A study on the species diversity of weeds community of vegetable plot ecosystem during winter in Xiangtan suburb
0
Citation
0
Reference
20
Related Paper
Abstract:
The species diversity of weeds community of vegetable ecosystem is high in Xiangtan suburb fallow during winter season. Based on the total of the plots ,18 species which belong in 10 family, 15 genus were found. The result of diversity index is: the richness index is 9-15; the Simpson index is 0 6401-0 7451; the Shannon-Wiener index is 1 4852-1 7000; the evenness index is 0 5791-0 7145.The results show that the farther the vegetable plot is from city, the higher the species diversity is.Keywords:
Diversity index
Cite
The grasshopper communities in the paddy field, dry land, natural forest, and plantation forest of lac plantation-farmland ecosystem in Lvchun County, Yunnan were investigated by sweep netting. A total of 1426 grasshoppers belonging to 33 species, 22 genena, and 5 families were captured. In the paddy field, dry land, natural forest, and plantation forest of the ecosystem, the species richness S were 16.333, 13.000, 11.000, and 12.000, Margalef index was 2.873, 2.266, 2.335, and 2. 137, Shannon-Wiener index was 2.034, 1.976, 1.982, and 1.488, Simpson index was 0.196, 0.189, 0.174, and 0.323, and Pielou index was 0.728, 0.787, 0.829, 0.599, respectively. This ecosystem had a lower diversity of grasshopper communities, and different land use habitats in the ecosystem had different species component and diversity. In paddy field, grasshopper had a higher diversity than in dry land, but its evenness and stability were moderate; in natural forest, the diversity was high and the stability was strong; while in plantation forest, the diversity was low and the stability was weak. There existed species exchange in different land use habitats in the ecosystem.
Diversity index
Grasshopper
Cite
Citations (2)
Flora
Cite
Citations (0)
Based on 30 plots 102 quadrats of plant communities investigation in Karamay,using the species diversity index,richness index,evenness index and dominance index,the plant community of the area was studied.The results indicated that:the structure of the plant communities is simple and the species are fewer,the plant communities diversity level is lower.The sequence of plant communities diversity index is:Populus euphratica﹥Tamarix﹥Haloxylon ammodendron﹥Reaumuria songarica﹥Phragmites australis﹥Anabasis﹥Salsola collina﹥Halocnemum strobilaceum﹥Suaeda glauce + Ephedra﹥Halostachys caspica.With the change of water and salinity,the species diversity shows the change trend: Arbor community﹥shrub community﹥herbage community.
Quadrat
Dominance (genetics)
Phragmites
Diversity index
Haloxylon ammodendron
Tamarix
Cite
Citations (0)
According to the different plant communities,the arbor,shrub,herb and liana plant layers were distinguished.Main plant community species diversity was studied along Taihu roadside in Wuxi Mashan National Tourist Holiday Resort,by using species richness index,Shannon-Wiener index,Simpson index and Pielou evenness index.The results showed as follows:(1)The four species diversity indices of the arbor layer and the shrub layer are interrelated.However the herb layer is different.(2)By artificial vegetation renovating,plant species diversity along the road has been more remarkably increased than non-restored spot,so that the roadsides have been protected and landscape improved.(3)The plant community in restored lake shoal has high community rate of coverage,but designed plant variety is single,so that it's species diversity is less than the non-restored.(4)Original plant community species diversity was most above average.Reasonable artificial restoration can increase biodiversity for original destroyed vegetation.(5)By several calculating methods of species diversity,the species diversity in an area can be objectively reflected.
Diversity index
Liana
Cite
Citations (1)
The vegetation of study area is broadly divided into four physiognomic units viz. forest, secondary forest, grasslands and artificial vegetation. Shannon's diversity index, species richness and species composition of the vegetation of study area has been worked out. A total of 944 plant species belonging to 510 genera and 130 families are reported from the study area. The diversity of the study area is 4.292. Plant species diversity in different concrete plant communities has also been determined. The species diversity of total forested area is 4.115. Among different forest stands sal forest exhibit maximum species diversity (H' = 3.530). The grasslands as a whole showed high diversity (H'=4.198) with maximum contribution of erect annual herbs. Mesic grassland show maximum species diversity (H' = 3.907) among different grassland communities. Shrubs contribute maximum to the species diversity in degenerated forest. Climbers contribute very less to the species diversity of all the communities. The study area harbours some of the rare and threatened species needing effective conservation measures. An attempt has been made to deduce the successional pattern and affinities among different plant communities.
Diversity index
Cite
Citations (0)
Plant Diversity
Cite
Citations (0)
Biodiversity is a function of the number of the any taxon present, the evenness with which the taxons are distributed (species evenness or family evenness) and the interaction component of richness and evenness. The present investigation was carried out to study the arthropod biodiversity in Horticulture ecosystem at RVS Agricultural College, Thanjavur, India. The farm lies between 10.6796° N latitude and 78.9194° E longitude with an altitude of 426.7M above MSL. The insect collections were done in both Agri-Horticultural crops (Maize, Castor, Thenai, Cotton, Mango, Sapota, Coconut, Guava and some weeds). In the study, a total of 39 fauna species (butterflies) were recorded in horticultural ecosystem under 39 genera, 14 families and 1 order were observed in the horticultural ecosystem. Among the insect families, the family Nymphalidae consists of many species followed by Noctuidae. It was also recorded a total of 11 species under the family Nymphalidae followed by Noctuidae (10 species). Among the different functional groups, a diversity of a herbivores and tourist was maximum and comprised of 27 species under herbivores and 13 species under tourists. Species richness and diversity index were calculated for comparison within weekly collection and to know the variance between lepidopteron species. It was concluded that the species richness of herbivores and tourist were found to be abundant during winter 2018 and summer 2019.
Diversity index
Cite
Citations (0)
Species diversity of the Yukeng forest communities in Xianju County of Zhejiang Province was determined and analyzed by using the index of species richness, species diversity and community evenness. The results are given below. The communities are mainly composed of evergreen tree species under favorable conditions. The species richness and species diversity index of the woody plants are obviously greater than those of the herbs. In terms of the community's vertical structure, the species richness and species diversity index of the second layer of the woody plants are much greater than those of the first layer. The third layer of the woody plants is the greatest in relation to species richness while the herb layer is the smallest. If the species diversity index and community evenness are concerned,the second layer of woody plants is the greatest while the herb layer the smallest. The diversity indices of various la yers of the woody plants and the herb layer are to a certain degree different among the plots.
Diversity index
Gamma diversity
Cite
Citations (1)
This paper studied the species diversity of forest communities in Lingnan Natural Reserve by the investigated species richness index,species diversity index and species evenness index in 4 types of the communities.The results showed that the communities restored by nature had plenty of plant species,even distribution and non-obviously dominant species;the stand restored by human had less species diversities and obviously dominant species.Species diversity indexes of different layers in the forest stands were as follows: shrub layer tree layerherb layer.
Diversity index
Cite
Citations (1)