Studies in applied ecology. I. A statistical analysis of regeneration following protection from grazing

Pidgeon, I.M.; Ashby, E.

Proc. Linn. Soc. N.S.W 65: 123-43

1940


Accession: 013511283

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Summary
A comparative study has been made at Broken Hill of the vegetation of reserves protected from grazing and of the adjacent unfenced grazed commons. The quantitative analysis includes observations on (1) the relation between species and area, and (2) the density and distribution of individual species in fenced and unfenced areas. Protection from grazing during a period of less than 2 years has been (1) to increase markedly the growth of the individuals present before fencing; increase in the height of Stipa is mainly responsible for visible differences between fenced and unfenced sections in lightly grazed areas; (2) to increase density of perennial individuals in heavily grazed areas; (3) to decrease the density of three of the most undesirable species, namely, Malva, Lotus and Argemone, which apparently cannot withstand competition; (4) to reduce in good seasons the mean density of annuals by competition with robust perennials, and (5) to increase the variety of perennial and annual species.