Reclamation of a scalded, red duplex soil by waterponding [Darling Riverine Plain, New South Wales].
1989
Ringrose Voase A.J. | Rhodes D.W. | Hall G.F.
Reclamation was studied by comparing profiles under scald, 7-month-old and 22-year-old ponds, as well as under a sandy hummock and a naturally revegetated patch. The scalded soils were generally bare of vegetation and infiltration was slow, causing rainfall to be lost by runoff and evaporation. Under recent ponds, there had been leaching of soluble salts but few other changes. Under older ponds and naturally reclaimed sites, besides leaching, the B horizon had become massive with the formation of large shrinkage cracks on drying. The observations led to the hypothesis that initial revegetation is a result of reduction in runoff and increased infiltration and possibly leaching of soluble salts. For waterponding to cause revegetation, the soils should have a clay subsoil with shrink-swell potential and high sodicity so that restructuring takes place on leaching.
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