CONTRIBUTION OF AGROFORESTS IN ADAPTATION OF CLIMATE CHANGE EFFECTS: ESTIMATING THE PHYTODIVERSITY AND C SEQUESTRATION POTENTIAL IN 8-, 16- AND 24-YEAR-OLD OF PINUS SYLVESTRIS AGROFORESTS IN NORTHERN CAMEROON (TROPICAL AFRICA)

2021 ◽  
pp. 2050010
Author(s):  
V. NOIHA NOUMI ◽  
P. KOUAM KAMNING ◽  
C. KAMDOUM DEMGUIA ◽  
L. ZAPFACK
Keyword(s):  
Aboveground Biomass ◽  
Basal Area ◽  
Allometric Equation ◽  
Shannon Index ◽  
Nondestructive Method ◽  
Total Carbon ◽  
Total Biomass ◽  
Importance Value Index ◽  
Importance Value ◽  
Sequestration Potential

The study aims at assessing the agrobiodiversity and carbon stocks by the pine agroforests in the Sudano-Guinean zone of Cameroon. Five [Formula: see text][Formula: see text]m sampling transects were established in each chronosequence, it was undertaken to assess the growth characteristics and biomass. Estimates of stocks of carbon in aboveground biomass, belowground biomass (BGB), total biomass (TB) and CO2 equivalent stock were incorporated in allometric equation based on nondestructive method. A total of 24 species from 23 genera and 17 families were inventoried. Annona senegalensis, Syzygium guineensis and Hymenocardia acida contributed the most to the importance value index (IVI). Density ranged between [Formula: see text]–[Formula: see text] stems/ha; basal area between [Formula: see text]–[Formula: see text][Formula: see text]m2/ha; Shannon index between [Formula: see text]–[Formula: see text] with the highest value for 8-year-old stands; Pielou’s evenness between [Formula: see text]–[Formula: see text] with the lowest value in 24-year-old stands. Aboveground biomass ranged between [Formula: see text]–[Formula: see text] Mg C/ha with the highest value in 16-year-old stands; belowground carbon from [Formula: see text] Mg C/ha to [Formula: see text] Mg C/ha and total carbon from [Formula: see text] Mg C/ha to [Formula: see text] Mg C/ha. The sequestration potential ranged from [Formula: see text] Mg CO[Formula: see text]/ha to [Formula: see text] Mg CO[Formula: see text]/ha. The sequestration rates were 84.77, 49.7 and 28.6 Mg CO[Formula: see text].ha[Formula: see text]yr[Formula: see text] in 8-, 16- and 24-year-old stands, respectively. Although our data reported that pine stands hosted a few number of species; they are true carbon sinks and useful to the REED[Formula: see text] community.

scholarly journals Structure, composition and tree diversity in a temperate forest under management

2019 ◽  
pp. 29-35
Author(s):  
Antonio Mora-Santacruz ◽  
María Leonor Román-Miranda ◽  
Omar Nungaray-Villalobos ◽  
Gerardo Alberto González-Cueva
Keyword(s):  
Temperate Forest ◽  
Cloud Forest ◽  
Basal Area ◽  
Diversity Indices ◽  
Shannon Index ◽  
Importance Value Index ◽  
Importance Value ◽  
A Value ◽  
Normal Diameter ◽  
Area And Volume

In order to study both diversity indices and structure of forests, which are an essential tool for decision-making in forest management, which show natural successional processes and effects for its management. So the objetive of this study was to evaluate structure and diversity of arboral species in a temperate forest of southern Jalisco state. Five permanent forestry research sites 50 x 50 (2.500 m2) were established, and a census of all tree species was carried out, with normal diameter greater than 7.5 cm. Each individual was measured: height and normal diameter, placing an aluminum plate for identification. We obtained the importance value index (IVI), indices of diversity, richness, and dasometric parameters. There were 17 species, 9 genera and 9 botanical families; the Fagaceae was dominant. Pinus douglasiana presented the highest IVI (57.93%); The Shannon index had a value of 2.0; the index of Margalef was 2.4; the forest has a density of 688 trees ha-1, being the most abundant Styrax ramirezii; Pinus herrerae obtained the highest values in basal area and volume with 30.77 m2 ha-1 and 357,325 m3 ha-1 respectively. The values of diversity are influenced by elements of the cloud forest

scholarly journals Floristic composition, diversity and structure of Khaya senegalensis stands in Benue Department, Cameroon

2021 ◽  
Vol 8 (1) ◽  
pp. 60-68
Author(s):  
Awé Djongmo Victor ◽  
Noiha Noumi Valery Valery ◽  
Madou Chantal Chantal ◽  
Zapfack Louis
Keyword(s):  
Species Richness ◽  
Diversity Index ◽  
Basal Area ◽  
Shannon Index ◽  
Simpson Index ◽  
Importance Value Index ◽  
Importance Value ◽  
Acacia Senegal ◽  
Significant Difference ◽  
Khaya Senegalensis

The present work has been done to provide basic data for a better conservation and valorization ofKhaya senegalensis stands in Sudano-Sahelian zone of Cameroon. A 100 m x 50 m transectmethod was undertaken to measure floristic diversity through the use of species richness,Shannon index, Pielou equitability, Simpson index, importance value index and importance valuefamily. The vegetation structure is determined by density, basal area and biovolume. Theinventory included trees with a dbh ?10 cm on an area of 1 ha per plot. A total of 6743individuals distributed in 24 families, 33 genera and 54 species were inventoried in all Khayasenegalensis stands studied. Statistical analysis showed significant differences, Shannon index,Simpson index, Pielou equitability, density, basal area, biovolume, species richness, heights class,diameters class, circumferences class but does not certify a significant difference of importancevalue index among in the villages. The undergrowth of Khaya senegalensis stands is more diverseat Bamé with a Shannon diversity index (ISH=5.87 ± 0.12 bit). The greatest of Pielou equitabilityis observed at Bamé (EQ=0.80 ± 0.01). The largest of Simpson index is recorded at Bamé(D=0.098 ± 0.001). Khaya senegalensis Stands are denser at Bamé (194 ± 3.12 individuals/ha).The basal area and biovolume of Khaya senegalensis stands are very high at Bamé (BA=25.87 ±0.06 m2/ha and Biovolume =15.32 ± 0.012 m3/ha). The species importance value is maximal in allthe studied villages (SIV=300 ± 71.45). The importance value index of species revealed a cleardominance in the undergrowth of Khaya senegalensis stands are Combretum adenogonium;Acacia senegal; Terminalia laxiflora; Guiera senegalensis; Acacia nilotica; Entada Africana.The vertical structure has three aspects, like the L (Dbh), asymmetric (height) and dissymmetrical(circumference) structures attesting to a strong regeneration of the understory ligneous woods ofKhaya senegalensis stands studied.

scholarly journals Floristic structure and ecological role of Rourea afzelii stand in three savannah ecosystems from Cameroon

2021 ◽  
Vol 8 (1) ◽  
pp. 5-11
Author(s):  
Awé Djongmo Victor ◽  
Noiha Noumi Valery ◽  
Zapfack Louis
Keyword(s):  
Diversity Index ◽  
Basal Area ◽  
Carbon Price ◽  
Shannon Index ◽  
Ecological Role ◽  
Importance Value Index ◽  
Importance Value ◽  
Voluntary Market ◽  
Floristic Structure

The present study investigated the floristic structure and ecological role of Rourea afzelii stands insavannah, forest galleries and swampy areas to Cameroon. An 80 m x 50 m transect method wasundertaken to measure floristic diversity using Shannon index, Pielou equitability, Simpson’s indexand the importance value index. The structure of Rourea afzelii stands is determined by density,basal area and biovolume. The results of this study show that Rourea afzelii stands are morediversified in savannah with a Shannon diversity index (ISH =4 ± 0.03bit). The highest log stabilityof Rourea afzelii stands is observed in the savannah (EQ=0.75 ± 0.008). The Simpson index of theRourea afzelii stands is larger in the forest gallery (D=0.088 ± 0.0022). Rourea afzelii Stands aredenser in savannah (113 ± 2.54 individuals/ha). The basal area and biovolume of Rourea afzeliistands are very high in swamp area (St=15.75 ± 0.02 m2/ha, Biov=9.08 ± 0.12 m3/ha). The diametricstructure has an asymmetrical “L” shaped appearance, indicating a strong regeneration of Roureaafzelii Stands in the three sites studied. Rourea afzelii Stands in forest galleries sequestered morecarbon (26.41 ± 0.0015 ton C/ha) than those in savannahs and swampy areas. This valuecorresponds to sequestration of carbon dioxide of 96.92 ± 0.82 ton CO2/ha. Economically, thiscorresponds to the CDM carbon price (290.77± 3.332 Euros/ha), a Voluntary Market Carbon Priceof 455.54 ± 1.908 Euros/ha, a REDD + carbon price of 9692 ± 8.152 Euros/ha. In conclusion, theresults of this study can be used in the context of protection and conservation as well as thedomestication of such a species.

scholarly journals Species composition, stand characteristics, aboveground biomass, and carbon stock of mangroves in Panabo Mangrove Park, Philippines

2021 ◽  
Vol 22 (6) ◽  
Author(s):  
JEMER A. ALIMBON ◽  
MARK RONALD S. MANSEGUIAO
Keyword(s):  
Species Composition ◽  
Aboveground Biomass ◽  
Carbon Stock ◽  
Stand Structure ◽  
Allometric Equation ◽  
Biomass Estimation ◽  
Importance Value ◽  
Important Species ◽  
Sequestration Potential ◽  
Stand Characteristics

Abstract. Alimbon JA, Manseguiao MRS. 2021. Species composition, stand characteristics, aboveground biomass, and carbon stock of mangroves in Panabo Mangrove Park, Philippines. Biodiversitas 22: 3130-3137. Mangrove ecosystems have been recognized for their roles in climate change mitigation through their carbon sequestration capacity. However, information on the ecology and carbon stock of mangroves is limited. Thus, this study assessed the species composition, stand characteristics, aboveground biomass, and carbon stock of mangroves in Panabo Mangrove Park, Panabo City, Davao del Norte, Philippines. Data for vegetation analysis and biodiversity assessment were collected using transect line plots method. Meanwhile, aboveground biomass estimation was conducted using nondestructive method. Twenty plots with size of 10 m x 10 m each were established to account for the stand characteristics and aboveground biomass of mangroves. Species composition data identified five species from four families. Avicennia marina was the most important species with an importance value of 153.33%. Stand structure analysis revealed a basal area of 14.65 m² ha?¹ and a mean density of 11835 stems ha?¹. Biodiversity indices indicated very low species diversity (H’ = 1.027), low species richness (R = 0.5148) and less even distribution of species (J = 0.6383). Using allometric equation, the aboveground biomass was 77.45 Mg ha?¹ with an estimated stored carbon of 37.18 Mg ha?¹ and sequestration potential of 136.44 Mg CO?ha?¹. These baseline data demonstrate that the area can store and sequester potential amounts of carbon and carbon dioxide, respectively, despite the low diversity.

scholarly journals Fuel beds variation of coastal tropical freshwater forested wetlands in three disturbance regimes at La Encrucijada, Biosphere Reserve, Mexico

2020 ◽  
Author(s):  
Romeo de Jesús Barrios Calderón ◽  
Dulce Infante Mata ◽  
José Germán Flores Garnica ◽  
Jony Ramiro Torres Velázquez ◽  
Zulia Mayari Sánchez-Mejía ◽  
...  
Keyword(s):  
Forest Fires ◽  
Biosphere Reserve ◽  
Basal Area ◽  
Forested Wetlands ◽  
Material Surface ◽  
Importance Value Index ◽  
Importance Value ◽  
High Accumulation ◽  
Horizontal Structure ◽  
Tropical Freshwater

Abstract Background: Tropical freshwater forested wetlands in coastal regions are rapidly disappearing, one of the causes is forest fires. This is caused by high accumulation of fuel beds that can vary in origin and type. Therefore, the objective of this study was to characterize the fuel beds in tropical freshwater forested wetlands with three different level of disturbance at El Castaño, La Encrucijada Biosphere Reserve.Methods: Seventeen sampling units were used to described the strates of forest fuel beds (canopy, sub-canopy and understory) in both the vertical and horizontal stratum. Quantity and quality of dead (fallen woody material, surface litterfall and fermented litterfall) fuels were characterized using the planars intersections technique.Results: A total of eight tree species, two shrubs, five lianas and two herbaceous species were found in tropical freshwater forested wetlands. The vertical structure concentrates the highest proportion of trees between 2 and 12 m high, including the first two defined height classes. The horizontal structure denotes a higher percentage of trees with a normal diameter between 2.5 to 7.5 cm (61.4%) of the total. The sites none disturbance presented the highest arboreal density (2,686 ind. ha− 1), however the highest basal area was found in the sites with medium disturbance (39.41 m2 ha− 1). The richness and diversity of species shows that the Fisher, Margalef, Shannon and Simpson α indices were higher in the sites undisturbed, while the Berger-Parker index shows greater dominance in the sites high disturbance. Pachira aquatica Aubl. was the species with the highest importance value index, and contributes the most to the fuel beds. The average accumulation of dead fuel beds was higher in sites with high disturbance (222.18 ± 33.62 t ha− 1), with the largest accumulations of woody fuels occurring in the 1 h, 10 h and 1000 h classes, the latter in a state of fermentation.Conclusions: It’s important to consider the probability of occurrence of surface fires is high. In these tropical freshwater forested wetlands, independent of disturbance, underground fires have the same probability and the intensity will depend on the depth of the organic matter layer. This study contributes define fire-prone areas in these ecosystems. The results are of great importance to design fire prevention strategies.

scholarly journals Comparison of true mangrove stands in Dudepo and Ponelo Islands, North Gorontalo District, Indonesia

2018 ◽  
Vol 20 (1) ◽  
pp. 259-266
Author(s):  
FAIZAL KASIM ◽  
MIFTAHUL KHAIR KADIM ◽  
SITTI NURSINAR ◽  
ZULKIFLI KARIM ◽  
ALDIN LAMALANGO
Keyword(s):  
Similarity Index ◽  
Basal Area ◽  
Current Status ◽  
Survey Method ◽  
Landsat 8 ◽  
Importance Value Index ◽  
Importance Value ◽  
Mangrove Species ◽  
Rhizophora Apiculata ◽  
The Mean

Kasim F, Kadim MK, Nursinar S, Karim Z, Lamalango A. 2019. Comparison of true mangrove stands in Dudepo and Ponelo Islands, North Gorontalo District, Indonesia. Biodiversitas 20: 259-266. This study aimed to investigate and compare the current status of mangrove areas, as well as the composition and species diversity of mangrove stands in both regions of Dudepo and Ponelo Islands. The results showed that the mangrove areas calculated using the segmentation method in classifying image of Landsat-8 OLI (acquisition on September 2017) were 279.46 ha (Dudepo Island) and 113.35 ha (Ponelo Island) respectively. A total of 13 species of true mangrove were recorded from both islands, using survey method from 9 transect lines (TL), with a distance ranging from 40 to 210 meters (1-6 quadrats) per transect. The mean densities of trees were 2133 ± 329.78 ha-1 (Dudepo Island) and 2111 ± 234.28 ha-1 (Ponelo Island), while those of saplings and seedlings were 58 ± 13.48 ha-1 and 1425 ± 113.96 ha-1 (Dudepo Island), and 79 ± 14.51 ha-1 and 2963 ± 443.22 ha-1 (Ponelo Island). The mean diameter and basal area were 19.73 ± 10.65 cm and 84.22 ± 67.67 m2ha-1 (Dudepo Island), 17.04 ± 1.46 cm and 60.07 ± 15.12 m2ha-1 (Ponelo Island), respectively. The Importance Value Index (IVI) ranged between 3.97-114.87 (Dudepo Island) and 6.04-82.18 (Ponelo Island). The dominant and codominant species based on IVI in both islands were Rhizophora apiculata Blume and R. stylosa Griff. The indexes of diversity, richness, and evenness of mangrove species in both islands were 0.34-1.70, 0.48-1.18, 0.47-0.94 (trees), 0.00-1.10, 0.00-1.82, 0.00-1.00 (saplings), and 0.00.-1.48, 0.00-1.44, 0.72-1.00 (seedlings), respectively. The Bray-Curtis similarity index between Dudepo and Ponelo Islands, based on the overall values of community attributes, was 0.75.

scholarly journals Population status of the tree Sacoglottis holdridgei (Humiriaceae) at Isla del Coco National Park, Costa Rica

2016 ◽  
Vol 64 (1) ◽  
pp. 263
Author(s):  
Luis Guillermo Acosta-Vargas
Keyword(s):  
National Park ◽  
Basal Area ◽  
Forest Monitoring ◽  
Diameter Distribution ◽  
Population Status ◽  
Importance Value Index ◽  
Importance Value ◽  
Data Points ◽  
Using Data ◽  
Annual Mortality

<p>Isla del Coco is the only oceanic island in the Eastern Pacific with humid tropical climate. Its forests have a particular structure with a unique array of plant species and high endemism. There are few studies on the flora or forest monitoring on the island.  The population structure of <em>Sacoglottis holdridgei</em> was analyzed using data from six years with data points taken in 2006 and 2012, including sampling of regeneration in 2012.<em> Sacoglottis holdridgei </em>was the most important tree species, presenting in 2012 the highest Importance Value Index (190.7±21.8), abundance (158.5±40.3 Nha<sup>-1</sup> or 39.5 % of the forest) and basal area (15.6 m<sup>2</sup>ha<sup>-1 </sup>or 72.9 % of the forest). It was present in all three height strata with dominance in the highest. Annual mortality was reported at 3.3 % and recruitment at 1.2 %. The diameter distribution of forest fits the inverted <em>J</em> model, but not for the reported species of which only <em>S. holdridgei</em> tends to adjust for DBH&gt;40 cm. Regeneration fitted the inverted<em> J</em> model with values below those reported for continental forests. Even though it was the dominant species, <em>S. holdridgei </em>showed low regeneration values. This particular condition, give way hypotheses related to the introduction of species, species biology and climate change which could influence the future development of <em>S. holdridgei</em> and forests of Isla del Coco.</p><div> </div>

scholarly journals Carbon sequestration potential of Alnus nepalensis in the mid hill of Nepal: A case study from Kaski district

1970 ◽  
Vol 18 (2) ◽  
pp. 3-9 ◽  
Author(s):  
S Ranabhat ◽  
KD Awasthi ◽  
R Malla
Keyword(s):  
Carbon Sequestration ◽  
Carbon Content ◽  
Soil Carbon ◽  
Total Carbon ◽  
Total Biomass ◽  
Carbon Sequestration Potential ◽  
Alnus Nepalensis ◽  
Sequestration Potential ◽  
Shallow Soils ◽  
Different Parts

This study was carried out to analyze the carbon content in different parts of Alnus nepalensis, and to assess the effect of aspect and altitude in the carbon storage in Alnus nepalensis as well as to quantify the total carbon sequestration (stock) in Alnus nepalensis forest in the mid-hills of Kaski District. The inventory for estimating above and below ground biomass of forest was carried out using stratified random sampling technique. The carbon content in different parts of Alnus nepalensis was quantified using combustion method in the laboratory. For determining the soil carbon content, six soil profiles from each aspect were excavated and soil samples were taken from soil profile up to 1 m depth for deep soil and up to bedrock for shallow soils at the interval of 20 cm. Mean carbon content in stem, branches, leaves and bark of Alnus nepalensis were found to be 40.52%, 33%, 9.56% and 16.4%, respectively. Total biomass carbon sequestered in northern aspect was 30.20 t/ha while for southern aspect it was 39.00 t/ha. In both the aspects higher carbon sequestration was observed at an elevation range of 1200-1300m i.e. 34.8 t/ha and 45.6 t/ha in northern and southern aspects, respectively. Soil carbon sequestration in northern and southern aspects was found to be 113.4 t/ha and 169.30 t/ ha, respectively. The total carbon sequestration potential of Alnus nepalensis forest was estimated to be 186.05 t/ha. Key words: Alnus nepalensis, altitude, aspect, carbon sequestration, mid hills   doi: 10.3126/banko.v18i2.2167 Banko Janakari, Vol. 18, No. 2, 3-9

Structure and floristic composition of a tropical evergreen forest in south-west India

1996 ◽  
Vol 12 (2) ◽  
pp. 191-214 ◽  
Author(s):  
Jean-Pierre Pascal ◽  
Raphael Pelissier
Keyword(s):  
Western Ghats ◽  
Basal Area ◽  
Floristic Composition ◽  
Evergreen Forest ◽  
Systematic Sampling ◽  
Importance Value Index ◽  
Importance Value ◽  
Tropical Evergreen Forest ◽  
Western Ghats Of India ◽  
The Western Ghats

ABSTRACTA permanent plot of 28 ha was established in a dense wet evergreen forest in the Western Ghats of India to study the functioning of the ecosystem. Since April 1990, 1981 trees of ≥30 cm gbh have been enumerated in a systematic sampling of five strips totalling 3.12 ha. This paper describes the main structural and floristic characteristics of the plot.The density (635 trees ≥30 cm gbh per hectare) and basal area (39.7 m2 ha−1) are high. Despite the high diversity (Simpson's D = 0.92 and Shannon's H' = 4.56), four species are distinctly, dominant in terms of an importance value index (relative density + relative basal area). Each of these four species occupies a different layer in the ecosystem: Humboldtia brunonis Wall. (Fabaceae) dominates the undergrowth, Myristica dactyloïdes Gaertn. (Myristicaceae) the intermediate strata, Valeria indica L. (Dipterocarpaceae) the higher canopy level and Dipterocarpus indicus Bedd. (Dipterocarpaceae) the emergents. This pronounced species hierarchy is one of the most important characteristics of the evergreen forests of the Western Ghats. The two dipterocarps account for 20.1% of the total number of trees and contribute 40.9% to the total basal area. This formation can, therefore, be considered as the westernmost lowland dipterocarp forest of Asia.Analysis of the spatial variations in the floristic composition and in the structure of the main species populations shows that two kinds of mature phases can be identified: where the topography is raised and gently sloping, the vertical structure of the stand is discontinuous, with Dipterocarpus indicus and Vateria indica forming an emergent layer above a dense undergrowth; on slopes, the stand is lower, vertically continuous and saturated with Valeria indica and Myristica dactyloïdes. The link between the structure of the stand and dynamic processes is discussed.

scholarly journals How Timber Harvest Affects the Structure and Diversity of a Montane Forest in Southern Mexico

Forests ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 895
Author(s):  
Nayely Martínez-Meléndez ◽  
Neptalí Ramírez-Marcial ◽  
Pablo Martínez-Zurimendi ◽  
Manuel J. Cach-Pérez ◽  
José G. García-Franco
Keyword(s):  
Species Richness ◽  
Dominant Species ◽  
Basal Area ◽  
Timber Harvest ◽  
Montane Forest ◽  
Control Treatment ◽  
Importance Value Index ◽  
Importance Value ◽  
Southern Mexico ◽  
Timber Extraction

Timber extraction directly affects forest structure by opening the canopy, reducing the density and volume of dominant species, and transforming the composition, diversity, and functioning of the forest. We analyze the richness, diversity, and basal area of tree species in a pine–oak montane forest under two stages of the Silvicultural Development Method (thinning and liberation cut treatments) in comparison with remnants of forest considered to be control treatment in the Ocotones forest. Timber extraction began 14 years previously but its effect on the tree structure has not been studied to date in this area. We quantified and measured all the trees with a diameter at breast height >5 cm in 12 0.1 ha circular plots in each treatment. Diversity (Hill numbers) and the importance value index were calculated in each treatment. Observed species richness did not differ between treatments; Pinus oocarpa Schiede ex Schltdl. and Quercus sapotifolia Liebm. were the dominant species regardless of treatment. The principal differences in density and basal area among the treatments were found between the small oaks and small pines. In general, tree density recovered in managed areas because of newly recruited pines and re-sprouting oaks. Although no significant reduction in species richness was detected between treatments, species composition and vegetation structure were modified by the extraction of pine timber and the permanence of many large oaks. Silvicultural treatments appear to create conditions favorable to the maintenance of species richness. The silvicultural interventions in the site meet the objectives of timber production, regeneration, and biodiversity conservation; however, the question of how long the forest can maintain its species diversity and structure after timber extraction remains to be addressed.

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