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61 results for “Herbaceous communities”
Herbaceous Community Composition in CRUI Land Use Project at Harvard Forest 1996
Patterns of vascular plant species richness were investigated in six land use legacy sites (2 formerly plowed, 2 formerly pastured, and 2 permanent woodlot) in Prospect Hill to test predictions about the effects of disturbance, light and soil resources, and forest floor environmental heterogeneity on community composition. The occurrence of vascular taxa was recorded in each of the 60 5 m x 5 m contiguous plots within the 30 m x 50 m permanently gridded study plot in each land use legacy site in June 1996. Identification was made to species in most cases. Woodlots showed higher average species richness at the site level (53) than either pastured (52 species) or plowed (49) sites. However woodlots also show greater spatial variation in richness at the 5 m x 5 m resolution than either the plowed or pastured sites (in that order) as represented by the range, standard deviation, and coefficient of variation. Seasonally-averaged light levels at 50 cm are approximately twice as high in the plowed and pastured sites as in the woodlots, but the woodlots show significantly greater soil organic matter, carbon, nitrogen and water-holding capacity than the post-agricultural sites. These results suggest that soil resources may be more important than light in fostering higher herbaceous stratum richness. However, woodlot richness is also affected by the presence of taxa that are slow to re-colonize heavily disturbed sites (e.g., Epigaea repens) and to distinctive microsites that are less common in the plowed or pastured sites in the Harvard Forest system (e.g., exposed boulders). The greater spatial variation in woodlot richness is strongly influenced by both substrate diversity and by scattered hemlock trees, which substantially depress the herb stratum in localized patches.
Herbaceous Vegetation Survey:Effects of Long Term Fertilization and Oak Canopy Cover on Plant Communities and Ecosystem Processes
In 1996 E142 was established in field D on top of the E004 macroplots. E004 was conducted in fields A, B, C and D by Dave Tilman. The purpose of E004 was to see what effect NH4NO3 addition has on large areas over a longer period of time with exposure to naturally-occurring levels of herbivory. The nutrient addition treatments in E004, E142 plots have been applied annually since 1982. These experiments, along with others at Cedar Creek, examine the community and ecosystem consequences of chronic nutrient loading.
Data from "Grassland woody plant management rapidly changes woody vegetation persistence and abiotic habitat conditions but not herbaceous community composition"
These files contain microhabitat, soil, vegetation structure, and woody plant species data used in the paper "Grassland woody plant management rapidly changes woody vegetation persistence and abiotic habitat conditions but not herbaceous community composition". The project was conducted at seven publicly accessible remnant (i.e., unplowed or old-growth) tallgrass prairie within 100 miles of Madison, Wisconsin, United States starting in the 2020 growing season and commencing following the 2022 growing season. The goal was to assess the initial effects of different management interventions on woody vegetation persistence, abiotic habitat conditions, and herbaceous community composition, including physical and chemical management interventions and their combination.
Opposing community assembly patterns for dominant and non-dominant plant species in herbaceous ecosystems globally
<p>Biotic and abiotic factors interact with dominant plants —the locally most frequent or with the largest coverage— and non-dominant plants differently, partially because dominant plants modify the environment where non-dominant plants grow. For instance, if dominant plants compete strongly, they will deplete most resources, forcing non-dominant plants into a narrower niche space. Conversely, if dominant plants are constrained by the environment, they might not exhaust available resources but instead may ameliorate environmental stressors that usually limit non-dominants. Hence, the nature of interactions among non-dominant species could be modified by dominant species. Furthermore, these differences could translate into a disparity in the phylogenetic relatedness among dominants compared to the relatedness among non-dominants. By estimating phylogenetic dispersion in 78 grasslands across five continents, we found that dominant species were clustered (e.g., co-dominant grasses), suggesting dominant species are likely organized by environmental filtering, and that non-dominant species were either randomly assembled or overdispersed. Traits showed similar trends for those sites (<50%) with sufficient trait data. Furthermore, several lineages scattered in the phylogeny had more non-dominant species than expected at random, suggesting that traits common in non-dominants are phylogenetically conserved and have evolved multiple times. We also explored environmental drivers of the dominant/non-dominant disparity. We found different assembly patterns for dominants and non-dominants, consistent with asymmetries in assembly mechanisms. Among the different postulated mechanisms, our results suggest two complementary hypotheses seldom explored: (1) Non-dominant species include lineages adapted to thrive in the environment generated by dominant species. (2) Even when dominant species reduce resources to non-dominant ones, dominant species could have a stronger positive effect on some non-dominants by ameliorating environmental stressors affecting them, than by depleting resources and increasing the environmental stress to those non-dominants. These results show that the dominant/non-dominant asymmetry has ecological and evolutionary consequences fundamental to understand plant communities.</p>
Survey of herbaceous communities in St Martin de Londres basin
<p>The repository documents the composition of mediterranean herbaceous communities obtained from a survey of 12 sites in St Martin de Londres basin, south of France. It also provides measures of sites environmental condition. Plant sampling took place in 2010 and is described in Ehlers et al. (<a href="https://doi.org/10.1111/1365-2745.12171">10.1111/1365-2745.12171</a>). The design involves quadrats with and without wild thyme in each site. The 12 csv files with four-letter names provides species-per-quadrat presence (1) -absence (0) data derived from this sampling. For some plant species, the percentage of cover in quadrats is available (numbers above 1). The envData.csv file contains environmental data independently obtained in a set of sites of St Martin de Londres basin in 2013, some of them matching the plant survey sites.</p>
Fig. 9 in Phenology And Population Structure Of Forest Herbaceous Species In Artificial And Natural Communities In The Steppe Zone Of Ukraine
Fig. 9. Influence of monthly average temperatures on date of flowering onset: Helleborus caucasica (1), Anemonoides nemorosa (2), Ficaria verna (3), Corydalis solida (4), Gymnospermum odessanum (5), C. marshalliana (6), Viola odorata (7), Anemonoides ranunculoides (8). See explanations in the text.
Fig. 12 in Phenology And Population Structure Of Forest Herbaceous Species In Artificial And Natural Communities In The Steppe Zone Of Ukraine
Fig. 12. Dependence of variability of the date (expressed by coefficient of variation) of flowering onset onto its average value (a) and amplitude of variations of monthly average temperatures (b) for 7 years of observations.
Fig. 4 in Phenology And Population Structure Of Forest Herbaceous Species In Artificial And Natural Communities In The Steppe Zone Of Ukraine
Fig. 4. The age structure of populations in artificial plant community: a – association of Glechoma hederaceae L. + Pulmonaria obscura (1) + Viola odorata + Lysimachia nummularia L.; association Pulmonaria obscura + Viola odorata + Viola alba + Primula veris (2); b – association of Hepatica nobilis (3) + Anemonoides blanda (4) + Viola odorata + Ficaria verna (5).
Fig. 5 in Phenology And Population Structure Of Forest Herbaceous Species In Artificial And Natural Communities In The Steppe Zone Of Ukraine
Fig. 5. The age structure of populations of spring ephemeroids in 2011–2012; a – Corydalis solida, b – Anemonoides ranunculoides, c – A. blanda.
Fig. 11 in Phenology And Population Structure Of Forest Herbaceous Species In Artificial And Natural Communities In The Steppe Zone Of Ukraine
Fig. 11. Dependence of flowering phenophase-starting date onto precipitation in forest herbaceous perennials. a: Anemonoides nemorosa (1), Corydalis marshalliana (2), Anemonoides ranunculoides (3), Gymnospermum odessanum (4), Viola odorata (5), Anemonoides blanda (6). b: Anemona sylvestris (7), November precipitation; Hepatica nobilis (8), July precipitation; Hepatica nobilis (9), January precipitation; Anemona sylvestris previous year July precipitation (10)".
Fig. 3 in Phenology And Population Structure Of Forest Herbaceous Species In Artificial And Natural Communities In The Steppe Zone Of Ukraine
Fig. 3. The age structure of populations in artificial plant community: a – association of Ficaria verna (1) + Corydalis solida (2) + Viola odorata + Anemonoides blanda (3) + Anemonoides ranunculoides, b – Corydalis paczoskii (5)" - "Corydalis paczoskii (4)"; "Gymnospermium odessanum (6)" – "Gymnospermium odessanum (5)".
Fig. 6 in Phenology And Population Structure Of Forest Herbaceous Species In Artificial And Natural Communities In The Steppe Zone Of Ukraine
Fig. 6. The age structure of populations in natural plant community: a – association of Corydalis solida (1) + Anemonoides ranunculoides (2) + Ficaria verna (3) + Corydalis marschalliana (4); b –Association Ficaria verna (5) + Corydalis solida (6) + Viola odorata + Fragaria vesca.
Fig. 7 in Phenology And Population Structure Of Forest Herbaceous Species In Artificial And Natural Communities In The Steppe Zone Of Ukraine
Fig. 7. The age structure of populations of spring ephemeroids under artificial plant community conditions (1) and natural ravine forest (2): a – Corydalis solida, b – Ficaria verna, c – Anemonoides ranunculoides.
Fig. 1 in Phenology And Population Structure Of Forest Herbaceous Species In Artificial And Natural Communities In The Steppe Zone Of Ukraine
Fig. 1. The age structure of populations in artificial plant community: a – association of Ficaria verna (1) + Anemonoides blanda (2) + Corydalis solida (3), b – "Ficaria verna (3)" to "Ficaria verna (4)"; "Anemonoides blanda (4)" - "Anemonoides blanda (5)"; "Corydalis solida (5)" – "Corydalis solida (6)".
Fig. 10 in Phenology And Population Structure Of Forest Herbaceous Species In Artificial And Natural Communities In The Steppe Zone Of Ukraine
Fig. 10. Influence of January-April total precipitation value on the date of Primula veris budding onset.
Fig. 2 in Phenology And Population Structure Of Forest Herbaceous Species In Artificial And Natural Communities In The Steppe Zone Of Ukraine
Fig. 2. The age structure of populations in artificial plant community: a - association Anemonoides ranunculoides (1) + Corydalis solida (2) + Corydalis marschalliana, b - association Ficaria verna (3) + Anemonoides ranunculoides (4) + Anemonoides nemorosa, (5) + Corydalis solida (6).
Dry perennial herbaceous community data of Castril, Santiago and Pontones high-altitude rangelands in Andalusia (Spain)
<p>Data generated from vegetation monitoring in Castril, Santiago and Pontones rangelands situated in Sierra de Segura and Sierra de Castril in North-Eastern Andalusia (Spain).</p> <p>These data and R Script are linked to the article <em>How transhumance and pastoral commons shape plant community structure and composition. </em></p> <p>The plant community sampled belongs to <em>Festuco hystricis-Ononidetea striatae</em> class, consisting of <em>Coronillo minimae-Astragaletum nummularioidis</em> and <em>Seseli granatensis-Festucetum hystricis</em> plant associations. Plant data community consists in 72 vegetation transects. For further details see the article or contact S.A. Parra (santiago.parra-bulacio@etu.univ-amu.fr).</p> <p>File “Read_me.txt” details the databases and R script published.</p>
Text-fig. 10. Reconstruction of environment with herbaceous angiosperms from deposits of the Frentsevka Formation. in An Angiosperm Dominated Herbaceous Community From The Early - Middle Albian Of Primorye, Far East Of Russia
Text-fig. 10. Reconstruction of environment with herbaceous angiosperms from deposits of the Frentsevka Formation.
Text-fig. 8. Plant fossils from Primorye, Partizansk coal basin, Frentsevka Formation, Bolshoy Kuvshin locality, early – middle Albian. a – undetermined species, spec. IBSS 320-137; b, c – Asiatifolium elegans G.SUN, S.X.GUO et SHAO L.ZHENG: b – spec. IBSS 320-86, c – spec. IBSS 320-8. Scale bar 0.5 cm. in An Angiosperm Dominated Herbaceous Community From The Early - Middle Albian Of Primorye, Far East Of Russia
Text-fig. 8. Plant fossils from Primorye, Partizansk coal basin, Frentsevka Formation, Bolshoy Kuvshin locality, early – middle Albian. a – undetermined species, spec. IBSS 320-137; b, c – Asiatifolium elegans G.SUN, S.X.GUO et SHAO L.ZHENG: b – spec. IBSS 320-86, c – spec. IBSS 320-8. Scale bar 0.5 cm.
Text-fig. 1. Map of Primorye region with early angiosperm localities near Bolshoy Kamen, Partizansk and Jixi. in An Angiosperm Dominated Herbaceous Community From The Early - Middle Albian Of Primorye, Far East Of Russia
Text-fig. 1. Map of Primorye region with early angiosperm localities near Bolshoy Kamen, Partizansk and Jixi.
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