A comparative analysis of the flooding and fire effects on the energy exchange in a wetland community (Morichal) of the Orinoco Llanos

Jose, Juan; Meirelles, M. L.; Bracho, Rosvel; Nikonova, Nina

doi:10.1016/s0022-1694(00)00392-9

Cited by 26 publications

(18 citation statements)

References 68 publications

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“…Pioneer studies in Brazillian savanna were reported by Miranda et al (1997) in a Cerrado Sensu stricto in the central region, and by Vourlitis et al (2001) in a Cerradão vegetation at the ecotone between tropical savanna and rain forest in Central Brasil. Related investigations in South America about water cycle and carbon stocks in tropical savanna were developed in Venezuela (San Jose et al 2001;Szarzynsky and Anhuf et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Measurements of CO2 exchange over a woodland savanna (Cerrado Sensu stricto) in southeast Brasil

et al. 2002

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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 possibly as a realistic one, giving the constraining conditions imposed to the turbulent flux calculation, and favourable hypothesis of succession stages, climatic variability and CO fertilization. Agosto) e na estação chuvosa, respectivamente, por um padrão de sensível correlação com a temperatura (Q =4.9) e 10 umidade do solo. Com base nos fluxos atmosféricos de CO , a PLE mostrou uma variabilidade no ciclo diurno grandemente 2 controlada pela radiação solar, umidade e temperatura do ar. Na escala sazonal, a umidade do solo foi uma variável de alta correlação com a PLE, que aparentemente induziu a queda de folhedo, redução da atividade fotossintética e da respiração -do solo. O sinal da PLE foi negativo (sumidouro) na estação chuvosa e no início da estação seca, com taxas de -25 kgChadia , e máximos de até 40 kgCha dia . Na estação seca o sinal foi positivo (emissão), o que foi revertido logo no início das chuvas. No fim da estação seca, em dias de grande estresse hídrico, ainda observou-se a resposta da fotossíntese na escala do ecossistema, mesmo tendo sido positiva a PLE. Paralelamente ao decorrer da estação seca, a PLE progressivamente

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Section: Introductionmentioning

confidence: 99%

Measurements of CO2 exchange over a woodland savanna (Cerrado Sensu stricto) in southeast Brasil

et al. 2002

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“…The environmental parameters (including net radiation, air temperature, and wind speed) significantly reflect the seasonal variation in ET in different wetland ecosystems [74][75][76][77]. The water level has only a small effect on variation in ET in a wetland with a constantly inundated area [15,78].…”

Section: Combined Influences Of Variables On Et In the Poyang Lake Wementioning

confidence: 99%

Lake Fluctuation Effectively Regulates Wetland Evapotranspiration: A Case Study of the Largest Freshwater Lake in China

Zhao

Liu

2014

Water

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Lakes and wetlands provide valuable water resources. Wetland evapotranspiration (ET) is a key hydrologic component; however, the effects of lake fluctuation on wetland ET remain unclear. The Poyang Lake is the largest freshwater lake in China and experiences a dramatic fluctuation in water level and inundated area. This study used remote sensing data to estimate the wetland ET for Poyang Lake and to illustrate the distribution of wetland ET and its response to lake fluctuations. Our results showed that wetland ET was related to lake fluctuation both spatially and temporally. Within the same year, the difference between annual water evaporation (E water ) and wetland ET (ET wetland ) was primarily attributed to lake fluctuation through its effects on inundated area and exposure days. A 1% increase in inundated area would result in a 7.87 ± 1.13 mm a −1 reduction in annual E water -to-ET wetland differences, and a 10-day elongation of exposure could lead to an 11.1 ± 1.6 mm a −1 increase in annual E water -to-ET wetland differences, on average. Inter-annually, the E water -to-ET wetland differences were attributed to the combined effects of atmospheric and environmental variables and lake fluctuation. The lake fluctuation contributed 73% to the inter-annual ET difference, followed by relative humidity (19%), net radiation (5%), and wind speed (4%). Overall, lake fluctuation effectively regulates wetland ET, and its effect should receive careful consideration in hydrological and water resources studies under the current changing climate.

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“…Wright, 1912) and regularly interspersed among lower, more open peat sloughs. Ridges were dominated by sawgrass (Cladium jamaicense), sloughs by open water or water lilies (Nymphaea odorata), Landscape Change in the Everglades Ridge,Slough,and Tree Island Mosaic 347 the ridge and slough landscape is parallel to the dominant flow direction-a feature shared with several other subtropical wetlands, including parts of the Zapata Peninsula in Cuba, Yucatan Peninsula in northern Belize, morichal wetlands in Colombia and Venezuela (San Jose et al, 2001), and buritizal wetlands in the Brazilian Pantanal (Silva et al, 1999). That these paralleldrainage wetlands are in a quasiequilibrium state is somewhat surprising, given the positive feedback between flow, sediment transport, and channel morphology that often causes channel coalescence and development of a dominant channel network on low gradients (Phillips and Schumm, 1987).…”

Section: Introductionmentioning

confidence: 99%

Recent and Historic Drivers of Landscape Change in the Everglades Ridge, Slough, and Tree Island Mosaic

Larsen

Aumen

Bernhardt

et al. 2011

Critical Reviews in Environmental Science and Technology

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A comparative analysis of the flooding and fire effects on the energy exchange in a wetland community (Morichal) of the Orinoco Llanos

Cited by 26 publications

References 68 publications

Measurements of CO2 exchange over a woodland savanna (Cerrado Sensu stricto) in southeast Brasil

Measurements of CO2 exchange over a woodland savanna (Cerrado Sensu stricto) in southeast Brasil

Lake Fluctuation Effectively Regulates Wetland Evapotranspiration: A Case Study of the Largest Freshwater Lake in China

Recent and Historic Drivers of Landscape Change in the Everglades Ridge, Slough, and Tree Island Mosaic

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