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A Classification for a Geostatistical Index of Spatial Dependence Rev. Bras. Ciênc. Solo
Seidel,Enio Júnior; Oliveira,Marcelo Silva de.
ABSTRACT: In geostatistical studies, spatial dependence can generally be described by means of the semivariogram or, in complementary form, with a single index followed by its categorization to classify the degree of such dependence. The objective of this study was to construct a categorization for the spatial dependence index (SDI) proposed by Seidel and Oliveira (2014) in order to classify spatial variability in terms of weak, moderate, and strong dependence. Theoretical values were constructed from different degrees of spatial dependence, which served as a basis for calculation of the SDI. In view of the form of distribution and SDI descriptive measures, we developed a categorization for posterior classification of spatial dependence, specific to each...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Geostatistics; Spatial dependence; Spatial variability; Semivariogram; Summary measures.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100313
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A geostatistical method for assessing biomass of tuna aggregations around moored fish aggregating devices with star acoustic surveys ArchiMer
Doray, Mathieu; Petitgas, Pierre; Josse, E.
Universal kriging was used to model the spatio-temporal variability in the acoustic density of tuna aggregations recorded during star echosounding surveys around moored fish aggregating devices (FADs) in Martinique (Lesser Antilles). The large-scale deterministic drift in the tuna spatial distribution was modeled using an advection-diffusion equation applied to animal grouping. Residuals from the drift were modeled as a random component with small-scale spatial correlation. An estimation variance formula was derived from this deterministic-statistical mixed model to assess the mean precision of density estimates of daytime tuna aggregation. The mean relative error obtained with our star design for daytime surveys was 24%. The methodology was applied to...
Tipo: Text Palavras-chave: Acoustic survey precision; Advection diffusion model; Moored fish aggregating devices; Tuna; Geostatistics.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4559.pdf
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Agricultura de precisão em fruticultura. Infoteca-e
BASSOI, L. H.; MIELE, A.; REISSER JUNIOR, C.; GEBLER, L.; FLORES, C. A.; FILIPPINI ALBA, J. M.; GREGO, C. R.; TERRA, V. S. S.; TIMM, L. C.; NASCIMENTO, P. dos S..
Os sistemas de produção atualmente existentes na fruticultura brasileira caracterizam-se pela execução de diversas práticas agrícolas durante o ciclo da cultura, tendo como preocupação a quantidade e a qualidade da produção, e a rentabilidade da atividade agrícola. Nesse contexto, cria-se uma oportunidade para a aplicação de agricultura de precisão, como forma de auxiliar a gestão do sistema de produção e a tomada de decisão pelo produtor. Nesse capítulo, são apresentados quatro estudos de caso em que a realização de procedimentos e o uso de ferramentas, característicos de agricultura de precisão, permitem aos produtores e técnicos a compreensão da variabilidade de atributos do solo e da planta e de suas relações, bem como o estabelecimento de zonas...
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Geoestatística; Análise multivariada; Agricultura de precisao; Fruticultura; Viticultura; Estatística agrícola; Método estatístico; Maçã; Pêssego; Uva; Precision agriculture; Fruit growing; Viticulture; Geostatistics; Agricultural statistics; Multivariate analysis.
Ano: 2014 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1008274
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Alterations and spatial variability of soil fertility in successive years under no tillage system Bragantia
Chiba,Marcio Koiti; Vieira,Sidney Rosa; González,Antonio Paz; Dechen,Sonia Carmela Falci; Maria,Isabella Clerici de.
This study was carried out in order to assess the spatial variability of some soil properties after adoption of no tillage system (NTS). A 19,200 m² plot was marked with a 20 x 20 m spacing grid. Crop yield and soil attributes, at 0-0.2 m deep layer, were measured in 63 points in 1985, 1987 and 1988. The spatial variability was assessed by semivariogram calculation using geostatistics. Soil base saturation index (BS) was interpolated by kriging and also, using a bivariate geostatistical method, the collocated cokriging (CLCK) using terrain elevation as ancillary data. Although, the coefficient of variation (Cv) for soil organic matter content decreased from 1985 (20.4%) to 1988 (10.7%), its mean value increased 32% in the same period. The soil fertility in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Geostatistics; Kriging; Cokriging.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500005
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Amostragem de solo em plantio direto para aplicação em agricultura de precisão. Infoteca-e
CARVALHO, J. R. P. de.
O objetivo deste estudo seria a comparação das diversas técnicas estatísticas disponíveis, visando o estudo da amostragem de solo para plantio direto. Com a formação de bases de dados digitais e melhores métodos para coleção de dados e análise geoestatfstica, estudos mais detalhados podem ser realizados sobre a variação dos solos e suas conseqüências.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Pedometria; Amostragem de solo; Geoestatística; Pedometric.; Agricultura de Precisão; Plantio Direto.; Soil sampling; No-tillage; Geostatistics; Precision agriculture.
Ano: 1999 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/7537
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Analyzing spatial and temporal variability of soil water content Bragantia
Vieira,Sidney Rose; Grego,Célia Regina; Topp,George Clarke.
During the last two decades geoestatistical methods have been intensively used for in-depth descriptions of spatial variability. The objective of this study was to assess the spatial and temporal variability of soil water content. The measurements were taken with a TDR equipment to a 20 cm depth, in a nearly flat 1.2 ha field at the Central Experimental Farm of the Agriculture Canada, Ottawa. The soil classified as a Rideau soil series, is a clay loam soil. A square grid with 10 m spacing was laid out, resulting in 164 sampling points at which two TDR rods were installed to measure the water content down to 20 cm depth. Measurements were taken on 33 dates during the frost free months in 1987, 1988 and 1989. The spatial variability was analyzed examining...
Tipo: Info:eu-repo/semantics/article Palavras-chave: TDR; Temporal stability; Semivariogram; Geostatistics.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052008000200022
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Aplicação da geoestatística na análise da fertilidade do solo em propriedade familiar do Circuito das Frutas do Estado de São Paulo. Infoteca-e
GREGO, C. R.; PAIM, F. A. de P.; RODRIGUES, C. A. G.; CRISCUOLO, C.; GARCON, E. A. M.; MANJOLIN, R. C.; ALVAREZ, I. A.; ALBUQUERQUE, T. C. S. de.
Este trabalho tem como objetivo o uso da análise geoestatística no mapeamento da fertilidade do solo de seis propriedades familiares do Circuito das Frutas, localizadas nos municípios de Itatiba, Atibaia, Jundiaí, Valinhos, Indaiatuba, Jarinú, no estado de São Paulo.
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Geoestatística; Variabilidade espacial; Krigagem ordinária; Culturas frutíferas; Spatial variability; Ordinary kriging; Fruticultura; Fertilidade do Solo; Geostatistics; Fruit crops.
Ano: 2018 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1102129
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Aplicação dos conceitos geoestatísticos para o manejo da irrigação em videira no Vale do Submédio São Francisco. Infoteca-e
NASCIMENTO, P. S.; SILVA, J. A.; COSTA, B. R. S.; BASSOI, L. H..
A otimização na aplicação dos recursos hídricos constitui uma das preocupações da agricultura irrigada. Nesse sentido, esta pesquisa foi desenvolvida com o objetivo de aplicar o conceito de zonas homogêneas do solo para a realização do manejo diferenciado da irrigação em um pomar de videira. O experimento foi conduzido em área de produção comercial, localizada no Perímetro Irrigado Senador Nilo Coelho, em Petrolina-PE. Foi selecionada uma área com 40 fileiras de plantas e 82 plantas por fileira, em um pomar de videira cultivar Thompson Seedless sobre o porta-enxerto SO4, com 1 difusor por planta e conduzida no sistema de latada. Amostras de solo foram coletadas nas profundidades de 0,0-0,2 e 0,2-0,4 m para a determinação da curva de retenção de água no...
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Vale do São Francisco; Available soil water; Spatial dependence; Uva; Irrigação; Manejo; Vitis Vinifera; Grapes; Geostatistics.
Ano: 2014 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1008326
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ASPECTS OF THE SILVOPASTORAL SYSTEM CORRELATED WITH PROPERTIES OF A TYPIC QUARTZIPSAMMENT (ENTISOL) IN MATO GROSSO DO SUL, BRAZIL Rev. Bras. Ciênc. Solo
Corrêa,Adriany Rodrigues; Montanari,Rafael; Laura,Valdemir Antônio; Melotto,Alex Marcel; Silva,Evelize Nayara Santana da; Pellin,Douglas Martins Pereira; Santos,Anderson Secco dos.
In Brazil, grazing mismanagement may lead to soil and pasture degradation. To impede this process, integrated cropping systems such as silvopasture have been an effective alternative, allied with precision agriculture based on soil mapping for site-specific management. In this study, we aimed to define the soil property that best sheds light on the variability of eucalyptus and forage yield. The experiment was conducted in the 2011/12 crop year in Ribas do Rio Pardo, Mato Grosso do Sul State, Brazil. We analyzed linear and spatial correlations between eucalyptus traits and physical properties of a Typic Quartzipsamment at two depths (0.00-0.10 and 0.10-0.20 m). For that purpose, we set up a geostatistical grid for collection at 72 points. Gravimetric...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Geostatistics; Resistance to penetration; Soil management; Agricultural sustainability.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200438
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Availability and spatial variability of copper, iron, manganese and zinc in soils of the State of Ceará, Brazil Rev. Ciênc. Agron.
Oliveira,Mara Lucia Jacinto; Valladares,Gustavo Souza; Vieira,Johnston Silva; Coelho,Ricardo Marques.
ABSTRACT The aim of the present work was to: (i) determine and map the micronutrient content (copper - Cu, iron - Fe, manganese - Mn and zinc - Zn) in soils of the State of Ceará; (ii) evaluate soil attributes related to micronutrient availability; and (iii) evaluate, by ordinary kriging, the spatial dependence of the micronutrient content. The study area is located in the central region of Ceará, in the basin of the River Banabuiú. Soil samples were collected in the surface and subsurface layers to determine the chemical attributes, granulometry, and micronutrient content, extracted with Mehlich-1 solution. The sites of the principal types of soil in the region were spatialised and the results submitted to descriptive analysis and Pearson correlation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cationic micronutrients; Geostatistics; Ordinary kriging; Soils of the semi-arid region.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000300371
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Caracterização de sistemas agroflorestais com o uso de ferramentas de Geoestatística. Infoteca-e
AMARAL, E. F. do; OLIVEIRA, T. K. de; BARDALES, N. G.; ARAÚJO, E. A. de; OLIVEIRA, C. H. A. de; SILVA, D. V. da; MORENO, N. M. da C..
O objetivo do presente estudo foi estruturar e avaliar um procedimento metodológico para caracterizar a dependência espacial de variáveis das espécies componentes de sistemas agroflorestais com o uso de ferramentas de geoestatística, permitindo a comparação de diferentes arranjos por meio de indicadores espaciais.
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Sistema agroflorestal (SAF); Agroforestería; Peach palm; Nuez del Brasil; Castanha do brasil; Cubierta vegetal; Geoestadísticas; Projeto Reca; Nova Califórnia (RO); Rondônia; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Agrossilvicultura; Cobertura Vegetal; Cupuaçu; Theobroma Grandiflorum; Pupunha; Bactris Gasipaes; Castanha do Para; Bertholletia Excelsa; Dados Estatísticos; Agroforestry; Brazil nuts; Vegetation cover; Geostatistics.
Ano: 2018 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1091229
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CHANGE DETECTION IN BRAZILIAN SAVANNAS USING SEMIVARIOGRAMS DERIVED FROM NDVI IMAGES Ciência e Agrotecnologia
Acerbi Júnior,Fausto Weimar; Silveira,Eduarda Martiniano de Oliveira; Mello,José Márcio de; Mello,Carlos Rogério de; Scolforo,José Roberto Soares.
The Normalized Difference Vegetation Index (NDVI) is often used to extract information from vegetated areas since it is directly related to vegetation parameters such as percent of ground cover, photosynthetic activity of the plant and leaf area index. The aim of this paper was to analyze the potencial of semivariograms generated from NDVI values to detect changes in vegetated areas, analyzing their behavior (shape) and derived metrics (range, sill and nugget). Semivariograms were generated from NDVI values derived from Landsat TM images of May 2010, June 2010 and July 2011. The study area is located in the northern state of Minas Gerais, Brazil, and is covered by Brazilian savannas vegetation, totalizing 1,596 ha. Semivariograms were generated after the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Deforestation; Geostatistics; Remote sensing.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000200103
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Characterization of potential CO2 emissions in agricultural areas using magnetic susceptibility Scientia Agricola
Leal,Fábio Tiraboschi; França,Ana Beatriz Coelho; Siqueira,Diego Silva; Teixeira,Daniel De Bortoli; Marques Júnior,José; Scala Júnior,Newton La.
ABSTRACTSoil CO2 emissions (fCO2) in agricultural areas have been widely studied in global climate change research, but its characterization and quantification are restricted to small areas. Because spatial and time variability affect emissions, tools need to be developed to predict fCO2 for large areas. This study aimed to investigate soil magnetic susceptibility (MS) and its correlation with fCO2 in an agricultural environment. The experiment was carried out on a Typic Eutrudox located in Guariba-SP, Brazil. Results showed that there was negative spatial correlation between fCO2 and the magnetic susceptibility of Air Dried Soil (MSADS) up to 34.3 m distant. However, the fCO2 had no significant correlation with MSADS, magnetic susceptibility of sand...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Magnetism; Soil respiration; Spatial variability; Geostatistics.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600535
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Comparison of maps of spatial variability of soil resistance to penetration constructed with and without covariables using a spatial linear model REA
Bastiani,Fernanda de; Uribe-Opazo,Miguel A.; Dalposso,Gustavo H..
A study about the spatial variability of data of soil resistance to penetration (RSP) was conducted at layers 0.0-0.1 m, 0.1-0.2 m and 0.2-0.3 m depth, using the statistical methods in univariate forms, i.e., using traditional geostatistics, forming thematic maps by ordinary kriging for each layer of the study. It was analyzed the RSP in layer 0.2-0.3 m depth through a spatial linear model (SLM), which considered the layers 0.0-0.1 m and 0.1-0.2 m in depth as covariable, obtaining an estimation model and a thematic map by universal kriging. The thematic maps of the RSP at layer 0.2-0.3 m depth, constructed by both methods, were compared using measures of accuracy obtained from the construction of the matrix of errors and confusion matrix. There are...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Geostatistics; Maximum likelihood; Error matrix.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000200019
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Curso básico de geoestatística utilizando o VESPER. Infoteca-e
EMBRAPA INFORMÁTICA AGROPECUÁRIA..
A geoestatística, que possui grande aplicação no projeto em rede de Agricultura de Precisão da Embrapa, é uma ferramenta que permite detectar a existência de dependência espacial e fazer o mapeamento de dados agropecuários. Com isso, contribui na geração de tecnologias, produtos e processos de Agricultura de Precisão, para estimular sua adoção e auxiliar a tomada de decisão em sistemas produtivos. Com a incorporação do software computacional livre Vesper, que será utilizado durante o curso, é possível o uso da ferramenta numa interface amigável, segura e cientificamente comprovada na obtenção de resultados mais precisos da análise.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Geoestatística; Software Vesper; Geostatistics; Computer software.
Ano: 2012 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/948163
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Definition of management zones in coffee production fields based on apparent soil electrical conductivity Scientia Agricola
Valente,Domingos Sárvio Magalhães; Queiroz,Daniel Marçal de; Pinto,Francisco de Assis de Carvalho; Santos,Nerilson Terra; Santos,Fábio Lúcio.
Fertilizer application at variable rates requires dense sampling to determine the resulting field spatial variability. Defining management zones is a technique that facilitates the variable-rate application of agricultural inputs. The apparent electrical conductivity of the soil is an important factor in explaining the variability of soil physical-chemical properties. Thus, the objective of this study was to define management zones for coffee (Coffea Arabica L.) production fields based on spatial variability of the apparent electrical conductivity of the soil. The resistivity method was used to measure the apparent soil electrical conductivity. Soil samples were collected to measure the chemical and physical soil properties. The maps of spatial variability...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffea Arabica L.; Geostatistics; Fuzzy k-means; Soil sensors.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000300001
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Delineation of irrigation management zones in a Quartzipsamment of the Brazilian semiarid region PAB
Oldoni,Henrique; Bassoi,Luís Henrique.
Abstract The objective of this work was to delineate irrigation management zones using geostatistics and multivariate analysis in different combinations of physical and hydraulic soil properties, as well as to determine the optimal number of management zones in order to avoid overlaping. A field experiment was carried out in a Quartzipsamment, for two years, in an irrigated orchard of table grape, in the Senador Nilo Coelho Irrigation Scheme, in the municipality of Petrolina, in the state of Pernanbuco, Brazil. Soil samples were collected for the determination of soil physico-hydraulic properties. A portable meter was used to measure soil apparent electrical conductivity. Spatial distribution maps were generated using ordinary kriging. Management zones for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fuzzy c-means; Geostatistics; Irrigation planning; Precision agriculture; Soil apparent electrical conductivity; Spatial variability.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901283
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Determination of management zones from normalized and standardized equivalent produtivity maps in the soybean culture REA
Suszek,Grazieli; Souza,Eduardo G. de; Uribe-Opazo,Miguel A.; Nobrega,Lucia H. P..
Through the site-specific management, the precision agriculture brings new techniques for the agricultural sector, as well as a larger detailing of the used methods and increase of the global efficiency of the system. The objective of this work was to analyze two techniques for definition of management zones using soybean yield maps, in a productive area handled with localized fertilization and other with conventional fertilization. The sampling area has 1.74 ha, with 128 plots with site-specific fertilization and 128 plots with conventional fertilization. The productivity data were normalized by two techniques (normalized and standardized equivalent productivity), being later classified in management zones. It can be concluded that the two methods of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Thematic map; Precision agriculture; Geostatistics; Soybean.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000500007
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Determination of spatiotemporal stability of corn head smut(Sporisorium reilianum) by SADIE Ciencia e Investigación Agraria
Ramírez-Dávila,José F; Sánchez-Pale,Jesús R; Porcayo-Camargo,Elvia; de León,Carlos.
Recently, S. reilianum has caused significant ecological and economic damage in the maize-producing areas of Mexico and other countries. Knowledge about the spatiotemporal stability and distribution of the disease is important for the development of integrated management programs. The present study was performed to model the spatial distribution of S. reilianum from 2006 to 2009 using geostatistic techniques and to determine the spatiotemporal stability of corn head smut via a spatial analysis by distance indices (SADIE) and the Cramer-von Mises test. The incidence of the disease was determined in 100 corn parcels located in Santa Magdalena Valle de Bravo Municipality, and the parcel locations were determined with dGPS. The spatial distribution analysis...
Tipo: Journal article Palavras-chave: Geostatistics; SADIE; Spatial distribution; Spatiotemporal stability; Sphacelotheca; Zea mays.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300006
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Dynamics of spatial patterns of microphytobenthic biomass: inferences from a geostatistical analyisis of two comprenhensive surveys in Marennes-Oléron Bay (France) ArchiMer
Guarini, Jean-marc; Blanchard, Gerard; Bacher, Cedric; Gros, Philippe; Riera, Pascal; Richard, Pierre; Gouleau, Dominique; Galois, Robert; Prou, Jean; Sauriau, Pierre-guy.
Microphytobenthos plays an important role as primary producer in shallow embayments subject to a tidal regime. The present paper aims to characterize the spatial patterns of sedimentary chlorophyll a (chl a) biomass in 2 seasons in the wide intertidal mudflats of the Marennes-Oleron Bay (France); furthermore, it provides estimates of total microphytobenthic biomass. Accordingly, a systematic sampling scheme was performed in June 1995 and in January 1996. On average, biomass was higher in June (ca 120 mg chl a m-2) than in January (ca 85 mg chl a m-2). Moreover, the geostatistical analysis revealed that spatial similarities were propagated over larger distances in June (6 km) than in January (2.2 km). In order to account for this result , we suggest that...
Tipo: Text Palavras-chave: Marennes Oleron; Intertidal mudflat; Geostatistics; Spatial distribution; Chrlorophyll a; Microphytobenthos.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/1998/publication-3820.pdf
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