Water balance and water movement in unsaturated zones of Sphagnum hummocks in Fuhrengawa Mire, Hokkaido, Japan

Yazaki, Tomotsugu; Urano, Shin-ichi; Yabe, Kazuo

doi:10.1016/j.jhydrol.2005.06.037

Cited by 37 publications

(32 citation statements)

References 42 publications

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“…Capillary water will recharge when soil moisture at the upper layer decreased due to evaporation. Yazaki et al (2006) and Chesworth (2008) reported that an amount of water lost due to evapotranspiration was resupplied from deeper layers to the surface. Furthermore, soil water pressures in cutover peat may be below the threshold at which the capillary forces generated by the mosses can extract enough water to offset evaporative losses, preventing recolonization of cutover surfaces (Price and Whitehead 2001;Taylor and Price 2015).…”

Section: Soil Moisture Distributionmentioning

confidence: 99%

Capillary Water Rise in Peat Soil as Affected by Various Groundwater Levels

Nugraha

Annisa

Syaufina

et al. 2017

Indones. J. Agric. Sci.

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Capillary water in peatlands has a very important role in supplying water to the root zone of plants. The current water content in the root zone depends mainly on groundwater levels in some areas with shallow water levels. The study aimed to measure the capillary water dynamics in peat soils at various soil densities and groundwater levels which were observed from the changes in peat color, moisture distribution, water content and hydrophobicity of peat soil. The study was conducted in the greenhouse of Indonesian Swampland Agricultural Research Institute, Banjarbaru, South Kalimantan. The experiment was arranged in a randomized block design with two factors and three replications. The first factor was the bulk density (BD) of peat, namely BD-1 (on actual condition, 0.1 g cm -3 ) and BD-2 (compressed into 0.2 g cm -3 ). The second factor was simulated groundwater levels (GWL) consisting of GWL-1 (-100 cm), GWL-2 (-70 cm) and GWL-3 (-40 cm) from soil surfaces. The results showed that the rise of capillary water in peat soil reached a maximum height of 50 cm which was characterized by the increase in water content at the top layer in the range of 105-127% for BD-1 and 141-181% for BD-2. The highest value of water content (308%) was achieved in the treatment of GWL-3 with BD-2 and the lowest (37%) was in the treatment of GWL-1 with BD-1. The rate of capillary water rose progressively corresponded to the increase in BD value because the number of micropores of BD-2 was greater.

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Section: Soil Moisture Distributionmentioning

confidence: 99%

Capillary Water Rise in Peat Soil as Affected by Various Groundwater Levels

Nugraha

Annisa

Syaufina

et al. 2017

Indones. J. Agric. Sci.

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“…Water capillary flow is the main mass flux within peat (Price et al, 2009) so if the capillary flow is not strong enough to compensate for the evaporation rate, mosses start to dry out. Conversely, if the capillary flow compensates for the evaporation rate (Yazaki et al, 2006), then the vapour diffusion through evaporation can cool the upper peat layer (Carleton and Dunham, 2003). In addition, this can lead to the condensation of vapour in the upper peat layer, which causes a slight increase in peat moisture (Price et al, 2009).…”

Section: Experimental Air Warming Enhances the Discrepancy Of Peat Tementioning

confidence: 99%

Experimental warming differentially affects microbial structure and activity in two contrasted moisture sites in a Sphagnum-dominated peatland

Delarue

Buttler

Bragazza

et al. 2015

Science of The Total Environment

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• Open-Top Chambers were used to raise air temperature by up to 1°C in a peatland.• Interaction between peat temperature and moisture content was investigated.• Impact on peat decomposition was assessed by combining various microbial proxies.• The effect of air warming occurred when comparing distinct moisture sites.• We describe a change in microbial structure and enzymatic activities. a b s t r a c t a r t i c l e i n f o Several studies on the impact of climate warming have indicated that peat decomposition/mineralization will be enhanced. Most of these studies deal with the impact of experimental warming during summer when prevalent abiotic conditions are favorable to decomposition. Here, we investigated the effect of experimental air warming by open-top chambers (OTCs) on water-extractable organic matter (WEOM), microbial biomasses and enzymatic activities in two contrasted moisture sites named Bog and Fen sites, the latter considered as the wetter ones. While no or few changes in peat temperature and water content appeared under the overall effect of OTCs, we observed that air warming smoothed water content differences and led to a decrease in mean peat temperature at the warmed Bog sites. This thermal discrepancy between the two sites led to contrasting changes in microbial structure and activities: a rise in hydrolytic activity at the warmed Bog sites and a relative enhancement of bacterial biomass at the warmed Fen sites. These features were not associated with any change in WEOM properties namely carbon and sugar contents and aromaticity, suggesting that air warming did not trigger any shift in OM decomposition. Using various tools, we show that the use of single indicators of OM decomposition can lead to fallacious conclusions. Lastly, these patterns may change seasonally as a consequence of complex interactions between groundwater level and air warming, suggesting the need to improve our knowledge using a high time-resolution approach.

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“…However, the water from retention and unsaturated zones may be used by evapotranspiration. In a Sphagnum peatland (Fuhrengawa Mire), estimates of water balance showed that an almost identical amount of water lost to evapotranspiration was re-supplied from deeper layers to the surface (Yazaki et al, 2006). Schlotzhauer and Price (1999) showed that the volumetric water content of unsaturated zones has a linear relationship with WT depth.…”

Section: Saturation State Of the Peat (Semax)mentioning

confidence: 99%

A water-table dependent reservoir model to investigate the effect of drought and vascular plant invasion on peatland hydrology

Binet

Gogo

Laggoun‐Défarge

2013

Journal of Hydrology

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To cite this version:Stéphane Binet, Sébastien Gogo, Fatima Laggoun-Défarge. A water-table dependent reservoir model to investigate the effect of drought and vascular plant invasion on peatland hydrology.. Journal of Hydrology, Elsevier, 2013, 499, pp.132-139. 10.1016/j.jhydrol.2013 calculating the stored water in effective porosity of the peat from precipitation and evapotranspiration datasets. Calculations conceptualize vascular plant consumption through a crop coefficient. Changes in water storage, located in the effective porosity of the peat, are described through a maximum infiltration rate and a maximum storage capacity. Water discharges take place in runoff and percolation reservoirs. The runoff coefficient is considered to be water table dependent.This model was tested on a peatland that has experienced strong water table fluctuations caused by summer drought and/or by vascular plant water consumption. A water table dependent runoff model appeared to be adequate to describe the water table fluctuations in peatland. From this model, vascular plants were found to increase the crop coefficient and to limit percolation through the peat. The high water table depth in winter was found to change with the year and is related to an equilibrium between slow infiltration in peat versus percolation plus evapotranspiration. In this disturbed peatland, even if overland flows occurred after a drought, the re-saturation of effective porosity was slow with about 30% of air trapped in the porosity 6 months after the drought period.The effects of drought on peat saturation were observed over more than a single hydrological cycle.This can affect the biogeochemical processes controlling the C cycle in peatland.

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Water balance and water movement in unsaturated zones of Sphagnum hummocks in Fuhrengawa Mire, Hokkaido, Japan

Cited by 37 publications

References 42 publications

Capillary Water Rise in Peat Soil as Affected by Various Groundwater Levels

Capillary Water Rise in Peat Soil as Affected by Various Groundwater Levels

Experimental warming differentially affects microbial structure and activity in two contrasted moisture sites in a Sphagnum-dominated peatland

A water-table dependent reservoir model to investigate the effect of drought and vascular plant invasion on peatland hydrology

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