Erodibility of a krasnozem.

Briggs, H. S. (1970). Erodibility of a krasnozem. Master's Thesis, School of Land, Crop and Food Sciences, The University of Queensland.

       
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Author Briggs, H. S.
Thesis Title Erodibility of a krasnozem.
School, Centre or Institute School of Land, Crop and Food Sciences
Institution The University of Queensland
Publication date 1970
Thesis type Master's Thesis
Supervisor Dr. W.E. Fox
Dr. J.D, Hughes
Total pages 62
Language eng
Subjects 07 Agricultural and Veterinary Sciences
Formatted abstract
 An examination was made of the role of rainfall and runoff in soil loss from a krasnozem. Treatments included those of rainfall alone, runoff alone and rainfall and runoff together. 


Major soil losses were obtained when rainfall and runoff was applied simultaneously, minor losses occurred from rainfall and runoff alone.

Using rainfall and runoff together, the effect of cultivation on the soil properties determining the erodibility of a krasnozem was studied.

It was found that cultivation increases the erodibility of this soil and has more effect on the soil properties that affect infiltration rate than detachability.

Aggregate stability studies demonstrated that changes in infiltration rate were correlated with changes in the stability of the soil aggregates to immersion wetting. Aggregates in the soils surface 1cm layer when wetted by high intensity rainfall behaved in a manner similar to when immersion wetted.

It is concluded that infiltration rate is determined by the water stability of soil in the surface 1cm layer.

Breakdown of the aggregates was due to air entrapment rather than raindrop impact.

Soil conservation measures should be aimed at maintaining a high infiltration rate while preventing rainfall from making direct contact with any runoff water.

Keyword Soil erosion.

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Fri, 29 Apr 2011, 12:12:38 EST by Ning Jing on behalf of The University of Queensland Library