rekha nayak

Variation in Sensitivity of Two Economically Important Plants to Thermal Power Plant Emissions, Angul District, Orissa, India

In a study conducted, we evaluated two fruit trees of their responses to emissions from thermal p... more In a study conducted, we evaluated two fruit trees of their responses to emissions from thermal power plants. The study was conducted in all directions within a perimeter of 2.5, 5.0, 10.0 and 15.0 kilometers from thermal power plant. In the study, fluctuations in total chlorophyll, phosphorus, sulphur, total soluble sugars and phenol content in leaves and percentage of leaf damage were studied as response parameters. The resultant data indicates that the degree of response increased with decreasing distance from the source of pollution in relativity to a reference site situated at 15 km. Both the plants exhibited different reactions to the power plant emissions. The sensitivity index calculated was based on the percentage of leaf injury and biochemical parameters. The sensitivity index for Mangifera indica found was 231.3 and that of Sizygium cumini was 250.9. Mangifera indica with a lower sensitivity index was a tolerant species than Sizygium cumini to power plant emissions.

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Biochemical changes in some deciduous tree species around Talcher thermal power station, Odisha, India

PubMed, May 1, 2013

The present study was conducted to evaluate biochemical traits in leaves to assess the air pollut... more The present study was conducted to evaluate biochemical traits in leaves to assess the air pollution impact on plants caused by thermal power plant emissions. Ten species of deciduous trees were selected from study sites in different seasons. pH, chlorophyll, phenols, total soluble sugar content and proline content in fresh leaf was analyzed. The leaf wash pH content reveals moderately acidic (4.5-5.0) to highly acidic (3.5-4.5) range. Significant differences (p < 0.01) were observed in chlorophyll content according to the seasons and sites. Maximum reduction in chlorophyll was noticed at 2.5 km and 5.0 km west from the power plant. Greater reduction in chloropohyll 'b' than chlorophyll 'a' was noticed. An increase in total soluble sugars and phenols was observed at sites closer to thermal power plant in comparison to control. Highest concentration of total phenols was found in summer season in Dalbergia sissoo (1.52%), Butea monosperma (1.12%), Mangifera indica (1.2%), Tectona grandis (1.26%) and Acacia leucophloea (1.16%) at 2.5 km north from the source. Highest concentration of soluble sugar was found in Dalbergia sissoo (7.75%) during winter season. There was about 10-20 fold increase in proline content of leaves in comparison to the control.

Biochemical changes in some deciduous tree species around Talcher thermal power station, Odisha, India

Journal of environmental biology / Academy of Environmental Biology, India, 2013

The present study was conducted to evaluate biochemical traits in leaves to assess the air pollut... more The present study was conducted to evaluate biochemical traits in leaves to assess the air pollution impact on plants caused by thermal power plant emissions. Ten species of deciduous trees were selected from study sites in different seasons. pH, chlorophyll, phenols, total soluble sugar content and proline content in fresh leaf was analyzed. The leaf wash pH content reveals moderately acidic (4.5-5.0) to highly acidic (3.5-4.5) range. Significant differences (p < 0.01) were observed in chlorophyll content according to the seasons and sites. Maximum reduction in chlorophyll was noticed at 2.5 km and 5.0 km west from the power plant. Greater reduction in chloropohyll 'b' than chlorophyll 'a' was noticed. An increase in total soluble sugars and phenols was observed at sites closer to thermal power plant in comparison to control. Highest concentration of total phenols was found in summer season in Dalbergia sissoo (1.52%), Butea monosperma (1.12%), Mangifera indica (...

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