Data/hora: 15/06/2024 15:28:55

Biblioteca(s): | Embrapa Milho e Sorgo.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | B - 2
Data corrente: | 30/10/2014
Data da última atualização: | 23/05/2017
Autoria: | COSTA, T. C. e C. da; VIANA, J. H. M.; RIBEIRO, J. L.
Afiliação: | THOMAZ CORREA E CASTRO DA COSTA, CNPMS; JOAO HERBERT MOREIRA VIANA, CNPMS.
Título: | Semideciduous seasonal forest production of leaves and deciduousness in function of the water balance, LAI and NDVI.
Ano de publicação: | 2014
Fonte/Imprenta: | International Journal of Ecology, v. 2014, p. 1-15, 2014.
DOI: | http://dx.doi.org/10.1155/2014/923027
Idioma: | Inglês
Conteúdo: | This study investigated the relationship between leaf production, litterfall, water balance, Leaf Area Index (LAI), and Normalized Difference Vegetation Index (NDVI) in semideciduous forests. The goal was to model this phenomenon to obtain the estimates of this component as an additional compartment of the ecosystem carbon sink. The tests were conducted in eight semideciduous forest fragments. Twenty-four permanent plots were monitored monthly and LAI measurements and weighing of litterfall deposited in nets were conducted for a period of thirteen months. In this period, Landsat 5 and IRS satellite images were obtained and processed for generation of NDVI. The water balance was calculated for each day. The relationship among the variables “leaf dry weight,” “LAI,” “NDVI,” and “water balance” was verified and a regression model was built and evaluated. The deciduous phenomenon can be explained by hydric balance, and LAI and NDVI are ancillary variables. The tendency of the variables in the period of 13 months was explained by quadratic functions. The varied behavior among the monitoring sites helped to know differences in the deposition of leaves. This study showed that only the leaf component of the litterfall of a semideciduous forest in tropical climate can capture 4to8Mg?ha?1? yr?1of CO2 and this amount can be estimated using climate, biophysics, and vegetation index variables.
Thesagro: | Balanço hídrico; Floresta.
Categoria do assunto: | --
Registro original: | Embrapa Milho e Sorgo (CNPMS)
Exemplares: | CNPMS - (26213-1) - UPC - AP - DD -  -  -  - DIS