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Vpliv mikrostrukture padavin in indeksa listne površine na prestrezanje padavin
Novak, Barbara (Author), Šraj, Mojca (Mentor) More about this mentor... This link opens in a new window, Zabret, Katarina (Co-mentor)

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Abstract
Prestrežene padavine so padavine, ki jih vegetacija zadrži med padavinskim dogodkom in nato izhlapijo nazaj v ozračje. Količina prestreženih padavin je odvisna od različnih vegetacijskih in meteoroloških dejavnikov, v tem magistrskem delu pa smo se poglobili v dva redkeje obravnavana dejavnika in sicer indeks listne površine (LAI) in mikrostrukturo padavin. Meritve smo izvajali na raziskovalni ploskvi ob stavbi Oddelka za okoljsko gradbeništvo UL FGG v centru Ljubljane, kjer sta dve skupini dreves: dve navadni brezi (Betula pendula Roth.) in dva črna bora (Pinus nigra Arnold). Meritve padavin, prepuščenih padavin in odtoka po deblu smo izvajali med avgustom 2015 in junijem 2016, hkrati pa smo merili tudi mikrostrukturo padavin z disdometrom. Spomladi 2016 smo začeli izvajati tudi meritve indeksa listne površine (LAI) za obe vrsti dreves. Povečanje LAI je zelo opazno pri brezi, saj smo opazovali rast novih listov, indeks se je v kratkem obdobju povečal iz 1 na 2,5. Pri boru pa spremembe niso bile tako očitne, vrednosti so med 1,5 in 2,2. Rezultati so pokazali, da je breza v obravnavanemu obdobju prestregla 19,2 % vseh padavin, bor pa 38,2 % vseh padavin. Na prestrezanje najbolj vpliva skupna količina padavin, vendar je za dogodke z isto količino padavin delež prestreženih padavin lahko različen zaradi mikrostrukture padavin (velikost in hitrost kapljic) in LAI ter s tem povezane skladiščne zmogljivost krošnje. Drevesa prestrežejo več, ko so kapljice manjše in počasnejše ter ko ima drevo visok LAI.

Language:Slovenian
Keywords:mikrostruktura padavin, indeks listne površine (LAI), prestrezanje padavin, breza (Betula pendula Roth.), bor (Pinus nigra Arnold)
Work type:Master's thesis/paper (mb22)
Tipology:2.09 - Master's Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2017
Publisher:[B. Novak]
UDC:556.12:581.45(043.3)
COBISS.SI-ID:8065121 Link is opened in a new window
Views:727
Downloads:318
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Secondary language

Language:English
Title:Effect of precipitation microstructure and leaf area index on the interception of precipitation
Abstract:
Rainfall interception loss is rainfall retained by vegetation during rainfall event which then evaporated back into the atmosphere. Quantity of interception loss depends on a variety of vegetation and meteorological factors. In this thesis we deepen the knowledge of two rarely addressed factors, leaf area index (LAI) and microstructure of rainfall. Measurements were carried out at the research plot adjacent to the building of the Department of Environmental Civil Engineering UL FGG in the center of Ljubljana, where grown two groups of trees: two silver birch (Betula pendula Roth.) and two black pine (Pinus nigra Arnold). The measurements of precipitation, throughfall and stemflow were carried out between August 2015 and June 2016, at the same time, we also measured the microstructure precipitation with disdometer. In the spring of 2016 we started with the measurements of leaf area index (LAI) for both considered tree species. LAI increase is very noticeable by the birch, which is the consequance of the growth of new leaves in spring. Within a short time period LAI increased from 1 to 2,5. In the case of pine, the changes are not so obvious, values of LAI are between 1,5 and 2,2. The results show that in the observed period birch intercepted 19,2 % and pine 38,2 % of total rainfall. The interception was most affected by the total amount of precipitation, however the differences in the proportion of interception with the same amount of precipitation were due to the microstructure of precipitation (size and speed of the droplets) and LAI, related to the storage capacity of the tree crown. Trees intercept more when the droplets are smaller and slower, and LAI higher.

Keywords:the precipitation microstructure, leaf area index (LAI), interception loss, birch (Betula pendula Roth.), pine (Pinus nigra Arnold)

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