Naslov
GROWTH DINAMICS OF PEDUNCULATE OAK INFLUENCED BY SPREADING OF OAK LACE BUG IN REPUBLIC OF CROATIA

Autori
Goršić, Ernest ; Božić, Mario ; Bazijanec, Ivan ; Klem, Marko ; Franjević, Milivoj ; Kolar, Antonija

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Natural resources, green technology & sustainable development / Redovniković, Ivana R. ; Jakovljević, Tamara ; Stojaković, Renata ; Erdec, Dina ; Damjanović, Anja - Zagreb : Prehrambeno-biotehnološki fakultet Sveučilišta u Zagrebu, 2022, 38-38

Skup
4th Natural resources, green technology and sustainable development/4 (GREEN2022)

Mjesto i datum
Zagreb, Hrvatska, 14.09.2022. - 16.09.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
climate ; oak lace bug spread ; pedunculate oak ; radial growth ; tree ring

Sažetak
Oak lace bug Corythucha arcuata (Say, 1832) was first recorded in 2013 in eastern Slavonia and until now it has spread along the whole lowland pedunculate oak forests distribution range in Croatia. The aim of this research was to determine influence of C. arcuata infestation and compare trends in radial growth of pedunculate oak trees in the period before and after oak lace bug appearance in old stands distributed along Sava river and its confluents. For this research five pedunculate oakhornbeam (Carpino betuli-Quercetum roboris) stands within age class of 120-140 years were chosen within regional forest offices Lipovac, Cerna, Lipovljani, Veliki Grđevac and Karlovac. In all stands sampling was conducted on 15 visually healthy pedunculate oak trees belonging to dominant or codominant tree layer to minimize influence of competition. Two core samples per tree were taken at the breast height using Pressler increment borers and tree ring width in the period from 2000 to 2019 was measured. It was expected that radial growth will steadily decrease in all sampled stands after occurrence of C. arcuata infestation thus making possible to track spatial spreading of the insect. Results only partially correspond to the expectations. Expected average growth trend reduction in analysed stands is not clearly visible before year 2017 despite presence of C. arcuata in some of them. In the year 2017, radial increment started to decline in all analysed stands. Growth reduction was on average 19, 78% in relation to average growth rate prior to this period. In the period before 2017 trees show normal growth response mostly related to various stand conditions. High radial increment in 2013 and 2016 was observed in most stands and is related to favourable climate conditions. Since meteorological factors, especially air temperature and precipitation, are decisive in the insect biology (influencing metabolic activity, abundance rate, and dispersion), an explanation could be that C. arcuata prefers or performs better in certain conditions (high temperatures, low humidity) and also feeds on leaves that grow under low or no water deficit. Based on the obtained results it is obvious that the effect of C. arcuata on reduction of radial growth of adult pedunculate oak trees is present but it is tied to complex relations of insect and plant biology in relation to climate. Further, longer period of systematic monitoring of the oak lace bug population, radial growth of pedunculate oak trees and climate is required.

Izvorni jezik
Engleski

Znanstvena područja
Šumarstvo, Biotehnologija

POVEZANOST RADA