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Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values Gayana Botánica
Alvarez,Miguel; Mõseler,Bodo Maria; San Martín,Cristina.
The use of mean value for the analysis of Ellenberg indicator values in plots or plant community types has been criticised by several authors. On the other hand, little attention has been paid to distribution patterns of the respective classes frequencies. Herewith we make a revision of metrics available for the characterization of tendency and distribution patterns of ordinal variables, like in the case of Ellenberg indicator values, and discuss their relation to frequency histogram shapes. We selected three tendencies (mean value, median value and mode) and two distribution metrics (position index and relative dominance). Additionally, we proposed a concentration index, which is analogous to the contagion index commonly used by landscape ecologists....
Tipo: Journal article Palavras-chave: Bio-indicators; Ecological monitoring; Grassland vegetation; Species composition.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200006
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モンゴル草本植物のフェノロジーとバイオマスの年々変動 OAK
近藤, 昭彦; 開發, 一郎; 平田, 昌弘; ドルゴスレン, アザヤ; KONDOH, Akihiko; KAIHOTSU, Ichirow; HIRATA, Masahiro; DORGORSUREN, Azzaya.
http://www.jaals.net/学会誌バックナンバー-投稿規定/
Palavras-chave: Mongolia; Grassland vegetation; Phenology; Biomass.
Ano: 2005 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3269
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Seasonal dynamics of vegetation indices as a criterion for grouping grassland typologies Scientia Agricola
Moreira,Andreise; Bremm,Carolina; Fontana,Denise Cybis; Kuplich,Tatiana Mora.
ABSTRACT: This study aimed to characterize the average seasonal pattern of the vegetation in southern grassland in Brazil, and the variability found in the time series of vegetation indices. It also sought to identify similarities in the seasonal pattern of different grassland typologies. Moderate Resolution Imaging Spectroradiometer (MODIS), Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) images from Feb to Dec, 2000 to 2014 were analyzed for ten regions. The grassland typologies studied showed EVI and NDVI profiles consistent with the seasonal dynamics of grassland vegetation under the influence of a subtropical climate, with highest values in the indices during the warm seasons of the year (spring and summer) and lowest...
Tipo: Info:eu-repo/semantics/article Palavras-chave: MODIS; EVI; NDVI; Phenology; Grassland vegetation.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100024
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Development of a functional approach in a grassland vegetation - DOI: 10.4025/actascianimsci.v30i2.4679 Animal Sciences
Sosinski Junior, Enio Egon; UFRGS; Carrère, Pascal; Institut National de la Recherche Agronomique; Louault, Frédérique; Institut National de la Recherche Agronomique; Soussana, Jean-François; Institut National de la Recherche Agronomique.
To improve our understanding of grassland dynamics under different levels of utilization, a functional description of the vegetation was introduced in a deterministic model. The selected traits and their parameterization were based on the results of a long-term experiment in which temperate grasslands were managed for 12 years with three levels of herbage use: high, medium and low. The integration of functional attributes of the community species within the model’s parameters can be seen as a new step in the study of the grassland ecosystem. With this tool, it is possible to decrease the number of interconnections in the system and consequently decrease the complexity. In this work a, functional definition of three different grassland communities was...
Palavras-chave: 5.04.04.00-8 Pastagem e Forragicultura extensification; Grassland vegetation; Models; Simulation; Functional attributes; Vegetation communities..
Ano: 2008 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/4679
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