Seasonal soil water storage changes beneath central Amazonian rainforest and pasture

Hodnett, M. G.; Silva, Luciene Pimentel da; Rocha, Humberto Ribeiro da; Senna, Renato Cruz

doi:10.1016/0022-1694(94)02672-x

Cited by 147 publications

(145 citation statements)

References 23 publications

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“…obs.). In line with our hypothesis and with the findings of several other studies we show that soil water availability in the dry season is greatest in deep soil layers (Hodnett et al 1995, Jackson et al 1995, Meinzer et al 1999, Moreira et al 2000, Stratton et al 2000. None of these studies report this trend to be subject to clear temporal variation, as we do here.…”

Section: Seasonal Changes In Plant Water Statussupporting

confidence: 93%

“…While water availability is an important environmental factor for species occurrence in and among tropical forests, studies that actually quantify variation in soil water availability in tropical forests are rare (Becker et al 1988, Hodnett et al 1995, Kursar et al 2005, Lescure & Boulet 1985. In this study we addressed this variation in a tropical dry deciduous forest and a tropical moist semideciduous forest by examining seasonal changes in soil matric potentials along a topographical gradient and with soil depth.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal variation in soil and plant water potentials in a Bolivian tropical moist and dry forest

et al. 2010

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Abstract:We determined seasonal variation in soil matric potentials (ψ soil ) along a topographical gradient and with soil depth in a Bolivian tropical dry (1160 mm y −1 rain) and moist forest (1580 mm y −1 ). In each forest we analysed the effect of drought on predawn leaf water potentials (ψ pd ) and drought response (midday leaf water potential at a standardized ψ pd of −0.98 MPa; ψ md ) of saplings of three tree species, varying in shade-tolerance and leaf phenology. ψ soil changed during the dry season and most extreme in the dry forest. Crests were drier than slopes and valleys. Dry-forest top soil was drier than deep soil in the dry season, the inverse was found in the wet season. In the moist forest the drought-deciduous species, Sweetia fruticosa, occupied dry sites. In the dry forest the short-lived pioneer, Solanum riparium, occupied wet sites and the shade-tolerant species, Acosmium cardenasii drier sites. Moist-forest species had similar drought response. The dry-forest pioneer showed a larger drought response than the other two species. Heterogeneity in soil water availability and interspecific differences in moisture requirements and drought response suggest great potential for niche differentiation. Species may coexist at different topographical locations, by extracting water from different soil layers and/or by doing so at different moments in time.

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Section: Seasonal Changes In Plant Water Statussupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Seasonal variation in soil and plant water potentials in a Bolivian tropical moist and dry forest

et al. 2010

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“…We conducted a first-order assessment of the realism of mechanisms regulating E in the models by comparing the degree to which energy available to evaporate water controlled E, in models Hodnett et al (1995). g Nepstad et al (2002).…”

Section: Atmospheric and Vegetation Controls On Ementioning

confidence: 99%

Mechanisms of water supply and vegetation demand govern the seasonality and magnitude of evapotranspiration in Amazonia and Cerrado

Christoffersen

Restrepo‐Coupe

Arain

et al. 2014

Agricultural and Forest Meteorology

123

119

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“…The plant and/or crop is related closely to land use and influences the redistribution of moisture and solute through transpiration, root water extraction, and growing characteristics, such as leaf area index (LAI), no matter whether they are in dry or wet environment (de Faria and Madramootoo, 1996;Thornes et al, 1996;De Roo et al, 2001), and the different species and class have diverse effects on the soil water storage and redistribution (Hodnett et al, 1995). LAI was used as a good index to calculate the ratio of the transpiration T to ET and then separate T from the soil evaporation E s , which can be measured by micro-lysimeter (Liu and Wang, 1999).…”

Section: Main Factors Affecting the Redistributionmentioning

confidence: 99%

Measurement and analysis of the redistribution of soil moisture and solutes in a maize field in the lower reaches of the Yellow River

Chen

Tang

Sakura

et al. 2004

Hydrological Processes

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Abstract:The lower reaches of the Yellow River are basically a discharge zone with a high salt content, and the study area of Yucheng in Shandong Province became arable only after the water diversion project from the Yellow River was implemented in 1972. The sustainability of agriculture in this area is examined through the redistribution of soil moisture and solutes in the vertical profile based on the measurement of soil moisture, potential and solute content in a maize field at the Yucheng Experimental Station. Diurnal moisture fluctuations appear in the surface layers at 30 and 50 cm depths, and the daily water content at 90 cm depth decreases about a month after planting, due mainly to the effect of root water extraction, even reaching a level lower than that at 70 cm depth. Soil moisture obviously increases for the three layers at 30, 50, 90 cm depth, and the relevant peak-time shifts from the surface 30 cm depth to the deep layer at 120 cm depth with a varied time lag in response to rainfall events, but there is little or no signal for the other layers due to the effects of soil properties, roots, and soil storage. The existence of a convergent zero flux plane may explain to some extent the accumulation of moisture and solutes in the layer at 120 cm depth. Though the chemical facies along the profile from the unsaturated surface to the deep saturated zone generally evolves in a direction of decreasing SO 4 2 and Cl , a strong driving force upward and the accumulation of solute at 120 cm may change the redistribution pattern and three groups of this pattern were classified according to the evolution and concentration distribution profiles. The main factors affecting the moisture, solute and their distributions for the three groups are varied: rainfall, irrigation and evapotranspiration for the surface layer till 70 cm depth, root extraction for the accumulation layer of 70-120 cm depth, and the fluctuation of the groundwater table for the deep layer at 120-200 cm depth. The agriculture appears sustainable as long as diverted water from the Yellow River is available, but the high content of solute accumulation in the layer at about 120 cm depth is a potential risk.

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Seasonal soil water storage changes beneath central Amazonian rainforest and pasture

Cited by 147 publications

References 23 publications

Seasonal variation in soil and plant water potentials in a Bolivian tropical moist and dry forest

Seasonal variation in soil and plant water potentials in a Bolivian tropical moist and dry forest

Mechanisms of water supply and vegetation demand govern the seasonality and magnitude of evapotranspiration in Amazonia and Cerrado

Measurement and analysis of the redistribution of soil moisture and solutes in a maize field in the lower reaches of the Yellow River

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