Data/hora: 01/06/2024 02:09:06

Biblioteca(s): | Embrapa Milho e Sorgo.
Tipo da produção científica: | Capítulo em Livro Técnico-Científico
Data corrente: | 23/08/2020
Data da última atualização: | 28/08/2023
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; Juliana Leite Ribeiro, Universidade Federal de São João del-Rei.
Título: | Models for semideciduous seasonal forest production of leaves and deciduousness: recent perspectives.
Ano de publicação: | 2020
Fonte/Imprenta: | In: YU, H. (ed.). International research in environment, geography and earth science. Hooghly: Book Publisher International, 2020.
Volume: | v. 2.
Páginas: | p. 41-72.
DOI: | 978-93-90149-38-4
Idioma: | Inglês
Conteúdo: | The climate, mainly the water availability and temperature, drives the renewal of biomass in seasonal forest ecosystem, and the greenness and leaf area of its canopy are responsive by climate variations. The renewal of leaves indicated by deciduousness can be model to obtain the estimates of this component as an additional compartment of the ecosystem carbon sink. In this study was investigated the relationship between litterfall, climate variables, Leaf Area Index (LAI), and Normalized Difference Vegetation Index (NDVI) in semideciduous forests, to test models to explain the leaf production and deciduousness by time. The data were obtained in satellite images and in plots installed at forest monitoring sites, visited monthly. The tests were conducted in eight semideciduous forest fragments. Permanent plots were monitored monthly and LAI measurements and weighing of litterfall deposited in nets. In this time, Landsat 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 climate variables were verified and regression models was build and evaluated. With monitoring of the sites, the model was validated and reviewed with new variables and data and three equations were compared. It is possible to estimate the fall and renew of leaves biomass in semideciduous forests with reasonable precision. This study showed that only the leaf component of the litterfall of a semideciduous forest in tropical climate can capture average 6.5 Mg.ha-1 .yr-1 of CO2 and this amount can be estimated using climate, biophysics and vegetation index variables.
Palavras-Chave: | NDVI; Thornthwaite.
Thesagro: | Carbono; Ecossistema; Floresta; Folha; Mudança Climática.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
Registro original: | Embrapa Milho e Sorgo (CNPMS)
Exemplares: | CNPMS - (29338-1) - UPC - PL - DD -  -  -  - DIS