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Search Results: 1 - 10 of 15390 matches for " forest type "
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Criteria for the definition of forest typologies in southern Apennines forests, Italy
Pignatti G,Terzuolo PG,Varese P,Semerari P
Forest@ , 2004,
Abstract: The study deals with the criteria used to define forest typologies based on several stands located in the Southern Apennines. Aspects of floristic analysis, structure and functions of 19 forest types were examined and recognized in stands with a predominance of Quercus ilex, Quercus pubescens, Quercus cerris, Ostria carpinifolia and Castanea sativa.
The importance of forest type when incorporating forest edge deposition in the evaluation of critical load exceedance
Wuyts K,De Schrijver A,Verheyen K
iForest : Biogeosciences and Forestry , 2009, DOI: 10.3832/ifor0486-002
Abstract: This paper provides an assessment of the effect of incorporating edge deposition in the evaluation of critical load exceedance in forests, taking into account pollutant type, meteorological conditions, edge orientation, and forest type. In particular we have calculated critical load exceedance in five Flemish regions differing in forest fragmentation extent and/or share of coniferous forest.
Rosas,Marco; Espinosa,Miguel; Acu?a,Eduardo; Sáez,Katia;
Gayana. Botánica , 2004, DOI: 10.4067/S0717-66432004000100005
Abstract: this study analyzes interannual variation and synchrony of seed production of native tree species in cordillera pelada, south-central chile. we analyze seed production data collected by donoso (1993) and donoso (1993) et al. at two sites, occupied by valdivian rainforest and fitzroya cupressoides forest, for periods of 10 and 7 years, respectively. there was wider interannual variation at the higher-altitude site dominated by f. cupressoides, than at the lower-altitude valdivian rainforest site. in contrast, there was no significant difference in variability between wind-pollinated and insect-pollinated species. at neither of the two sites was there significant synchrony of seed production among the species of the assemblage. there was, however, significant synchrony between the two populations of the only species common to both sites, drimys winteri. precipitation, and especially summer and winter temperatures were correlated with seed production in some of the species at both sites. results suggest that the effect of the site on plant populations is an important element to consider to clarify synchrony between species and mast seeding
European Forest Types. Categories and types for sustainable forest management reporting and policy
Portoghesi L
Forest@ , 2006,
Abstract: Some considerations are reported on the Environmental European Agency, Technical report N. 9 by Barbati A, Corona P and Marchetti M: “Categories and types for sustainable forest management reporting and policy”.
The Effects of Different Forest Conditions on Soil Macroporosity and Soil Hardness: Case of a Small Forested Watershed in Japan
Bam Haja Nirina Razafindrabe,Shoji Inoue,Tsugio Ezaki
Journal of Biological Sciences , 2006,
Abstract: The effects of different forest conditions on soil macroporosity and soil hardness was investigated in natural and artificial forests in the Ehime University Forest, Japan. Eleven treatments were established based on forest type and stand density of Japanese cedar and cypress. Stand density was indicated by relative yield index (Ry), function of standing volume and stem density. General Linear Model Analysis of SPSS was used to test whether differences in soil macroporosity and soil hardness were statistically significant in different treatments, followed by Tukey HSD in case of significance. Results showed that in topsoil, natural forest, Japanese cedar and cypress with Ry comprised between 0.50 and 0.60 had the highest means of soil macroporosity. The lowest means were found in Japanese cedar with Ry: 0.70-0.80 and Japanese cedar and cypress with Ry: 0.80-0.95. Soil hardness did not have notable differences among the treatments except for Japanese cedar and cypress with Ry: 0.80-0.95 where means were higher than in others. In general, subsoil did not differ in areas with different forest conditions. These results suggest that thinning operations are needed in areas with high Relative yield Index (Ry > 0.70, corresponding to excessive density forest) where poorer soil properties were found.
The Relationships among Community Type, Peat Layer Thickness, Belowground Carbon Storage and Habitat Age of Mangrove Forests in Pohnpei Island, Micronesia  [PDF]
Kiyoshi Fujimoto, Yukira Mochida, Takao Kikuchi, Ryuichi Tabuchi, Yasumasa Hirata, Saimon Lihpai
Open Journal of Forestry (OJF) , 2015, DOI: 10.4236/ojf.2015.51006
Abstract: This paper quantifies the relationships among community type, peat layer thickness and habitat age of the mangrove forests in Pohnpei Island, Micronesia and provides a discussion concerning the primary succession and the belowground carbon storage of the main mangrove community types. The ages of the habitat were estimated from a relationship between the thickness of the mangrove peat layer and the formative period, which was decided by calibrated radiocarbon ages. Mangrove communities in the coral reef type habitat were generally arranged in the following order, from seaward to landward: 1) the Rhizophora stylosa or Sonneratia alba community (I or II communities), 2) the typical subunit of the S. alba subcommunity of the Rhizophora apiculata— Bruguiera gymnorrhiza community (III(2)a subunit) and 3) the Xylocarpus granatum subunit of the same subcommunity of the same community (III(2)b subunit). Their habitat ages were estimated to be younger than 460 years, between 360 and 1070 years and between 860 and 2300 years, respectively. Based on these results and other evidences such as photosynthetic characteristics and pollen analysis derived from the previous studies, the primary succession was inferred to have progressed in the order mentioned above. Belowground stored carbon for the main community types in the coral reef type habitat were estimated to be less than 370 t C ha-1 for the I and the II communities, between 290 and 860 t C ha-1 for the III(2)a subunit and between 700 and 1850 t C ha-1 for the III(2)b subunit.
Impact of Climate Change on Vegetation Distribution and Net Primary Productivity of Forests of Himalayan River Basins: Brahmaputra, Koshi and Indus  [PDF]
A. Chaitra, S. Upgupta, L. D. Bhatta, J. Mathangi, D. S. Anitha, K. Sindhu, Vidya Kumar, N. K. Agrawal, M. S. R. Murthy, F. Qamar, Indu K. Murthy, J. Sharma, R. K. Chaturvedi, G. Bala, N. H. Ravindranath
American Journal of Climate Change (AJCC) , 2018, DOI: 10.4236/ajcc.2018.72018
Abstract: The impacts of climate change in terms of forest vegetation shifts and Net Primary Productivity (NPP) changes are assessed for Brahmaputra, Koshi and Indus river basins for the mid (2021-2050) and long (2071-2100) terms for RCP4.5 and RCP8.5 scenarios. Two Dynamical Global Vegetation Models (DGVMs), Integrated BIosphere Simulator (IBIS) and (Lund Postdam and Jena (LPJ), have been used for this purpose. The DGVMs are driven by the ensemble mean climate projections from 5 climate models that contributed to the CMIP5 data base. While both DGVMs project vegetation shifts in the forest areas of the basins, there are large differences in vegetation shifts projected by IBIS and LPJ. This may be attributed to differing representation of land surface processes and to differences in the number of vegetation types (Plant Functional Types) defined and simulated in the two models. However, there is some agreement in NPP changes as projected by both IBIS and LPJ, with IBIS mostly projecting a larger increase in NPP for the future scenarios. Despite the uncertainties with respect to climate change projections at river basin level and the differing impact assessments from different DGVMs, it is necessary to assess the “vulnerability” of the forest ecosystems and forest dependent communities to current climate risks and future climate change and to develop and implement resilience or adaptation measures. Assessment of the “vulnerability” and designing of the adaptation strategies could be undertaken for all the forested grids where both IBIS and LPJ project vegetation shifts.
Botanical profile of bee pollen from the southern coastal region of Bahia, Brazil
Dórea, Marcos da Costa;Novais, Jaílson Santos de;Santos, Francisco de Assis Ribeiro dos;
Acta Botanica Brasilica , 2010, DOI: 10.1590/S0102-33062010000300028
Abstract: this paper aims to identify the botanical origin of pollen loads collected by apis mellifera l. in canavieiras municipality, bahia state. it provides a list of polliniferous plant species from the atlantic forest biome that are important for the development of regional apiculture. using the acetolysis method, 35 bee-pollen samples were analyzed qualitatively and quantitatively. results showed that pollen types elaeis (23.99%), mimosa pudica (22.78%) and cecropia (13.68%) were the most abundant among the samples. these also showed the highest relative frequencies of the material studied and were important pollen sources for bees in the study area.
Diversidad de frutos de los árboles del bosque tropical perennifolio de México
Ibarra-Manríquez, Guillermo;Cornejo-Tenorio, Guadalupe;
Acta botánica mexicana , 2010,
Abstract: fruit morphology (color, size and type) of 881 tree species (338 genera and 85 families) that inhabit the tropical rain forest in mexico was assessed. we found 46 fruit types and about 52.7% of species had berries (212 species), drupes (163) or loculicidal capsules (89); ten fruit types were represented by just one species. the most abundant fruit colors were (n = 865 species) black (307 species; 35.5%), brown (227; 26.2%) and red (159; 18.4%). berries were usually black (66%), drupes black (53.9%) or red (39.3%) and more than half of loculicidal capsules were brown (66.3%). fruit length varied from 0.8 to 430 mm (mean 31.7 mm) and fruit width from 1 to 145 mm (mean 16.1 mm); these variables were positively correlated (r = 0.55, p < 0.05; n = 743 species). berries, drupes and loculicidal capsules were small (mean size < 22 mm long), while legumes and camaras were longer (mean > 100 mm long). the largest numbers of fruit types per family was recorded for rubiaceae (seven) and 47 of them displayed just one. fruit type frequency and species per family were correlated (r = 0.58, p < 0.05; n = 85 families). such correlation was not sustained at generic level, because 328 genera (97%) showed just one fruit type. our results indicate that fruit morphological diversity of tree species is an important trait to understand the structure and composition of the tropical rain forest.
Arbuscular mycorrhizal colonization of Alnus acuminata Kunth in northwestern Argentina in relation to season and soil parameters
Becerra,Alejandra Gabriela; Arrigo,Nilda Marta; Bartoloni,Norberto; Domínguez,Laura Susana; Cofré,María Noelia;
Ciencia del suelo , 2007,
Abstract: the objective of this study was to determine patterns of arbuscular mycorrhizal (am) colonization of alnus acuminata kunth at two natural forests in relation to soil parameters at two different seasons (autumn and spring). the soil parameters studied were field capacity, ph, electrical conductivity, available p, total n and organic matter. the percentage of am colonization was estimated and correlated to soil properties and to two different seasons. the results indicate that the percentage of am colonization varied among soil types and was higher in spring than autumn. a significant positive correlation was found between am colonization and electrical conductivity, organic matter and total nitrogen. results of this study provide evidence that am colonization of a. acuminata can be affected by some soil parameters and seasonality.
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