scholarly journals Characteristics, Floristic Diversity and Structures of Stands Resulting from Assisted Natural Regeneration (ANR) in the Agroecozone of Tibiri in Niger

2021 ◽  
Vol 9 (2) ◽  
Author(s):  
Younoussou Rabo ◽  
Daouda Djadi Salifou ◽  
Salamou Mahamane Tassiou ◽  
Ali Mahamane
Keyword(s):  
Natural Regeneration ◽  
Shape Parameter ◽  
Small Diameter ◽  
Woody Species ◽  
Floristic Diversity ◽  
Diameter Class ◽  
Crop Season ◽  
Floristic Survey ◽  
Crop Fields

The present study was carried out in the municipality of Tibiri where assisted natural regeneration is the method adapted by agriculture to maintain trees for various reasons. The general objective of this study is to characterize the floristic diversity and the structure of the woody stand resulting from assisted natural regeneration. The methodology adopted for this study consisted of inventories of woody species and regenerations in crop fields by placing plots of 50m x 50m during the crop season. Thus twenty (20) plots were placed in the agrosystems according to homogeneity following an equidistance of 300m. The floristic survey made it possible to identify 19 species divided into 9 families of which the most represented are the Fabaceae (72%). The most represented species are P. reticulatum (30%), F. albida (17%) and P. africana (14%). These species also have the highest IVI values. The distribution of individuals by diameter class shows an "inverted J" shape with the shape parameter c = 1.959 (1 <C <3.6), characteristic of populations with a predominance of young or small diameter individuals. The total regeneration density is 2648 stems / ha, grouped into eleven (11) species showing good regeneration and dominated by G. senegalensis representing 61.93% of the density of the inventoried species followed by P. reticulatum (14 , 80%). ANR is a practice that contributes to improving the woody biodiversity of the fields where it is practiced. It is not only an alternative to greening the environment, but also provides several products and services to populations.

Woody plant restoration and natural regeneration in wet meadow at Coomonderry Swamp on the south coast of New South Wales

2000 ◽  
Vol 51 (1) ◽  
pp. 81 ◽  
Author(s):  
N. H. de Jong
Keyword(s):  
Natural Regeneration ◽  
New South ◽  
Woody Species ◽  
Cost Effective ◽  
Wet Meadow ◽  
Casuarina Glauca ◽  
South Wales ◽  
Plant Restoration ◽  
Inhibited Acid ◽  
Sulfate Soils

This study investigated planting techniques and natural regeneration of indigenous woody species within degraded wet meadow wetland at Coomonderry Swamp. Planting tubestock directly into existing vegetation was practical and cost-effective. Clearing of plots allowed infiltration of weeds, early growth of tubestock was inhibited, acid sulfate soils were exposed, and open inundated plots were choked by algae. After four years, Melaleuca ericifolia and Melaleuca linariifolia showed good survivorship at upper and lower elevations. Eucalyptus robusta and Casuarina glauca were more successful at upper elevations, and Leptospermum juniperinum did not succeed at either elevation. These results corresponded to patterns of regeneration and to distributions within undisturbed stands. Despite the evidence of natural regeneration, direct seeding was not successful at the experimental site. Given that poor dispersal was indicated at Coomonderry Swamp, it is unlikely that isolated wetlands in the region could rely solely on seed dispersal for woody revegetation. Even where regeneration can occur naturally, some planting or culling might be required if the desired outcome is a species mix comparable to that observed on undisturbed margins.

scholarly journals Natural Regeneration of the Tree Stand in the Bilberry Spruce Forest—Clear-Cutting Ecotone Complex in the First Post-Logging Decade

Forests ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1542
Author(s):  
Nadezhda V. Genikova ◽  
Viktor N. Mamontov ◽  
Alexander M. Kryshen ◽  
Vladimir A. Kharitonov ◽  
Sergey A. Moshnikov ◽  
...  
Keyword(s):  
Natural Regeneration ◽  
Forest Canopy ◽  
Forest Cover ◽  
Forest Type ◽  
Ground Cover ◽  
Woody Species ◽  
Forest Edge ◽  
Tree Canopy ◽  
Clear Cut ◽  
Clear Cutting

Bilberry spruce forests are the most widespread forest type in the European boreal zone. Limiting the clear-cuttings size leads to fragmentation of forest cover and the appearance of large areas of ecotone complexes, composed of forest (F), a transition from forest to the cut-over site under tree canopy (FE), a transition from forest to the cut-over site beyond tree canopy (CE), and the actual clear-cut site (C). Natural regeneration of woody species (spruce, birch, rowan) in the bilberry spruce stand—clear-cut ecotone complex was studied during the first decade after logging. The effects produced by the time since cutting, forest edge aspect, and the ground cover on the emergence and growth of trees and shrubs under forest canopy and openly in the clear-cut were investigated. Estimating the amount and size of different species in the regeneration showed FE and CE width to be 8 m—roughly half the height of first-story trees. Typical forest conditions (F) feature a relatively small amount of regenerating spruce and birch. The most favorable conditions for natural regeneration of spruce in the clear-cut—mature bilberry spruce stand ecotone are at the forest edge in areas of transition both towards the forest and towards the clear-cut (FE and CE). Clear-cut areas farther from the forest edge (C) offer an advantage to regenerating birch, which grows densely and actively in this area.

scholarly journals NATURAL REGENERATION STRATUM AS AN INDICATOR OF RESTORATION IN AREA OF ENVIRONMENTAL COMPENSATION FOR MINING LIMESTONE, MUNICIPALITY OF BARROSO, MG, BRAZIL

2016 ◽  
Vol 40 (2) ◽  
pp. 189-196 ◽  
Author(s):  
Wanuza Helena Campos ◽  
Sebastião Venâncio Martins
Keyword(s):  
Significant Influence ◽  
Natural Regeneration ◽  
Riparian Vegetation ◽  
Diversity Index ◽  
Floristic Composition ◽  
Psidium Guajava ◽  
Floristic Diversity ◽  
Restoration Process ◽  
Number Of Species ◽  
Management Actions

ABSTRACT This study was conducted in a forest under restoration process, which belongs to the company Holcim Brasil S/A, in the municipality of Barroso, state of Minas Gerais (21º00'to 22º00'S and 43º00' to 44º00'W), where 40 plots (2 x 2 m) were set, spaced at 10 m, forming eight strata parallel to the watercourse present in the area. Floristic composition and natural regeneration stratum were characterized, and the formed strata allowed evaluating whether the riparian vegetation and watercourse influence on the local regeneration. It was found 162 individuals of 13 families, 18 genera and 22 species, and 10,125 individuals/ha were estimated. Successional classes from pioneer and early secondary and zoochory dispersion syndrome prevailed among species and individuals. The watercourse and riparian vegetation did not exercise significant influence (p> 0.05) on the number of species and regenerating individuals among the different strata of the forest. The diversity index of Shannon-Wiener (H') and equability of Pielou (J') were 2.691 and 0.870, respectively. The species Psidium guajava and Myrtaceae families presented the highest VI (value of importance). Natural regeneration analysis showed the low floristic diversity in the area, suggesting that corrective management actions should be adopted.

scholarly journals Analyse De L’état De La Diversité Floristique Des Plateaux Suivant Un Gradient D’aridité Nord- Sud Dans La Réserve De Biosphère Du W Du Niger

2018 ◽  
Vol 14 (3) ◽  
pp. 156
Author(s):  
Mamadou Aïssa Jazy ◽  
Soumana Douma ◽  
Ali Mahamane ◽  
Saadou Mahamane
Keyword(s):  
Hierarchical Classification ◽  
Biosphere Reserve ◽  
Woody Species ◽  
Floristic Diversity ◽  
Plant Resources ◽  
Rainfall Gradient ◽  
African Species ◽  
The North ◽  
Guiera Senegalensis ◽  
Sida Cordifolia

Introduction: In Niger, the degradation of ecosystems leads to a loss of biodiversity and an increase in the adverse effects of climate change, especially in the ecosystems contracted from the plateaux of the Niger W biosphere reserve. Objective: The objective of this study is to characterize the spatial variability of the flora according to the north-south rainfall gradient of the reserve. Methodology: Phytosociological surveys, an ascending hierarchical classification and a canonical analysis of correspondences between plant groups and environmental factors. Results-Discussion: The 126 inventoried species have 88 dicotyledons, 28 woody species, and 98 herbaceous species. The most common families are: Poaceae (21.42%), Fabaceae (12.69%), Rubiaceae (7.14%) and Convolvulaceae (6.34%). The biological spectrum is dominated by therophytes then microphanerophytes. The world chorology is marked by African species followed by palaeotropics or pantropicales, and at the African level, Sudano-Zambezian species are the most frequent. The presence of intermediate species (GC-SZ and GC-SZ-SahS) is noted. From north to south, 3 groups of plants were highlighted: the group with Sida cordifolia and Guiera senegalensis whose phytodiversity is reduced; Group II consisting of the subgrouping with Combretum nigricans and Microchloa indica and the subgrouping with Combretum micranthum and Gardenia sokotensis floristically rich, with however a regeneration dominated by Guiera senegalensis; grouping with Loudetia togoensis and Acacia macrostachya, in good state of conservation. Conclusion: The study made it possible to characterize floristically the various landscapes along the rainfall and anthropic gradient. Thus, in view of the structures of the stands observed, the distribution of floristic diversity increases according to a gradient of decreasing aridity from the periphery to the internal part of the reserve. From the north to the south there is a degraded part, a part gradually invaded by Guiera senegalensis and another well preserved. This work, which provides an overview of the state of conservation of the floristic diversity of the Niger W Biosphere Reserve, allows taking appropriate measures to safeguard our plant resources.

scholarly journals Life form dynamics of the tree layer in evergreen and deciduous broad-leaved mixed forest during 1996–2017 in Tianmu Mountains, eastern China

Silva Fennica ◽  
2020 ◽  
Vol 54 (2) ◽  
Author(s):  
Cheng Bai ◽  
Shixue You ◽  
Weipeng Ku ◽  
Qilin Dai ◽  
Zhengyi Wang ◽  
...  
Keyword(s):  
Mortality Rate ◽  
Life Form ◽  
Eastern China ◽  
Mixed Forest ◽  
Small Diameter ◽  
Life Forms ◽  
Recruitment Rate ◽  
Diameter Class ◽  
Evergreen Species ◽  
The Past

In the forest areas of eastern China, there is a change from forest dominated by deciduous broad-leaved trees to forest dominated by evergreen broad-leaved trees as the latitude or altitude decreases. Different life forms have different survival strategies to deal with climate change, and studying the life form dynamics of the tree layers in the mixed forest in eastern China, with increasing temperature, can help us understand how the forest responds. This study was performed in a 1 ha plot in evergreen and deciduous broad-leaved mixed forest in Tianmu Mountain National Nature Reserve. Based on the data from two surveys (1996 and 2017), the changes in life form composition and biodiversity over the past 21 years were analyzed. We obtained the following results: (1) The proportion of evergreen trees increased from 55.0% in 1996 to 67.5% in 2017, and the dominance of evergreen species was enhanced. (2) The diversity of both life forms increased, and the tree species were more abundant. (3) The average annual recruitment rate of the evergreen species was 2.1% greater than their mortality rate, and the average annual recruitment rate of the deciduous species was 0.5% less than their mortality rate. (4) The competition among the trees in the small-diameter class (10 cm ≤ DBH < 20 cm) was fierce for many tree species. The proportion of the evergreen species in the small-diameter class was high. The life forms making up the mixed climax forest community has changed over the past 21 years, with the proportion and dominance of evergreen trees increasing significantly.

scholarly journals Gap dynamics in Balsam Fir, Abies balsamea - Yellow Birch, Betula alleghaniensis, forests of Québec

2009 ◽  
Vol 123 (2) ◽  
pp. 117 ◽  
Author(s):  
Rémi Hébert ◽  
Jean Huot
Keyword(s):  
Natural Regeneration ◽  
Forest Cover ◽  
Abies Balsamea ◽  
Woody Species ◽  
Balsam Fir ◽  
Regeneration Process ◽  
Betula Alleghaniensis ◽  
Gap Dynamics ◽  
Yellow Birch ◽  
Gap Characteristics

To determine if gap dynamics can play an important role in the natural regeneration process of Balsam Fir (Abies balsamea)-Yellow Birch (Betula alleghaniensis) forests and to determine the effects of gap characteristics on regenerating woody species, we sampled 119 gaps from 64 forest stands in La Mauricie National Park. Gaps averaged 184.5 m² in size. The mean gap age was 7.8 years. Gaps were usually created by broken or uprooted trees and only rarely resulted from Spruce Budworm (Choristoneura fumiferana) outbreaks. We found 25 species that regenerated in the gaps or under the forest cover. When considering all species, significantly more stems/ha were in gaps than under the forest cover. Gap characteristics generally did not influence regenerating woody species. We present a comprehensive model of gap dynamics in Balsam Fir-Yellow Birch forests, starting from a dense canopy, continuing with the creation and colonization of gaps, and ending to the closure of the canopy. Gap dynamics play an important role in the natural regeneration process of Balsam Fir-Yellow Birch forests.Afin de déterminer si la dynamique par trouée peut jouer un rôle important comme processus naturel de régénération de la sapinière à Bouleau Jaune et aussi afin de déterminer les effets des caractéristiques des trouées sur la régénération, nous avons échantillonné 119 trouées dans 64 peuplements forestiers au parc national de la Mauricie. Ces ouvertures avaient une superficie moyenne de 184,5 m². L’âge moyen des ouvertures était de 7,8 ans. Elles étaient généralement créées par un arbre cassé ou déraciné. Peu d’ouvertures étaient créées par des épidémies de la Tordeuse des Bourgeons de l’Épinette. Au total, 25 espèces en régénération ont été rencontrées dans les ouvertures ou sous le couvert forestier. En considérant toutes les espèces, il y avait significativement plus de tiges/ha dans les ouvertures que sous le couvert forestier. Les caractéristiques des trouées n’influençaient généralement pas la régénération. Nous présentons un modèle complet sur la dynamique par trouée dans la sapinière à Bouleau jaune, commençant avec une canopée dense, continuant avec la création et la colonisation des trouées, et se terminant avec la fermeture de la canopée. La dynamique par trouée joue un rôle important dans le régime de perturbations de la sapinière à Bouleau jaune.

scholarly journals Taper, Volume, and Weight of Small Black Cherry and Red Maple Trees in West Virginia

2007 ◽  
Vol 24 (2) ◽  
pp. 104-109
Author(s):  
John R. Brooks
Keyword(s):  
West Virginia ◽  
Small Diameter ◽  
Acer Rubrum ◽  
Tree Size ◽  
Prunus Serotina ◽  
Black Cherry ◽  
Red Maple ◽  
Diameter Class ◽  
Proposed Model ◽  
Volume Equations

Abstract Taper, cubic foot volume, and green weight equations to multiple top diameters were developed for the main bole portion of small-diameter black cherry (BC; Prunus serotina Ehrh.) and red maple (RM; Acer rubrum L.) trees in northern West Virginia. Sample trees were selected from the 2- to 5-in.-diameter class and ranged from 30 to 60 ft in total height. Existing published cubic foot volume equations provided estimates from 6 to 40% lower than estimates from the proposed model form, depending on species and tree size. Based on the published weight equations selected for comparison, differences between the estimates from the proposed models and from the published model with the smallest weight difference from a pool of candidate models, total bole green weight was underestimated from 5 to 93% for BC and from 0.4 to 25% for RM, depending on species and tree size.

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