Climate resilience through natural regeneration in degraded natural forests of south-eastern hilly region of Bangladesh

A study was conducted by using 5m × 5m sized 179 quadrates following multistage random sampling method for comparative regenerating tree species, quantitative structure, diversity, similarity and climate resilience in the degraded natural forests and plantations of Cox's Bazar North and South Forest Divisions. A total of 70 regenerating tree species were recorded representing maximum (47 species) from degraded natural forests followed by 43 species from 0.5 year 39 species from 1.5 year and 29 species from 2.5 year old plantations. Quantitative structure relating to ecological dominance indicated dominance of Acacia auriculiformis, Grewia nervosa and Lithocarpus elegans seedlings in the plantations whereas seedlings of Aporosa wallichii, Suregada multiflora and Grewia nervosa in degraded natural forests. The degraded natural forests possess higher natural regeneration potential as showed by different diversity indices. The dominance-based cluster analysis showed 2 major cluster of species under one of which multiple sub-clusters of species exists. Poor plant diversity and presence of regenerating exotic species in the plantations indicated poor climate resilience of forest ecosystem in terms of natural regeneration.

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Regeneration potentials of native tree species in three natural forests of Sylhet, Bangladesh

Journal of Biodiversity Conservation and Bioresource Management ◽

10.3329/jbcbm.v3i2.36023 ◽

2018 ◽

Vol 3 (2) ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

MR Haider ◽

S Alam ◽

M Mohiuddin

Keyword(s):

Tree Species ◽

Natural Regeneration ◽

Biological Diversity ◽

Seedling Recruitment ◽

Diversity Indices ◽

Natural Forests ◽

Height Range ◽

Regeneration Status ◽

Native Tree ◽

Native Tree Species

Natural regeneration status of native tree species in three natural forests of Moulvibazar, Sylhet Forest Division, Bangladesh was assessed through stratified random sampling method. A total of 70 tree species belonging to 31 families was recorded. Moraceae has the maximum number of species (8 species). Myrtaceae has 6 species and Rubiaceae has 5 species while both Euphorbiaceae and Meliaceae have 4 species each. The families Anacardiaceae, Bignoniaceae, Combretaceae, Fagaceae, Lauraceae, Sterculiaceae, Verbenaceae have 3 species each, while Clausiaceae, Mimosaceae and Ternstroemiaceae has 2 species each, and the rest 16 families (viz. Apocynaceae, Aquifoliaceae, Araliaceae, Arecaceae, Bombacaceae, Burseraceae, Caesalpinaceae, Dilleniaceae, Dipterocarpaceae, Elaeocarpaceae, Lythraceae, Myrsinaceae, Polygalaceae, Rutaceae, Tiliaceae, Thymelaeaceae) comprise one species each. Artocarpus chama represents maximum seedlings production per hectare (2,528), followed by Syzygium firmum (1825), Ficus racemosa (1425), Syzygium fruticosum (1033) and Holigarna caustica (917). Biological diversity indices were also calculated which ensure a promising regeneration status of Moulvibazar Natural forests. The percentage distribution of seedlings was maximum (78.12%) for 0-50 cm height range for all species. The numbers of seedling reduced proportionately with height growth indicating the reduction recruitment of seedlings in Moulvibazar natural forests. Artocarpas chama showed maximum (1.97 %) seedling recruitment. Natural regeneration potential is useful for developing the management plans for effective functioning of Moulvibazar natural forests, Sylhet, Bangladesh.J. Biodivers. Conserv. Bioresour. Manag. 2017, 3(2): 1-10

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NATURAL REGENERATION OF TREE SPECIES IN A CLOUD FOREST IN SANTA CATARINA, BRAZIL

Revista Árvore ◽

10.1590/0100-67622016000600013 ◽

2016 ◽

Vol 40 (6) ◽

pp. 1073-1082 ◽

Cited By ~ 5

Author(s):

Angélica Dalla Rosa ◽

Ana Carolina Silva ◽

Pedro Higuchi ◽

Amanda Koche Marcon ◽

Francieli de Fátima Missio ◽

...

Keyword(s):

Tree Species ◽

Natural Regeneration ◽

Environmental Variables ◽

Cloud Forest ◽

Shannon Index ◽

Santa Catarina ◽

Low Diversity ◽

Class 1 ◽

Ecological Dominance

ABSTRACT This paper aims at characterizing the tree species natural regeneration and evaluating the relation of this stratum to both the adult component and the environmental variables in a fragment of a cloud forest in Santa Catarina, Brazil. In each of 25 20 × 20 m plots, where the adult component and environmental variables have previously been evaluated, subplots of different sizes varying according to plants' height were then allocated as follows: Class 1 - plants with a height varying from 0.15 cm up to 1 m, being evaluated within 5 m2; Class 2 - plants with a height varying from 1 up to 3 m, being evaluated within 10 m2; Class 3 - plants with a height greater than 3 m and DBH smaller than 5 cm, being evaluated within 20 m2. Data have been analyzed with regard to the determination of diversity (Shannon index), evenness (Pielou), Natural Regeneration Index (NRI), similarity with the adult component (Jaccard and Bray-Curtis), floristic-structural organization (Nonmetric Multidimensional Scaling - NMDS) and their relation to environmental variables. A total of 518 individuals distributed in 28 species were sampled. The low values of Shannon index (2.51 nat/ind) and evenness (0.75) suggest low diversity and elevated ecological dominance. The highest NRI has been found in the species Symphyopappus itatiayensis (Hieron.) R.M.King & H.Rob (19.36%). The similarity with the adult component were of 0.45 (Jaccard) and 0.24 (Bray-Curtis), demonstrating a low overall similarity (<0.50). The soil compaction was the only variable that has shown a relation with regeneration, which can be related to cattle's presence in the fragment.

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Regeneration status and species diversity of major tree species under scientific forest management in Kapilbastu district, Nepal

Banko Janakari ◽

10.3126/banko.v31i2.41898 ◽

2021 ◽

Vol 31 (2) ◽

pp. 26-39

Author(s):

B. Aryal ◽

S. Regmi ◽

S. Timilsina

Keyword(s):

Forest Management ◽

Species Diversity ◽

Tree Species ◽

Diversity Indices ◽

Management Technique ◽

Timber Species ◽

Natural Forests ◽

Regeneration Status ◽

The Simpsons ◽

Regeneration Condition

In Nepal, scientific forest managementhas been practiced as an effective forest management technique to utilize forest resources sustainably. However, the program has faced many controversies such as intentional logging of only high-valued timber species like Shorearobusta. In addition, few believe this program is severely affecting the regeneration productivity and species diversity in the natural forests. In order to address these issues, we examinedthe regeneration condition and plant species diversity in the stands where scientific forest management operations were carried out. The data related to regeneration status and species diversity were collected using a systematic random sampling of the selected stands. Our results showed good regeneration conditions (Seedling >5000, Sapling>2000) in all the studied stands. The tree species community was dominated by S.robusta(Sal) followed by Schleicheraoleosa (Kusum) and Casia fistula (Rajbriksha). The value of diversity indices of different species varied significantly between felling series. The highest diversity was found in the second year felling series with the Simpsons Index of dominance value 0.6934 and the lowest species diversity was in the first year felling series with a value of 0.8448. It can be recommended that the regeneration felling practice has helped in promoting the regeneration condition and growth.

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Soil Seed Banks of Tree Species from Natural Forests, Restoration Sites, and Abandoned Areas in Chiang Mai, Thailand

Forest and Society ◽

10.24259/fs.v5i1.11612 ◽

2021 ◽

pp. 167-180

Author(s):

Patsavipich Rungrojtrakool ◽

Pimonrat Tiansawat ◽

Arunothai Jampeetong ◽

Dia Panitnard Shannon ◽

Sutthathorn Chairuangsri

Keyword(s):

Seed Dispersal ◽

Species Composition ◽

Tree Species ◽

Natural Regeneration ◽

Seed Banks ◽

Seed Density ◽

Natural Forests ◽

Chiang Mai ◽

Soil Seed Banks ◽

Standing Vegetation

Soil seed banks have been used for investigation of natural regeneration of forests. In this study, we compared seed density and species composition of soil seed banks of trees among natural forests, restored forests of different ages, and abandoned agricultural land. The soil seed banks were collected from a natural forest (NF), 12-year-old and 17-year-old restoration sites (RF12y and RF17y), and 17-year-old abandoned site (AA) at Ban Mae Sa Mai, Chiang Mai, Thailand. A seedling emergence technique was used to assess seed density and species of emerged seedlings was identified. We found 5-8 tree species at each site. Seed densities in the study areas ranged from 43 to 298 seeds/m2. The seed density of RF12y was significantly higher than that of both NF and AA but not significantly different than RF17y (p < 0.01). Although there was no significant relationship between the restoration ages and the seed densities of the soil seed banks, the species composition of standing vegetation was related to the seed bank species. Sorensen’s similarities between the species composition of the soil seed banks and the existing trees in each area were between 0 and 13.79%, suggesting seed dispersal of both within and across study sites. Eight out of fourteen species in the soil seed banks were dispersed into restoration sites without standing vegetation of those species. Seven of those were animal-dispersed species. The selected native trees, framework species, attracted small seed dispersers into the study areas, especially at the restoration sites. This finding suggests that active forest restoration improved natural regeneration in restoration sites as well as neighboring areas via seed dispersal.

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Tree Diversity Conservation Initiatives in Sacred Groves of Kathmandu Valley, Nepal

Nepal Journal of Science and Technology ◽

10.3126/njst.v19i1.29768 ◽

2020 ◽

Vol 19 (1) ◽

pp. 60-68

Author(s):

Laxmi Joshi Shrestha ◽

Mohan Devkota ◽

Bhuvan Keshar Sharma

Keyword(s):

Tree Species ◽

Management System ◽

Survey Methods ◽

Belief Systems ◽

Decisive Role ◽

Diversity Indices ◽

Kathmandu Valley ◽

Sacred Grove ◽

Sacred Groves ◽

The Government

The study was conducted in two sacred groves of Kathmandu Valley, Pashupati Sacred Grove, and Bajrabarahi Sacred Grove, aiming to analyze the diversity of tree species and their role in conserving biodiversity. Parallel transects with concentric circular plot survey methods were applied for data collection. During the study, 23 tree species belonging to 22 genera and 15 families were recorded in Pashupati sacred grove, whereas only 19 tree species belonging to 16 genera and 13 families were recorded from Bajrabarahi Sacred Grove. The Shannon-Weiner diversity indices were higher (H=1.91) in Pashupati Sacred Grove compared to Bajrabarahi Sacred Grove, with 1.80 Shanon-Weiner Indices. Three types of forest were recorded from Pashupati Sacred Grove, namely the Schima-Pyrus forest, Myrsine-Persea forest, and Quercus-Myrsine forest, and only one Neolitsiacuipala forest from Bajrabarahi Sacred Grove. The sacred grove is one of the pioneers and community-based management regimes of the forest resource management system. It plays a decisive role in biodiversity conservation as it associated with many taboos and belief systems, thus providing a better opportunity for conservation compared to that of the government management system.

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Langfristige Entwicklung von zwei Waldgesellschaften im Białowieża-Urwald

Schweizerische Zeitschrift fur Forstwesen ◽

10.3188/szf.2008.0080 ◽

2008 ◽

Vol 159 (4) ◽

pp. 80-90 ◽

Cited By ~ 3

Author(s):

Bogdan Brzeziecki ◽

Feliks Eugeniusz Bernadzki

Keyword(s):

Species Composition ◽

Tree Species ◽

Stand Structure ◽

Temporal Dynamics ◽

Structural Parameters ◽

Forest Communities ◽

Natural Forests ◽

Tree Species Composition ◽

Strong Trend ◽

Long Term Study

The results of a long-term study on the natural forest dynamics of two forest communities on one sample plot within the Białowieża National Park in Poland are presented. The two investigated forest communities consist of the Pino-Quercetum and the Tilio-Carpinetum type with the major tree species Pinus sylvestris, Picea abies, Betula sp., Quercus robur, Tilia cordata and Carpinus betulus. The results reveal strong temporal dynamics of both forest communities since 1936 in terms of tree species composition and of general stand structure. The four major tree species Scots pine, birch, English oak and Norway spruce, which were dominant until 1936, have gradually been replaced by lime and hornbeam. At the same time, the analysis of structural parameters indicates a strong trend towards a homogenization of the vertical stand structure. Possible causes for these dynamics may be changes in sylviculture, climate change and atmospheric deposition. Based on the altered tree species composition it can be concluded that a simple ≪copying≫ (mimicking) of the processes taking place in natural forests may not guarantee the conservation of the multifunctional character of the respective forests.

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The composition and diversity of natural regeneration of tree species in gaps under different intensities of forest disturbance

Journal of Forestry Research ◽

10.1007/s11676-020-01269-6 ◽

2021 ◽

Author(s):

Maame Esi Hammond ◽

Radek Pokorný ◽

Daniel Okae-Anti ◽

Augustine Gyedu ◽

Irene Otwuwa Obeng

Keyword(s):

Tree Species ◽

Natural Regeneration ◽

Forest Disturbance ◽

Forest Site ◽

Gap Formation ◽

Tree Species Composition ◽

Forest Sites ◽

Significant Difference ◽

Shade Tolerant Species ◽

Disturbed Forest

AbstractThe positive ecological interaction between gap formation and natural regeneration has been examined but little research has been carried out on the effects of gaps on natural regeneration in forests under different intensities of disturbance. This study evaluates the composition, diversity, regeneration density and abundance of natural regeneration of tree species in gaps in undisturbed, intermittently disturbed, and disturbed forest sites. Bia Tano Forest Reserve in Ghana was the study area and three gaps each were selected in the three forest site categories. Ten circular subsampling areas of 1 m2 were delineated at 2 m spacing along north, south, east, and west transects within individual gaps. Data on natural regeneration < 350 cm height were gathered. The results show that the intensity of disturbance was disproportional to gap size. Species diversity differed significantly between undisturbed and disturbed sites and, also between intermittently disturbed and disturbed sites for Simpson’s (1-D), Equitability (J), and Berger–Parker (B–P) indices. However, there was no significant difference among forest sites for Shannon diversity (H) and Margalef richness (MI) indices. Tree species composition on the sites differed. Regeneration density on the disturbed site was significantly higher than on the two other sites. Greater abundance and density of shade-dependent species on all sites identified them as opportunistic replacements of gap-dependent pioneers. Pioneer species giving way to shade tolerant species is a natural process, thus make them worst variant in gap regeneration.

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Restoration of floral diversity through plantations on abandoned agricultural land

Canadian Journal of Forest Research ◽

10.1139/x06-021 ◽

2006 ◽

Vol 36 (5) ◽

pp. 1218-1235 ◽

Cited By ~ 24

Author(s):

Steven G Newmaster ◽

F Wayne Bell ◽

Christopher R Roosenboom ◽

Heather A Cole ◽

William D Towill

Keyword(s):

Plant Diversity ◽

Tree Species ◽

Agricultural Land ◽

Structural Diversity ◽

Geographic Region ◽

Natural Forests ◽

Community Interactions ◽

Long Term Study ◽

Floral Diversity ◽

The Impact

Plantations have been claimed to be "monocultures", or "biological deserts". We investigated these claims in the context of a long-term study on plant diversity within plantations with different indigenous tree species, spacings, and soil types that were compared with 410 native stands. Soil type had no influence on plantation species diversity or abundance, and wider spacing resulted in higher richness, lower woody plant abundance, slightly higher cover of herbaceous plants, and large increases in cryptogam cover. We also found a canopy species × spacing interaction effect, where the impact of increased spacing on understory vegetation was more pronounced in spruce than in pine plantations. The dynamic community interactions among species of feathermoss appear to be in response to the physical impediment from varying amounts of needle rain from the different tree species. High light interception and needle fall were negatively correlated with understory plant diversity, as was lack of structural diversity. This study indicates that through afforestation efforts agricultural lands can be restored to productive forests that can harbour nearly one-half of the plant species found in equivalent natural forests within the same geographic region in as little as 50 years. We recommend applying afforestation using indigenous conifer species as a first step towards rehabilitating conifer forests that have been converted to agriculture and subsequently abandoned.

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