Salinity Classification – Severe (subsoil salinity 16-32 dS/m ECe)

Such sites are only suitable for highly salt tolerant plants. There will usually be significant areas of bare ground and it is likely that salt crystals will form on the soil surface over summer. Waterlogging is common, and trees will usually be dead or dying. Low/moderate waterlogging would indicate that that the watertable was not consistently above 0.1m in winter or 0.7m in summer.

Indicator species for low/moderate waterlogging:

Samphire, curly ryegrass, marine and saltwater couch, ice plant, streaked arrow grass, salt sand spurrey, sea barley grass, old man saltbush, bare ground.

 

Salinity Classification – Extreme (subsoil salinity 16-32 dS/m ECe)

Only the most salt and waterlogging tolerant species can survive at these salinity levels and saltland pastures are not an option. Low/moderate waterlogging would indicate that that the watertable was not consistently above 0.1m in winter or 0.7m in summer.

Indicator species for low/moderate waterlogging:

Mostly bare ground and extensive salt crystallisation at the soil surface.

 

Download the 'nypa scale' conversion chart

Table 2. Suggested classification system for categorisation of soil salinity in Australia (Barrett-Lennard et al. 2008b)

SUGGESTED
TERM
ECe RANGE
(dS/m)
FOR SANDS EC1:5 RANGE
FOR LOAMS
FOR CLAYS TYPICAL PLANTS
AFFECTED
Non-saline 0-2 0–0.14 0–0.18 0–0.25 -
Low salinity 2–4 0.15–0.28 0.19–0.36 0.26–0.50 Beans
Moderate salinity 4–8 0.29–0.57 0.37–0.72 0.51–1.00 Barley
High salinity 8–16 0.58–1.14 0.73–1.45 1.01–2.00 River saltbush,
saltwater couch
Severe salinity 16–32 1.15–2.28 1.46–2.90 2.01–4.00 Puccinellia
Extreme salinity >32 >2.29 >2.91 >4.01 Samphire

For more information on indicator species, see the SALTdeck Cards