Evaluating climatic and soil water controls on evapotranspiration at two Amazonian rainforest sites

Fisher, Rosie A.; Williams, Mathew; Ruivo, Maria de Lourdes Pinheiro; Costa, Antonio; Meir, Patrick

doi:10.1016/j.agrformet.2007.12.001

Cited by 63 publications

(63 citation statements)

References 41 publications

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“…The higher Tr in poplar compared to reed is ascribed to the higher Gs in poplar due to the regulating role that leaf stomata play in water loss (Huang et al 2011), as supported by the positive relationship between Gs and Tr observed here and in previous studies (Chen et al 2011). In this study, the Tr and Gs of the 3 vegetated areas did not exhibit seasonal changes similar to SWC, which is consistent with a majority of studies that have found little or no correlation between SWC and Tr (Fisher et al 2008;Wallace and McJannet 2010). However, this finding differs from the dynamics observed in Acacia mangium stands and in a tropical mixed dipterocarp forest, where Gs was higher in wet than in dry conditions (Kumagai et al 2004).…”

Section: Discussionsupporting

confidence: 80%

“…However, this finding differs from the dynamics observed in Acacia mangium stands and in a tropical mixed dipterocarp forest, where Gs was higher in wet than in dry conditions (Kumagai et al 2004). This may be due to the high soil water availability in wetlands, or to the substantial rooting depths that are necessary to provide an adequate water supply during drier periods (Fisher et al 2008). Therefore, the higher Tr and Gs in poplar compared to reed are the key physiological mechanisms underlying the reduction in soil water by poplar, consistent with our second hypothesis.…”

Section: Discussionsupporting

confidence: 77%

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Physiological mechanism for the reduction in soil water in poplar (Populus deltoides) plantations in Dongting Lake wetlands

Qin

Xie

et al. 2013

Wetlands Ecol Manage

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The use of large-scale tree plantations has provoked increasing concern regarding the negative effects on local environments in different ecosystems. However, the physiological mechanism underlying the reduction in soil water by tree plantations in wetlands is not clear. The aims of this study were to investigate the effects of poplar (Populus deltoides) plantations on soil water content and to elucidate the underlying physiological mechanisms. To this end, we conducted a 1-year fixed-plot investigation of soil water content (SWC), plant photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), and water-use efficiency (WUE) of individual leaves of 11-and 5-year-old poplars and of reed (Triarrherca sacchariflora, a native herbaceous plant) in the Dongting Lake wetlands, China. SWC was highest in reed, intermediate in 11-year-old poplar, and lowest in 5-year-old poplar, suggesting that poplar plantations produce a lower soil water content in wetlands. From May to July, Pn was significantly higher in reed than in the two poplar stands, but did not differ between the different-aged poplars. As a whole, Gs and Tr were higher, but WUE was lower, in the poplar stands than in reed during the growing season, indicating that Gs and Tr are the key physiological mechanisms associated with the lower soil water in poplar stands. Relationships among Pn, Gs, and Tr showed positive correlations (P \ 0.01) for each type of vegetation. These data suggest that poplar plantations may cause the transformation of wetlands into dry land due to a lower WUE leading to a massive water loss from soil. This, in turn, would have an influence on community composition and ecosystem function after establishment of the plantations.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionsupporting

confidence: 77%

Physiological mechanism for the reduction in soil water in poplar (Populus deltoides) plantations in Dongting Lake wetlands

Qin

Xie

et al. 2013

Wetlands Ecol Manage

View full text Add to dashboard Cite

show abstract

“…The sensor output was converted to estimates of volumetric soil water content (m 3 m À3 ) using the standard calibration curve from the sensor. For the sand soil, the SWC values were corrected by the calibration equation from Fisher et al (2006b). Soil temperature and soil water content probes were inserted into the soil each time.…”

Section: Complementary Measurementsmentioning

confidence: 99%

Landscape and climatic controls on spatial and temporal variation in soil CO2 efflux in an Eastern Amazonian Rainforest, Caxiuanã, Brazil

Sotta

Veldkamp

Guimarães

et al. 2006

Forest Ecology and Management

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“…ET ranged from 3.6 to 5.1 mm day -1 using the PM 2007 to 2009 in a tropical rainforest in Costa Rica (Cadol et al, 2012). The variation in the TNF is similar to that of other tropical forests when applying the PM model, since high temperatures and radiation create an evaporative demand in the Amazon region, which is usually 3 to 4 mm day -1 (Fisher et al, 2008).…”

Section: Comparison Of Sitesmentioning

confidence: 94%

Evapotranspiration and control mechanisms in managed Amazonian forest in, Par, Brazil

Aguiar¹,

Oliveira²,

Beldini³

et al. 2017

Afr. J. Agric. Res.

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This work examines whether management causes changes in evapotranspiration (ET) surface conductance (g s ), aerodynamic conductance (g a ) and the decoupling factor (Ω) in managed and natural forest sites in a tropical rain forest in the Amazon. The study was conducted in the Tapajós National Forest (FNT) in managed (logged) and natural (unlogged) forests, which have micrometeorological towers for data capture. For ET estimation, the Penman-Monteith (PM) and Eddy Covariance (EC) equations were used. The models were significantly different only for unlogged ( . Each area has different characteristics for the surface variables, g a , g s and Ω, and therefore the sites were different from each other for the study variables. However, logged ET did not differ for the PM, while EC decreased in the year after the management intervention, and was then followed by an increase.

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Evaluating climatic and soil water controls on evapotranspiration at two Amazonian rainforest sites

Cited by 63 publications

References 41 publications

Physiological mechanism for the reduction in soil water in poplar (Populus deltoides) plantations in Dongting Lake wetlands

Physiological mechanism for the reduction in soil water in poplar (Populus deltoides) plantations in Dongting Lake wetlands

Landscape and climatic controls on spatial and temporal variation in soil CO2 efflux in an Eastern Amazonian Rainforest, Caxiuanã, Brazil

Evapotranspiration and control mechanisms in managed Amazonian forest in, Par, Brazil

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