Full TGIF Record # 31162
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Web URL(s):http://www.jstor.org/stable/pdf/10.2307/2261301.pdf
    Last checked: 01/14/2016
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Publication Type:
i
Refereed
Author(s):Bullock, J. M.; Hill, B. Clear; Silvertown, J.
Title:Tiller dynamics of two grasses - responses to grazing, density and weather
Source:Journal of Ecology. Vol. 82, No. 2, June 1994, p. 331-340.
Publishing Information:Blackwell Scientific Publications
# of Pages:10
Keywords:TIC Keywords: Agrostis stolonifera; Lolium perenne; Dynamic tests; Tiller density; Rates; Seasons
Abstract/Contents:"The tiller dynamics of the two dominant species in a grassland, Agrostis stolonifera and Lolium perenne, were followed for two years in a field grazing experiment. Sheep grazing was applied in three seasons at two grazing intensities; winter, spring (in both seasons grazed or ungrazed) and summer (hard or light grazed). Tiller densities of both species showed peaks in late summer and troughs in spring due to variation in tiller birth rates. Tiller death rates were not seasonal. Year-to-year weather variation also affected the dynamics. Harder summer grazing increased tiller birth and death rates of both species, increasing tiller turnover, but did not affect tiller densities over the two years by reducing densities on the non winter-grazed paddocks during the late summer months. There were no main effects of spring grazing treatment or interactions among grazing treatments. Tiller birth and death rates were density-dependent, indicating that the populations were regulated. Agrostis generally had higher tiller birth and death rates and therefore had a more rapid tiller tunover than Lolium. Fewer tillers flowered and there was less seedling establishment in the Agrostis populations. However, both species showed similar seasonal dynamics, density-dependent regulation, effects of between year climatic variation and responses to spring and summer grazing treatments. Agrostis showed a significantly greater response to winter grazing. The tiller populations of both species were regulated by density-dependent birth and death rates but showed seasonal dynamics upon which were superimposed effects of grazing treatment and yearly variation in the weather. However, their tiller population numbers were little affected by grazing level in spring or summer. Only grazing in winter decreased their densities and this is the treatment most likely to bring about changes in species composition in the grassland.
Language:English
References:36
Note:Figures
Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bullock, J. M., B. C. Hill, and J. Silvertown. 1994. Tiller dynamics of two grasses - responses to grazing, density and weather. J. Ecol. 82(2):p. 331-340.
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Web URL(s):
http://www.jstor.org/stable/pdf/10.2307/2261301.pdf
    Last checked: 01/14/2016
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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