scholarly journals Interactive comment on “Estimates of tree root water uptake from soil moisture profile dynamics” by Conrad Jackisch et al.

2020 ◽  
Author(s):  
Leander Anderegg
Keyword(s):  
Soil Moisture ◽  
Water Uptake ◽  
Root Water Uptake ◽  
Moisture Profile ◽  
Soil Moisture Profile

scholarly journals Estimates of tree root water uptake from soil moisture profile dynamics

2019 ◽  
Author(s):  
Conrad Jackisch ◽  
Samuel Knoblauch ◽  
Theresa Blume ◽  
Erwin Zehe ◽  
Sibylle K. Hassler
Keyword(s):  
Time Series ◽  
Soil Moisture ◽  
Water Uptake ◽  
Sap Flow ◽  
Water Cycle ◽  
Xylem Sap ◽  
Root Water Uptake ◽  
Soil Conditions ◽  
Diurnal Changes ◽  
Moisture Profile

Abstract. Root water uptake (RWU) as one important process in the terrestrial water cycle can help to better understand the interactions in the soil water plant system. We conducted a field study monitoring soil moisture profiles in the rhizosphere of beech trees at two sites with different soil conditions. We infer RWU from step-shaped, diurnal changes in soil moisture. While this approach is a feasible, easily implemented method during wet and moderate conditions, limitations were identified during drier states and for more heterogeneous soil settings. A comparison with time series of xylem sap velocity reveals that RWU and sap flow are complementary measures of the transpiration process. The high correlation between the sap flow time series of the two sites, but lower correlation between the RWU time series, suggests that the trees adapt RWU to soil heterogeneity and site differences.

scholarly journals Diurnal Method for Evapotranspiration Estimation from Soil Moisture Profile

2014 ◽  
Vol 10 (1) ◽  
pp. 67-75 ◽  
Author(s):  
Zoltán Gribovszki
Keyword(s):  
Soil Moisture ◽  
Water Table ◽  
Water Uptake ◽  
High Water ◽  
New Technique ◽  
Shallow Water Table ◽  
Moisture Profile ◽  
Alder Forest ◽  
Evapotranspiration Estimation ◽  
Soil Moisture Profile

Abstract Water use of plants can be manifested in diurnal signal of soil moisture changes, and also of water table fluctuations in shallow water table environments. The signal can be especially strong in case of groundwater dependent forest vegetation with high water demand, where the water uptake is partly happening across the capillary zone. A new technique for water uptake estimation was elaborated on the basis of high frequency soil moisture profile data taking into account diurnally changing replenishment rate. The method is of great benefit to provide sufficient accuracy without soil specific calibration. The method was tested on the soil moisture dataset of a riparian alder forest in Hidegvíz Valley experimental catchment. Using this new method significantly higher and more realistic water uptake can be calculated compared to the traditional soil moisture method. The method is taking into account soil moisture replenishment from groundwater, which can provide high portion (up to 90%) of evapotranspiration in dry periods. For the above mentioned reason the new technique is recommended to be used for evapotranspiration estimation in groundwater discharge areas, where the traditional methods and simple one-dimensional hydrological models generally work inaccurate.

scholarly journals Estimates of tree root water uptake from soil moisture profile dynamics

2020 ◽  
Vol 17 (22) ◽  
pp. 5787-5808
Author(s):  
Conrad Jackisch ◽  
Samuel Knoblauch ◽  
Theresa Blume ◽  
Erwin Zehe ◽  
Sibylle K. Hassler
Keyword(s):  
Time Series ◽  
Soil Moisture ◽  
Water Uptake ◽  
Water Cycle ◽  
Xylem Sap ◽  
Root Water Uptake ◽  
Soil Conditions ◽  
Diurnal Changes ◽  
Moisture Profile ◽  
Terrestrial Water

Abstract. Root water uptake (RWU), as an important process in the terrestrial water cycle, can help us to better understand the interactions in the soil–plant–atmosphere continuum. We conducted a field study monitoring soil moisture profiles in the rhizosphere of beech trees at two sites with different soil conditions. We present an algorithm to infer RWU from step-shaped, diurnal changes in soil moisture. While this approach is a feasible, easily implemented method for moderately moist and homogeneously textured soil conditions, limitations were identified during drier states and for more heterogeneous soil settings. A comparison with the time series of xylem sap velocity underlines that RWU and sap flow (SF) are complementary measures in the transpiration process. The high correlation between the SF time series of the two sites, but lower correlation between the RWU time series, suggests that soil characteristics affect RWU of the trees but not SF.

scholarly journals Frozen soil parameterization in a distributed biosphere hydrological model

2009 ◽  
Vol 6 (6) ◽  
pp. 6895-6928
Author(s):  
L. Wang ◽  
T. Koike ◽  
K. Yang ◽  
R. Jin ◽  
H. Li
Keyword(s):  
Soil Moisture ◽  
Land Surface ◽  
Hydrological Model ◽  
Frozen Soil ◽  
Surface Radiation ◽  
Moisture Profile ◽  
Flood Peak ◽  
Radiation Fluxes ◽  
Soil Moisture Profile ◽  
The Web

Abstract. In this study, a frozen soil parameterization has been modified and incorporated into a distributed biosphere hydrological model (WEB-DHM). The WEB-DHM with the frozen scheme was then rigorously evaluated in a small cold area, the Binngou watershed, against the in-situ observations from the WATER (Watershed Allied Telemetry Experimental Research). In the summer 2008, land surface parameters were optimized using the observed surface radiation fluxes and the soil temperature profile at the Dadongshu-Yakou (DY) station in July; and then soil hydraulic parameters were obtained by the calibration of the July soil moisture profile at the DY station and by the calibration of the discharges at the basin outlet in July and August that covers the annual largest flood peak of 2008. The calibrated WEB-DHM with the frozen scheme was then used for a yearlong simulation from 21 November 2007 to 20 November 2008, to check its performance in cold seasons. Results showed that the WEB-DHM with the frozen scheme has given much better performance than the WEB-DHM without the frozen scheme, in the simulations of soil moisture profile at the DY station and the discharges at the basin outlet in the yearlong simulation.

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