Seasonal landscape and spectral vegetation index dynamics in the Brazilian Cerrado: An analysis within the Large-Scale Biosphere–Atmosphere Experiment in Amazônia (LBA)

Ferreira, Laerte Guimarães; Yoshioka, Hiroki; Huete, Alfredo; Sano, Edson Eyji

doi:10.1016/j.rse.2002.09.003

Cited by 107 publications

(74 citation statements)

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“…While the use of narrow-band spectral indices could relate to specific vegetations properties, their development through time could depict changes in vegetation conditions along the phenological cycle. This had also been demonstrated in a study in the Cerrado, which made use of spectral indices derived from MODIS to describe annual vegetation dynamics [90]. Indeed, we observed that while the narrow-band NDVI was determinant in explaining the variance in most models, the leaf water content index (LWVI2) was also highly contributing in models fit on the EnMAP simulated data and in most multi-index models fit on (single-date) Hyperion data.…”

Section: Discussionsupporting

confidence: 75%

“…10m). At the end of the dry season (August image), the contrast between the dark woody (perennial) vegetation and the light background (soil and yearly herbaceous vegetation) is at its highest [90], which makes the surface's albedo a good proxy for (woody) vegetation cover. We have thus resampled the ALI panchromatic data to the Hyperion g.s.d.…”

Section: Figure 4 Study Area In the Brazilian Cerrado: Estação Ecolómentioning

confidence: 99%

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Monitoring Natural Ecosystem and Ecological Gradients: Perspectives with EnMAP

et al. 2015

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Abstract:In times of global environmental change, the sustainability of human-environment systems is only possible through a better understanding of ecosystem processes. An assessment of anthropogenic environmental impacts depends upon monitoring natural ecosystems. These systems are intrinsically complex and dynamic, and are characterized by ecological gradients. Remote sensing data repeatedly collected in a systematic manner are suitable for describing such gradual changes over time and landscape gradients, e.g., through information on the vegetation's phenology. Specifically, imaging spectroscopy is capable of describing ecosystem processes, such as primary productivity or leaf water content of vegetation. Future spaceborne imaging spectroscopy missions like the Environmental Mapping and Analysis Program (EnMAP) will repeatedly acquire highquality data of the Earth's surface, and will thus be extremely useful for describing natural ecosystems and the services they provide. In this conceptual paper, we present some of the preparatory research of the EnMAP Scientific Advisory Group (EnSAG) on natural ecosystems and ecosystem transitions. Through two case studies we illustrate the usage of OPEN ACCESSRemote Sens. 2015, 7 13099 spectral indices derived from multi-date imaging spectroscopy data at EnMAP scale, for mapping vegetation gradients. We thus demonstrate the benefit of future EnMAP data for monitoring ecological gradients and natural ecosystems.

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Section: Discussionsupporting

confidence: 75%

Section: Figure 4 Study Area In the Brazilian Cerrado: Estação Ecolómentioning

confidence: 99%

Monitoring Natural Ecosystem and Ecological Gradients: Perspectives with EnMAP

et al. 2015

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“…foi incluída por ser Tabela 1. Dados estruturais da vegetação nos sítios de cerrado fechado (CF) e cerrado aberto (CA) do Parque Nacional de Brasília, Brasília-DF segundo Ferreira et al (2003). Table 1.…”

Section: Methodsunclassified

“…Table 1. Structural characteristics of vegetation in the "closed" cerrado (cerrado fechado -CF) and "open" cerrado (cerrado aberto -CA) sites at the Parque Nacional de Brasília, Brasília-DF according to Ferreira et al (2003). A extração de clorofila a e de clorofila b foi feita a partir de discos foliares de 5,5 mm de diâmetro, incubados em 1 mL de dimetilsulfóxido (DMSO) em banho-maria (65 ºC), com quantificação por espectrofotometria UV-VIS (Richardson et al 2002).…”

Section: Methodsunclassified

Variações sazonais nas concentrações de pigmentos e nutrientes em folhas de espécies de cerrado com diferentes estratégias fenológicas

Carvalho¹,

Bustamante²,

Kozovits³

et al. 2007

Rev. bras. Bot.

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-(Seasonal variations in leaf pigments and nutrients in "cerrado" species with different phenological patterns). Several studies have been trying to establish relationships between environmental conditions and leaf traits. In the present study, concentrations of pigments (chlorophylls a, b, carotenoids and anthocyanins), N and P and specific leaf area (SLA) were measured in leaves of six "cerrado" species (three deciduous and three evergreen species) in two cerrado stricto sensu sites with differences in canopy cover and in different periods: at the beginning of the dry season (June), end of dry season (September) and beginning of the rainy season (November). Nutrient concentrations differed significantly as a function of phenology and seasonality while pigments were more sensitive to changes in vegetation structure. The highest chlorophyll a and b concentrations were measured at the beginning of the dry season (June) in comparison to the end of the dry season (September) in both sites. In June, chlorophyll a and b concentrations were higher in the denser cerrado while the chlorophyll a/b ratio was lower. Total chlorophyll/carotenoids ratio was also significantly higher in the denser cerrado at the beginning of the dry season due to the higher chlorophyll concentration. Deciduous species showed higher SLA mean values than evergreen species, in dry and wet season but higher N and P concentrations were found in the evergreen species. In both phenological groups, N and P concentrations and the N:P ratios were higher in the wet season (November) than in the dry season (June).Key words -chlorophylls, phenology, savanna, specific leaf area RESUMO -(Variações sazonais nas concentrações de pigmentos e nutrientes em folhas de espécies de cerrado com diferentes estratégias fenológicas). Vários estudos têm procurado estabelecer relações entre as condições ambientais e as propriedades foliares. Neste trabalho foram medidas as concentrações de pigmentos (clorofilas a, b, carotenóides e antocianinas), N e P e área foliar específica (AFE) em folhas de seis espécies de cerrado (sendo três decíduas e três sempre-verdes) em dois sítios de cerrado stricto sensu com diferenças de cobertura arbustiva-arbórea e em diferentes períodos: início do período seco (junho), fim da seca (setembro) e início das chuvas (novembro). As concentrações de nutrientes variaram mais em função da fenologia e da sazonalidade do que em relação às diferenças estruturais nos sítios, ao contrário do que foi observado para os pigmentos foliares. Os maiores valores de concentração de clorofilas a e b foram encontrados no início (junho) em relação ao final da seca (setembro) nas duas áreas. Em junho, as concentrações de clorofilas a e b foram maiores na área mais densa enquanto a razão clorofila a/b foi menor. A razão clorofila total/carotenóides também foi significativamente maior no cerrado fechado em relação ao aberto nesse período devido às maiores concentrações de clorofilas no primeiro sítio. Espécies decíduas apresentaram maiores médias de AFE e...

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“…Cerrado climate is typically seasonal, with a conspicuous contrast between the dry and rainy seasons (Ferreira et al, 2003). The strong seasonal climate, together with nutrient-poor, aluminiumrich soils, and frequent fires, has imposed environmental pressures on the Cerrado domain (Pivello and Coutinho, 1996;Ferreira et al, 2003), resulting in a wide range of adaptive, phenological strategies, and a rich phytogeographical region of landcover types and biodiversity (Ratter et al, 1997;Ribeiro and Walter, 1998).…”

Section: Introductionmentioning

confidence: 99%

A year in a Cerrado wet grassland: a non-seasonal island in a seasonal savanna environment

Cianciaruso

Batalha

2008

Braz. J. Biol.

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In some Cerrado regions where the water table is superficial and soils are hydromorphic, we may find wet grasslands. We studied temporal changes in some community descriptors, such as species density, plant density, basal area, and cylindrical volume in a Cerrado wet grassland in four different seasons of the year. We also compared the species richness and composition of the wet grassland with a hyperseasonal cerrado, and a seasonal cerrado. We found significant differences among the seasons only for species density. Chao-Sørensen similarity values varied from 0.86 to 0.99 and, in the wet grassland, were not different among the seasons. On the contrary, similarity values between the wet grassland and hyperseasonal and seasonal cerrados were low. Species richness was lower in the wet grassland and higher in the seasonal cerrado. As long as savannas are highly dynamic on all temporal and spatial scales, the wet grassland stability, at least in a short-term view, introduces an important heterogeneity in regional scale. Wet grasslands are also important in the Cerrado domain to increase -diversity, since they are floristically dissimilar with cerrado vegetation.Keywords: diversity, Emas National Park, savanna, seasonality, waterlogging.Um ano em um campo úmido no Cerrado: uma ilha não-estacional em um ambiente de savana estacional ResumoDentro do domínio do Cerrado, os campos úmidos ocorrem em áreas em que o lençol freático é superficial e os solos são hidromórficos. Nosso objetivo foi estudar mudanças temporais em alguns descritores da comunidade, como riqueza de espécies, densidade de espécies, densidade de indivíduos, área basal e volume cilíndrico em um campo úmido em quatro estações do ano. Além disso, comparamos a riqueza e a composição de espécies do campo úmido com um cerrado hiperestacional e outro estacional. Encontramos diferenças significativas entre as estações apenas para a densidade de espécies. Os valores do índice de similaridade Chao-Sørensen variaram entre 0,86 e 0,99 e, no campo úmi-do, não foram significativamente diferentes entre as estações. Porém, a similaridade foi baixa, quando comparamos o campo úmido com os cerrados hiperestacional e estacional. A riqueza de espécies foi menor no campo úmido e maior no cerrado estacional. A estabilidade do campo úmido introduz uma heterogeneidade importante em escala regional, uma vez que as savanas são bastante dinâmicas em escalas espácio-temporais. Os campos úmidos são importantes no domínio do Cerrado por aumentarem a diversidade , já que são dissimilares em relação ao cerrado.Palavras-chave: diversidade, Parque Nacional das Emas, savana, estacionalidade, alagamento.

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Seasonal landscape and spectral vegetation index dynamics in the Brazilian Cerrado: An analysis within the Large-Scale Biosphere–Atmosphere Experiment in Amazônia (LBA)

Cited by 107 publications

References 14 publications

Monitoring Natural Ecosystem and Ecological Gradients: Perspectives with EnMAP

Monitoring Natural Ecosystem and Ecological Gradients: Perspectives with EnMAP

Variações sazonais nas concentrações de pigmentos e nutrientes em folhas de espécies de cerrado com diferentes estratégias fenológicas

A year in a Cerrado wet grassland: a non-seasonal island in a seasonal savanna environment

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