A digital soil map of Phytophthora cinnamomi in the Gondwana Rainforests of eastern Australia

Utilizing a DUALEM‐421 and inversion modelling to map baseline soil salinity along toposequences in the Hunter Valley Wine district

“…DUALEM and EC a data collection in the field EC a data from a DUALEM-421 (Dualem Inc., Milton, Ontario, Canada) were collected down a toposequence ( Figure 1) and along three transects; T1, T2 and T3 ( Figure 1). These were selected based on a map of the areal distribution of EC a (0-0.5 m) and to capture a range of EC a along toposequences (Stockmann et al, 2012). EC a was recorded with positioning information from an Omnistar High Precision DGPS.…”

Sampling design optimization for geostatistical modelling and prediction

“…This di erence may be explained by the large number of soil forming factors in uencing spatial variation of gamma K. For example, Viscarra Rossel et al (2007) showed that gamma K is mostly determined by soil minerals and soil particle size, with some e ects of soil moisture and bulk density. In our case study, the area is covered by a wide range of parent materials, such as lithic sandstone, siltstone, mudstone, shale, limestone and volcanic rocks; as well as a large number of soil types such as Red Dermosols, followed by Brown, Black and Grey Dermosols (Kovac and Lawrie, 1991;Stockmann et al, 2012). These contrasting soil types and parent materials lead to large spatial variation of soil mineralogy and soil particle size, as well as soil moisture characteristics.…”

“…Apparently, residual variation is greater at high elevation and shallow slopes. Stockmann et al (2012) notes that the top-of-hill vineyards were irrigated during the survey. This might have led to an increase of the local variance with elevation, since TWI does not account for this unexpected arti cial process (re ected in Fig.…”

“…This yielded a raster le of 10 m × 10 m resolution of gamma-radiometric potassium (K) expressed in cps. The data collection procedure is detailed in Stockmann et al (2012).…”