http://dr.lib.sjp.ac.lk/handle/123456789/10544 2026-01-07T04:25:24Z http://dr.lib.sjp.ac.lk/handle/123456789/10664 Challenges of Biopiracy: Implementing Community Based Ecotourism (CBET) in the Sri Lankan context Kumara, H.I.G.C. 2016-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/10661 Assessment of Genetic Diversity of Some Finger Millet (Eleusine coracana (L.) Gaertn. Accessions Using Morphological Markers Kaluthanthri, D.V.S.; Dasanayaka, P.N. Germplasm characterization is an important link between conservation and utilization of plant genetic resources. The study was conducted to characterize randomly selected 20 finger millet germplasm accessions obtained from Plant Genetic Resource Center, Gannoruwa, Sri Lanka using morphological markers. Morphological study was carried out using Randomized Complete Block Design (RCBD) and 15 morphological markers were recorded. Analysis of variance (ANOVA) results for quantitative morphological characters revealed that all quantitative morphological characters measured differed significantly (p˂0.05) among the accessions used for the study, indicating higher levels of morphological diversity. According to the ANOVA results, days to flowering and days to maturity show high level of predictive capability while flag leaf length and number of productive tillers show comparatively low level of predictive capability. Principal component analysis indicated that morphological characters such as days to flowering, finger number and yield per plant were the important traits contributing for the overall variability implying that breeding effort on those traits can meet the targeted objective. The clustering pattern of studied finger millet accessions based on morphological markers comprised of two major clusters. Both clusters comprised of Indian accessions those conserved at PGRC, Gannoruwa and as well as Sri Lankan accessions. Results of the study suggest a considerable morphological variability, which could exist among the studied traits. Furthermore, this study revealed that the genetic diversity existed irrespective to the geographical origin. This finding justifies the importance of germplasm characterization. 2016-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/10659 Geo-informatics Techniques for Assessing Physiological Status and Productivity of RRIC 121 Genotype of Hevea brasiliensis (Rubber) under Different Harvesting Systems Fernando, K.M.E.P.; Premasiri, H.M.R.; Kudaligama, K.V.V.S. Rubber (Hevea brasiliensis) one of the main plantation crops in Sri Lanka is the only plant species cultivated commercially for natural rubber harvesting. Novel systems for harvesting have been introduced but spatial distribution of photosynthetic potential determining key factor for sustainable cultivation has not been properly explored. Use of such techniques such as Satellite Remote Sensing (RS) and Geographic Information System (GIS) to analyse spatial and biological factors related to the productivity of rubber plantation with different harvesting systems is the main objective of the present study. Quikebird high resolution satellite images were used for RS analysis. Chlorophyll content of rubber leaves was measured using a SPAD-502 chlorophyll meter. Chlorophyll content and satellite images were analysed using GIS and spatial statistical methods to determine the variation in different harvesting systems. Yield data were collected from the study site and yield parameters were correlated with chlorophyll content and Normalized Difference Vegetation Index (NDVI) values. Results revealed all systems exhibited promising yield performance without significant deviation but slightly higher yield per hectare per year (YPH) and dry rubber content of latex (DRC) were recorded in quarter spiral based once in three days (S/3 d4) and weekly (S/2 d1 2d7) harvesting systems. Chlorophyll content and rubber yield showed direct correlation in all systems. NDVI vs chlorophyll showed positive correlation r2=0.65 and spatial distribution of chlorophyll and NDVI values demonstrated sound physiological status of plants across the plantation with different harvesting systems. Cost effective LIH systems showed better production trend demonstrating relatively higher yield while reducing tapping cost and labour. Satellite based remote sensing technique is an easy and efficient tool to estimate productivity of rubber plantation over a large area. 2016-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/10658 Social Geology and Landslide Disaster Risk Reduction in Sri Lanka Jayasingha, P. Landslide disaster risk reduction is presently a challenging task facing by Sri Lankan geologists. Increasing trend of population growth in Sri Lanka has adversely affected the stability of central highland due to various human activities. Among them establishment of human settlements and change in land use pattern have become a serious issue in triggering land instabilities in central highland of the country. National Building Research Oragnisation which is the main focal point in land slide disaster risk reduction in Sri Lanka has taken valuable and timely needed actions including preparation of landslide hazard zonation maps, early warnings and mitigations. Though the landslide is a geological phenomenon, it is highly interacted with human societies. Hence managing the issues arising with the landslide occurrence should be addressed with a sociological approach. This new approach is known as Socio Geological approach which is discussed here. 2016-01-01T00:00:00Z