scholarly journals Natural Regeneration and Tree Species Composition of Mixed Deciduous Forest after Logging and Shifting Cultivation in Lao PDR

2012 ◽  
Vol 2012 ◽  
Author(s):  
Chanhsamone Phongoudome ◽  
Don Koo Lee ◽  
Silavanh Sawathvong ◽  
Marilyn S. Combalicer
Keyword(s):  
Species Composition ◽  
Tree Species ◽  
Natural Regeneration ◽  
Shifting Cultivation ◽  
Deciduous Forest ◽  
Lao Pdr ◽  
Tree Species Composition ◽  
Mixed Deciduous Forest

scholarly journals Tree Species Composition and Natural Regeneration Status of Southeast Region of Bangladesh

2020 ◽  
Vol 5 (1) ◽  
pp. 27
Author(s):  
Abir Dey ◽  
Aklima Akther
Keyword(s):  
Species Composition ◽  
Tree Species ◽  
Natural Regeneration ◽  
Native Species ◽  
Basal Area ◽  
Conservation Strategies ◽  
Stem Density ◽  
Importance Value Index ◽  
Tree Species Composition ◽  
Large Trees

The study aimed to quantify and discuss the current condition of the tree species composition and natural regeneration of southeast parts of Bangladesh (Cox’s Bazar North Forest Division). A total of 121 stems having dbh ≥10cm and 3481 stems of regenerating tree species (dbh <10cm) per hectare were recorded. A large trees comprised of 17 species belonging to 10 families and 14 genera and 30 regenerating tree species belonging to 19 families and 27 genera have been found. The forests were highly non-uniform, with three or four species represented most of the stands. The values of diversity indices indicated limited plant diversity, which is dominated by two or three tree species. Stems of 10-30 cm dbh contributed almost 90% of the total stem density, whereas more than 80% of the total basal area still belonged to trees with dbh 100 cm or above. Dipterocarpus turbinatus was the most dominant species which have the highest Importance Value Index (IVI) with 135.82 and embodied 37.71% of the total stand density and 72.19% of total basal area. The study will provide scientific basis for the future implementation of forest conservation strategies in tropical forests of Southeast Asia, particularly in Bangladesh. This study may also pave the way to further research on regeneration potentials of the native species for conservation and enhancement of forests in future.

scholarly journals Ecological valence of expanding European ash (Fraxinus excelsior L.) in the Bohemian Karst (Czech Republic)

2012 ◽  
Vol 52 (No. 7) ◽  
pp. 293-305 ◽  
Author(s):  
S. Střeštík ◽  
P. Šamonil
Keyword(s):  
Species Composition ◽  
Tree Species ◽  
Natural Regeneration ◽  
Average Density ◽  
Fraxinus Excelsior ◽  
Water Retention Capacity ◽  
Average Height ◽  
Retention Capacity ◽  
Tree Species Composition ◽  
Bohemian Karst

In 2002 a study focused on the evaluation of height and density of expanding natural regeneration of Fraxinus excelsior L. (FE) was carried out on Velk&aacute; hora Hill, a locality in the Bohemian Karst (Česk&yacute; kras). The examined area is located in Karl&scaron;tejn National Nature Reserve and takes up around 31 ha. The parent rock is limestone. The expansion depends on soil and exposition conditions and relates to the water balance gradient. FE reached the highest densities (up to 6,000 individuals/400 m<sup>2</sup>) on Velk&aacute; hora&rsquo;s peak plateau on medium-deep, heavy-textured decarbonized <br />soils. The lowest expansion (508 individuals/400 m<sup>2</sup>) was found on slopes fully exposed to south (S) with water retention capacity lower than 20 mm. In total, the average density was 1,190 individuals/400 m<sup>2</sup>. FE natural regeneration reached the highest average heights (around 210 cm) on Fageto-Quercetum illimerosum mesotrophicum, the smallest heights on Carpineto-Aceretum saxatile. Average height in the locality was 47 cm. No relation was found between FE natural regeneration height or density and the distance of a fertile specimen. The distance exceeded 70 m only in 3.4%. FE seeds could be detected almost everywhere at the area. FE is capable to establish itself on any location of the studied locality except ecologically extreme parts of rock steppe without forest and Fagus sylvatica L. stands occupying S slopes. On less favourable sites it is capable to use the protection of other tree species and as a low growing tree it can eventually dominate the site. In more favourable conditions it expands on the whole area, where it can dominate the undergrowth already at 1-m height. If the forest sites are left to natural development, a distinctive change in the tree species composition could take place in a short time period. Such a change could have an essential impact on light conditions, energy flux and species composition of plant and animal communities.

Influence of moisture regime and tree species composition on nitrogen cycling dynamics in hardwood forests of Mammoth Cave National Park, Kentucky, USA

2009 ◽  
Vol 39 (2) ◽  
pp. 330-341 ◽  
Author(s):  
Eric S. Fabio ◽  
Mary A. Arthur ◽  
Charles C. Rhoades
Keyword(s):  
Species Composition ◽  
Soil Solution ◽  
Tree Species ◽  
Sugar Maple ◽  
Deciduous Forest ◽  
N Cycling ◽  
Moisture Regime ◽  
Strongly Correlated ◽  
Soil Leachate ◽  
Tree Species Composition

Understanding how natural factors interact across the landscape to influence nitrogen (N) cycling is an important focus in temperate forests because of the great inherent variability in these forests. Site-specific attributes, including local topography, soils, and vegetation, can exert important controls on N processes and retention. Seasonal monitoring of N cycling dynamics was carried out for 2 years in deciduous forest stands that differed in soil moisture status and geologic substrate, and thus, in tree species composition to determine the effects of tree species composition, mediated by moisture and soil chemistry, on N cycling. Geologic substrate influenced soil and soil leachate chemistry but did not appear to affect N cycling in the upper 10 cm. Moisture status was strongly correlated with tree species composition, which was significantly related to N cycling parameters. Sugar maple was associated with high net nitrification rates and soil solution NO3 concentrations, whereas in oak stands nitrification was low and soil solution NO3 was at or near detection limits. Tree species composition in the understory suggests that sugar maple may be increasing in mesic sites and that oak regeneration in all sites is very limited, and a shift in species composition could result in changes to N retention and export.

Long-term effects of climate change on carbon storage and tree species composition in a dry deciduous forest

2017 ◽  
Vol 23 (8) ◽  
pp. 3154-3168 ◽  
Author(s):  
István Fekete ◽  
Kate Lajtha ◽  
Zsolt Kotroczó ◽  
Gábor Várbíró ◽  
Csaba Varga ◽  
...  
Keyword(s):  
Climate Change ◽  
Species Composition ◽  
Carbon Storage ◽  
Tree Species ◽  
Deciduous Forest ◽  
Long Term Effects ◽  
Tree Species Composition ◽  
Dry Deciduous Forest

scholarly journals Gap Structure and Regeneration in the Mixed Old-Growth Forests of National Nature Reserve Sitno, Slovakia

Forests ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 81 ◽  
Author(s):  
Peter Jaloviar ◽  
Denisa Sedmáková ◽  
Ján Pittner ◽  
Lucia Jarčušková Danková ◽  
Stanislav Kucbel ◽  
...  
Keyword(s):  
Species Composition ◽  
Fagus Sylvatica ◽  
Tree Species ◽  
Natural Regeneration ◽  
Nature Reserve ◽  
Oak Forest ◽  
Old Growth ◽  
Tree Species Composition ◽  
Natural Processes ◽  
National Nature Reserve

Forest management mimicking natural processes represents an approach to maintain mixed, uneven-aged stands at small spatial scales. The reliance on natural processes, especially on natural regeneration leads to the use of gap-based regeneration as a fundamental silvicultural technique. As a baseline for such management, we investigated mixed forest in unmanaged National Nature Reserve Sitno in the Western Carpathians, which harbours extraordinary diversity on a rather small scale. To quantify the impact of gaps on gap-filling processes and to assess the role they play in recently observed changes in tree species composition we established a large (2.5 ha) permanent research plot and surveyed the status of natural regeneration, forest structure, tree species composition, and disturbance regime. Our research highlights the long-term and contemporary difficulties in the establishment of Quercus petraea (Matt.) Liebl and Fagus sylvatica (L.). Based on the provided evidence, the native tree species diversity in one of the few preserved old-growth multi-species beech-oak forest remnants is not likely to persist, what could have many implications for future ecosystem functioning. Our results suggest that variation in gap size is an important factor contributing to composition of tree species composition of natural regeneration. The recent intermediate-scale disturbance pattern dominating the old-growth beech-oak forest is beneficial to canopy recruitment of species less shade-tolerant than Fagus sylvatica, as Acer pseudoplatanus (L.), Acer platanoides (L.), and Fraxinus excelsior (L.). We discuss possible factors behind observed shifts in tree species composition and limitations for application of gap dynamics to forest practice in managed beech-oak forest systems. Overall, results of this study may help to design silvicultural measures promoting mixed-species forests to deliver a range of desired ecosystem services.

scholarly journals Species composition in low mountain beech (Fagus sylvatica L.) stands in the Bieszczady National Park under the global warming

2009 ◽  
Vol 55 (No. 5) ◽  
pp. 244-250
Author(s):  
D. Sugiero ◽  
R. Jaszczak ◽  
G. Rączka ◽  
P. Strzeliński ◽  
A. Węgiel ◽  
...  
Keyword(s):  
Global Warming ◽  
Species Composition ◽  
Tree Species ◽  
Natural Regeneration ◽  
National Park ◽  
Soil Conditions ◽  
Species Structure ◽  
Adaptation Level ◽  
Tree Species Composition ◽  
Mature Stand

The author analyzes the changes in the tree species composition of <I>Dentario glandulosae-Fagetum</I> Klika 1927 em. Mat. 1964 in the mountain stands of Bieszczady National Park in 1993–2003. The analysis takes into account the changes over a ten-year period in the number and volume structure of each tree species in each stand layer: young natural regeneration, undergrowth, and mature stand. Additionally, after comparing the results with the natural Carpathian forests’ structure, the adaptation level of the present tree species composition to the current climate and soil conditions, as well as probable directions of future changes have been assessed. A ten-year period is too short to find significant changes in stand species structure but it is possible to see some trends: beech share in stands is increasing and fir is decreasing.

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