Impactos das mudanças de cobertura vegetal nos processos de superfície na região semiárida do Brasil

Cunha, Ana Paula; Alvalá, Regina Célia dos Santos; Sampaio, Gilvan

doi:10.1590/s0102-77862013000200003

Cited by 25 publications

(24 citation statements)

References 28 publications

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“…However, despite degradations, these forests still have high levels of diversity and endemism. It is worth mentioning that few areas were protected in conservation units, making preservation of natural genetic resources even more important for the maintenance of this biodiversity (Burger & Delitti, 2008;Cunha et al, 2013;CGEE, 2016). Considering the high number of ecosystem services provided by these forest formations to their environment such as regional temperature regulation, water bodies maintenance and nutrient cycling, studies related to these themes are fundamental for the maintenance and conservation of these forest formations.…”

Section: Introductionmentioning

confidence: 99%

Nutrition of tree species in tropical dry forest and rainforest environments

et al. 2020

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Knowledge of the nutritional efficiency of species can help revegetation of forest areas, guiding the use of species that best adapt to environmental humidity, altitude and diversity. The objective of this study was to evaluate the nutrient utilization efficiency of N, P, K, Ca and Mg of dominant species in tropical dry forest and rainforest environments. The work was carried out in two areas, both in Pernambuco state, characterized as: Tropical Dry Forest of Caatinga and Tropical Rainforest of Atlantic Forest. A floristic and phytosociological survey was carried out. Species with highest density were evaluated, four from the dry forest and three from the rainforest. For each species, leaves of five healthy individuals of similar size were sampled and nutrient contents were determined. Leaf biomass was estimated by allometric equations. Rainforest species were more efficient in the use of N and K, and dry forest species in the use of P and K. In the dry forest environment, the species Pilocarpus spicatus and Guapira oposita stored more nutrients, and in the rainforest, the species Dialuim guianese was more efficient. These species are essential for the balance of ecosystems and the continuous and sustainable cycling of nutrients.

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Section: Introductionmentioning

confidence: 99%

Nutrition of tree species in tropical dry forest and rainforest environments

et al. 2020

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“…However, this assumption cannot occur when addressing issues such as change in land cover and use, global climate change and seasonal global climate phenomena, such as La-Niña and El Niño. Cunha et al (2013) report that in processes related to land use changes, the climate can be affected. Souza and Oyama (2011), , Oliveira (2008) and Xue et al (2004) justify this feature because the atmosphere is sensitive to the characteristics of the land surface.…”

Section: Introductionmentioning

confidence: 99%

“…According to Cunha et al (2013), the impacts of land use changes, such as changes in regional and global climate through biophysical and biogeochemical processes, may be especially noticeable because of the changes related to surface radiative properties (albedo). The energy balance and the exchange of sensible and latent heat between the surface and the atmosphere can be strongly affect by changes in land-use.…”

Section: Introductionmentioning

confidence: 99%

“…However, this assumption cannot occur when addressing issues such as change in land cover and use, global climate change and seasonal global climate phenomena, such as La-Niña and El Niño. Cunha et al (2013) report that in processes related to land use changes, the climate can be affected. Souza and Oyama (2011), Yanagi and Costa _________________Revista Brasileira de Climatologia_________________…”

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Trends in the Hydrometeorological Regime on an Island in the South Atlantic Ocean (Tendências No Regime Hidrometeorológico Em Uma Ilha Oceânica No Oceano Atlântico Sul)

Durães

Mello

Beskow

2016

ABClima

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ABSTRACT:The aim of this study was to analyze trends in precipitation and temperature on Trindade Island, South Atlantic Ocean. Time series from 1984 to 2008 for precipitation and from 1958 to 2008 for air temperature were analyzed. The regression analysis and Mann-Kendall test were used to test the trend in annual and seasonal scale of precipitation -January, April, July and October, which represents the middle months of summer, autumn, winter and spring, respectively, as well as for maximum and minimum air temperature. Results indicated that for precipitation time series there was no significant trend, while for minimum air temperature there was a significant trend to decay. In addition, no significant trend was found for maximum air temperature. KEYWORDS:Climatology, Precipitation, Air Temperature. TENDÊNCIAS NO REGIME HIDROMETEOROLÓGICO EM UMA ILHA OCEÂNICA NO OCEANO ATLÂNTICO SUL RESUMO: O objetivo desse estudo foi analisar tendências nas séries históricas de precipitação e temperatura na ilha da Trindade, Oceano Atlântico sul. Foi utilizada uma série histórica de 1984 a 2008 para precipitação e de 1958 a 2008 para temperatura do ar. A análise de regressão e o teste de Mann-Kendall foram utilizados para testar a tendência da precipitação nas escalas anual e sazonal, janeiro, abril, julho e outubro, que representam os meses centrais do verão, outono, inverno e primavera, respectivamente, da precipitação máxima diária anual bem como para análise das séries de temperaturas máxima e mínima anual. Os resultados indicaram que para as séries de precipitação não houve tendência significativa de alteração, enquanto que para a série de temperatura mínima, ocorreu tendência significativa de decaimento. Nenhuma tendência significativa foi identificada para as séries de temperatura máxima do ar. PALAVRAS-CHAVE:Climatologia, Precipitação, Temperatura do Ar. INTRODUCTIONThe assessment and understanding of changes in temporal series of weather elements are one of the most important concerns to understand the impacts of human activities on the environment. Normally, the weather elements are assumed as statistically stationary (ALEXANDRE et al., 2010). However, this assumption cannot occur when addressing issues such as change in land cover and use, global climate change and seasonal global climate phenomena, such as La-Niña and El Niño. Cunha et al. (2013) report that in processes related to land use changes, the climate can be affected. Souza and Oyama (2011), Yanagi and Costa _________________Revista Brasileira de Climatologia_________________

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“…Recentemente, vários modelos têm sido aplicados para o estudo do balanço de energia em áreas de Caatinga, e os dados obtidos são utilizados para analisar possíveis alterações nas trocas entre a superfície e a atmosfera, resultantes da mudança do uso da terra (Paiva & Cavalcanti et al, 2011;Cunha et al, 2013). Porém, pouco se sabe sobre a magnitude e o comportamento desses fluxos em condições de seca intensa.…”

Section: Introductionunclassified

Balanço de energia e controle biofísico da evapotranspiração na Caatinga em condições de seca intensa

Souza

Moura

Sediyama

et al. 2015

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi determinar a variação sazonal dos componentes do balanço de energia e avaliar o controle biofísico da evapotranspiração, em área de Caatinga preservada, em condições de seca intensa. O experimento foi conduzido em 2012, tendo-se utilizado o sistema "eddy covariance", instalado a 16,9 m acima da superfície do solo. Além disso, foram realizadas medidas de temperatura, umidade, radiação solar, saldo de radiação, fluxo de calor no solo e temperatura do solo. Os dados dos fluxos de calor sensível e latente foram processados com o programa Alteddy e analisados em escalas diária e sazonal. Com os dados do fluxo de calor latente, foram determinados os valores da evapotranspiração, bem como os indicadores da sua sensibilidade às condições ambientais: fator de desacoplamento, e resistências aerodinâmica e da superfície. O saldo de radiação apresentou forte sazonalidade, com comportamento dependente da radiação solar. A partição dos componentes do balanço de energia revelou que a ocorrência de seca intensa maximiza a destinação da energia disponível ao fluxo de calor sensível, e que a evapotranspiração nessa condição é especialmente dependente do deficit de pressão de vapor e da resistência da superfície.Termos para indexação: eddy covariance, fator de desacoplamento, fluxo de calor sensível, resistência de superfície, vegetação natural. Energy balance and evapotranspiration biophysical control in Caatinga under intense drought conditionsAbstract -The objective of this work was to determine seasonal variation in energy balance components and to evaluate the biophysical control of evapotranspiration in a preserved Caatinga area, under intense drought conditions. The experiment was conducted in 2012, using the eddy covariance system, installed at 16.9 m above soil surface. In addition, temperature, humidity, solar radiation, net radiation, soil heat flux, and soil temperature were measured. Data on the sensible and latent heat fluxes were processed with the Alteddy software and analyzed on daily and seasonal scales. Using the latent heat flux data, the evapotranspiration rates were determined, as well as the indicators of their sensitivity to environmental conditions: decoupling factor, and aerodynamical and surface resistances. The net radiation showed a strong seasonality, with behavior dependent on solar radiation. The partition of the energy balance components revealed that the occurrence of intense drought maximizes the destination of the available energy to sensible heat flux, and that evapotranspiration under this condition is specifically dependent on the vapor pressure deficit and on the surface resistance.

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Impactos das mudanças de cobertura vegetal nos processos de superfície na região semiárida do Brasil

Cited by 25 publications

References 28 publications

Nutrition of tree species in tropical dry forest and rainforest environments

Nutrition of tree species in tropical dry forest and rainforest environments

Trends in the Hydrometeorological Regime on an Island in the South Atlantic Ocean (Tendências No Regime Hidrometeorológico Em Uma Ilha Oceânica No Oceano Atlântico Sul)

Balanço de energia e controle biofísico da evapotranspiração na Caatinga em condições de seca intensa

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