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Comparative Study of Radon Concentration in Houses and Soil in Najran Region, Saudi Arabia

材料科学与工程（中英文版） 2011年第1期5卷 76-79页

作者： Saeed hussien mohammed Alyami Abdul-Rahman bin mahdi Secondary School in Riyadh Ministry of Education Riyadh 377035 Saudi Arabia

Indoor radon concentration was measured in Najran region in the south west of Saudi Arabia using CR-39 based radon monitors. The objective of this work, which is the first of its kind in the region, is to get a representative data of radon in four villages, Fara Al-Jabal (1900 m above sea level) and Badr Al-Janoob (2,065 m above sea level), Hadadh (1740 m above sea level) and Al-Khanig (1600 m above sea level) during winter time. Indoor radon concentrations ranged from 9 to 163 Bq·m-3 with an average of 49±14 Bq·m-3. It was also found that the average radon concentration is independent of altitude. The average radon concentrations in soil were also measured at a depth of 50 cm and found to be 1439±207 Bq·m-3 and 2909±421 Bq·m-3 in Fara Al-Jabal and Hadadah respectively. It appears that the houses are well insulated from radon in soil, where there is a potential danger of radon from soil in these villages.

关键词：氡浓度测量沙特阿拉伯土壤房屋潜在危险室内氡海拔平均

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Relationship between Vegetation Height and Species Richness of Birds in Some Wetlands of Sinnar State, Sudan

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Journal of Zoological Research 2020年第4期2卷 14-18页

作者： mohamed Elmekki Ali Elbadawi hussien Department of wildlife Faculty of Natural Resources and Environmental StudiesUniversity of SinnarSudan

Objectives of this study were to: identify the relationship between vegetationhigheit and birds’ species at various wetlands of Sinnar State;This study was conducted in Sinnar state, central Sudan (Latitudes 05º -12º to 05º -14º N and longitudes 32.9º - 35.4º E), covering 12 wetlands(mayas) during the wet and the dry season duration 2011 - 2013;thewetlands are Ronga, Allahmaana, Gladeem, Elban, Rahad Kobri 45,Lawni, Kinnaf Tura 5, Rigaba, Shamiya, Wad elggack, Homrani andSinnar Dam reservoir. The study focused on abundance of herbaceousvegetation, Parameters of herbaceous vegetation were determined at50-m intervals along line transects;these parameters were plant countsand vegetation height in a 1-m circular quadrat. Birds were countedtwice a day (morning and evening) in all wetlands with the help of telescopesand binoculars, and species utilizing each site of the wetlandsare identified. Excel programme was used for data analysis. Vegetationheight is negatively correlated with birds’ species richness in wet seasonsof 2011 - 2012 and 2012 - 2013, positively correlated in the dryseason when herbaceous vegetation is tall, but negatively correlatedwhen it is short.

关键词： Herbaceous Abundance Diversity Richness Heights Wetlands Birds Vegetation

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