Leaf area index of a tropical semi-deciduous forest of the southern Amazon Basin
- 341 Downloads
Leaf area index (LAI) is an important ecophysiological variable because leaves are the organs responsible for gas exchange between plants and the atmosphere. This variable can be calculated from primary values of leaf area assessed by destructive or non-destructive methods, which is relatively easy when crop species are investigated, but is not the case when the focus is on natural wood plants communities. In this paper, we analyze the seasonality of LAI estimated by three different methods in the Amazonia-savannah transitional forest, located 50 km north-east of Sinop city, Mato Grosso, Brazil. In the first method, we combine Monsi and Saekis' original method [Monsi M, Saeki T (1953) Jpn J Bot 14:22–52], which measures LAI using the Beer-Lambert extinction law, and the proposition of Goudriaan [Goudriaan J (1988) Agric For Meteorol 43:155–169] to estimate the extinction coefficient from solar height. The second method differed from the first only in the way in which the daily fraction of intercepted photosynthetic active radiation (FPAR) was calculated, as proposed by Charles-Edwards and Lawn (Charles-Edwards DA, Lawn RJ (1984) Plant Cell Environ 7:247–251]. In the third method, we used a remote sensing technique [MOD15_BU-collection 4, produced and distributed by EROS Data Center Distributed Active Archive Center (EDC DAAC)]. We found that the first and the second methods revealed the expected LAI dynamics, which increased during the dry–wet transition and wet season, and decreased during the wet–dry transition and dry season. From 20 randomly distributed sets in a 1.0 ha area, only 3 showed significant differences in LAI estimated from the first two methods; conversely, LAI was overestimated by the third method.
KeywordsRadiation interception Photosynthetically active radiation Extinction coefficient
This research was supported in part by Universidade Federal de Mato Grosso (UFMT), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and the Coordenação de Aperfeiçoamento de Pessoal de Nivel Superior (CAPES).
- Charles-Edwards DA, Lawn RJ (1984) Light interception by grain legume row crops. Plant Cell Environ 7:247–251Google Scholar
- Monsi M, Saeki T (1953) Über den Lichtfakor in den Pflanzengesellschaften, seine Bedeutung für die Stoffproduckion. Jpn J Bot 14:22–52Google Scholar
- Myneni RB, Hoffman S, Knyazikhin Y, Privette JL, Glassy J, Tian Y, Wang Y, Song S, Zhang Y, Smith GR, Lotsch A, Frield M, Morrisette JT, Votava P, Nemani RR, Running SW (2002) Global products of vegetation leaf area and fraction absorbed PAR from year one of MODIS data. Remote Sens Environ 83:214–231CrossRefGoogle Scholar
- Priante-Filho N, Vourtilis GL, Hayashi MMS, Nogueira JS, Campelo-Junior JH, Nunes PC, Sanches L, Couto EG, Hoeger W, Raiter F, Trienweiler JL, Miranda EJ, Priante PC, Fritzen CL, Lacerda M, Pereira LC, Biudes MS, Suli GS, Shiraiwa S, Paulo SR, Silveira M (2004) Comparison of the mass and energy exchange of a pasture and a mature transitional tropical forest of the southern Amazon Basin during a seasonal transition. Glob Chang Biol 10:863–876CrossRefGoogle Scholar
- Sanches L, Valentini CMA, Pinto-Júnior OB, Nogueira JS, Vourlitis GL, Biudes MS, Silva CJ, Bambi P, Lobo FA (2008) Seasonal and interannual litter dynamics of a tropical semideciduous forest of the southern Amazon Basin, Brazil. J Geophys Res 113(2008):G04007. doi: 10.1029/2007JG000593 CrossRefGoogle Scholar
- Vourtilis GL, Priante-Filho N, Hayashi MMS, Nogueira JS, Caseiro F, Campelo-Júnior JH (2002) Seasonal variations in the evapotranspiration of a transitional tropical Forest of Mato Grosso, Brazil. Water Resour Res 38. doi: 10.1029/2000WR000122
- Vourlitis GL, Nogueira JS, Lobo FA, Sendall KM, Faria JLB, Dias CAA, Andrade NLR (2008) Energy balance and canopy conductance of a tropical semi-deciduous forest of the southern Amazon Basin. Water Resour Res 44:W03412. doi: 10.1029/2006WR005526