Sanacija vetrolomne površine na Jelovici : diplomsko delo - univerzitetni študij

Ščap, Špela (author), Bončina, Andrej (mentor)

Leta 2006 je orkan porušil 125 hektarjev enomernih smrekovih debeljakov na planoti Jelovica (GGE Jelovica, GGO Bled). Raziskava naj bi pokazala: 1) uspešnost naravne obnove na vetrolomni površini in 2) vpliv izbranih rastiščnih in sestojnih dejavnikov na pojavnost in gostoto pomladka drevesnih vrst. Na terenu je bila zakoličena mreža 81 stalnih vzorčnih ploskev (4 x 4 m)z gostoto 100 x 200 m, na katerih so bile opisane rastiščne in sestojne razmere ter analizirano število, sestava in višinska struktura pomladka (dbh <10 cm), dodatno pa je bila analizirana prisotnost dreves. Pojavnost pomladka je bila analizirana z binarno logistično regresijo, obilje pa s posplošenim linearnim regresijskim modelom. Kar 30 % ploskev je bilo brez pomladka. Povprečna gostota pomladka je bila 7955 osebkov na hektar, 76 % celotnega števila pa je predstavljala smreka. Ugotovljen je bil vpliv številnih rastiščnih in sestojnih dejavnikov na pojavnost in obilje pomladka, vendar so se smeri in jakost vpliva posameznega dejavnika v modelih za različne drevesne vrste razlikovale. Med rastiščnimi dejavniki količina opada listja inobilje zeliščne ter grmovne plasti pozitivno vplivata tako na pojavnost kot na obilje pomladka. Med sestojnimi parametri razdalja ploskve do najbližje zaplate gozda negativno vpliva na obilje pomladka večine drevesnih vrst, medtem ko delež listavcev v lesni zalogi negativno vpliva tako na pojavnost kot na obilje pomladka.

• Language: Slovenian
• Keywords: vetrolomi, motnje, sanacija, naravna obnova, vplivni dejavniki, smreka, Picea abies, Alpe
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [Š. Ščap]
• Year: 2010
• Number of pages: VIII, 44 f.
• PID: 20.500.12556/RUL-17754
• UDC: 630*23(043.2)=163.6
• COBISS.SI-ID: 3057062
• Publication date in RUL: 11.07.2014

Secondary language

• Language: Unknown

Abstract

In 2006 a hurricane blew down 125 hectares of even-aged Norway spruce-dominated forest stands on the Jelovica plateau (FMU Jelovica, FMR Bled). Study should examine: 1) the efficiency of the natural regeneration on the blowdown area and 2) the influence of selected site and forest stand factors on the occurence and abundance of tree species regeneration (dbh < 10 cm). The grid (100 * 200 m) of 81 permanent sampling plots (4 * 4 m) was established, on which some site and stand parameters were evaluated and number, composition and height structure of the regeneration were analysed. The occurence of the regeneration was studied by binary logistic regression, while the abundance of the regeneration was examined using generalized linear model. 30 % of the plots were registered with no regeneration. The average regeneration density was 7,955 trees per hectare with Norway spruce representing 76 %. Several site and forest stand factors significantly influenced the occurence and abundance of the regeneration, however the influences of the same predictors differed between the models for different tree species regeneration. Among site characteristics, the amount of leaf-litterfall and cover of herbaceous and shrub layers had the most significant positive impacts on both the occurence and abundance of the regeneration of all tree species. Among forest stand characteristics, the distance to the nearest forest stand patch had the largest negative influence on the abundance of the regeneration, while the proportion of broadleaves had negative influence on the occurence and abundance of the regeneration.