Data/hora: 23/09/2024 09:35:02

Biblioteca(s): 	Embrapa Semiárido.	
Data corrente: 	24/01/2013	
Data da última atualização: 	24/05/2017	
Autoria: 	TEIXEIRA, A. H. de C.; WARREN, M. S.; HERNANDEZ, F. B. T.; LOPES, H. L.	
Afiliação: 	ANTONIO HERIBERTO DE C TEIXEIRA, CPATSA; MORRIS SHERER WARREN; FERNANDO B. T. HERNANDEZ; HÉLIO L. LOPES.	
Título: 	Water productivity assessment by using MODIS images and agrometeorological data in the Petrolina municipality, Brazil.	
Ano de publicação: 	2012	
Fonte/Imprenta: 	Proceedings of SPIE - Remote Sensing for Agriculture, Ecosystems and Hrydrology, v. 8531, sept. 2012.	
DOI: 	10.1117/12.974376	
Idioma: 	Inglês	
Conteúdo: 	The municipality of Petrolina, located in the semi-arid region of Brazil, is highlighted as an important agricultural growing region, however the irrigated areas have cleared natural vegetation inducing a loss of biodiversity. To analyze the contrast between these two ecosystems the large scale values of biomass production (BIO), evapotranspiration (ET) and water productivity (WP) were quantified. Monteith´s equation was applied for estimating the absorbed photosynthetically active radiation (APAR), while the new SAFER (Simple Algorithm For Evapotranspiration Retrieving) algorithm was used to retrieve ET. The water productivity (WP) was analysed by the ratio of BIO by ET at monthly time scale with four bands of MODIS satellite images together with agrometeorological data for the year of 2011. The period with the highest water productivity values were from March to April in the rainy period for both irrigated and not irrigated conditions. However the largest ET rates were in November for irrigated crops and April for natural vegetation. More uniformity of the vegetation and water variables occurs in natural vegetation, evidenced by the lower values of standard deviation when comparing to irrigated crops, due to the different crop stages, cultural and irrigation managements. The models applied with MODIS satellite images on a large scale are considered to be suitable for water productivity assessments and for quantifying the effects of increasing irrigated areas over natural vegetation on regional water consumption in situations of quick changing land use pattern.	
Palavras-Chave: 	Albedo; Biomassa de superfície; NDVI; Ttemperatura da superfície.	
Thesagro: 	Evapotranspiração.	
Thesaurus Nal: 	Evapotranspiration.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Semiárido (CPATSA)	
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