Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio

Detalhes bibliográficos
Autor(a) principal: Graciosa, Mariana Guimar?es
Data de Publicação: 2012
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRRJ
Texto Completo: https://tede.ufrrj.br/jspui/handle/jspui/4261
Resumo: Evaluation from interrelationships between ground cover, leaf area index (LAI) and biomass production is an important subsidy for the sustainable management of grassland ecosystems. To this end, research is needed that compares the various existing methodologies and yet advance on the possibilities offered by new digital techniques typical from spectral sensing and artificial vision. It has been observed that there are virtually no studies comparing methods for estimating LAI in forage plants, especially those from tropical climates. The genus Cynodon grasses has been received considerable attention on the quantity and quality of forage produced. Nitrogen (N) is a macronutrient of central importance in the expression of photosynthetic potential from the grasses, since it provides increases in the efficiency of interception and use of solar radiation. Therefore, research was conducted to verify the hypothesis that adding nitrogen to soil results in changes in vegetation cover and LAI in the swards of Tifton 85, which can be monitored, with variable efficiency, with a set of direct or indirect techniques. The study was conducted at the Experimental Station of Parasitology "Otto Wilhelm Neitz" in the Institute of Veterinary from UFRRJ in plots previously installed, with an area of 4 m2. Four N rates (0, 50, 100 and 200 kg N / ha) were combined with sampling dates in a single cycle of regrowth from the grass, in February 2012. Information were collected regarding the canopy height, photosynthetically active radiation interception, biomass and green LAI, as well as visual evaluation from green cover. Jointly, images were obtained in the visible band and near infrared. Were calculated the following vegetation index (VI): RVI, NDVI, and GNDVI GSAVI. A direct destructive method for estimating LAI was compared with a indirect one, obtained with a ceptometer (AccuPAR L80). Results allowed to conclude that: a) Estimates of vegetation cover, collected by analysis of images taken directly above the sward proved to be equivalent to those obtained by counting the intersections of the lawn with a grid. The technique of assisted visual assessment provided estimates overestimated compared with the other two techniques compared; b) The indirect measurement of LAI made with a ceptometer resulted in underestimated values in relation to the technique of direct evaluation and destructive; c) All VIs studied from the analysis of images obtained with multispectral camera, showed sensitivity to nitrogen and constituted equally efficient estimators of green biomass produced by the grass, evidencing the importance of information from the infrared reflectance of the canopy; d) The same IVs showed only partial efficiency in relation to the indirect estimation of LAI, although it should be remembered that the relationship between IV and the attributes of the canopy were measured in a single event of observation and, therefore, require further analysis for its confirmation.
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spelling Rossiello, Roberto Oscar Pereyrahttp://lattes.cnpq.br/0160231679600890Varella, Carlos Alberto AlvesSena J?nior, Darly Geraldo de055.691.366-30http://lattes.cnpq.br/3703755474710894Graciosa, Mariana Guimar?es2020-12-14T02:35:44Z2012-05-16GRACIOSA, Mariana Guimar?es. Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio. 2012. 63 f. Disserta??o (Programa de P?s-Gradua??o em Zootecnia) - Universidade Federal Rural do Rio de Janeiro, Serop?dica.https://tede.ufrrj.br/jspui/handle/jspui/4261Evaluation from interrelationships between ground cover, leaf area index (LAI) and biomass production is an important subsidy for the sustainable management of grassland ecosystems. To this end, research is needed that compares the various existing methodologies and yet advance on the possibilities offered by new digital techniques typical from spectral sensing and artificial vision. It has been observed that there are virtually no studies comparing methods for estimating LAI in forage plants, especially those from tropical climates. The genus Cynodon grasses has been received considerable attention on the quantity and quality of forage produced. Nitrogen (N) is a macronutrient of central importance in the expression of photosynthetic potential from the grasses, since it provides increases in the efficiency of interception and use of solar radiation. Therefore, research was conducted to verify the hypothesis that adding nitrogen to soil results in changes in vegetation cover and LAI in the swards of Tifton 85, which can be monitored, with variable efficiency, with a set of direct or indirect techniques. The study was conducted at the Experimental Station of Parasitology "Otto Wilhelm Neitz" in the Institute of Veterinary from UFRRJ in plots previously installed, with an area of 4 m2. Four N rates (0, 50, 100 and 200 kg N / ha) were combined with sampling dates in a single cycle of regrowth from the grass, in February 2012. Information were collected regarding the canopy height, photosynthetically active radiation interception, biomass and green LAI, as well as visual evaluation from green cover. Jointly, images were obtained in the visible band and near infrared. Were calculated the following vegetation index (VI): RVI, NDVI, and GNDVI GSAVI. A direct destructive method for estimating LAI was compared with a indirect one, obtained with a ceptometer (AccuPAR L80). Results allowed to conclude that: a) Estimates of vegetation cover, collected by analysis of images taken directly above the sward proved to be equivalent to those obtained by counting the intersections of the lawn with a grid. The technique of assisted visual assessment provided estimates overestimated compared with the other two techniques compared; b) The indirect measurement of LAI made with a ceptometer resulted in underestimated values in relation to the technique of direct evaluation and destructive; c) All VIs studied from the analysis of images obtained with multispectral camera, showed sensitivity to nitrogen and constituted equally efficient estimators of green biomass produced by the grass, evidencing the importance of information from the infrared reflectance of the canopy; d) The same IVs showed only partial efficiency in relation to the indirect estimation of LAI, although it should be remembered that the relationship between IV and the attributes of the canopy were measured in a single event of observation and, therefore, require further analysis for its confirmation.A avalia??o das inter-rela??es entre cobertura do solo, ?ndice de ?rea foliar (IAF) e produ??o de biomassa constitui um subs?dio importante para o manejo sustent?vel dos ecossistemas de pastagens. Para tal, s?o necess?rias pesquisas que comparem as diversas metodologias existentes e ainda avancem sobre as possibilidades abertas pelas novas t?cnicas digitais pr?prias do sensoriamento espectral e da vis?o artificial. Tem sido observado que praticamente n?o existem trabalhos comparando m?todos de estimativa do IAF em plantas forrageiras, particularmente aquelas de clima tropical. As gram?neas forrageiras do g?nero Cynodon v?m recebendo consider?vel aten??o em fun??o da quantidade e qualidade da forragem produzida. O nitrog?nio (N) ? um macronutriente de import?ncia central na express?o do potencial fotossint?tico das gram?neas forrageiras, por propiciar aumentos na efici?ncia da intercepta??o e de uso da radia??o solar. Portanto, foi realizada pesquisa para verificar a hip?tese de que a adi??o de N ao solo implica em modifica??es da cobertura vegetal e do IAF em relvados do capim- Tifton 85, as quais poder?o ser monitoradas, com efici?ncia vari?vel, por um conjunto de t?cnicas diretas ou indiretas. O estudo foi conduzido na Esta??o Experimental de Parasitologia ?Wilhelm Otto Neitz? do Instituto de Veterin?ria da UFRRJ, em parcelas experimentais previamente instaladas, com ?rea ?til de 4 m2. Quatro doses de N (0, 50, 100 e 200 kg N/ha) foram combinadas com datas de amostragens num ?nico ciclo de rebrota do capim, no m?s de fevereiro de 2012. Foram coletadas informa??es relativas ? altura do dossel, intercepta??o da radia??o fotossinteticamente ativa, biomassa e IAF verde, assim como avalia??es visuais para cobertura vegetal. Conjuntamente foram obtidas imagens fotogr?ficas dentro da banda vis?vel e do infravermelho pr?ximo. Foram calculados os seguintes ?ndices de Vegeta??o (IV): RVI; NDVI; GNDVI e GSAVI. Um m?todo direto e destrutivo de determina??o do IAF foi comparado com outro indireto, obtido com cept?metro (AccuPAR L80). Os resultados obtidos permitiram concluir que: a) As estimativas da cobertura vegetal, feitas por an?lise de imagens fotogr?ficas tomadas diretamente acima do relvado mostraram-se equivalentes ?s obtidas atrav?s de contagem das interse??es do relvado com uma grade reticulada. A t?cnica de avalia??o visual assistida forneceu estimativas superestimadas em rela??o com ?s outras duas t?cnicas comparadas; b) A avalia??o indireta do IAF feita com um cept?metro conduziu a valores subestimados em rela??o ? t?cnica de avalia??o direta e destrutiva; c) Todos os IVs estudados a partir da an?lise de imagens obtidas com c?mara multiespectral, mostraram sensibilidade ? aduba??o nitrogenada e se constitu?ram em estimadores igualmente eficientes da biomassa verde seca produzida pelo capim, evidenciando a import?ncia da informa??o proveniente da reflect?ncia infravermelha do dossel; d) Os mesmos IVs evidenciaram uma efici?ncia apenas parcial em rela??o ? estimativa indireta do IAF, embora deva ser lembrado que as rela??es entre IV e os atributos do dossel mensurados foram produto de um ?nico evento de observa??o e , portanto, carecem de novas an?lises para sua confirma??o.Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2020-12-14T02:35:44Z No. of bitstreams: 1 2012 - Mariana Guimar?es Graciosa.pdf: 1639507 bytes, checksum: 79a75c0096afd0302622a388a563f7c6 (MD5)Made available in DSpace on 2020-12-14T02:35:44Z (GMT). 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dc.title.por.fl_str_mv Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio
dc.title.alternative.eng.fl_str_mv Methodologies for evaluating green cover and leaf area index of Tifton 85 (Cynodon spp) under nitrogen doses
title Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio
spellingShingle Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio
Graciosa, Mariana Guimar?es
atributos estruturais
cept?metro
?ndice de Cobertura Verde
ceptometer
direct method
Green Coverage Index
Zootecnia
title_short Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio
title_full Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio
title_fullStr Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio
title_full_unstemmed Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio
title_sort Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio
author Graciosa, Mariana Guimar?es
author_facet Graciosa, Mariana Guimar?es
author_role author
dc.contributor.advisor1.fl_str_mv Rossiello, Roberto Oscar Pereyra
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/0160231679600890
dc.contributor.referee1.fl_str_mv Varella, Carlos Alberto Alves
dc.contributor.referee2.fl_str_mv Sena J?nior, Darly Geraldo de
dc.contributor.authorID.fl_str_mv 055.691.366-30
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/3703755474710894
dc.contributor.author.fl_str_mv Graciosa, Mariana Guimar?es
contributor_str_mv Rossiello, Roberto Oscar Pereyra
Varella, Carlos Alberto Alves
Sena J?nior, Darly Geraldo de
dc.subject.por.fl_str_mv atributos estruturais
cept?metro
?ndice de Cobertura Verde
topic atributos estruturais
cept?metro
?ndice de Cobertura Verde
ceptometer
direct method
Green Coverage Index
Zootecnia
dc.subject.eng.fl_str_mv ceptometer
direct method
Green Coverage Index
dc.subject.cnpq.fl_str_mv Zootecnia
description Evaluation from interrelationships between ground cover, leaf area index (LAI) and biomass production is an important subsidy for the sustainable management of grassland ecosystems. To this end, research is needed that compares the various existing methodologies and yet advance on the possibilities offered by new digital techniques typical from spectral sensing and artificial vision. It has been observed that there are virtually no studies comparing methods for estimating LAI in forage plants, especially those from tropical climates. The genus Cynodon grasses has been received considerable attention on the quantity and quality of forage produced. Nitrogen (N) is a macronutrient of central importance in the expression of photosynthetic potential from the grasses, since it provides increases in the efficiency of interception and use of solar radiation. Therefore, research was conducted to verify the hypothesis that adding nitrogen to soil results in changes in vegetation cover and LAI in the swards of Tifton 85, which can be monitored, with variable efficiency, with a set of direct or indirect techniques. The study was conducted at the Experimental Station of Parasitology "Otto Wilhelm Neitz" in the Institute of Veterinary from UFRRJ in plots previously installed, with an area of 4 m2. Four N rates (0, 50, 100 and 200 kg N / ha) were combined with sampling dates in a single cycle of regrowth from the grass, in February 2012. Information were collected regarding the canopy height, photosynthetically active radiation interception, biomass and green LAI, as well as visual evaluation from green cover. Jointly, images were obtained in the visible band and near infrared. Were calculated the following vegetation index (VI): RVI, NDVI, and GNDVI GSAVI. A direct destructive method for estimating LAI was compared with a indirect one, obtained with a ceptometer (AccuPAR L80). Results allowed to conclude that: a) Estimates of vegetation cover, collected by analysis of images taken directly above the sward proved to be equivalent to those obtained by counting the intersections of the lawn with a grid. The technique of assisted visual assessment provided estimates overestimated compared with the other two techniques compared; b) The indirect measurement of LAI made with a ceptometer resulted in underestimated values in relation to the technique of direct evaluation and destructive; c) All VIs studied from the analysis of images obtained with multispectral camera, showed sensitivity to nitrogen and constituted equally efficient estimators of green biomass produced by the grass, evidencing the importance of information from the infrared reflectance of the canopy; d) The same IVs showed only partial efficiency in relation to the indirect estimation of LAI, although it should be remembered that the relationship between IV and the attributes of the canopy were measured in a single event of observation and, therefore, require further analysis for its confirmation.
publishDate 2012
dc.date.issued.fl_str_mv 2012-05-16
dc.date.accessioned.fl_str_mv 2020-12-14T02:35:44Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.citation.fl_str_mv GRACIOSA, Mariana Guimar?es. Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio. 2012. 63 f. Disserta??o (Programa de P?s-Gradua??o em Zootecnia) - Universidade Federal Rural do Rio de Janeiro, Serop?dica.
dc.identifier.uri.fl_str_mv https://tede.ufrrj.br/jspui/handle/jspui/4261
identifier_str_mv GRACIOSA, Mariana Guimar?es. Metodologias de avalia??o de cobertura vegetal e ?ndice de ?rea foliar em capim Tifton 85 (Cynodon spp) sob doses de nitrog?nio. 2012. 63 f. Disserta??o (Programa de P?s-Gradua??o em Zootecnia) - Universidade Federal Rural do Rio de Janeiro, Serop?dica.
url https://tede.ufrrj.br/jspui/handle/jspui/4261
dc.language.iso.fl_str_mv por
language por
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http://localhost:8080/tede/bitstream/jspui/4261/2/2012+-+Mariana+Guimar%C3%A3es+Graciosa.pdf
http://localhost:8080/tede/bitstream/jspui/4261/1/license.txt
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repository.name.fl_str_mv Biblioteca Digital de Teses e Dissertações da UFRRJ - Universidade Federal Rural do Rio de Janeiro (UFRRJ)
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