giving me an important link for estimating methane emissions from paddy field. Actually I have reviewed so many articles for the estimation but I want to know about titration method. Is there any method to determine CH4 estimation by titration as we do in the CO2 evolution by trapping that CO2 in the NaOH and titrating with the acid.
But thanks for all of your relevant advises and answers. All replies will help me in the estimation of the methane emissions from paddy field.
Dr Sagar, please recall that methane is a saturated organic substance in gaseous form and is the starting compound in homologus series of alkane with negligible reactivity. Methane production is not so large in amount in nature solely due to succession of methanogens such that it could be measured by titrimetrc method. It is measured by sophisticated instrument like GC/HPLC/GC-MS.
Hello Dr. Sagar SUBHASH More
In addition to all the aforementioned highly academically sound replies I would like to add that even in an ecosystem with relatively high anaerobicity there are always methanotrophs present concurrently with the obligate methanogens and it is true for deep sea as well as mangroves as evidenced by 16s and 18s rRNA sequencing. Hence irrespective of the actual amount of methane generated as byproduct by the relevant archea and other prokaryotes, the measured amount is actually only the surplus following oxidation and other catabolisms. With that being said, CH4 being such an effective GHG could be monitored to near cent percent accuracy using precise infrared emitting instrument as methane is an excellent absorbent of long wavelength photon energy such as IR. Many highly expensive portable gas sampling instruments rely on this principle.
With regards,
Dr. Abhishek Mukherjee
I agree with Dr Abhishek Mukherjee for his efficient explanation.
Thanks alot to all of you for giving me an appropriate idea about methane emissions and estimation. All the suggestions will help me during my project.
Actually the methane emissions are very meager as compare to CO2 but the potential of methane for global warming is 25 times than the CO2 so I was interested in reducing the methane emissions.
Thanks once again.
Yeas, we can determine methane emission from rice field by analytical means
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