Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Geochronometria

2 2023

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

δ13C and Intrinsic Water Use Efficiency for Trees in Various Health Conditions – Case Study for Świerklaniec Forest District Forest District

Benisiewicz Barbara, Pawełczyk Sławomira, Kłusek Marzena

Geochronometria

2023

Vol. 50, no. 1

125--134

The study included a comparative analysis of two Pinus sylvestris L. trees growing next to each other, but in a different health condition, and the reference trees growing in the same area in Poland. The declining tree, although it was a more difficult research material, was subjected to the same analyses as healthy trees, including: creating a ring width index (RWI) record, a δ13C record, an intrinsic water use efficiency (iWUE) record and checking for the following correlations: δ13C-temperature, δ13C-precipitation, δ13C-SO2, and iWUE-SO2. Our study found that trees with different health conditions may have comparable growth patterns, but different carbon isotopic compositions and iWUE. Differences between individual trees were also observed in sensitivity to changes in temperature and SO2 emissions. The declining tree showed more significant correlations with summer temperatures, than the healthy tree and the reference trees, where significant correlations occurred in single months. Only in the instance of the declining tree, correlations were found between δ13C and SO2. iWUE of all trees did not show sensitivity to SO2 emitted in high concentrations; however, we observed the sensitivity of iWUE from the reference trees to low SO2 concentrations.

Investigation of Trees' Sensitivity to Drought: A Case Study in the Opole Region, Poland

Benisiewicz Barbara, Pawełczyk Sławomira, Niccoli Francesco, Kabala Jerzy Piotr, Battipaglia Giovanna

Geochronometria

2023

Vol. 50, no. 1

135--143

Pinus sylvestris L. is the most common tree species growing in Poland. Trees of this species are considered to be resistant to difficult meteorological conditions; however, in the past decades, many of them have died and been cut down by foresters. The measurements of the annual tree ring width can provide information on how trees respond to drought events. This study aimed to investigate the potential differences between healthy and declining trees (identified as trees to be cut down by foresters). For this purpose, we collected samples of five trees from each group and analysed them using dendrochronological and quantitative wood anatomy approaches. We measured ring width index (RWI) chronologies for healthy and declining trees and compared them with climate data. Additionally, we compared some anatomical features of trees from both groups as cell wall thickness (CWT) and lumen area (LA). The conducted analyses showed significant differences between healthy and declining trees. In particular, declining trees were characterised by lower RWI, LA and CWT values, especially in the past 20 years, and showed greater sensitivity to changes in temperature and humidity than healthy trees.