Data/hora: 10/06/2024 03:31:12

Biblioteca(s): | Embrapa Semiárido.
Data corrente: | 17/12/2013
Data da última atualização: | 20/12/2013
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.
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: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/94197/1/Magna-3.pdf
Registro original: | Embrapa Semiárido (CPATSA)
Exemplares: | CPATSA - (51354-1) - UPC - AP - DD -  -  -  - DIS