Ocenjevanje razlik olistanja dreves s satelitskimi posnetki na območju Lokvice na severnem Krasu

Jelen, Timotej (author), Hladnik, David (mentor)

V letu 2017 so bili satelitski posnetki Sentinel-2 jugozahodne Slovenije primerno brezoblačni, da se je dalo spremljati olistanje dominantnih drevesnih vrst. V okolici Lokvice na Krasu smo z uporabo vegetacijskega indeksa NDVI (Normalized Difference Vegetation Index), določili razlike v olistanju dominantnih drevesnih vrst. Začetek olistanja se je pri večini vrst začel ob istem času v tretji dekadi marca (25. marca). Polno olistanje je bilo najkasneje pri puhastem hrasu (Quercus pubescens Willd.) v drugi dekadi junija (13. junija), najzgodnejše pa pri visokem pajesenu (Ailanthus altissima Mill.) v tretji dekadi aprila (21. aprila). Na vzorčnih ploskvah trajnih travnikov so vidne razlike med travniki, ki so del GERK in travniki, ki niso. Travniki, ki so del GERK, imajo velik padec vrednosti NDVI v juniju, kar je posledica košnje travinja.

• Language: Slovenian
• Keywords: satelitski posnetki, fenologija, severni Kras
• Work type: Bachelor thesis/paper
• Organization: BF - Biotechnical Faculty
• Year: 2018
• PID: 20.500.12556/RUL-103582
• COBISS.SI-ID: 5190566
• Publication date in RUL: 20.09.2018

Secondary language

• Language: English
• Title: Estimation of the leaf-out phenology of trees around lokvica in northern karst region using satellite-based data

Abstract

In the year 2017 the satellite images for the southwest Slovenian area, taken by Sentinel-2, were cloudless enough for research of the leaf-out phenology of local dominant tree species. In the area of northern Karst we were able to use vegetation index NDVI (Normalized Difference Vegetation Index) to determine the difference of leaf-out of dominant tree species. The start of leaf-out was mostly by 25th of March. The full leaf out was longest for downy oak (Quercus pubescens Willd.) by 13th of June and the earliest for the tree of heaven (Ailanthus altissima Mill.) by 21st of April. Examined grasslands that are a part of GERK showed significant differences with those not part of GERK. Grass fields part of GERK had a large drop of values of NDVI during June, which is due to grasslands mowing.

• Keywords: satellite based data, phenology, northern Karst