Soil Moisture Data and Soil-Moisture Retention Curves Description

In addition to the observations of water table development, the 2002 PMRW hillslope dataset quantifies the relative state of wetness of the hillslope. Soil-moisture content was measured with the Aqua-pro radio frequency sensor (Aqua-pro Sensors, Reno, NV; the use of brand names is for information purposes and does not indicate endorsement by the U.S. Geological Survey) over a 4 m x 4 m grid of the hillslope (64 locations) illustrated in Figure 4c and described in detail by Tromp-van Meerveld and McDonnell (2006a). The moisture distributions also can be evaluated with respect to the tree distribution on the hillslope (Figure 12 of Tromp-van Meerveld and McDonnell, 2006c; and also Figure 4d). Measurements were taken at 0.05 cm increments to a depth of 0.3 m and 0.1 cm increments from 0.3 m to the soil-bedrock interface. The data records provided herein include 67 individual surveys from February 2002 to June 2002 at depths of 5, 15, 30, and 50 cm below the soil surface (Datafile 5). The location of each survey point is identified with X, Y coordinates (see DEM). A blank cell indicates an absence of data. The Aqua-pro sensor data are linearly related to volumetric soil moisture content (J.S. Selker, personal communication), but a site-specific calibration is not currently available for the PMRW soils. Integration of the detailed spatial soil moisture data for each X,Y soil profile was performed to provide an estimate of the relative average hillslope state of wetness (see Tromp-van Meerveld and McDonnell, 2006a and Figure 3b). These estimates are provided in the last worksheet of Datafile 5

Moisture retention curves for six 569 cm3 soil cores from the experimental hillslope at depths of 15, 40 and 70 cm were generated in the laboratory on a tension table (Tromp-van Meerveld, unpublished data, 2003). These previously unpublished data are provided in Datafile 6.

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