2002
DOI: 10.1590/s1676-06032002000100009
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Measurements of CO2 exchange over a woodland savanna (Cerrado Sensu stricto) in southeast Brasil

Abstract: Palavras AbstractThe technique of eddy correlation was used to measure the net ecosystem exchange over a woodland savanna (Cerrado Sensu stricto) site (Gleba Pé de Gigante) in southeast Brazil. The data set included measurements of climatological variables and soil respiration using static soil chambers. Data were collected during the period from 10 to as much as 50 kgC ha day . The annual NEE sum appeared to be nearly in balance, or more exactly a small sink, equal to -1 -1 0.1 0.3 tC ha yr , which we regard … Show more

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Cited by 72 publications
(75 citation statements)
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“…The annual balance indicated a net uptake of about 2.5 Mg C ha -1 yr -1 . In another study, Rocha et al (2002) also showed a net C uptake in a typical cerrado area but to a lower extent (0.1 to 0.3 Mg C ha -1 yr -1 ). These differences could be related to heterogeneity of vegetation in different areas and physiognomies.…”
Section: Soil Co 2 Emissionsmentioning
confidence: 87%
“…The annual balance indicated a net uptake of about 2.5 Mg C ha -1 yr -1 . In another study, Rocha et al (2002) also showed a net C uptake in a typical cerrado area but to a lower extent (0.1 to 0.3 Mg C ha -1 yr -1 ). These differences could be related to heterogeneity of vegetation in different areas and physiognomies.…”
Section: Soil Co 2 Emissionsmentioning
confidence: 87%
“…In general, the studies on the cerrado hydroclimatic variability have been done on large areas (Loraie et al, 2011;Davidson et al, 2012;Oliveira et al, 2014). Evapotranspiration (ET) has been the most intensively studied component of the water balance at the field scale, usually based on eddy covariance methods Santos et al, 2003;da Rocha et al, 2009;Giambelluca et al, 2009) or by the water balance in the soil (Oliveira et al, 2005;Garcia-Montiel et al, 2008). However, other water balance components such as rainfall interception, canopy throughfall, stemflow, surface runoff, infiltration, percolation, subsurface flow and groundwater recharge are poorly understood in the cerrado due to lack of available observations.…”
Section: P T S Oliveira Et Al: the Water Balance Components Of Unmentioning
confidence: 99%
“…A escolha da área de trabalho, ou AITm [região da superfície do solo que as avaliações representam segundo Finnigan (2004) ou o "campo de visão" dos instrumentos da torre, de acordo com Schmid (2002)], foi baseada na predominância, direção e intensidade do vento conforme definida por Rocha et al (2002Rocha et al ( , 2005 e localizase entre 300-400 m da torre em direção leste (110° geográficos) (Figura 1).…”
Section: Definição Do Aitm Da Torre Meteorológica E De Fluxo Na áRea unclassified
“…atmosfera potencialmente tão grande quanto o que é originado do desflorestamento de florestas tropicais (Machado et al 2004). Rocha et al (2002) indicaram que o valor da PPL no Cerrado paulista Pé-de-Gigante constitui um pequeno dreno de carbono (0,1 ± 0,3 tC.ha -1 /ano), similar ao valor encontrado para um Cerrado no Planalto Central do Brasil (Miranda et al 1997), sugerindo que a sazonalidade é o fator determinante na resposta observada, pois induz a senescência foliar com conseqüente redução na atividade fotossintética e queda da produtividade durante a estação seca.…”
Section: Introductionunclassified