Pterocarpus macrocarpus (Burma padauk).

2021 ◽  
Author(s):  
Julissa Rojas-Sandoval
Keyword(s):  
Puerto Rico ◽  
Natural Regeneration ◽  
Average Height ◽  
Native Range ◽  
Sensitive Species ◽  
Northern Thailand ◽  
Volume Table ◽  
Open Forest ◽  
Disturbed Areas ◽  
Tall Tree

Abstract P. macrocarpus is a medium to large (usually up to 25 m tall, but sometimes up to 35 m tall) tree native to Myanmar, northern Thailand, Cambodia, Laos and Vietnam. It is a light-demanding, frost sensitive species, and natural regeneration is generally best in dry, open forest, and in disturbed areas. In its native range it grows best on sandy loams (Hundley, 1957). In Puerto Rico, it has grown well on soils ranging from sandy loams to well-drained clays (Francis, 1989). A volume table is available for a trial plantation in Laos; trees had attained an average height of 14.5 m after 13 years (Hjelm, 1995). Although small trees coppice well, coppicing ability declines with size.

scholarly journals Cordia dentata (white manjack).

2020 ◽  
Author(s):  
Eduardo A. Ventosa-Febles ◽  
Pedro Acevedo-Rodriguez
Keyword(s):  
Puerto Rico ◽  
Virgin Islands ◽  
Cayman Islands ◽  
Native Range ◽  
Us Virgin Islands ◽  
Caribbean Islands ◽  
The North ◽  
Disturbed Areas ◽  
The Us ◽  
The Right

Abstract Cordia dentata is an evergreen tree native to the Americas, from Mexico to the north of South America, including a number of Caribbean islands. It is grown as an ornamental, and cultivated for fruit and wood. It has been introduced in Puerto Rico, the US Virgin Islands and the Cayman Islands. Because it can grow on poor soils it is used for reforestation of denuded areas. It has not been reported as invasive within or outside its native range, but its ability to colonize infertile, disturbed areas may allow it to become invasive in the right conditions.

scholarly journals Author Correction: Small Neotropical primates promote the natural regeneration of anthropogenically disturbed areas

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Eckhard W. Heymann ◽  
Laurence Culot ◽  
Christoph Knogge ◽  
Andrew C. Smith ◽  
Emérita R. Tirado Herrera ◽  
...  
Keyword(s):  
Natural Regeneration ◽  
Neotropical Primates ◽  
Disturbed Areas

scholarly journals Merremia cissoides (roadside woodrose).

2020 ◽  
Author(s):  
Fabiola Areces-Berazain
Keyword(s):  
Herbarium Specimens ◽  
Native Range ◽  
Old World ◽  
Disturbed Areas ◽  
Tropical America ◽  
Weedy Species ◽  
Old World Tropics

Abstract Merremia cissoides is a climbing weed native to tropical America that has been introduced to several Old World countries, presumably as an ornamental. It typically grows in disturbed areas and has been reported as a weed of several crops within its native range. However, it is not as widespread and common as other weedy species of Merremia. In several countries outside its native range, its occurrence has only been documented from one or few herbarium specimens. Nonetheless, the species is considered to be increasingly naturalized in the Old World tropics. It is invasive in Florida (USA) and Cuba.

scholarly journals Etude dendrométrique de Lophira lanceolata de la forêt classée de Toui-Kilibo et ses environs au Bénin

2020 ◽  
Vol 14 (5) ◽  
pp. 1657-1672
Author(s):  
Roméo Worou Adjeran ◽  
Toussaint Olou Lougbegnon ◽  
Gaudence Julien Djego
Keyword(s):  
Data Analysis ◽  
Relative Density ◽  
Basal Area ◽  
Average Diameter ◽  
Average Height ◽  
Relative Dominance ◽  
Open Forest ◽  
Lophira Lanceolata ◽  
Sustainable Conservation

La connaissance des paramètres dendrométriques d’une espèce est nécessaire pour sa conservation durable. Elle permet d’évaluer les ressources disponibles et de lutter contre sa destruction. Cette étude analyse les paramètres dendrométriques de Lophira lanceolata de la forêt classée de Toui-Kilibo et ses environs au Bénin. Les données dendrométriques sont collectées à l’intérieur de 64 placettes carrées de 30 mètres de côté. L’analyse des données prend en compte la contribution en surface terrière de Lophira lanceolata, la densité relative, la dominance relative, la fréquence, l’amplitude d’habitat, le diamètre moyen par les types de formations végétales. Le diamètre moyen de Lophira lanceolata (25,5 cm), la hauteur moyenne (15,21 cm) et la surface terrière moyenne (0,63 m2/ha) de la forêt claire et savane boisée sont supérieurs aux autres types de formations végétales. Ce constat est fait également sur la fréquence, la densité relative, la dominance relative. La contribution en surface terrière de Lophira lanceolata est de 9,363% en forêt claire et savane boisée, 7,398% en savane arborée et arbustive et 2,65% en champs et jachères. En forêt claire et savane boisée, lorsque le diamètre de Lophira lanceolata s’accroît d’un centimètre, sa surface terrière augmente de 0,043 m2/ha. L’étude permet de connaître les ressources disponibles sur Lophira lanceolata et de prendre les décisions sur son aménagement.Mots clés : Lophira lanceolata, paramètres dendrométriques, forêt, savane, Bénin. English Title: Dendrometric study of Lophira lanceolata of the Toui-Kilibo classified forest and its surroundings in Benin Knowledge of the dendrometric parameters of a species is necessary for its sustainable conservation. It makes it possible to assess the resources available and to combat its destruction. This study analyses the dendrometric parameters of Lophira lanceolata of the classified forest of Toui-Kilibo and its surroundings in Benin. Dendrometric data is collected inside 64 square plots 30 meters wide. Data analysis concerns the contribution in basal area of Lophira lanceolata, the relative density, the relative dominance, the frequency, the range of habitat, the average diameter by the types of plant formations. The average diameter of Lophira lanceolata (25.5 cm), the average height (15.21 cm) and the average basal area (0.63 m2/ha) of the open forest and wooded savannah are superior to other types of plant formations. This observation is also made on the frequency, the relative density, the relative dominance. The contribution in basal area of Lophira lanceolata is 9.363% in open forest and wooded savannah, 7.398% in tree and shrubby savannah and 2.65% in fields and fallows. In open forest and wooded savannah, when the diameter of Lophira lanceolata increases by one centimeter its basal area increases by 0.043 m2/ha. The study makes it possible to know the resources available on Lophira lanceolata and to take decisions on its development.Keywords: Lophira lanceolata, dendrometric parameters, forest, savanna, Benin.

scholarly journals First Report of Phytophthora ramorum Infecting California Red Fir in California

Plant Disease ◽  
2010 ◽  
Vol 94 (9) ◽  
pp. 1170-1170 ◽  
Author(s):  
G. A. Chastagner ◽  
K. L. Riley
Keyword(s):  
Shoot Elongation ◽  
Phytophthora Ramorum ◽  
Fluorescent Light ◽  
Average Height ◽  
Tree Plantation ◽  
Usda Forest Service ◽  
Washington State University ◽  
Successful Isolation ◽  
Tall Tree ◽  
Plastic Bag

In May 2005, branches originating from five separate whorls below the terminal on a single California red fir (Abies magnifica) in a mixed grand fir (Abies grandis) and Douglas-fir (Pseudotsuga menziesii) Christmas tree plantation near Los Gatos, CA displayed wilting and dieback of new shoot growth. Brown dieback, delineated by needle loss, extended 6 to 8 cm into 1-year-old and sometimes 2-year-old growth. The ~7-year-old, 1-m tall tree was located near the edge of the plantation, beneath an overstory of California bay laurel (Umbellularia californica) trees that were infected with Phytophthora ramorum. Isolations from dieback margins onto corn meal agar amended with ampicillin, rifamycin, and pimaricin (CARP) yielded hyphae and large, dark brown chlamydospores that were morphologically consistent with P. ramorum (1). Microsatellite analysis confirmed that isolates were of the NA1 lineage of P. ramorum. Isolates were deposited in the Washington State University Puyallup Phytophthora Master Collection. Dormant bareroot California red fir seedlings were obtained from the USDA Forest Service Placerville Nursery (Camino, CA) in February 2006 and planted in SC-10 super cell cones (Stuewe & Sons, Inc., Tangent, OR) in a standard greenhouse potting mix. Seedlings (average height 11 cm) were then forced to initiate bud break and new shoot elongation (0.5 to 1.5 cm) in a greenhouse at 21°C. Eight unwounded seedlings were inoculated with a zoospore suspension (4.185 × 105 zoospores/ml of sterile water) produced from 3- to 4-week-old V8 juice agar cultures of isolate WSU#106-0021 using an artist's airbrush powered by Badger Propel canned propellant. Eight control seedlings were sprayed with water alone. Seedlings were placed in plastic tubs with ~2.5 cm of warm water in the bottom to provide humidity. A plastic bag supported by a wire frame was used to cover each tub. Tubs were placed in a biocontainment unit at 15 to 16°C under 24 h of fluorescent light. The plastic was removed after 5 days and seedlings were left under the same conditions. Seven days after inoculation, 25 to 100% (average 68%) of the new shoots on each of the eight inoculated seedlings were wilted and 100% of these seedlings exhibited dark brown dieback into the 1-year-old stems (range of 1.0 to 2.3 cm, average 1.6 cm). Tissues from shoots and dieback edges were plated onto CARP media. All of these attempts resulted in successful isolation of P. ramorum, and cultures exhibited the same hyphal morphology and chlamydospore characteristics when compared with the isolate tested. Control plants did not develop symptoms. This trial completes Koch's postulates to establish California red fir as a host of Phytophthora ramorum. To our knowledge, this site contains the only reported infection of California red fir by P. ramorum. The potential for infection within its native range is unknown. Reference: (1) S. Werres et al. Mycol. Res. 105:1155, 2001.

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.

scholarly journals Small Neotropical primates promote the natural regeneration of anthropogenically disturbed areas

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Eckhard W. Heymann ◽  
Laurence Culot ◽  
Christoph Knogge ◽  
Andrew C. Smith ◽  
Emérita R. Tirado Herrera ◽  
...  
Keyword(s):  
Natural Regeneration ◽  
Neotropical Primates ◽  
Disturbed Areas

Natural Regeneration of Ground Storey Vegetation in a Semi-Arid Woodland Following Mechanical Disturbance and Burning. 1. Ground Cover Levels and Composition.

1995 ◽  
Vol 17 (1) ◽  
pp. 46 ◽  
Author(s):  
PJ Walker ◽  
TB Koen
Keyword(s):  
Species Composition ◽  
Natural Regeneration ◽  
Ground Cover ◽  
Natural Gas Pipeline ◽  
Total Cover ◽  
Mechanical Disturbance ◽  
South Wales ◽  
Disturbed Areas ◽  
Rainfall Seasonality ◽  
Semi Arid

A study was made over a period of 12 years of the natural regeneration of vegetation along a corridor corridor cleared for the construction of a natural gas pipeline in a semi-arid woodland in central- western New South Wales. Total cover, proportion of grasses, and species composition were assessed on the infilled trench and on areas from which topsoil had been bladed, as well as on adjacent undisturbed areas and areas burned by a wildfire. All areas were grazed continuously by sheep under normal station management, and by native animals. After four years of about average rainfall, total cover on disturbed areas had regained levels as high or higher than on adjacent areas, and was maintained thereafter. On many individual sites this period was as short as eighteen months. The proportion of grasses remained much lower on disturbed areas, except for some periods of annual grass dominance. Species composition remained very different between disturbed and undisturbed areas, the main difference being in perennial species. However, composition also varied markedly between years, according to rainfall seasonality and competition from previously established plants. Little difference was apparent between undisturbed areas and similar areas which had burned twelve months before the first measurements. Mechanical disturbance caused by trenching and blading had a much greater effect on vegetation than did fire, and the effects were still obvious after twelve years.

THE EFFECT OF ALTITUDE ON THE STRUCTURE OF ALEPPO PINE TREES IN THE CHETTABA FOREST (ALGERIA)

2021 ◽  
Author(s):  
Haddad Amar ◽  
Rached-Kanouni Malika
Keyword(s):  
Stand Structure ◽  
Average Diameter ◽  
Aleppo Pine ◽  
Average Height ◽  
Management Measures ◽  
Spatial Systems ◽  
Disturbed Areas ◽  
Pine Trees ◽  
Wide Variability ◽  
Relationship Of

Knowledge of vegetation characteristics is necessary for the management of disturbed areas. The aim of this study was to investigate the effect of elevation on tree structure in Aleppo pine spatial systems in the Chettaba forest, located in northeastern Algeria. An inventory of trees of P. halepensis forest formations was conducted based on dendometric parameters (tree diameter and height) which were measured on 4 plots (30 m × 30 m). The results obtained showed that the average height varies from 7.79 cm to 9.71 cm, while the average diameter appears from 24.39 cm to 30.61 cm, respectively. The height-diameter relationship of the trees varies with the altitude horizons (774 m to 1023 m). The Weibull theoretical distribution was used to characterize stand structure, due to its flexibility and the wide variability of distribution shapes it produces. Management measures, such as full protection of forest relics, will have to be implemented.

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