http://dr.lib.sjp.ac.lk/handle/123456789/10541 2026-01-07T04:02:33Z 2026-01-07T04:02:33Z Bandara, W.A.R.T.W. Udadini, K.M.E. http://dr.lib.sjp.ac.lk/handle/123456789/10613 2022-03-16T04:43:36Z 2018-01-01T00:00:00Z

Community and Industry Attitude Towardsusing Invasive Prosopisjulifloraas a Dry Matter Energy Sourcefor Small Scale Industries: A Case Study in Hambantota, Sri Lanka Bandara, W.A.R.T.W.; Udadini, K.M.E. Bundala is Sri Lanka’s first RAMSAR wetland declared under Ramsar Convention, and it has been declared as a national park in 1993 under Fauna and Flora Protection ordinance.At present, wide spread of P.juliflora in the Bundala National Park area has become a threat to diverse ecosystems, and the park management is removing substantial biomass of P. juliflora each year in an attempt to control this invasive species. As such, investigating the potential to utilize the removed biomass of P.juliflora has become important. This study was conducted with the objective of evaluating community and industry attitude and awareness of using P.juliflora as a dry matter energy source in Hambantota District. Two different questionnaires were used for two groups after pre testing in Ambalantota, Hambantota and Tissamaharama Divisional Secretariat Divisions. According to study findings, subsistence energy needs of community are basically fulfilled by common fuel wood species in the area such as Manilkarahexandra and Drypetessepiara. Community in the area is aware about the fast spread of P. juliflora over native species. Approximately 45% of study respondents represent brick industry and they often use rice husk ovens due to lack of firewood to be found in the area and the high availability of rice husk. Since industry and community prefer P.juliflora as a fuel, responsible agencies should make appropriate arrangements to harvest, process and make available the biomass to partially fulfill the thermal energy requirement in the area.

2018-01-01T00:00:00Z Gamage, S.S.N. Ratnayake, R.M.T.S. Senadhira, A.M.A.D.M. http://dr.lib.sjp.ac.lk/handle/123456789/10612 2022-03-16T04:34:30Z 2018-01-01T00:00:00Z

Radioactive and Non-Radioactive Element Analysis of Dorado Gas Discovery of Sri Lanka and Their Influence on Natural Environment Gamage, S.S.N.; Ratnayake, R.M.T.S.; Senadhira, A.M.A.D.M. Naturally-occurring radionuclides deposited beneath the earth, which are referred to as "NORM" and other toxicnon-radioactive elements transported to the earth surface with the oil and gas production. Hence, knowledge of the prevailing background levels of these elements in the subsurface reservoir formations is valuable to all stakeholders, most notably to regulatory authorities of the country. The drill cuttings obtained within depth range 3025m to 3095m of reservoir sand section in the deep water exploratory well (CLPL- Dorado 91 H/1z) drilled in the Mannar Basin offshore Sri Lanka were subjected to high-resolution Gamma-ray spectrometry and X-ray fluorescence (XRF) spectrometry. As test results revealed activity concentration of 40K varies from 0.338 Bq/g to 0.514 Bq/g, 210Pb from 0.007 Bq/g to 0.015 Bq/g, 226Ra from 0.012 Bq/g to 0.0145 Bq/g while 232Th levels are between 0.030 Bq/g to 0.040 Bq/g. According to the XRF testing levels of significantly hazardous non-radioactive elements are considerably lower, except for the level of the Barium. The Pb level varies between the 48 ppm to 22 ppm. The Thorium level varies between 9.6 ppm to 10.1 ppm. Manganese has a range of 5,173ppm to 653ppm.The barium levels are between 118,666 ppm to 24,400 ppm. NORM concentration of the tested section were on the lower side when results matched with the IAEA published data on NORM concentration in oil, gas and there byproducts and therefore there will be low level of NORM contaminations when the Dorado gas discovery proceeds to the production stage. Further there is no harmful public exposure from NORM by disposing these drill cuttings to environment or storing at any site location. But the disposal of the drilling mud and handling of the drilling mud should be conducted with cautious since extremely high Ba levels can potentially cause health problems.

2018-01-01T00:00:00Z Arunkumar, A.N. Chauhan, S. http://dr.lib.sjp.ac.lk/handle/123456789/10611 2022-03-16T04:25:03Z 2018-01-01T00:00:00Z

Assessment of Root Plate Structure in Wind-Thrown Trees of Melia dubia Arunkumar, A.N.; Chauhan, S. Root plays a significant role in tree growth and development and information pertaining to spread of the root and its depth will be useful for establishing plantations. Most of the root studies are generally carried out in trees growing in urban areas in avenues, but limited studies are carried out in plantations. Being an underground part of the tree, there are inherent difficulties in understanding root architecture. Uprooting of trees due to storm or wind damage provides an ideal opportunity to obtain critical understanding about tree roots. Such study has been carried out in an 11 year old storm ravaged Melia dubia plantation in Punjab, India. Field observations such as tree girth, root girth, root plate width and depth was recorded on uprooted trees. A large variability was recorded for all the traits. Root plate width and depth ranged from 1.42 to 5.17 m and 0.75 to 2.50 m, respectively. A strong positive relationship between tree girth and primary root girth, root plate width and depth identified in this study provides base line information which can be used while establishing M. dubia plantations.

2018-01-01T00:00:00Z Chandrasiri, P.H.S.P. Dharmarathne, W.D.S.C. Mahaulpatha, W.A.D. http://dr.lib.sjp.ac.lk/handle/123456789/10610 2022-03-16T04:03:37Z 2018-01-01T00:00:00Z

Diversity and Distribution of Avifauna at the Tropical Montane Cloud Forests of Horton Plains National Park Chandrasiri, P.H.S.P.; Dharmarathne, W.D.S.C.; Mahaulpatha, W.A.D. Diversity and distribution of avifauna was studied at the tropical montane cloud forests of Horton Plains National Park, situated in the highland plateau of the Nuwara Eliya district from September 2015 to May 2016. Three main habitats were identified; cloud forest habitat, cloud forest die-back habitat and grassland habitat. Nine, 300 m line transects were marked in each of the habitats. Avifauna was recorded on three consecutive days of each month while travelling along these transects. Seventy eight species of birds were recorded during the study period. This included 66 resident species (with 13 endemic species) and 12 migratory species. The maximum value of the Shannon Wiener Index H' of 2.56 was recorded from the cloud forest habitat. In the cloud forest die-back habitat the H' was 2.49 and in the grassland habitat the H' was 2.31.The Jaccard similarity index, between cloud forest and cloud forest die-back was 0.58, and these two habitats had more common species. Cloud forest is the major habitat to be protected, with other habitats, in HPNP. Hence management of the HPNP should plan more actions to improve long term monitoring plans to warrant the protection of threatened species.

2018-01-01T00:00:00Z