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Biblioteca(s): |
Embrapa Semiárido. |
Data corrente: |
17/12/2013 |
Data da última atualização: |
20/12/2013 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
GALVÍNCIO, J. D.; MOURA, M. S. B. de; SILVA, T. G. F. da; SILVA, B. B. da; NAUE, C. R. |
Afiliação: |
JOSICLÊDA DOMICIANO GALVÍNCIO; MAGNA SOELMA BESERRA DE MOURA, CPATSA; THIERES GEORGE FREIRE DA SILVA; BERNARDO BARBOSA DA SILVA; CARINE ROSA NAUE. |
Título: |
LAI Improved to dry forest in Semiarid of the Brazil. |
Ano de publicação: |
2013 |
Fonte/Imprenta: |
International Journal of Remote Sensing Applications, v. 3, n. 4, p. 193-202, dec. 2013. |
DOI: |
10.14355/ijrsa.2013.0304.04 |
Idioma: |
Inglês |
Conteúdo: |
Savannas are globally important ecosystems of great significance to human economies. Savannas exist in water-limited regions which forces tree canopies open and heterogeneous. The open canopy structure allows grass to co-dominate in the savannas by occupying different niches in space and time. Leaf area index (LAI) and fraction of photosynthetically active radiation absorbed by vegetation (FPAR) characterize vegetation canopy functioning and energy absorption capacity. LAI and FPAR are key parameters in most ecosystem productivity models and global models of climate, hydrology, biogeochemistry and ecology. Given the above, this study aimed to develop an equation of LAI calibrated by savannah in semiarid northeastern Brazil and proposed a model to better estimate the LAI for dry forest, such as the savanna (Caatinga). The model developed in this study may be used to improve the estimates of Leaf Area Index [LAI] in dry forest with NDVI. One model for savanna-specific of leaf area index (LAI) has been developed. The use of S Curve statistical methods to calibrate the leaf area index (LAI) proved to be an efficient method. The model development gives good results in most of the LAI range known for Caatinga stands in Northeast of Brazil. The Root Mean Square Error (RMSE) calculated on an independent LAI dataset was 0.10, which is about 6% of the average measured LAI. This method offers a simple and operational alternative to application of complex and computationally intensive techniques, and could be used to design other species-specific LAIs. This study reinforces the importance of developing models to better estimate the LAI in different ecosystems since there are no similarities of the LAI between dry and humid climate. MenosSavannas are globally important ecosystems of great significance to human economies. Savannas exist in water-limited regions which forces tree canopies open and heterogeneous. The open canopy structure allows grass to co-dominate in the savannas by occupying different niches in space and time. Leaf area index (LAI) and fraction of photosynthetically active radiation absorbed by vegetation (FPAR) characterize vegetation canopy functioning and energy absorption capacity. LAI and FPAR are key parameters in most ecosystem productivity models and global models of climate, hydrology, biogeochemistry and ecology. Given the above, this study aimed to develop an equation of LAI calibrated by savannah in semiarid northeastern Brazil and proposed a model to better estimate the LAI for dry forest, such as the savanna (Caatinga). The model developed in this study may be used to improve the estimates of Leaf Area Index [LAI] in dry forest with NDVI. One model for savanna-specific of leaf area index (LAI) has been developed. The use of S Curve statistical methods to calibrate the leaf area index (LAI) proved to be an efficient method. The model development gives good results in most of the LAI range known for Caatinga stands in Northeast of Brazil. The Root Mean Square Error (RMSE) calculated on an independent LAI dataset was 0.10, which is about 6% of the average measured LAI. This method offers a simple and operational alternative to application of complex and computationally intensive t... Mostrar Tudo |
Palavras-Chave: |
Ecossistemas secos; Fieldspec; LAI; Modelo de desenvolvimento; Natural resource; Savanas. |
Thesagro: |
Caatinga; Recurso natural; Sensoriamento remoto. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/94197/1/Magna-3.pdf
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Marc: |
LEADER 02594naa a2200289 a 4500 001 1974172 005 2013-12-20 008 2013 bl uuuu u00u1 u #d 024 7 $a10.14355/ijrsa.2013.0304.04$2DOI 100 1 $aGALVÍNCIO, J. D. 245 $aLAI Improved to dry forest in Semiarid of the Brazil.$h[electronic resource] 260 $c2013 520 $aSavannas are globally important ecosystems of great significance to human economies. Savannas exist in water-limited regions which forces tree canopies open and heterogeneous. The open canopy structure allows grass to co-dominate in the savannas by occupying different niches in space and time. Leaf area index (LAI) and fraction of photosynthetically active radiation absorbed by vegetation (FPAR) characterize vegetation canopy functioning and energy absorption capacity. LAI and FPAR are key parameters in most ecosystem productivity models and global models of climate, hydrology, biogeochemistry and ecology. Given the above, this study aimed to develop an equation of LAI calibrated by savannah in semiarid northeastern Brazil and proposed a model to better estimate the LAI for dry forest, such as the savanna (Caatinga). The model developed in this study may be used to improve the estimates of Leaf Area Index [LAI] in dry forest with NDVI. One model for savanna-specific of leaf area index (LAI) has been developed. The use of S Curve statistical methods to calibrate the leaf area index (LAI) proved to be an efficient method. The model development gives good results in most of the LAI range known for Caatinga stands in Northeast of Brazil. The Root Mean Square Error (RMSE) calculated on an independent LAI dataset was 0.10, which is about 6% of the average measured LAI. This method offers a simple and operational alternative to application of complex and computationally intensive techniques, and could be used to design other species-specific LAIs. This study reinforces the importance of developing models to better estimate the LAI in different ecosystems since there are no similarities of the LAI between dry and humid climate. 650 $aCaatinga 650 $aRecurso natural 650 $aSensoriamento remoto 653 $aEcossistemas secos 653 $aFieldspec 653 $aLAI 653 $aModelo de desenvolvimento 653 $aNatural resource 653 $aSavanas 700 1 $aMOURA, M. S. B. de 700 1 $aSILVA, T. G. F. da 700 1 $aSILVA, B. B. da 700 1 $aNAUE, C. R. 773 $tInternational Journal of Remote Sensing Applications$gv. 3, n. 4, p. 193-202, dec. 2013.
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Embrapa Semiárido (CPATSA) |
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Registro Completo
Biblioteca(s): |
Embrapa Hortaliças. |
Data corrente: |
12/12/2008 |
Data da última atualização: |
22/03/2010 |
Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
Autoria: |
VIEIRA, J. V.; SILVA, G. O. da. |
Afiliação: |
Jairo Vidal Vieira, Embrapa Hortaliças; Giovani Olegario da Silva, Embrapa Hortaliças. |
Título: |
Ganhos reais com a seleção para caracteres de importância agronômica em cenoura. |
Ano de publicação: |
2008 |
Fonte/Imprenta: |
Horticultura Brasileira, Brasília, DF, v. 26, n. 2, p. S4531-S4537, 2008. |
Idioma: |
Português |
Notas: |
Suplemento. CD-ROM. Trabalho apresentado no 48. Congresso Brasileiro de Olericultura, Maringá, 2008. |
Palavras-Chave: |
Ganho genético. |
Thesagro: |
Cenoura; Daucus Carota; Melhoramento; Seleção. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00656naa a2200193 a 4500 001 1780973 005 2010-03-22 008 2008 bl uuuu u00u1 u #d 100 1 $aVIEIRA, J. V. 245 $aGanhos reais com a seleção para caracteres de importância agronômica em cenoura. 260 $c2008 500 $aSuplemento. CD-ROM. Trabalho apresentado no 48. Congresso Brasileiro de Olericultura, Maringá, 2008. 650 $aCenoura 650 $aDaucus Carota 650 $aMelhoramento 650 $aSeleção 653 $aGanho genético 700 1 $aSILVA, G. O. da 773 $tHorticultura Brasileira, Brasília, DF$gv. 26, n. 2, p. S4531-S4537, 2008.
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