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Details van artikel 20 van 112 gevonden artikelen
| Titel: |
Correlações entre variáveis climáticas e séries multitemporais EVI em floresta natural e em cultivo agrícola |
| Auteur: |
Carlos Alexandre Damasceno Ribeiro Christovão Pereira Abrahão Alexandre Cândido Xavier |
| Verschenen in: |
Cerne |
| Paginering: | Jaargang 15 (2009) nr. 2 pagina's 196-204 |
| Jaar: |
2009 |
| Inhoud: |
Through the utilization of multitemporal series of EVI (Enhanced Vegetation Index) data and climatic variables, 990models have been adjusted, divided between natural forest environments and cropping areas. The study area locates in the city ofSooretama, to the north of the State of Espirito Santo, between the parallels 18º 53 53"S and 19º 30' 00"S and the meridians 39º 5000"W and 40º 15 50"W. It s been assumed that the EVI data vary exclusively in function of the pluviosity (PP), temperature (T),relative humidity (UR) and photoperiod (FP). So, these four variables were grouped in all possible ways, totalizing fifteen combinations.In the investigation of the correlations between EVI and climatic variables, were also considered the lag that the vegetation needs tooverwhelm the stress (e.g. hydrical stress). The models have been adjusted through the ordinary least-squares method and evaluatedby the determination coefficients (R2) values. It was concluded that while in the natural forest the EVI has a higher correlation withclimatic variables applying more days of lag, in cropping areas the inverse was observed. Models contents two variables showed tohave a predictive capacity close to the ones with four variables. The models with bigger predictive capacity for the natural forest hadincluded the FP, whereas for the cropping area they had been the ones that had included the T. The 3 independent variables in thecropping areas more correlated with the EVI were T, UR and PP. |
| Uitgever: |
Universidade Federal de Lavras - UFLA (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 20 van 112 gevonden artikelen
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