scholarly journals Climatic signals extracted from ring-width chronologies of Scots pines from the northern, middle and southern parts of the boreal forest belt in Finland

Silva Fennica ◽  
2000 ◽  
Vol 34 (4) ◽  
Author(s):  
Markus Lindholm ◽  
Hannu Lehtonen ◽  
Taneli Kolström ◽  
Jouko Meriläinen ◽  
Matti Eronen ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Ring Width ◽  
Forest Belt ◽  
Climatic Signals

Relations between tree-ring widths, climate, and annual area burned in the boreal forest of Alberta

1995 ◽  
Vol 25 (11) ◽  
pp. 1746-1755 ◽  
Author(s):  
C.P.S. Larsen ◽  
G.M. MacDonald
Keyword(s):  
Boreal Forest ◽  
Tree Ring ◽  
National Park ◽  
Ring Width ◽  
Weather Conditions ◽  
Fire Weather ◽  
Severity Rating ◽  
Area Burned ◽  
Positive Correlations ◽  
Wood Buffalo National Park

Ring-width chronologies from three white spruce (Piceaglauca (Moench) Voss) and two jack pine (Pinusbanksiana Lamb.) sites in the boreal forest of northern Alberta were constructed to determine whether they could provide proxy records of monthly weather, summer fire weather, and the annual area burned by wildfires in Wood Buffalo National Park. All but one of the standard and residual chronologies exhibited significant positive correlations with June precipitation in the growth year, and all but three of the chronologies exhibited positive correlations with precipitation in June, July, or August of the previous year. Three of the residual chronologies also exhibited negative correlations with June temperature in the growth year. Four of the standard and residual chronologies exhibited significant correlations with the Seasonal Severity Rating fire weather variable from Fort Smith, N.W.T. Four of the standard chronologies and three of the residual chronologies exhibited significant correlations with the annual area burned in Wood Buffalo National Park. Significant correlations were also found for some of the standard and residual chronologies with fire weather and annual area burned in the previous year. These results suggest that ring widths and annual area burned in this portion of the boreal forest are sensitive to similar weather conditions. Tree-ring records may therefore provide a useful means of examining decadal to centennial length relations between climate and annual area burned in the boreal forest.

scholarly journals Dendroindication of ecoclimatic condition in forest remediation area within Northern Steppe of Ukraine

2019 ◽  
Vol 10 (4) ◽  
pp. 457-463
Author(s):  
Y. I. Gritsan ◽  
V. M. Lovynska ◽  
S. A. Sytnyk ◽  
A. I. Hetmanchuk
Keyword(s):  
Ring Width ◽  
Climatic Factor ◽  
Dead Trees ◽  
Values Assessment ◽  
The Difference ◽  
Earlywood Width ◽  
Flood Condition ◽  
General Ring ◽  
Climatic Signals ◽  
Tree Increment

We analyzed ring width, latewood width and earlywood width of Pinus sylvestris trees under normal and flood condition in Dnipropetrovsk region, within Northern Steppe of Ukraine. Precipitation from February to August seems to be the most stable climatic factor which influenced Scots pine growth rate and caused the difference between maximum and minimum ring width in normal conditions. Meteorological conditions were mainly associated with general ring values and earlywood width, and were less associated with latewood width values. Assessment of the effect of climatic signals on tree rings’ growth process in living and dead trees and in the normal and flood condition by analyses of correlation and response function was conducted. Average annual temperatures affected the tree growth negatively in normal conditions and tree increment positively in flood conditions. Annual precipitation was correlated positively with ring width, earlywood width series in normal conditions, but negatively with these series in flood conditions.

scholarly journals Development of a Larix principis-rupprechtii tree-ring width chronology and its climatic signals for the southern Greater Higgnan Mountains

2018 ◽  
Vol 45 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Tongwen Zhang ◽  
Shulong Yu ◽  
Yujiang Yuan ◽  
Liping Huang ◽  
Shengxia Jiang
Keyword(s):  
Tree Ring ◽  
Ring Width ◽  
Low Frequency ◽  
Northern China ◽  
Severity Index ◽  
Drought Severity ◽  
Mountainous Area ◽  
Tree Ring Width ◽  
Large Area ◽  
Climatic Signals

Abstract Forty-one living larch (Larix principis-rupprechtii) trees collected from two sampling sites in 1310–1530 m a.s.l. in the southern Greater Higgnan Mountains in the northeastern China are used to develop a regional tree-ring width chronology. The credible chronology spans 185 years from 1830 to 2014. The results of correlation analyses indicate that moisture is the main climatic factor controlling radial growth of larch trees in this mountainous area. Spatial correlation proves that the regional tree-ring width chronology contains climatic signals representative for a large area including the eastern Mongolian Plateau and Nuluerhu Mountains. A comparison between the newly developed chronology and a May–July Palmer Drought Severity Index (PDSI) reconstruction for the Ortindag Sand Land reveals similar variations, particularly in the low-frequency domain. The tree-ring records also capture a severe and sustained drying trend recorded in the 1920s across a wide area of northern China.

scholarly journals Climate effects on the vitality of boreal forests at the treeline in different ecozones of Mongolia

2017 ◽  
Author(s):  
Michael Klinge ◽  
Choimaa Dulamsuren ◽  
Stefan Erasmi ◽  
Dirk Nikolaus Karger ◽  
Markus Hauck
Keyword(s):  
Climate Change ◽  
Boreal Forest ◽  
Vegetation Index ◽  
Mean Annual Precipitation ◽  
Forest Belt ◽  
Limiting Factor ◽  
Forest Steppe ◽  
Climate Data ◽  
Southern Boundary ◽  
The Mean

Abstract. In northern Mongolia, at the southern boundary of the Siberian boreal forest belt, the distribution of steppe and forest is generally linked to climate and topography, making this region highly sensible to climate change. Detailed investigations on the limiting parameters of forest and steppe occurrence in different ecozones provide necessary information for environmental modelling and scenarios of potential landscape change. In this study, remote sensing data and gridded climate data were analyzed in order to identify distribution patterns of forest and steppe in Mongolia and to detect driving ecological factors of forest occurrence and vulnerability against environmental change. With respect to anomalies in extreme years we integrated the climate and land cover data of a 15 year period from 1999–2013. Forest distribution and vegetation vitality derived from the normalized differentiated vegetation index (NDVI) were investigated for the three ecozones with boreal forest present in Mongolia (taiga, subtaiga, and forest-steppe). In addition to the entire ecozone areas, the analysis focused on different subunits of forest and non-forested areas at the upper and lower treeline, which represent ecological borderlines of site conditions. The total cover of boreal forest in Mongolia was estimated at 73 818 km2. The upper treeline generally increases from 1800 m above sea level (a.s.l.) in the Northeast to 2700 m a.s.l. in the South. The lower treeline locally emerges at 1000 m a.s.l. in the northern taiga and is rising southward to 2500 m a.s.l. The latitudinal trend of both treelines turns into a longitudinal trend in the east of the mountains ranges due to more aridity caused by rain-shadow effects. Less vital trees were identified by NDVI at both, the upper and lower treeline in relation to the respective ecozone. The mean growing season temperature (MGST) of 7.9–8.9 °C and a minimum of 6 °C was found to be a limiting parameter at the upper treeline but negligible for the lower treeline and the total ecozones. The minimum of the mean annual precipitation (MAP) of 230–290 mm yr−1 is an important limiting factor at the lower treeline but at the upper treeline in the forest-steppe ecotone, too. In general, NDVI and MAP are lower in grassland, and MGST is higher compared to the forests in the same ecozone. An exception occurs at the upper treeline of the subtaiga and taiga, where the alpine vegetation is represented by meadow mixed with shrubs. Comparing the NDVI with climate data shows that increasing precipitation and higher temperatures generally lead to higher greenness in all ecological subunits. While the MGST is positively correlated with the MAP of the total ecozones of the forest-steppe, this correlation turns negative in the taiga ecozone. The subtaiga represents an ecological transition zone of approximately 300 mm yr−1 precipitation, which occurs independently from the MGST. Nevertheless, higher temperatures lead to higher vegetation vitality in terms of NDVI values. Climate change leads to a spatial relocation of tree communities, treelines and ecozones, thus an interpretation of future tree vitality and biomass trends directly from the recent relationships between NDVI and climate parameters is difficult. While climate plays a major role for vegetation and treeline distribution in Mongolia, the disappearing permafrost needs to be accounted for as a limiting factor for tree growth when modeling future trends of climate warming and human forest disturbance.

scholarly journals Ecophysiological modeling of photosynthesis and carbon allocation to the tree stem in the boreal forest

2017 ◽  
Vol 14 (21) ◽  
pp. 4851-4866 ◽  
Author(s):  
Fabio Gennaretti ◽  
Guillermo Gea-Izquierdo ◽  
Etienne Boucher ◽  
Frank Berninger ◽  
Dominique Arseneault ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Primary Production ◽  
Boreal Forest ◽  
Carbon Allocation ◽  
Black Spruce ◽  
Gross Primary Production ◽  
Ring Width ◽  
Forest Carbon ◽  
High Frequency Component ◽  
Climate Variables

Abstract. A better understanding of the coupling between photosynthesis and carbon allocation in the boreal forest, together with its associated environmental factors and mechanistic rules, is crucial to accurately predict boreal forest carbon stocks and fluxes, which are significant components of the global carbon budget. Here, we adapted the MAIDEN ecophysiological forest model to consider important processes for boreal tree species, such as nonlinear acclimation of photosynthesis to temperature changes, canopy development as a function of previous-year climate variables influencing bud formation and the temperature dependence of carbon partition in summer. We tested these modifications in the eastern Canadian taiga using black spruce (Picea mariana (Mill.) B.S.P.) gross primary production and ring width data. MAIDEN explains 90 % of the observed daily gross primary production variability, 73 % of the annual ring width variability and 20–30 % of its high-frequency component (i.e., when decadal trends are removed). The positive effect on stem growth due to climate warming over the last several decades is well captured by the model. In addition, we illustrate how we improve the model with each introduced model adaptation and compare the model results with those of linear response functions. Our results demonstrate that MAIDEN simulates robust relationships with the most important climate variables (those detected by classical response-function analysis) and is a powerful tool for understanding how environmental factors interact with black spruce ecophysiology to influence present-day and future boreal forest carbon fluxes.

scholarly journals Ecophysiological modeling of the climate imprint on photosynthesis and carbon allocation to the tree stem in the North American boreal forest

2017 ◽  
Author(s):  
Fabio Gennaretti ◽  
Guillermo Gea-Izquierdo ◽  
Etienne Boucher ◽  
Frank Berninger ◽  
Dominique Arseneault ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Primary Production ◽  
Boreal Forest ◽  
Carbon Allocation ◽  
Black Spruce ◽  
Gross Primary Production ◽  
Ring Width ◽  
Forest Carbon ◽  
High Frequency Component ◽  
Climate Variables

Abstract. A better understanding of the coupling between photosynthesis and carbon allocation in the boreal forest, with implicated environmental factors and mechanistic rules, is crucial to accurately predict boreal forest carbon stocks and fluxes, which are significant components of the global carbon budget. Here we adapted the MAIDEN ecophysiological forest model to better consider important processes for boreal tree species, such as non-linear acclimation of photosynthesis to temperature changes, canopy development as a function of previous year climate variables influencing bud formation, and temperature dependence of carbon partition in summer. We tested these modifications in the eastern Canadian taiga using black spruce (Picea mariana (Mill.) B.S.P.) gross primary production and ring-width data. MAIDEN explains 90 % of the observed daily gross primary production variability, 73 % of the full spectrum of the annual ring width variability and 20–30 % of its high frequency component. The positive effect on stem growth due to climate warming in the last decades is well captured by the model. In addition, we illustrate the improvement achieved with each introduced model adaptation and compare the model results with those of linear response functions. This shows that MAIDEN simulates robust relationships with the most important climate variables (those detected by classical response-function analysis), and is a powerful tool for understanding how environmental factors interact with black spruce ecophysiology to influence present-day and future boreal forest carbon fluxes.

Vessel Chronologies from Teak in Northern Thailand and their Climatic Signal

IAWA Journal ◽  
1999 ◽  
Vol 20 (3) ◽  
pp. 285-294 ◽  
Author(s):  
Nathsuda Pumijumnong ◽  
Won-Kyu Park
Keyword(s):  
Time Series ◽  
Ring Width ◽  
Vessel Diameter ◽  
Transitional Period ◽  
Tree Ring Width ◽  
Wet Season ◽  
Image Analysis Technique ◽  
Vessel Area ◽  
Analysis Technique ◽  
Climatic Signals

Five teak trees in northem Thailand were selected for the study of vessels in terms of dendroclimatology. The tree rings were divided into earlywood and latewood, and fourparameters (average vessel area, average vessel diameter, average conductive area, and vessel density) were measured by automatie image analysis technique to obtain 50-year (1947-1996) time series. Two questions were addressed: 1) How strongly are the vessel characteristics related to climate and 2) are these relationships different from those of ring widths? All vessel parameters of the total ring and of the earlywood were negatively correlated with precipitation during the transitional period between the dry and the wet season. The latewood vessel parameters, however, are negatively correlated with J une temperature. The climatic signals of the vessel parameters and of the tree-ring width are different from each other.

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