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A Dielectric–Water Content Relationship for Sandy Volcanic Soils in New Zealand

^a New Zealand Forest Research Institute Ltd., Private Bag 3020, Rotorua, New Zealand (sponsoring organization)
^b HortResearch, Ltd., Private Bag 11-030, Palmerston North, New Zealand

View larger version (20K): [in a new window]   Fig. 1 Map of North Island, New Zealand showing approximate locations of sampled profiles. The dashed line shows the general extent of volcanic soils (Molloy, 1988). Profiles 1 and 2 were in Whakarewarewa Forest, near Rotorua. Profile 3 was on the Whangaehu river floodplain, 20 km south of Mount Ruapehu. Profile 4 was 5 km west of Kawerau, Profile 5 was 5 km southwest of Whangamata, and Profile 6 was 20 km north of Napier. Profile 7 is that sampled by Vogeler et al. 1996, where the soil is an ash-influenced loess

View larger version (22K): [in a new window]   Fig. 2 Ka– calibration data for 17 of the 24 samples (circles) and data from Vogeler et al., 1996 (squares). The best fit, third-order polynomial (Eq. [4]) is also shown, along with the Topp equation (Eq. [1])

View larger version (23K): [in a new window]   Fig. 3 Ka– calibration data for two groups of coarser-textured samples, which consisted of three samples for each group. Best-fit calibration equations, Eq. [5] for the sand-textured soils (dotted line), and Eq. [6] for the gravel soils (dashed line), are also indicated. These groups show dielectric responses that are intermediate between the Topp equation (Eq. [1], lower solid line) and that of the finer ash soils (Eq. [4], upper solid line)