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Assessing Soil Moisture Regimes with Traditional and New Methods

^a Istituto Sperimentale per lo Studio e la Difesa del Suolo, 50121 Firenze, Italy
^b Istituto Sperimentale per il Tabacco, 37051 Bovolone VR, Italy
^c Istituto di Agronomia, Università di Palermo, 90128 Palermo, Italy
^d Istituto Sperimentale per lo Studio e la Difesa del Suolo, 02100 Rieti, Italy

View larger version (22K): [in a new window]   Fig. 1. Location of the experimental sites in Italy.

View larger version (28K): [in a new window]   Fig. 2. Soil moisture regimes following the ICOMMOTR methodology. Mean soil water state is defined as the geometric mean of the negative matric potential at a depth of 0.75 m from the surface. MDWS, mean dry season soil water state; MWWS, mean wet season soil water state; MAWS, mean annual soil water state.

View larger version (23K): [in a new window]   Fig. 3. Volumetric soil water content at the 0.15-m (dot) and the 0.75-m (circle) depths at Bovolone during the period of 1994 through 1998. Arrows indicate summer solstices. Dashed lines indicate average field capacity (F.C.) and wilting point (W.P.) for the two depths.

View larger version (28K): [in a new window]   Fig. 4. Volumetric soil water content at the 0.15-m (dot) and the 0.75-m (circle) depths at Cesa during the period 1994–1998. Arrows indicate summer solstices. Dashed lines indicate average field capacity (F.C.) and wilting point (W.P.) for the two depths.

View larger version (19K): [in a new window]   Fig. 5. Volumetric soil water content at the 0.15-m (dot) and 0.45-m (circle) depths at Rieti during the period of 1994 through 1997. Arrows indicate summer solstices. Dashed lines indicate average field capacity (F.C.) and wilting point (W.P.) for the two depths.

View larger version (22K): [in a new window]   Fig. 6. Volumetric soil water content at the 0.15-m (dot) and 0.75-m (circle) depths at Sparacia during the period of 1994 through 1998. Arrows indicate summer solstices. Dashed lines indicate average field capacity (F.C.) and wilting point (W.P.) for the two depths.

View larger version (28K): [in a new window]   Fig. 7. Soil water potential at the 0.75-m depth (0.45 m depth for Rieti): geometric seasonal mean.

View larger version (20K): [in a new window]   Fig. 8. Soil water potential at the 0.15-m depth: geometric seasonal mean.

View larger version (15K): [in a new window]   Fig. 9. Soil water potential at the 0.15- and 0.75-m depths: geometric mean of the observed years.