scholarly journals Vegetation Community Characteristics Under Different Vegetation Eco-restoration Techniques at Xiangjiaba Hydropower Station

2021 ◽  
Vol 20 (4) ◽  
Author(s):  
B.Q. Zhao ◽  
R.Z. Gao ◽  
D. Xia ◽  
L. Xia ◽  
W.Q. Zhu ◽  
...  
Keyword(s):  
Community Structure ◽  
Species Composition ◽  
Leucaena Leucocephala ◽  
Base Material ◽  
Thick Layer ◽  
Vegetation Coverage ◽  
Community Characteristics ◽  
Vegetation Community ◽  
Restoration Technique ◽  
Control And Management

The objective of this study is to understand the characteristics of vegetation communities under different vegetation eco-restoration models (vegetation concrete eco-restoration technique, frame beam filling soil technique, thick layer base material spraying technique, and external soil spray seeding technique). Vegetation coverage, dominant species, species composition, and species diversity of vegetation community under different vegetation eco-restoration modes were analyzed by field survey. The vegetation community of the abandoned slag slope was unstable due to the simple vegetation community structure. The species and number of the thick layer base material spraying slope were low and fail to form a healthy multilayer community structure due to invade of Leucaena leucocephala (Lam.) de Wit. Studying the allelopathy of Leucaena leucocephala (Lam.) de Wit and seeking the best species composition that can coexist with it is significant to promote the positive succession of the vegetation community. The frame beam filling soil technique, external-soil spray seeding technique, and vegetation concrete eco-restoration technique can effectively promote the succession process of the vegetation community and have well water and soil conservation capacity. These findings suggest that artificial vegetation eco-restoration measures can effectively promote vegetation eco-restoration and the positive succession of vegetation community of disturbed slopes. The research results can provide scientific advice for vegetation eco-restoration and subsequent control and management of disturbed slopes in the Xiangjiaba project, and also can be helpful to other similar projects.

scholarly journals Vegetation Response to Goats Grazing Intensity in Semiarid Hilly Grassland of the Loess Plateau, Lanzhou, China

2021 ◽  
Vol 13 (6) ◽  
pp. 3569
Author(s):  
Hua Cheng ◽  
Baocheng Jin ◽  
Kai Luo ◽  
Jiuying Pei ◽  
Xueli Zhang ◽  
...  
Keyword(s):  
Growth Rate ◽  
Community Structure ◽  
Plant Growth ◽  
Loess Plateau ◽  
Grazing Intensity ◽  
Gps Tracking ◽  
Growth Stages ◽  
The Loess Plateau ◽  
Vegetation Community ◽  
Natural Grasslands

Quantitatively estimating the grazing intensity (GI) effects on vegetation in semiarid hilly grassland of the Loess Plateau can help to develop safe utilization levels for natural grasslands, which is a necessity of maintaining livestock production and sustainable development of grasslands. Normalized difference vegetation index (NDVI), field vegetation data, and 181 days (one goat per day) of GPS tracking were combined to quantify the spatial pattern of GI, and its effects on the vegetation community structure. The spatial distribution of GI was uneven, with a mean value of 0.50 goats/ha, and 95% of the study area had less than 1.30 goats/ha. The areas with utilization rates of rangeland (July) lower than 45% and 20% made up about 95% and 60% of the study area, respectively. Grazing significantly reduced monthly aboveground biomass, but the grazing effects on plant growth rate were complex across the different plant growth stages. Grazing impaired plant growth in general, but the intermediate GI appeared to facilitate plant growth rate at the end of the growing seasons. Grazing had minimal relationship with vegetation community structure characteristics, though Importance Value of forbs increased with increasing GI. Flexibility in the number of goats and conservatively defining utilization rate, according to the inter-annual variation of utilization biomass, would be beneficial to achieve ecologically healthy and economically sustainable GI.

scholarly journals KOMUNITAS MAKRO ALGA DI PERAIRAN PANTAI ERI TELUK AMBON

2019 ◽  
Vol 15 (1) ◽  
pp. 40-45
Author(s):  
Frijona F Lokollo
Keyword(s):  
Community Structure ◽  
Species Composition ◽  
Relative Frequency ◽  
Occurrence Frequency ◽  
Frequency Of Occurrence ◽  
Gracilaria Salicornia ◽  
Turbinaria Ornata ◽  
Belt Transect ◽  
Macro Algae

This research was conducted in Eri Beach, Ambon Bay on November 2016 to study community structure which consist of species composition, density and occurrence frequency of macro algae.  Sample of macro algae was collected by using belt transect method.  The results showed that there were 11 species of macro algae in the area which were belonged to 11 genera, 9 families, 8 orders, 3 classes and 3 divisions. Those species were Halimeda opuntia and Caulerpa serrulata (Chlorophyta), Padina minor and Turbinaria ornata (Phaeophya), Amphiroa rigida, Galaxaura rugosa, Ceratodictyon spongiosum, Gracilaria Salicornia, Laurencia papillosa, Acanthophora muscoides and Halymenia durvillaei (Rhodophyta). The highest density was represented by Amphiroa rigida (2.02 ind/m2) while the highest relative frequency of occurrence belonged to Padina minor (27%). Keywords : Community, macro algae, density, Eri, Ambon Bay   ABSTRAK Penelitian ini bertujuan untuk mengetahui struktur komunitas makro alga meliputi komposisi jenis, frekuensi kehadiran serta kepadatan di Pantai Eri. Penelitian dilakukan pada bulan November 2016. Stasiun pengamatan makro alga yaitu di perairan pantai Eri. Metode sampling menggunakan Belt Transect. Hasil penelitian ditemukan 11 spesies, 11 genus, 9 famili, 8 ordo, 3 kelas dan 3 devisi. Chlorophyta terdiri dari Halimeda opuntia dan Caulerpa serrulata. Phaeophya terdiri dari Padina minor dan Turbinaria ornata. Rhodophyta terdiri dari Amphiroa rigida, Galaxaura rugosa, Ceratodictyon spongiosum, Gracilaria Salicornia, Laurencia papillosa, Acanthophora muscoides dan Halymenia durvillaei. Kepadatan jenis tertinggi spesies A. rigida (2.02 ind/m2) dan frekuensi kehadiran relatif tertinggi spesies Padina minor (27%).

Community structure of psammon ciliates in sandy beaches of lakes

2013 ◽  
Vol 42 (1) ◽  
Author(s):  
Krystyna Kalinowska
Keyword(s):  
Community Structure ◽  
Species Composition ◽  
Chlorophyll A ◽  
Total Nitrogen ◽  
Trophic Status ◽  
Sandy Beaches ◽  
Significant Part ◽  
Lake Productivity ◽  
Ciliate Community ◽  
Positive Correlations

AbstractCiliate abundance and species composition were studied in the sandy beaches of six lakes of different trophic status (Poland). Samples of wet sand were taken in June 2007 from the euarenal (emergent sand), hygroarenal (sand wetted by lake waves) and hydroarenal (submerged sand) zones. The numbers of ciliates ranged from 105 to 2933 ind. cm−3 of sand and did not show any visible trend with lake productivity. In all the studied lakes, ciliates were much more numerous in the euarenal than in the hydroarenal. Small bacterivorous scuticociliates dominated in the euarenal, while Hymenostomatida, Cyrtophorida, Hypotrichida as well as Scuticociliatida comprised a significant part of the ciliate community in the hygro- and hydroarenal zones. There were positive correlations between ciliates and the concentrations of chlorophyll a and total nitrogen.

Corrigendum to: Fish in the matrix: effects of landscape on community-structure patterns of the ichthyofauna of streams in Cerrado

2020 ◽  
Vol 71 (9) ◽  
pp. 1219
Author(s):  
Thiago Bernardi Vieira ◽  
Leandro Schlemmer Brasil ◽  
Naiara Raiol Torres ◽  
Tatiana Lima de Melo ◽  
Elto Aparecido Moreira ◽  
...  
Keyword(s):  
Land Use ◽  
Species Richness ◽  
Community Structure ◽  
Species Composition ◽  
Indicator Species ◽  
Matrix Effects ◽  
Native Vegetation ◽  
Generalist Species ◽  
The Matrix ◽  
Structure Patterns

This study aims to identify species richness and composition patterns of the ichthyofauna in different landscape matrices (forest, pasture and eucalypt crops) and to evaluate the variation of species composition in different matrices, identifying possible indicator species. We selected 21 streams; 7 were surrounded by native vegetation, 9 surrounded by pasture and 5 by eucalypt crops. We tested whether there was difference in the composition and species richness. In addition, we used the indicator value (IndVal) to verify if there were species faithful and specific to some land use and land cover. Streams located in forest presented the highest estimated species richness, followed by streams in pasturelands and eucalypt matrices. There was no difference between the composition of fishes in different matrices, but we observed a relationship between Phenacorhamdia somnians (Mees, 1974) and pasture matrix. The results indicated that the change in land use may benefit some generalist species such as Phenacorhamdia somnians.

Fish in the matrix: effects of landscape on community-structure patterns of the ichthyofauna of streams in Cerrado

2020 ◽  
Vol 71 (9) ◽  
pp. 1211 ◽  
Author(s):  
Thiago Bernardi Vieira ◽  
Leandro Schlemmer Brasil ◽  
Naiara Raiol Torres ◽  
Tatiana Lima de Melo ◽  
Elto Aparecido Moreira ◽  
...  
Keyword(s):  
Land Use ◽  
Species Richness ◽  
Community Structure ◽  
Species Composition ◽  
Indicator Species ◽  
Matrix Effects ◽  
Native Vegetation ◽  
Generalist Species ◽  
The Matrix ◽  
Structure Patterns

This study aims to identify species richness and composition patterns of the ichthyofauna in different landscape matrices (forest, pasture and eucalypt crops) and to evaluate the variation of species composition in different matrices, identifying possible indicator species. We selected 21 streams; 7 were surrounded by native vegetation, 9 surrounded by pasture and 5 by eucalypt crops. We tested whether there was difference in the composition and species richness. In addition, we used the indicator value (IndVal) to verify if there were species faithful and specific to some land use and land cover. Streams located in forest presented the highest estimated species richness, followed by streams in pasturelands and eucalypt matrices. There was no difference between the composition of fishes in different matrices, but we observed a relationship between Phenacorhamdia somnians (Mees, 1974) and pasture matrix. The results indicated that the change in land use may benefit some generalist species such as Phenacorhamdia somnians.

scholarly journals Zooplankton community structure in the Yellow Sea and East China Sea in autumn

2015 ◽  
Vol 63 (4) ◽  
pp. 455-468 ◽  
Author(s):  
Hongju Chen ◽  
Guangxing Liu
Keyword(s):  
Community Structure ◽  
Species Composition ◽  
East China Sea ◽  
Yellow Sea ◽  
Zooplankton Community ◽  
The Yellow Sea ◽  
East China ◽  
Taxonomic Distinctness ◽  
Zooplankton Community Structure ◽  
China Sea

Abstract Study on zooplankton spatial distribution is essential for understanding food web dynamics in marine ecosystems and fishery management. Here we elucidated the composition and distribution of large mesozooplankton on the continental shelf of the Yellow Sea and East China Sea, and explored the zooplankton community structure in these water masses. Sixty vertical hauls (bottom or 200 m in deep water to surface) using a ring net (diameter 0.8 m, 505-μm mesh) were exploited in November 2007. The biogeographic patterns of zooplankton communities were investigated using multivariate analysis methods; copepod biodiversity was analyzed using univariate indices. Copepods and protozoans were dominate in the communities. Based on the species composition, we divided the study areas into six station groups. Significant differences in zooplankton assemblages were detected between the Yellow Sea and East China Sea. Species richness was higher in East China Sea groups than those in Yellow Sea, whereas taxonomic distinctness was higher in Yellow Sea than in East China Sea. There was a clear relationship between the species composition and water mass group.

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