Consulta: creatorFacets:"Alvares,Clayton Alcarde"
Registros recuperados: 7
Data/hora: 27/07/2024 08:24:27

APPRAISAL OF THE SNAP MODEL FOR PREDICTING NITROGEN MINERALIZATION IN TROPICAL SOILS UNDER EUCALYPTUS
Provedor de dados: 90
Autores: Smethurst,Philip James; Gonçalves,José Leonardo de Moraes; Pulito,Ana Paula; Gomes,Simone; Paul,Keryn; Alvares,Clayton Alcarde; Arthur Júnior,José Carlos.
The Soil Nitrogen Availability Predictor (SNAP) model predicts daily and annual rates of net N mineralization (NNM) based on daily weather measurements, daily predictions of soil water and soil temperature, and on temperature and moisture modifiers obtained during aerobic incubation (basal rate). The model was based on in situ measurements of NNM in Australian soils under temperate climate. The purpose of this study was to assess this model for use in tropical soils under eucalyptus plantations in São Paulo State, Brazil. Based on field incubations for one month in three, NNM rates were measured at 11 sites (0-20 cm layer) for 21 months. The basal rate was determined in in situ incubations during moist and warm periods (January to March). Annual rates of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest soil; Soil temperature; Process-based model.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200523

Assessing biomass based on canopy height profiles using airborne laser scanning data in eucalypt plantations
Provedor de dados: 63
Autores: Silva,André Gracioso Peres; Görgens,Eric Bastos; Campoe,Otávio Camargo; Alvares,Clayton Alcarde; Stape,José Luiz; Rodriguez,Luiz Carlos Estraviz.
This study aimed to map the stem biomass of an even-aged eucalyptus plantation in southeastern Brazil based on canopy height profile (CHPs) statistics using wall-to-wall discrete return airborne laser scanning (ALS), and compare the results with alternative maps generated by ordinary kriging interpolation from field-derived measurements. The assessment of stem biomass with ALS data was carried out using regression analysis methods. Initially, CHPs were determined to express the distribution of laser point heights in the ALS cloud for each sample plot. The probability density function (pdf) used was the Weibull distribution, with two parameters that in a secondary task, were used as explanatory variables to model stem biomass. ALS metrics such as height...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: LiDAR; Basal area; Biometric model; Forest inventory; Fast-growing plantations.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600504

Historical land-cover/use in different slope and riparian buffer zones in watersheds of the state of São Paulo, Brazil
Provedor de dados: 63
Autores: Silva,Alexandre Marco da; Nalon,Marco Aurélio; Kronka,Francisco José do Nascimento; Alvares,Clayton Alcarde; Camargo,Plinio Barbosa de; Martinelli,Luiz Antonio.
Information about the land cover of a region it is a key information for several purposes. This paper aimed to elaborate land-cover maps using digital satellite images obtained in 1997 from seven watersheds (Piracicaba, Moji-Guaçu, Alto Paranapanema, Turvo Aguapeí, Peixe, and São José dos Dourados) located in the State of São Paulo, southeastern Brazil. Additionaly, this study evaluated the relationship between land-cover and slopes of the terrain of the seven watersheds. A third objective was to estimate the percentage of riparian vegetation currently remaining along the streams in a 30-meter width buffer zone. Three research questions were posed: i) What is the dominant land-cover of these watersheds? ii) Is the riparian vegetation well preserved in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Land planning; Land management; Geoprocessing; Catchments; Rivers.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400003

Soil loss risk and habitat quality in streams of a meso-scale river basin
Provedor de dados: 63
Autores: Silva,Alexandre Marco da; Casatti,Lilian; Alvares,Clayton Alcarde; Leite,Aline Maria; Martinelli,Luiz Antonio; Durrant,Steven F.
Soil loss expectation and possible relationships among soil erosion, riparian vegetation and water quality were studied in the São José dos Dourados River basin, State of São Paulo, Brazil. Through Geographic Information System (GIS) resources and technology, Soil Loss Expectation (SLE) data obtained using the Universal Soil Loss Equation (USLE) model were analyzed. For the whole catchment area and for the 30 m buffer strips of the streams of 22 randomly selected catchments, the predominant land use and habitat quality were studied. Owing mainly to the high soil erodibility, the river basin is highly susceptible to erosive processes. Habitat quality analyses revealed that the superficial water from the catchments is not chemically impacted but suffers...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Erosion modeling; Expectation of soil loss map; Riparian vegetation; Water quality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400004

Spatial variability of physical and chemical attributes of some forest soils in southeastern of Brazil
Provedor de dados: 63
Autores: Alvares,Clayton Alcarde; Gonçalves,José Leonardo de Moraes; Vieira,Sidney Rosa; Silva,Cláudio Roberto da; Franciscatte,Walmir.
Capão Bonito forest soils, São Paulo state, Brazil, have been used for forestry purposes for almost one century. Detailed knowledge about the distribution of soil attributes over the landscape is of fundamental importance for proper management of natural resources. The purpose of this study was to identify the variability and spatial dependence of chemical and physical attributes of Capão Bonito forest soils. A large soil database of regional land was raised and organized. Most of the selected variables were close to the lognormal frequency range. Soil texture presented a higher range in the A horizon, and the nugget effect and sill were greater in the B horizon. These differences are attributed to the parent material of the region (Itararé Geologic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geostatistics; Semivariogram; Geographic information system; Soil management; Forestry precision.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600015

Stability and adaptability for wood volume in the selection of Eucalyptus saligna in three environments
Provedor de dados: 86
Autores: Oliveira,Thiago Wendling Gonçalves de; Paula,Rinaldo Cesar de; Moraes,Mario Luiz Teixeira de; Alvares,Clayton Alcarde; Miranda,Aline Cristina; Silva,Paulo Henrique Muller da.
Abstract: The objective of this work was to evaluate the genotype x environment (GxE) interaction in open-pollinated Eucalyptus saligna progenies for simultaneous selection for greater stability and adaptability for wood volume, as well as to compare the selection strategies through combined and individual analyses in three environments. Three experiments were conducted in a randomized complete block design, with four replicates and six plants per plot, with 102 to 122 progenies. Three years after planting, survival rate and wood volume were evaluated. The genetic parameters were estimated by the maximum restricted likelihood and best linear unbiased prediction (REML/Blup) methods, and the stability and adaptability analysis was conducted using the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest breeding; Genetic selection; Genotype × environment interaction; REML/Blup.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000500611

Sustainability of Wood Productivity of Pinus TaedaBased on Nutrient Export and Stocks in the Biomass and in the Soil
Provedor de dados: 90
Autores: Sixel,Ricardo Michael de Melo; Arthur Junior,José Carlos; Gonçalves,José Leonardo de Moraes; Alvares,Clayton Alcarde; Andrade,Gabriel Ramatis Pugliese; Azevedo,Antonio Carlos; Stahl,James; Moreira,Antônio Maurício.
ABSTRACT The impact of intensive management practices on the sustainability of forest production depends on maintenance of soil fertility. The contribution of forest residues and nutrient cycling in this process is critical. A 16-year-old stand of Pinus taeda in a Cambissolo Húmico Alumínico léptico (Humic Endo-lithic Dystrudept) in the south of Brazil was studied. A total of 10 trees were sampled distributed in five diameter classes according to diameter at breast height. The biomass of the needles, twigs, bark, wood, and roots was measured for each tree. In addition to plant biomass, accumulated plant litter was sampled, and soil samples were taken at three increments based on sampling depth: 0.00-0.20, 0.20-0.40, 0.40-0.60, 0.60-1.00, 1.00-1.40,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil fertility; Nutrient cycling; Forest management.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501416