scholarly journals Fire history and climate-growth response of Abies spectabilis : A case from Langtang National Park, Nepal Himalaya

2019 ◽  
Vol 29 (2) ◽  
pp. 3-12
Author(s):  
S. Basnet ◽  
N. P. Gaire ◽  
P. K. Chhetri
Keyword(s):  
Tree Ring ◽  
Radial Growth ◽  
National Park ◽  
Fire History ◽  
Ring Width ◽  
Negative Influence ◽  
Himalayan Region ◽  
Fire Scars ◽  
Fire Event ◽  
Abies Spectabilis

This study presents the potential of a conifer species (Abies spectabilis D. Don) to reconstruct fire history by using dendro chronological technique along with thedendroclimatic response in Langtang National Park, Central Himalaya of Nepal. For the fire history reconstruction, altogether eight cross-sections samples from fire affected eight trees and another 20 tree-cores from 10 trees with visible fire scars were taken. In the case of dendroclimatic study, 24 healthy cores of A. spectabilis were selected from the 40 cores extracted from 19 trees. The standard dendro chronological methodology was used for sample preparation and analysis. A 199-year long ring-width chronology of A. spectabilis spanning from 1818 to 2016 AD was developed. In spite of visible fire burn in near bark-surface, no potential fire scars are seen in inner parts in the cross-section samples. However, 12 cores showed that three fire burns occurred simultaneously in the forest area in the years 1917−1918, 1969−1970 and 2009−2010, respectively. Tree-ring-based fire event-record is found to be concurrent to the local people's perceptions/experience about the past fire history in the area. Tree growth climate relationship showed sensitive responses to both growing and non-growing season’s temperature and precipitation variability. Summer temperature had positive influence on growth of the species. Precipitation of monsoon and autumn were found to have negative influence on radial growth whereas pre-monsoon precipitation had positive association with tree radial-growth. This preliminary assessment shows that there is a huge potential of tree-ring research for long-term fire history in the region and helps us to better understand the role of fire in the ecology and management in the Himalayan region. The study can also be replicated in other fire-affected areas of the Himalayan region by using fire sensitive species in the sampling.

scholarly journals Relationships Between Climatic Variables and Tree-Ring Width of Silver Fir (Abies alba Mill.) in Kozara National Park (Bosnia and Herzegovina)

2020 ◽  
Vol 11 (1) ◽  
pp. 17-27
Author(s):  
Jelena Subotić ◽  
Vojislav Dukić ◽  
Tatjana Popov ◽  
Goran Trbić ◽  
Zoran Maunaga ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Tree Ring ◽  
Bosnia And Herzegovina ◽  
Radial Growth ◽  
National Park ◽  
Sampling Site ◽  
Ring Width ◽  
Abies Alba ◽  
Silver Fir ◽  
Tree Ring Width

Silver fir (Abies alba Mill.) is the most common conifer species in Bosnia and Herzegovina. The paper describes the development of a silver fir master tree-ring chronology from Kozara National Park and analyzes the influence of the climate conditions on tree-ring widths. The knowledge concerning the effect of climate on cambium activity and, as a result, on tree growth is of great importance for silviculture, which is particularly complex in terms of deterioration of health condition. Four sites were selected for sampling at Kozara National Park. At each sampling site, 15 dominant trees were drilled with Pressler’s increment borer at breast height. The development of chronology included three steps: i) cross-dating of a series of tree-ring width and checking of their quality using the COFECHA program, ii) data standardization in the ARSTAN program, and iii) master chronology development. Correlation analysis was performed in order to determine the links between tree-ring width and climate (primarily temperature and precipitation). In the 88-year-long master chronology, pointer years analysis identified five positive and nine negative years. Correlation analysis revealed that precipitation had stronger and more significant impact on silver fir radial growth, particularly at the beginning of the growing season, in April and May (r=0.175 and r=0.318, respectively), and in the crucial July−September period (r in the range of 0.143−0.222). The highest negative correlation coefficient with temperature was determined for September of the previous year (r=-0.282) and then for summer months (July and August) of the current year (r=-0.184 and r=-0.272, respectively). In addition, statistically significant correlation between radial growth and the Forestry Aridity Index was determined (r=-0.390). The results of tree-ring width climate analysis obtained in this study are in accordance with other studies carried out in Bosnia and Herzegovina and in the surrounding area.

scholarly journals Tree ring variability and climate response of Abies spectabilis along an elevation gradient in Mustang, Nepal

2015 ◽  
Vol 24 (1) ◽  
pp. 3-13 ◽  
Author(s):  
D. K. Kharal ◽  
H. Meilby ◽  
S. Rayamajhi ◽  
D. Bhuju ◽  
U. K. Thapa
Keyword(s):  
Tree Ring ◽  
Tree Growth ◽  
Radial Growth ◽  
Global Climate ◽  
Elevation Gradient ◽  
Ring Width ◽  
Weather Conditions ◽  
Spring Temperature ◽  
Central Nepal ◽  
Abies Spectabilis

In mountainous areas including the Himalayas, tree lines are expected to advance to higher altitudes due to global climate change affecting the distribution and growth of plant species. This study aimed at identifying the tree ring variability of Abies spectabilis (D. Don) and its response to the climate along an elevation gradient in the high Himalayas of central Nepal. Tree core samples were collected from four sites in Mustang district. All sites were located in the same valley and exposed to similar weather conditions. Out of 232 samples collected from the sites, Titi lower (2700 m), Titi upper (2900 m), Pangukhark (3100 m) and Lete upper (3300 m), 44, 40, 39 and 41 series were successfully cross-dated and ring-width chronologies including 168, 79, 138 and 156 years previous to 2012 were developed, respectively. Statistically significant differences in average annual radial growth were noted among the four sites with the highest radial growth observed at mid-elevation sites. Chronological statistics based on residual chronologies for the common period revealed that A. spectabilis at the upper elevation site was more climate sensitive than at the other three sites. At the highest-elevation sites the correlation between pre-monsoon precipitation and tree growth was positive, and for the month of May this was statistically significant (p<0.05). Moreover, spring temperature (March-June) was negatively correlated with precipitation and with tree growth at all sites, and at the upper elevation site (3300 m) the correlation was significant for March, April and May.  Banko Janakari, Vol. 24, No. 1 pp. 3-13

scholarly journals Responses of radial growth, wood density and fiber traits to planting space in poplar plantations at a lowland site

2021 ◽  
Author(s):  
Yanhua Zhang ◽  
Shengzuo Fang ◽  
Ye Tian ◽  
Linlin Wang ◽  
Yi Lv
Keyword(s):  
Tree Ring ◽  
Radial Growth ◽  
Pearson Correlation ◽  
Wood Fiber ◽  
Negative Relationship ◽  
Basic Density ◽  
Ring Width ◽  
Tree Ring Width ◽  
Wood Basic Density ◽  
Fiber Traits

AbstractPoplar is raw material for various panel, paper and fiber products. The 12 sample trees of clone Nanlin-895 from four spacings were destructively harvested after thirteen growing seasons to assess the influence of spacing on radial growth and wood properties. Spacing significantly affected tree-ring width and wood basic density (p < 0.05) but not fiber traits. The highest diameter and wood basic density at breast height (1.3 m) was in 6 m × 6 m and 3 m × 8 m spacings, respectively. However, no significant differences in tree-ring width, wood basic density and fiber traits were observed among the four sampling directions in discs taken at 1.3 m for each spacing. Growth rings from the pith and tree heights had significant effects on wood basic density and fiber anatomical characteristics, highlighting obvious temporal-spatial variations. Pearson correlation analysis showed a significantly negative relationship of tree-ring width to wood basic density, fiber length and fiber width, but a significantly positive relationship to hemicellulose. There was no relationship with cellulose and lignin contents. Based on a comprehensive assessment by the TOPSIS method, the 6 m × 6 m spacing is recommended for producing wood fiber at similar sites in the future.

scholarly journals Growth and yield estimation of Chamaecyparis spp. through tree ring analysis

2013 ◽  
Vol 22 (2) ◽  
pp. 36-42 ◽  
Author(s):  
D. K. Kharal ◽  
T. Fujiwara
Keyword(s):  
Tree Ring ◽  
Radial Growth ◽  
Ring Width ◽  
Forest Products ◽  
Growth And Yield ◽  
Tree Age ◽  
Biomass Estimation ◽  
Tree Ring Analysis ◽  
Ring Density ◽  
Ring Analysis

Tree ring analysis is one of the most useful methods in volume and biomass estimation especially of the conifer trees. Ring width and ring density are important parameters in dendrochronological research. The present research was carried out with the aim of estimating the radial and volumetric growth of the Japanese Cypress trees (Chamaecyperis obstusa and C. pisifera). Destructive method was used while collecting the wood samples from the selected trees. Ring width and ring density were measured using soft X-ray densitometry method using micro-densitometer. Computer programme, developed by the Forestry and Forest Products Research Institute, Japan was used to analyze the ring with and ring density data. The average ring width of the Chamaecyparis spp. was found to be about 3.4 mm at the age of 30 years. However, two types of growth pattern were observed in the trees. Average radial growth was about 5% every year during the first 20 years of the tree age, whereas, the average radial growth was negative during the age of 20–30 years. Average density of the tree rings were increased by about 11% in each height of the trees starting from the ground. Similarly, the stem density decreased by about 3.4% annually along the radial direction from the pith.DOI: http://dx.doi.org/10.3126/banko.v22i2.9197Banko Janakari: A Journal of Forestry Information for NepalVol. 22, No. 2, 2012 November Page: 36-42 Uploaded date: 12/1/2013 

Weakening climatic signal since mid-20th century in European larch tree-ring chronologies at different altitudes from the Adamello-Presanella Massif (Italian Alps)

2012 ◽  
Vol 77 (3) ◽  
pp. 344-354 ◽  
Author(s):  
Anna Coppola ◽  
Giovanni Leonelli ◽  
Maria Cristina Salvatore ◽  
Manuela Pelfini ◽  
Carlo Baroni
Keyword(s):  
Tree Ring ◽  
Function Analysis ◽  
Ring Width ◽  
Negative Influence ◽  
Summer Temperature ◽  
Central Alps ◽  
European Larch ◽  
Climatic Signal ◽  
Temperature Signal ◽  
Over Time

Tree rings from temperature-limited environments are highly sensitive climate proxies, widely used to reconstruct past climate parameters for periods prior to the availability of instrumental data and to analyse the effect of recent global warming on tree growth. An analysis of the climatic signal in five high-elevation tree-ring width chronologies of European larch (Larix decidua Mill.) from the tops of five different glacial valleys in the Italian Central Alps revealed that they contain a strong summer-temperature signal and that tree-ring growth is especially influenced by June temperatures. However, a moving correlation function analysis revealed a recent loss of the June temperature signal in the tree-ring chronologies. This signal reduction primarily involves the two lowest-altitude chronologies. It is probable that the observed increasing importance of late-summer temperature for tree-ring growth over the past 50 yr is an effect of the lengthening growing season and of the variations in the climate/tree-ring relationship over time. All the chronologies considered, especially those at the highest altitudes, show an increasing negative influence of June precipitation on tree-ring growth. The climatic signal recorded in tree-ring chronologies from the Italian Central Alps varies over time and is also differentially influenced by climatic parameters according to site elevation.

Tree-ring model interprets growth decline in natural stands of loblolly pine in the southeastern United States

1989 ◽  
Vol 19 (5) ◽  
pp. 612-621 ◽  
Author(s):  
Robert Zahner ◽  
Joseph R. Saucier ◽  
Richard K. Myers
Keyword(s):  
Tree Ring ◽  
Loblolly Pine ◽  
Radial Growth ◽  
Ring Width ◽  
Stand Density ◽  
Climatic Conditions ◽  
Radial Increment ◽  
Aggregate Model ◽  
Ring Model ◽  
Pine Stands

Annual ring widths and ring areas from 131 even-aged, natural, well-stocked stands of loblolly pine (Pinustaeda L.) in the Piedmont region were analyzed to reveal possible causes of a previously reported decline in radial growth. A linear aggregate model was used to separate independent factors that are known to contribute to radial growth variation in this species. Stand, site, and climatic conditions were reconstructed for each stand for the 36-year period 1949–1984 from previous inventories and from weather records at appropriately located stations. Within each of six 5-year age-classes, the model identified declines in both ring width and ring area associated with stand density, climate changes, and the passage of time. Regional climate first ameliorated this decline as pine stands passed from droughty conditions early in the 36-year period to a favorable climate during the middle of the period, and the decline accelerated later with the return of dry conditions toward the end of the period. The tree-ring model simulates a decline in radial increment in trees in natural pine stands between the ages of 20 and 45 years in the Piedmont which has averaged 1% per year since 1950. Part of the downward trend was attributed to increased competition, part to regional drought, and a considerable part to unidentified factors, possibly regional atmospheric deposition.

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 Reconstruction of fire history in Mexican tropical pines using tree rings

2012 ◽  
Vol 88 (05) ◽  
pp. 553-555 ◽  
Author(s):  
Brooke A. Cassell ◽  
Ernesto Alvarado
Keyword(s):  
Tree Ring ◽  
Tree Rings ◽  
Fire History ◽  
Biosphere Reserve ◽  
Mountain Range ◽  
Fire Scars ◽  
Sierra Madre ◽  
Sierra Madre Del Sur ◽  
Sierra De Manantlán

A dendropyrochronological study was conducted in pine-dominated forest in the Sierra de Manantlán Biosphere Reserve located in the Sierra Madre del Sur mountain range in Mexico. Tropical pines present several difficulties for tree-ring research including missing, false and diffuse rings. This paper discusses the methods that were used to analyze tree rings in order to reconstruct fire history based on the dating of fire scars sampled from tropical pines.

scholarly journals Analysis of carbon stock and radial growth of trees through tree ring analysis in pine forest of linga guthi in Bhaktapur, Nepal

2018 ◽  
Vol 30 ◽  
pp. 248-255
Author(s):  
Saphalta Chhukan ◽  
Siddi Bir Karmacharya ◽  
Sanu Raja Maharjan
Keyword(s):  
Tree Ring ◽  
Radial Growth ◽  
Carbon Stock ◽  
Plant Biomass ◽  
Ring Width ◽  
Measuring System ◽  
Community Forest ◽  
Pinus Roxburghii ◽  
Tree Ring Analysis ◽  
Ring Analysis

Forests are the integral to the global carbon cycle. These ecosystems sequester carbon in the plant biomass and in the soil. The study was carried out in Linga Guthi Community Forest of Bhaktapur to estimate carbon Stock and radial growth of Pinus roxburghii through tree ring analysis. A total of 32 circular plots of 250 m2 area were laid down randomly. Subplots were made for study of saplings, Litter, herbs and soil. For tree ring analysis, tree core samples were collected from different blocks of forest. Ring widths were measured using TSAP-Win Software attached to a LINTAB measuring system. For tree ring analysis, COFECHA and ARSTAN program were used. The average carbon stock of Linga Guthi Community Forest was 272.22±17.36 t/ha. Similarly, it has storage of 206.87± 4.47 t/ha AGTC, 41.37±2.19 t/ha BGTC, 23.814±1.00 t/ha SOC. The carbon sequestration rate of the forest was 2.22 Ct/ha/year. The average radial growth of pine trees in the forest was found to be 2.06 ± 0.13 mm/year. The maximum radial growth was 4.47 mm/yr. The oldest tree recorded in this forest was158 years with 58 cm diameter. However the average age of the forest was 98 years. The ring width chronology of 158 years was prepared for pine tree extending from 1854 to 2013 A.D.

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