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Emission fluxes of nitrous oxide, carbon dioxide, and dimethyl sulfide from various vegetation areas

หน่วยงาน จุฬาลงกรณ์มหาวิทยาลัย

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ชื่อเรื่อง : Emission fluxes of nitrous oxide, carbon dioxide, and dimethyl sulfide from various vegetation areas
นักวิจัย : Kunawut Boonyanopakun
คำค้น : Nitrous oxide , Carbon dioxide , Dimethyl sulfide
หน่วยงาน : จุฬาลงกรณ์มหาวิทยาลัย
ผู้ร่วมงาน : Prasert Pavasant , Chulalongkorn University. Faculty of Engineering
ปีพิมพ์ : 2545
อ้างอิง : 9741715595 , http://cuir.car.chula.ac.th/handle/123456789/1404
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Thesis (M.Eng.)--Chulalongkorn University, 2002

The aim of this work was to measure the emission fluxes of three vital gaseous pollutants affecting the atmosphere, i.e. nitrous oxide (N[subscript 2]O), cabon dioxide (CO[subscript2]), and dimethyl sulfide (DMS) by using the chamber technique. Both agricultural fields (corn, wheat, and soyabean) and pine forest in Japan were selected as a model study and the results showed that agricultural fields played a significant role as the emission sources of N[subscript 2]O and CO[subscript 2]. However, there was still not enough evidence at this point to conclude that turning the forest to agricultural field would affect the emission flux of DMS. In addition, it was found that there were some significant factors affecting the emission rates of the pollutants. Firstly, temperature was found to stimulate the mechanism of CO[subscript 2] production in all investigated vegetation areas. On the other hand, there was only a slight effect of temperature on N[subscript 2]O where N[subscript 2]O flux was observed to increase with temperature in the pine forest at low temperature range (10-20 ํC). Secondly, the application of manure in agricultural field intensified both N[subscript 2]O and CO[subscript 2] emissions. Further investigation on the effect of high dose of chemical fertilizer applied in bared soil showed that ammonia could exhibit inhibition effect to the microbial activities of N[subscript 2]O production. Tillage practice was also found to exert influential effect on N[subscript 2]O and CO[subscript 2] fluxes. This work found that soil in the no-tillage plot was depleted in oxygen and led to a high emission of N[subscript 2]O whereas the tilled soil resulted in the highest emission of CO[subscript 2] compared to other plots. Although all parameters investigated in this work seldom affected DMS emission, there seemed to be a relationship between the generation mechanisms of DMS and N[subscript 2]O both in the wheat field and pine forest.

บรรณานุกรม :
Kunawut Boonyanopakun . (2545). Emission fluxes of nitrous oxide, carbon dioxide, and dimethyl sulfide from various vegetation areas.
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Kunawut Boonyanopakun . 2545. "Emission fluxes of nitrous oxide, carbon dioxide, and dimethyl sulfide from various vegetation areas".
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Kunawut Boonyanopakun . "Emission fluxes of nitrous oxide, carbon dioxide, and dimethyl sulfide from various vegetation areas."
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย, 2545. Print.
Kunawut Boonyanopakun . Emission fluxes of nitrous oxide, carbon dioxide, and dimethyl sulfide from various vegetation areas. กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย; 2545.