New Zealand Journal of Agricultural Research abstracts
Sustainability of high-country pastures under contrasting
development inputs. 9. Vegetation dynamics
D. Scott
AgResearch
PO Box 60
Lincoln 7640, New Zealand
scottd_hc@xtra.co.nz
Abstract Changes in pasture composition
over 24 years are
reported for two grazed multiple-species mixture trials on a
high-country soil. Quantified response equations (34) between different
plant species ranking, vegetation types, time, fertiliser and grazing
input treatments for 19 years are reported depending on whether
estimation is of “species from environment” (species response from
treatment variables) or “environment from species” (treatment variables
from species composition). Species abundance and vegetation type were
primarily determined by S and P fertiliser levels, duration of
development, and only secondarily by relative stocking rate or grazing
method. Species dominance and vegetation continued to change over time.
Lupinus polyphyllus was dominant over most of the period at low
fertiliser input levels, while Trifolium ambiguum increased
steadily to dominate in the higher fertiliser input levels during the
second decade, with both as sustainable pasture species options.
Keywords grazing management; high country;
New Zealand;
response functions; vegetation
A05058; Online publication date 6 July 2007; Received 24 November
2005; accepted 15 March 2007
New Zealand Journal of Agricultural Research, 2007, Vol. 50:
393–406
0028–8233/07/5003–0393 © The Royal Society of New Zealand 2007
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