Tree-rings in Mediterranean pines - can we ascribe them to calendar years?

Balzano, Angela (author), De Micco, Veronica (author), Merela, Maks (author), Čufar, Katarina (author)

A tree ring is defined as a band of xylem-cell layers produced in one year. In Mediterranean trees cambium often produces several bands of alternating early- and latewood during one calendar year, resulting in Intra-Annual Density Fluctuations (IADFs). We present some characteristics of growth layers in Pinus pinea (stone pine) growing on Vesuvius Mountain (near Naples, Italy). The trees showed uninterrupted wood production from January 2015 till the end of January 2016. The ring formed in this period contained five different layers of wood types. Therefore, the wood formed between January and March 2015 would be falsely ascribed to latewood of the tree ring 2014, and the wood formed between March 2015 and the end of January 2016 would be classified as tree ring 2015. We also showed differences in cambium activity in late autumn between years: in November 2015 and 2018 the cambium was still active and not active anymore, respectively. Furthermore, we present the structure of the wood formed in the year 2017 affected by a wildfire in July. Such cases where the growth layer cannot be exactly ascribed to a calendar year should be considered in dendrochronological studies of Pinus pinea and other Mediterranean species.

• Language: English
• Keywords: ree ring boundary, tree ring, Pinus pinea, earlywood, latewood, intra-annual density fluctuation, xylogenesis, Italy
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2019
• Number of pages: Str. 5-14
• Numbering: Letn. 68, št. 1
• PID: 20.500.12556/RUL-126637
• UDC: 630*811.49:630*174.7 Pinus pinea
• ISSN on article: 0024-1067
• DOI: 10.26614/les-wood.2019.v68n01a01
• COBISS.SI-ID: 3084169
• Publication date in RUL: 29.04.2021

Record is a part of a journal

• Title: Les
• Shortened title: Les
• Publisher: Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Biotehniška fakulteta, Oddelek za lesarstvo, Založba Univerze, Biotehniška fakulteta, Oddelek za lesarstvo, Založba Univerze
• ISSN: 0024-1067
• COBISS.SI-ID: 13940224

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 29.04.2021

Secondary language

• Language: Slovenian
• Title: Prirastne plasti v mediteranskih borih - ali lahko ugotovimo, v katerem koledarskem letu so nastale?

Abstract

Branika v lesu je plast ksilemskih celic, nastalih v enem letu. V drevesih, rastočih v Sredozemlju, kambij pogosto proizvede več plasti ranega in kasnega lesa v enem koledarskem letu in prirastna plast posledično vsebuje gostotne variacije (IADF). Predstavljamo nekatere značilnosti prirastnih plasti lesa pinij (Pinus pinea), s pobočij Vezuva pri Neaplju v Italiji. Drevesa so od januarja 2015 do konca januarja 2016 izkazovala neprekinjeno nastajanje lesa. Les, ki je nastal v tem obdobju, je vseboval pet različnih slojev. Les, nastal med marcem 2015 in koncem januarja 2016 bi opredelili kot braniko 2015, les, ki je nastal med januarjem in marcem 2015, pa bi zmotno prišteli kasnemu lesu branike 2014. Prikazali smo tudi razlike v delovanju kambija v pozni jeseni; novembra 2015 je bil kambij še aktiven in je proizvajal les, novembra 2018 pa se je aktivnost že zaključila. Predstavljamo tudi zgradbo lesa, nastalega v letu 2017, ko je drevesa v juliju prizadel gozdni požar. Primere, ko rastne plasti ni mogoče natančno pripisati koledarskemu letu, je treba upoštevati v dendrokronoloških raziskavah pinije in drugih sredozemskih drevesnih vrst.

• Keywords: rani les, kasni les, branike, letnice, pinja, traheide, gostotna variacija v prirastni plasti, ksilogeneza, Italija

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P4-0015
• Name: Les in lignocelulozni kompoziti