Evaluación del potencial de la vegetación para retención del polvo sedimentable en la zona urbana de la ciudad de Loja.

This research was carried out with the purpose of evaluating the retention potential of the vegetation and to estimate the concentration levels of sedimentable dust in the urban zone of the city of Loja, by means of the application of two methods Passive Collectors and Passive Biomonitoring, for which 3 transects (North-Central-South) were defined. For the first method, 18 passive collectors were installed and for the second method 173 trees and shrubs were sampled. Three species were studied: Salix humboldtiana Willd (Willow), Fraxinus chinensis Roxb (Fresno) and Hibiscus rosa-sinensis Linneo (King’s Flower) throughout the study area for the period of four months (March-June 2018). For the passive collector method, 18 tubes of 4" in diameter and 20 cm high were used, located at 1,5 m height; and for the passive Biomonitoring method, 30 to 40 grams of leaves were collected. The leaves were washed, the washing water was deposited in petri dishes with previously placed filter paper. In both methods the filter paper was dried in the oven at 70 °C for 24 hours and weighed. The results of the sedimentable dust concentration (PS, for its acronym in Spanish) monitoring were compared with the maximum permissible limits established by the World Health Organization (WHO) and the Unified Text of Secondary Legislation of the Ministry of the Environment (TULSMA) which is 0,5 and 1,0 mg/cm2/30 days. In the case of vegetation, the species with the greatest retention capacity was the King’s Flower with 3114,82 mg/cm2/30 days, due to its higher density of foliage, presence of epidermal trichomes, leaf size and a lower height; and the Willow that caught the least sediment with 293,31 mg/cm2/30 days, because its leaves are thin and smooth and are suspended parallel to the trunk, a position that makes the deposition of sedimentary atmospheric dust more difficult. The sedimentable dust holding capacity varied significantly in both methods, with passive biomonitoring being the most efficient compared to the passive collector method that exhibited little dust retention, because its values are lower than those of the biomonitoring method. Keywords: pollution, sedimentary dust, passive collectors, vegetation and retention.

• Үндсэн зохиолч: Luzuriaga Herrera, Demnis Mishell (author)
• Формат: bachelorThesis
• Хэл сонгох: spa
• Хэвлэсэн: 2019
• Нөхцлүүд: POLVO; CONTAMINACIÓN; VEGETACIÓN
• Онлайн хандалт: http://dspace.unl.edu.ec/jspui/handle/123456789/22048