METHANE EMISSIONS FROM WATER-HYACINTH-INFESTED FRESH-WATER ECOSYSTEMS

Authors
Citation
A. Banik et al., METHANE EMISSIONS FROM WATER-HYACINTH-INFESTED FRESH-WATER ECOSYSTEMS, Chemosphere, 27(8), 1993, pp. 1539-1552
Citations number
18
Categorie Soggetti
Environmental Sciences
Journal title
ISSN journal
00456535
Volume
27
Issue
8
Year of publication
1993
Pages
1539 - 1552
Database
ISI
SICI code
0045-6535(1993)27:8<1539:MEFWFE>2.0.ZU;2-U
Abstract
Methane emission from waterhyacinth was studied under natural, laborat ory and greenhouse conditions. The emission rate varied between 6 and 326 mg m-2 h-1; methane dissolved in surface water (11-61 mug l-1) was taken up by the plant and eliminated through the plant's ventilating system largely through the leaves. Although methane emission increased with increase in the content of dissolved methane, wind velocity, pla nt surface area and light intensity, there was no proportionality betw een methane emission and these factors. Methane emission was reduced a bout 70% in darkness. The optimum pH and soil temperature for methane production by methanogens was 33-degrees-C. Leaf tissues were most eff iciently utilized by soil microorganisms for methane production. It ha s been estimated that in India alone 1.2 Tg of methane are emitted per year.