Temporal dynamics of soil moisture in a northern temperate mixed successional forest after a prescribed intermediate disturbance

He, Lizhong; Ivanov, V. Y.; Bohrer, Gil; Thomsen, Julia E.; Vogel, Christoph S.; Moghaddam, Mahta

doi:10.1016/j.agrformet.2013.04.014

Cited by 47 publications

(61 citation statements)

References 60 publications

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“…It is most likely that the larger discrepancy between E C and LE in the treatment plot was related to increased understory transpiration, due to increased light penetration through the more open canopy that characterizes the disturbed plot . In their study of soil moisture in these same plots, He et al [2013] similarly found ET to be lower in the treatment plot, but that enhanced soil evaporation was not sufficient to completely offset the difference in total LE. Between the two plots, there were relatively small differences in atmospheric conditions (VPD, temperature, and pressure) such that, in accordance with our g sj -g sj ′ analysis,~7-19% of the differences in water flux between plots could be attributed to the differences in forcing.…”

Section: Red Oakmentioning

confidence: 84%

“…Between the two plots, there were relatively small differences in atmospheric conditions (VPD, temperature, and pressure) such that, in accordance with our g sj -g sj ′ analysis,~7-19% of the differences in water flux between plots could be attributed to the differences in forcing. He et al [2013] found that canopy interception typically accounted for~11-25% and up to 31% of precipitation in our plots with reduced interception in the disturbance plot. It is unlikely that the lower treatment plot E C could be the outcome of biased species representation among the instrumented trees.…”

Section: Red Oakmentioning

confidence: 99%

“…large regional spatial domains. Disturbances at this scale will impact the heterogeneity of light attenuation through the canopy Schnitzer et al, 2012] and the canopy microclimate, including wind speed, turbulent mixing, humidity, temperature, and soil moisture under the canopy [Asase et al, 2014;Bohrer et al, 2009;Forrester et al, 2012;He et al, 2013;Maurer et al, 2013]. These variables directly affect photosynthesis, canopy evaporative demand, and soil water availability, thereby influencing transpiration.…”

Section: Introductionmentioning

confidence: 99%

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Species‐specific transpiration responses to intermediate disturbance in a northern hardwood forest

et al. 2014

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Intermediate disturbances shape forest structure and composition, which may in turn alter carbon, nitrogen, and water cycling. We used a large-scale experiment in a forest in northern lower Michigan where we prescribed an intermediate disturbance by stem girdling all canopy-dominant early successional trees to simulate an accelerated age-related senescence associated with natural succession. Using 3 years of eddy covariance and sap flux measurements in the disturbed area and an adjacent control plot, we analyzed disturbance-induced changes to plot level and species-specific transpiration and stomatal conductance. We found transpiration to be~15% lower in disturbed plots than in unmanipulated control plots. However, species-specific responses to changes in microclimate varied. While red oak and white pine showed increases in stomatal conductance during postdisturbance (62.5 and 132.2%, respectively), red maple reduced stomatal conductance by 36.8%. We used the hysteresis between sap flux and vapor pressure deficit to quantify diurnal hydraulic stress incurred by each species in both plots. Red oak, a ring porous anisohydric species, demonstrated the largest mean relative hysteresis, while red maple, bigtooth aspen, and paper birch, all diffuse porous species, had the lowest relative hysteresis. We employed the Penman-Monteith model for LE to demonstrate that these species-specific responses to disturbance are not well captured using current modeling strategies and that accounting for changes to leaf area index and plot microclimate are insufficient to fully describe the effects of disturbance on transpiration.

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Section: Red Oakmentioning

confidence: 84%

Section: Red Oakmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Species‐specific transpiration responses to intermediate disturbance in a northern hardwood forest

et al. 2014

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“…Soil moisture and temperature were recorded at four locations at depths of 5, 15, 30, and 60 cm, and at two locations at depths of 100, 200, and 300 cm (Hydra probe SDI-12; Stevens Water Monitoring Systems, Portland, Oregon, USA; He et al 2013). Soil moisture values in each measurement depth were averaged (two to four measurements, depending on depth).…”

Section: Soil Water Potential Measurementsmentioning

confidence: 99%

“…However, because soil moisture at each depth was highly correlated with soil moisture at all other depths, we integrated soil moisture along the 3 m soil column. Soil moisture measurements were converted to soil water potential values (W, MPa) using the Van Genuchten hydraulic parameterization (Van Genuchten 1980) with site specific parameters developed for our site by He et al (2013) and (Matheny et al 2014b). …”

Section: Soil Water Potential Measurementsmentioning

confidence: 99%

Observations of stem water storage in trees of opposing hydraulic strategies

Matheny

Bohrer

Garrity³

et al. 2015

Ecosphere

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Abstract. Hydraulic capacitance and water storage form a critical buffer against cavitation and loss of conductivity within the xylem system. Withdrawal from water storage in leaves, branches, stems, and roots significantly impacts sap flow, stomatal conductance, and transpiration. Storage quantities differ based on soil water availability, tree size, wood anatomy and density, drought tolerance, and hydraulic strategy (anisohydric or isohydric). However, the majority of studies focus on the measurement of storage in conifers or tropical tree species. We demonstrate a novel methodology using frequency domain reflectometry (FDR) to make continuous, direct measurements of wood water content in two hardwood species in a forest in Michigan. We present results of a two month study comparing the water storage dynamics between a mature red oak and red maple, two species with differing wood densities, hydraulic architecture, and hydraulic strategy. We also include results pertaining to the use of different probe lengths to sample water content only within the active sapwood and over the entire conductive sapwood and the outer portion of heartwood in red oak. Both species studied exhibited diurnal cycles of storage that aligned well with the dynamics of sap flux. Red maple, a diffuse porous, relatively isohydric species showed a strong dependence on stored water during both wet and dry periods. Red oak, a ring porous relatively anisohydric species, was less reliant on storage, and did not demonstrate a dependence on soil water potential. Comparison between long and short FDR probes in the oak revealed that oaks may utilize water stored in the innermost layers of the xylem when soil moisture conditions are limiting. We found the FDR probes to be a reliable, functional means for continuous automated measurement of wood water content in hardwoods at a fast time scale. Application of FDR technology for the measurement of tree water storage will benefit forest ecologists as well as the modeling community as we improve our understanding and simulations of plant hydrodynamic processes on a large scale.

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Interannual variability of evapotranspiration and vegetation productivity

Fatichi

Ivanov

2014

Water Resources Research

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Interannual variability of precipitation can influence components of the hydrological budget, affecting them directly and indirectly through adjustments in vegetation structure and function. We investigate the effects of fluctuations of annual precipitation on ecohydrological dynamics. Specifically, we use the advanced weather generator, AWE-GEN, to simulate 200 years of hourly meteorological forcing obtained by imposing four types of precipitation annual process with identical long-term mean. The generated time series force a mechanistic ecohydrological model, Tethys-Chloris. Simulations with perturbed precipitation variability are performed for four locations characterized by different vegetation cover and climate. The results indicate that long-term transpiration (T) and evapotranspiration (ET) fluxes as well as vegetation productivity expressed as Gross Primary Production (GPP) and Aboveground Net Primary Production (ANPP) are essentially unaffected by the imposed climate fluctuations. This finding supports the hypothesis of a relative insensitivity, except for water-limited environments, of interannual evapotranspiration and vegetation productivity to annual climatic fluctuations, which are mostly reflected in the fluxes of deep leakage and runoff. The occurrence of short periods of favorable meteorological conditions randomly taking place within the year was found to be a better explanatory variable for interannual variability of ET and ANPP than average annual or growing season conditions. The results indicated that local, single-site sensitivities are considerably smaller than those observed across climatic and vegetation spatial gradients and thus an important role of ecosystem reorganization in modifying ANPP and ET sensitivity in a changing climate is recognized.

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Temporal dynamics of soil moisture in a northern temperate mixed successional forest after a prescribed intermediate disturbance

Cited by 47 publications

References 60 publications

Species‐specific transpiration responses to intermediate disturbance in a northern hardwood forest

Species‐specific transpiration responses to intermediate disturbance in a northern hardwood forest

Observations of stem water storage in trees of opposing hydraulic strategies

Interannual variability of evapotranspiration and vegetation productivity

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