Modeling water and ion fluxes in a highly structured, mixed-species stand

Zirlewagen, Dietmar; Wilpert, Klaus von

doi:10.1016/s0378-1127(00)00522-3

Cited by 64 publications

(45 citation statements)

References 22 publications

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“…This confirms the observations by Gray et al (2002) in gaps in mature Douglas-fir forests in the Pacific Northwest (USA); by Cutini et al (2004) in gaps in silver fir stands in Cent ral Apennines (Italy) and by Ritter et al (2005) in gaps of beech-dominated forest in Denmark. Soil water values are higher in the gaps than in the surrounding forest probably in relation to both an increase in precipita tion and a decrease in transpiration in the gaps (Zirlewagen & von Wilpert 2001, Zhu et al 2003.…”

Section: Soil Moisturementioning

confidence: 92%

Effects of gap size and within-gap position on seedlings establishment in silver fir stands

Albanesi¹,

Gugliotta²,

Mercurio³

et al. 2008

iForest

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Section: Soil Moisturementioning

confidence: 92%

Effects of gap size and within-gap position on seedlings establishment in silver fir stands

Albanesi¹,

Gugliotta²,

Mercurio³

et al. 2008

iForest

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“…Further information on experiment variables, instrumentation, and measurements (suction-cup technique, tensiometry, etc. ), as well as water-budget modeling can be found in detail elsewhere (von Wilpert et al, 2000;Zirlewagen and von Wilpert, 2001). …”

Section: Study Site Experimental Design and Instrumentationmentioning

confidence: 99%

“…1, below): Data gaps in the time series have been closed using autoregressive time-series techniques according to PROC AUTOREG in SAS 9.1.3 (Zirlewagen and von Wilpert, 2001;Zirlewagen, 2003b;SAS, 2004). For calculating Gapon coefficients, we used soil-solution data at depths of 15 to 120 cm, and for calculating ion fluxes at a depth of 45 cm (which is the main target depth in this study).…”

Section: Time Series: Soil-solution Chemistry and Water Budget Modelsmentioning

confidence: 99%

“…The water fluxes were calculated by the 1D Richard's model WHNSIM (Huwe and Totsche, 1995) for the time period 1991-2006. For each of the structure variants WHNSIM was parameterized by soilphysical characteristics (pF curve, water conductivity), meteorological, and soil-physical measurements (water content, matrix potential, relative air humidity, air temperature, global radiation, precipitation; Zirlewagen and von Wilpert, 2001). …”

Section: Time Series: Soil-solution Chemistry and Water Budget Modelsmentioning

confidence: 99%

“…For the calculation of water flux, the same soil physical properties were assumed to be valid for the whole area as measured for subjectively selected soil profiles. The water fluxes varied according to crown density and tree-species distribution derived from aerial photos (Zirlewagen and von Wilpert, 2001; Fig. 2).…”

Section: Modeling Spatio-temporal Fluxesmentioning

confidence: 99%

See 2 more Smart Citations

Upscaling spatio‐temporal patterns of cation fluxes in acid forest soils

Zirlewagen

Wilpert²

2010

Z. Pflanzenernähr. Bodenk.

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One main problem with current research on spatio-temporal modeling of ion fluxes in forest soils is the separation of space and time effects in the soil-monitoring concept. This article describes an approach to overcome this weakness. Time trends of point information on soil-solution data (base-cation concentrations and fluxes) are scaled by linking them to soil-chemical data which is available in higher spatial resolution and can be upscaled to an area base. This approach is based on a combined evaluation of bulk soil and soil-solution data using both statistical and process-oriented methods. Multiple-linear-regression analyses coupled with geostatistics were developed to predict spatial patterns of exchangeable cation percentages. In a second step, empirical ion-distribution coefficients were adapted according to Gapon using data of suctioncup plots and bulk-soil samples. Seasonally adjusted time-series data of soil-solution chemistry were then connected with the maps of the predicted exchangeable-cation percentages by means of the Gapon equations. This evaluation step provided both time-and space-dependent maps of cation concentrations in the soil solution. Finally, using the results of a water-budget model it was possible to derive spatio-temporal patterns of soil cation fluxes. Methodological limitations and the results of verification processes are discussed. The methods described can only be used in acidic soils and should not be used in soil layers rich in humus, since adsorption to C compounds differs from adsorption to clay minerals. The time increments of the models should be not shorter than yearly in order to suppress annual periodicity. Although the Gapon equations were not based on laboratory-determined exchange solutions at quasi-equilibrium, but rather on field data from the suction-cup technique, the exchangeable-cation percentages showed steady functions of selectivity coefficients. The methods tested at a watershed scale may be flexible enough to be applied at other scales as well.

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Temporal persistence of throughfall heterogeneity below and between the canopies of juvenile lodgepole pine (Pinus contorta)

Carlyle-Moses

Lishman

2015

Hydrological Processes

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Abstract:From May to October 2010, throughfall associated with 38 rainfall events in three below-canopy zones (inner canopy, midcanopy and canopy periphery) of nine juvenile lodgepole pine trees and in open areas between canopies was measured along north, south, east and west transects radiating from each tree bole. Median cumulative throughfall (%) significantly differed among the canopy zones under differing rain depth classes and was negatively correlated with tree size metrics, but only for certain combinations of canopy zones and rain depth classes. Although median cumulative throughfall (%) was negatively correlated with canopy cover fraction when all below-canopy gauges were considered, this relationship only held true for the inner-canopy and mid-canopy zones under relatively small rain depth classes. Additionally, cumulative throughfall (%) was often dependent on transect direction, with event throughfall showing a dependence on the direction of storm origin. Throughfall coefficient of variation (%) also varied by zone and was a function of not only rainfall depth but also other storm variables such as the maximum 30-min rainfall intensity and the number and duration of intra-storm breaks. Temporal persistence of throughfall was assessed using time stability plots and Spearman rank coefficients of rain event and depth class pairings for all gauges and by canopy zone, and the influence of temporal lag and meteorological variables on persistence was assessed. The implications of our findings on throughfall sampling and for future ecohydrological studies in juvenile lodgepole pine and similar stands are discussed.

show abstract

Modeling water and ion fluxes in a highly structured, mixed-species stand

Cited by 64 publications

References 22 publications

Effects of gap size and within-gap position on seedlings establishment in silver fir stands

Effects of gap size and within-gap position on seedlings establishment in silver fir stands

Upscaling spatio‐temporal patterns of cation fluxes in acid forest soils

Temporal persistence of throughfall heterogeneity below and between the canopies of juvenile lodgepole pine (Pinus contorta)

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