期刊名称：Journal of Environmental Science and Natural Resources
印刷版ISSN：2408-8633
出版年度：2013
卷号：6
期号：1
页码：253-259
DOI：10.3329/jesnr.v6i1.22075
语种：English
出版社：Bangladesh Society for Conservation of Environment and Natural Resources
摘要：The experiment was conducted to carry out the nitrogen fixing cyanobacterial (BGA) resources and their distribution pattern in rice fields of North-West region of Bangladesh during the period of 2011. Considering the vast importance of Blue-green algae (BGA) in agricultural land especially in rice fields, their twelve months long systematic was undertaken. A total of 10 genera with 37 species of filamentous-heterocystous blue-green algal forms were identified and recorded from this region. Out of 37 species, 9 species belonging to the genus Anabaena, 8 to Nostoc, 5 to Cylindrospermum, 4 to Calothrix, 3 to Rivularia, 3 to Gloeotrichia and 2 to Aulosira; while 1 species belonging to each genus of Anabaenopsis, Microcheate and Aphanizomenon. The distribution pattern of filamentous-heterocystous BGA in rice fields over the study area has also been observed in this study. With few exceptions, the filamentous-heterocystous BGA are more or less uniformly distributed all over the study areas. All of the BGA members have a tremendous ability to contribute on enhancing agricultural production by fixing atmospheric nitrogen and adding organic matter, vitamins, growth promoting substances etc to the soil and crops.DOI: http://dx.doi.org/10.3329/jesnr.v6i1.22075 J. Environ. Sci. & Natusral Resources, 6(1): 253-259 2013
