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Variations in Environmental Signals in Tree-Ring Indices in Trees with Different Growth Potential.

Hafner P, Gričar J, Skudnik M, Levanič T - PLoS ONE (2015)

Bottom Line: We discovered that W oaks grew significantly better over the whole analysed period.The difference between D and W oaks was significant in all analysed variables with the exception of stable carbon isotope discrimination in latewood.Our analysis confirmed our assumptions that separate EW and LW analysis of widths and carbon isotope discrimination provides complementary information in Q. robur dendroecology.

View Article: PubMed Central - PubMed

Affiliation: Department of Forest Yield and Silviculture, Slovenian Forestry Institute, Ljubljana, Slovenia.

ABSTRACT
We analysed two groups of Quercus robur trees, growing at nearby plots with different micro-location condition (W-wet and D-dry) in the floodplain Krakovo forest, Slovenia. In the study we compared the growth response of two different tree groups to environmental variables, the potential signal stored in earlywood (EW) structure and the potential difference of the information stored in carbon isotope discrimination of EW and latewood (LW). For that purpose EW and LW widths and carbon isotope discrimination for the period 1970-2008 AD were measured. EW and LW widths were measured on stained microscopic slides and chronologies were standardised using the ARSTAN program. α-cellulose was extracted from pooled EW and LW samples and homogenized samples were further analysed using an elemental analyser and IRMS. We discovered that W oaks grew significantly better over the whole analysed period. The difference between D and W oaks was significant in all analysed variables with the exception of stable carbon isotope discrimination in latewood. In W oaks, latewood widths correlated with summer (June to August) climatic variables, while carbon isotope discrimination was more connected to River Krka flow during the summer. EW discrimination correlated with summer and autumn River Krka flow of the previous year, while latewood discrimination correlated with flow during the current year. In the case of D oaks, the environmental signal appears to be vague, probably due to less favourable growth conditions resulting in markedly reduced increments. Our study revealed important differences in responses to environmental factors between the two oak groups of different physiological conditions that are preconditioned by environmental stress. Environmental information stored in tree-ring features may vary, even within the same forest stand, and largely depends on the micro-environment. Our analysis confirmed our assumptions that separate EW and LW analysis of widths and carbon isotope discrimination provides complementary information in Q. robur dendroecology.

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Related in: MedlinePlus

Map of study area.Marked are study site (Krakovo forest), meteorological station (Novo mesto) and river measurement station (Podbočje). Map used: World Terrain Base; data sources: Esri, USGS, NOAA); Reprinted from PLOS ONE under a CC BY license, with permission from ESRI Licence Agreement E204 06/13/2014, original copyright June 2009.
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pone.0143918.g001: Map of study area.Marked are study site (Krakovo forest), meteorological station (Novo mesto) and river measurement station (Podbočje). Map used: World Terrain Base; data sources: Esri, USGS, NOAA); Reprinted from PLOS ONE under a CC BY license, with permission from ESRI Licence Agreement E204 06/13/2014, original copyright June 2009.

Mentions: The study site was located in Krakovo Querco robori–Carpinetum forest (45°54’N, 15°25’E, elevation 150 m), the largest floodplain lowland oak forest complex in Slovenia (Fig 1). It is an even-aged forest, where dominant and co-dominant trees prevail. Permission for the field sampling was granted by Slovenia Forest Service. The field study did not involve endangered or protected species.


Variations in Environmental Signals in Tree-Ring Indices in Trees with Different Growth Potential.

Hafner P, Gričar J, Skudnik M, Levanič T - PLoS ONE (2015)

Map of study area.Marked are study site (Krakovo forest), meteorological station (Novo mesto) and river measurement station (Podbočje). Map used: World Terrain Base; data sources: Esri, USGS, NOAA); Reprinted from PLOS ONE under a CC BY license, with permission from ESRI Licence Agreement E204 06/13/2014, original copyright June 2009.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4664244&req=5

pone.0143918.g001: Map of study area.Marked are study site (Krakovo forest), meteorological station (Novo mesto) and river measurement station (Podbočje). Map used: World Terrain Base; data sources: Esri, USGS, NOAA); Reprinted from PLOS ONE under a CC BY license, with permission from ESRI Licence Agreement E204 06/13/2014, original copyright June 2009.
Mentions: The study site was located in Krakovo Querco robori–Carpinetum forest (45°54’N, 15°25’E, elevation 150 m), the largest floodplain lowland oak forest complex in Slovenia (Fig 1). It is an even-aged forest, where dominant and co-dominant trees prevail. Permission for the field sampling was granted by Slovenia Forest Service. The field study did not involve endangered or protected species.

Bottom Line: We discovered that W oaks grew significantly better over the whole analysed period.The difference between D and W oaks was significant in all analysed variables with the exception of stable carbon isotope discrimination in latewood.Our analysis confirmed our assumptions that separate EW and LW analysis of widths and carbon isotope discrimination provides complementary information in Q. robur dendroecology.

View Article: PubMed Central - PubMed

Affiliation: Department of Forest Yield and Silviculture, Slovenian Forestry Institute, Ljubljana, Slovenia.

ABSTRACT
We analysed two groups of Quercus robur trees, growing at nearby plots with different micro-location condition (W-wet and D-dry) in the floodplain Krakovo forest, Slovenia. In the study we compared the growth response of two different tree groups to environmental variables, the potential signal stored in earlywood (EW) structure and the potential difference of the information stored in carbon isotope discrimination of EW and latewood (LW). For that purpose EW and LW widths and carbon isotope discrimination for the period 1970-2008 AD were measured. EW and LW widths were measured on stained microscopic slides and chronologies were standardised using the ARSTAN program. α-cellulose was extracted from pooled EW and LW samples and homogenized samples were further analysed using an elemental analyser and IRMS. We discovered that W oaks grew significantly better over the whole analysed period. The difference between D and W oaks was significant in all analysed variables with the exception of stable carbon isotope discrimination in latewood. In W oaks, latewood widths correlated with summer (June to August) climatic variables, while carbon isotope discrimination was more connected to River Krka flow during the summer. EW discrimination correlated with summer and autumn River Krka flow of the previous year, while latewood discrimination correlated with flow during the current year. In the case of D oaks, the environmental signal appears to be vague, probably due to less favourable growth conditions resulting in markedly reduced increments. Our study revealed important differences in responses to environmental factors between the two oak groups of different physiological conditions that are preconditioned by environmental stress. Environmental information stored in tree-ring features may vary, even within the same forest stand, and largely depends on the micro-environment. Our analysis confirmed our assumptions that separate EW and LW analysis of widths and carbon isotope discrimination provides complementary information in Q. robur dendroecology.

Show MeSH
Related in: MedlinePlus