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Insights from a large-scale inventory in the southern Brazilian Atlantic Forest Scientia Agricola
Vibrans,Alexander Christian; Gasper,André Luís de; Moser,Paolo; Oliveira,Laio Zimermann; Lingner,Débora Vanessa; Sevegnani,Lucia.
ABSTRACT: A key issue in large-area inventories is defining a suitable sampling design and the effort required to obtain reliable estimates of species richness and forest attributes, especially in species-diverse forests. To address this issue, data from 418 systematically distributed 0.4 ha plots were collected. Estimators of nonparametric species richness were employed to assess the floristic representativeness of data collected in three forest types in the Brazilian Atlantic Forest. The sampling sufficiency of forest attributes was evaluated as a function of sample size. Altogether, 831 tree/shrub species were recorded. The data acquired through the systematic sampling design were representative of both species richness and basal area. The confidence...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Forest attributes estimation; Species richness; Forest monitoring; Systematic sampling; Secondary forests.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101000
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Using remote sensing images for stratification of the cerrado in forest inventories PFB - Pesquisa Florestal Brasileira
Silva, Sérgio Teixeira da; Mello, José Marcio de; Acerbi Junior, Fausto Weimar; Reis, Aliny Aparecida dos; Raimundo, Marcel Regis; Silva, Iasmim Louriene Gouveia; Scolforo, José Roberto Soares.
Remote sensing imagery can be a very useful auxiliary tool for native forests inventory. Thus, the objective of this study was to evaluate the stratification of a cerrado (Brazilian savanna) patch based on visual image interpretation techniques as well as to compare the errors from two sampling designs, the Stratified Random Sampling (SRS) and the Systematic Sampling (SS).The study area corresponds to a cerrado sensu stricto patch located in the municipality of Papagaios, Minas Gerais, Brazil. The cerrado wood volumes were obtained from a forest inventory field campaign where 32 plots were measured systematically. The study area was stratified based on a visual interpretation of a Landsat 5 TM image, and the strata formed were: “Strata I”, “Strata II”,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Systematic sampling; Tratified Random Sampling; Visual image interpretation; Remote Sensing Engenharia Florestal; Manejo e Inventário Florestal; Sensoriamento Remoto Amostragem Sistemática; Amostragem Casual Estratificada; Interpretação visual de imagens; Sensoriamento remoto.
Ano: 2014 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/742
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Variability of apparently homogeneous soilscapes in São Paulo state, Brazil: I. spatial analysis Rev. Bras. Ciênc. Solo
Berg,M. van Den; Oliveira,J. B..
The spatial variability of strongly weathered soils under sugarcane and soybean/wheat rotation was quantitatively assessed on 33 fields in two regions in São Paulo State, Brazil: Araras (15 fields with sugarcane) and Assis (11 fields with sugarcane and seven fields with soybean/wheat rotation). Statistical methods used were: nested analysis of variance (for 11 fields), semivariance analysis and analysis of variance within and between fields. Spatial levels from 50 m to several km were analyzed. Results are discussed with reference to a previously published study carried out in the surroundings of Passo Fundo (RS). Similar variability patterns were found for clay content, organic C content and cation exchange capacity. The fields studied are quite...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil variability; Systematic sampling; Latosols; Semivariance analysis.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832000000200015
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