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32 results for “floristic composition”
Vegetation of post-mining areas, Upper Silesia, Poland (Floristic composition of the plots_November_2022)
<p><span><span>The data set containing a list of plant species in the research plots along with their percentage coverage.</span></span> <span><span>The selection of plots took into account the occurrence of the dominant species (cover > 40% of the study plot area).</span></span> <span><span>The dominant species represent functional groups: monocots, forbs and legumes.</span></span></p>
Floristic composition in three different forest types in western Amazonia
<p><span><span>Aim</span></span><span>: The latitudinal gradient is considered a first-order biogeographical pattern for most taxonomic groups. Yet, latitudinal changes in plant ecological communities are not always consistent, and this could be related to the physical and biological characteristics of different forest types. In this study, we compare latitudinal changes in floristic diversity (alpha diversity), composition (beta diversity), and dominance across different tropical forest types: floodplain, <em>terra</em> <em>firme</em>, and submontane forests. </span></p> <p><span><span>Location</span></span><span>: Western Amazonia (Ecuador, Peru, and Bolivia).</span></p> <p><span><span>Taxon</span>: Woody plants. </span></p> <p><span><span>Methods</span></span><span>: We inventoried 1,978 species and 31,203 individuals of vascular plants with a diameter at breast height ≥ 2.5 cm in 118 0.1-ha plots over a 1,800-km latitudinal gradient in three different forest types. The relationships between alpha diversity, latitude, and forest type were analysed using generalised linear mixed models (GLMMs). Semi-parametric permutational multivariate analysis of variance was used to investigate the effects of latitude and forest type on beta diversity. Dominant species abundances were correlated with non-metric multidimensional scaling ordination axes to reflect their contributions in shaping changes in beta diversity. </span></p> <p><span><span>Results</span></span><span>: Alpha diversity increased towards equatorial latitudes in <em>terra</em> <em>firme</em> and submontane forests but remained relatively constant in floodplains. Beta diversity of all forest types changed with latitude, although less clearly in floodplains. Overall, the abundances of dominant species decreased towards the Equator, though in floodplains they were more homogeneous along the gradient.</span></p> <p><span><span>Main conclusions</span></span><span>: Alpha diversity, beta diversity and dominance patterns differed across forest types. In floodplain forests, the flooding regime is a strong predictor of floristic composition, which maintains alpha diversity constant along the latitudinal gradient. However, alpha and beta diversity in unflooded forests increase steadily towards equatorial latitudes. Furthermore, we found fewer dominant species contributing to changes beta diversity in floodplain forests. Shifts in abundance of dominant species over gradients can explain how beta diversity is driven differently per forest type.</span></p>
Floristic composition in three different forest types in western Amazonia
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A case study of the effects of wetland restoration on the hydrology, species diversity, species composition and floristic quality of restored wetlands within a Central Florida ranchland, 2003 - ongoing.
In the USA the United States Department of Agriculture (USDA) Natural Resource Conservation Service (NRCS) has restored millions of acres of wetlands through its Wetland Reserve Easement (WRE) programs. However few quantitative studies have explored whether WREs have enhanced wetland hydrology and wetland plant communities. Additionally USDA Compatible Use Permits for cattle grazing and other management practices are sometimes issued for WREs but little is known about potential benefits/detriments of such practice on the success of wetland restoration. In this study we tested if hydrological restoration of previously drained species poor pastures increased water depth and hydroperiod. Restoration involved plugging key ditches adding water control structures and a berm. We also tested if hydrological restoration increased plant diversity (alpha and beta) floristic quality (using coefficient of conservatism) and increased the cover of wetland species (using species wetland status). Finally we tested if cattle grazing had an effect on the success of restoration by comparing grazed plots to fenced plots. We studied two conservation easements (a total of 748 acres) located on semi-native pastures in central Florida USA. We monitored vegetation using permanent transects stratified by vegetation type before (2004-2005) and after (2012) the restoration (2008). We assessed wetland hydroperiod using groundwater wells set up in 2003 and located within and outside the boundaries of these two easements.
Floristic composition, structure and diversity of riparian forests in southwestern Nigeria: Conservation is inevitable
<p>The Nigerian riparian forest ecosystems had declined in extent and distribution and this had been attributed mainly to land use change. This study intended to provide an understanding of the links between plant diversity, composition, structures, and disturbances both anthropogenic and natural processes inducing the vegetation dynamics. Nine study sites were used for this study, within each site, five (5) plots (0.25 ha in size) were marked out and placed systematically at an interval of 10 m along the transect. A complete enumeration of plant species was carried out and identified at the species level. Diversity indices and structural parameters were determined and anthropogenic activities were ranked. A total number of 233 plant species were identified, belonging to 80 families; out of which, Euphorbiaceae and Apocynaceae were dominant families The density and basal area ranged from 2,200-6,000 ha<sup>-1</sup> and 2.59-17.58 m<sup>2</sup> ha<sup>-1</sup> respectively across the study sites. <em>Pterocarpus santalinoides</em>, <em>Alchornea cordiflora</em>, <em>Chassalia kolly</em>, <em>Tetracera</em> spp,<em> Fimbristylis</em>, <em>Bambusa vulgaris</em> and <em>Cyrtosperma senegalense</em> were the dominant species. The Shannon diversity index ranged from (1.38-3.49), Simpson (0.66-0.97), and Evenness diversity (0.43-0.84). Fisher alpha (10.03-30.21) and Whittaker beta diversity (0.36-0.89) values were highest in Ipetumodu (site VIII) and lowest in Ilesha (site II). Seventy-three (73%) of the species in this study had a low important value index (IVI). The dominance of some lianas and herbaceous species in the riparian forest sites showed disturbances, stages of ecological succession, and regeneration of the vegetation. Conservation is inevitable towards maintaining and protecting species diversity, ecosystem roles, and services of these forests in Nigeria.</p>
Data from: Biogeographic history and habitat specialisation shape floristic and phylogenetic composition across Amazonian forests
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Floristic composition, structure and diversity of riparian forests in southwestern Nigeria: Conservation is inevitable
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Supplementary material 1 from: Huang J, Guo Z, Tang S, Ren W, Chu G, Wang L, Zhao L, Yu R, Xu Y, Ding Y, Zang R (2020) Floristic composition and plant diversity in distribution areas of native species congeneric with Betula halophila in Xinjiang, northwest China. Nature Conservation 42: 1-17. https://doi.org/10.3897/natureconservation.42.54735
Figure S1. The correlation between environmental variables in distribution areas of five congeneric species with Betula halophila
Data from: The mesic savannas of the Bateke Plateau: carbon stocks and floristic composition
The Bateke Plateau in the Republic of Congo is one of the last frontiers for ecology, with little known about its floristics and physiognomy. Despite occupying 89,800 km2 and its importance for local livelihoods, its ecology and ecosystem functions are poorly understood. Situated on Kalahari sands, the Bateke has a complex evolutionary history, mainly isolated from other savannas for much of its past, with currently unresolved ecological implications. Here we assess the biomass and floristic diversity of this savanna. We established four 25 ha permanent sample plots at two savanna sites, inventoried all trees, and assessed shrub, forb and grass species and biomass, and characterised the soils. Total plant carbon stocks (aboveground and belowground) were only 6.5 ± 0.3 MgC/ha, despite precipitation of 1600 mm/yr. Over half the biomass was grass, with the remainder divided between trees and shrubs. The carbon stock of the system is mostly contained in the top layer of the soil (16.7 ± 0.9 MgC/ha in 0-20 cm depth). We identified 49 plant species (4 trees, 13 shrubs, 4 sedges, 17 forbs and 11 grass species), with an average species richness of 23 per plot. There is tree hyperdominance of Hymenocardia acida (Phyllanthaceae), and a richer herbaceous species composition dominated by Loudetia simplex and Hyparrhenia diplandra. The low carbon stocks and tree biodiversity, compared to other African savannas, is surprising considering the high rainfall. We speculate it is due to low nutrient soils, high fire frequency and the effect of a temporally variable and restricted connection to the main southern African savanna complex.
FIGURE 10 in Floristic composition, life forms and phytogeography of the mountains between Damghan and Shahrud, Eastern Alborz (Iran)
FIGURE 10 (continued). Therophytes. G: Chrozophora tinctoria, H: Euphorbia szovitsii, I: Glaucium elegans, J: Hyoscyamus pusillus, K: Lamium amplexicaule, L: Trigonella monantha.
FIGURE 10. Therophytes. A in Floristic composition, life forms and phytogeography of the mountains between Damghan and Shahrud, Eastern Alborz (Iran)
FIGURE 10. Therophytes. A: Adonis aestivalis, B: Alyssum turkestanicum, C: Arnebia fimbriopetala, D: Asperula arvensis, E: Astragalus stalinskyi, F: Ceratocephala falcata.
FIGURE 8. Chamaephytes. A in Floristic composition, life forms and phytogeography of the mountains between Damghan and Shahrud, Eastern Alborz (Iran)
FIGURE 8. Chamaephytes. A: Acantholimon erinaceum, B: Acanthophyllum brevibracteatum, C: Acanthophyllum elatius, D: Acanthophyllum korshinsky, E: Astragalus chiwensis, F: Astragalus chrystostachys.
FIGURE 7 in Floristic composition, life forms and phytogeography of the mountains between Damghan and Shahrud, Eastern Alborz (Iran)
FIGURE 7 (continued). Hemicryptophytes. S: Ranunuculus crymophilus, T: Taraxacum brevirostre, U: Taraxacum oliganthum, V: Taraxacum serotinum, W: Trifolium pratense, X: Veronica kurdica.
FIGURE 1 in Floristic composition, life forms and phytogeography of the mountains between Damghan and Shahrud, Eastern Alborz (Iran)
FIGURE 1. The map of the studied area, mountains between Damghan and Shahrud including Gavkoshan, Karkasi, Chaloei and Shahvar Mts. The squares show the main locations of plant sampling during the 10-year fieldwork.
FIGURE 6 in Floristic composition, life forms and phytogeography of the mountains between Damghan and Shahrud, Eastern Alborz (Iran)
FIGURE 6 (continued). Examples of the Irano-Turanian Endemics. S: Ranunculus elbursensis, T: Rindera bungei, U: Silene demawendica, V: Tanacetum tenuisectum, W: Tragopogon porphyrocephalus, X: Veronica aucheri.
FIGURE 7 in Floristic composition, life forms and phytogeography of the mountains between Damghan and Shahrud, Eastern Alborz (Iran)
FIGURE 7 (continued). Hemicryptophytes. M: Gnaphalium supinum, N: Jurinella microcephala, O: Linaria pyramidalis, P: Potentilla bungei, Q: Potentilla polyschista, R: Pseudosedum multicaule.
FIGURE 6 in Floristic composition, life forms and phytogeography of the mountains between Damghan and Shahrud, Eastern Alborz (Iran)
FIGURE 6 (continued). Examples of the Irano-Turanian Endemics. M: Corydalis chionophila, N: Cousinia shahvarica, O: Jurinea boreoiranica, P: Linaria michauxii, Q: Myopordon hyrcanum, R: Onobrychis gaubae.
FIGURE 7 in Floristic composition, life forms and phytogeography of the mountains between Damghan and Shahrud, Eastern Alborz (Iran)
FIGURE 7 (continued). Hemicryptophytes. G: Dianthus crossopetalus, H: Didymophysa aucheri, I: Dielsiocharis kotschyi, J: Dracocephalum aucheri, K: Echinops chorassanicus, L: Erysimum caespitosum.
FIGURE 7. Hemicryptophytes. A in Floristic composition, life forms and phytogeography of the mountains between Damghan and Shahrud, Eastern Alborz (Iran)
FIGURE 7. Hemicryptophytes. A: Androsace villosa, B: Astragalus dactylocarpus, C: Astragalus masenderanus, D: Cerastium purpurascens, E: Corydalis rupestris, F: Cousinia smirnowii.
FIGURE 9. Geophytes. A in Floristic composition, life forms and phytogeography of the mountains between Damghan and Shahrud, Eastern Alborz (Iran)
FIGURE 9. Geophytes. A: Allium barsczewskii, B: Allium cristophii, C: Allium scabriscapum, D: Asparagus breslerianus, E: Berula erecta, F: Gagea alexeenkoana.
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