Measurements and Analysis of Intercepted Precipitation of Silver Birch (Betula pendula Roth.) and Scots Pine (Pinus sylvestris L.) in Urban Area

摘要

Study presents measurements, comparation and analysis of intercepted precipitation ofudconiferous and deciduous trees. Measurements were made on experimental plot in the urbanudpart of the city Ljubljana on two groups of trees: Betula pendula and Pinus sylvestris.udAnalyses and comparations of throughfall and stemflow were made for the period from Juneud2004 till December 2006 which was devided onto four vegetation periods. Rainfall above theudcanopy was measured automatically with a tipping bucket rain gauge with digital recording ofudresults every 10 minutes in combination with manual Helman's rain gauge for control.udThroughfall was measured using a combination of fixed gauges with digital recording ofudresults every 10 minutes and manual roving gauges. Stemflow was measured manually on oneudtree of each specie. The results of the measurements showed that the throughfall for Betulaudpendula was 57-70 % of precipitation and for Pinus sylvestris 35-49 % which is comparableudwith the results of other similar studies around the world. The stemflow fraction for Betulaudpendula amounted 1,1-6,7 % of precipitation and it was practically negligible for Pinusudsylvestris.