Environmental Factors Influencing Semidesert Grassland Perennial Grass Demography

Wright, Robert; Dyne, George M. Van

doi:10.2307/3669712

Cited by 51 publications

(34 citation statements)

References 23 publications

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“…One expects marked differences between disclimax grasslands in which annual species and short-lived perennials dominate compared with climax grasslands such as those dominated by species of the perennial grasses Astrebla, Triodia, Heteropogon and Themeda. The demographic information already available, for example in Williams & Roe (1975), Williams (1977), Crisp & Lange (1976), Crisp (1978), Michalk & Herbert (1978), Davies & Walsh (1979) for Australian species, and in Young & Evans (1974), Wright & Van Dyne (1976), 209 Norton (1978 and West et al (1979) for north American species can then be used to extrapolate to related communities. The review by Hodgkinson & Williams (1980) and in particular the field studies by Jones & Mott (1980) which elucidate the demographic picture for sown pasture species in new environments also indicate how other information can be incorporated.…”

Section: Discussionmentioning

confidence: 99%

Grassland dynamics under sheep grazing in an Australian Mediterranean type climate

1981

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Grassland dynamics in a degraded disclimax grassland dominated by Danthonia caespitosa Gaudich. are examined using both demographic and multivariate approaches in an experiment designed to determine the effect of grazing intensity and exclosure on pasture dynamics. The experiment ran for 20 years from 1949 to 1968, using permanent quadrats at 3 grazing intensities and within exclosures. Demographic studies of some perennial grass species demonstrated markedly different responses to grazing; Danthonia caespitosa was unaffected by grazing but responsive to seasonal rainfall differences. Enteropogon acicularis survived only o n protected sites. Numerical classification of total species set (121 species) for six observation periods demonstrated that community types were sensitive to differences in winter rainfall, and time since the start of experiment. Principal component analysis of permanent quadrat observations for individual years demonstrates quadrat trajectories which confirm this and indicate progressive divergence of the successional trends of the grazed and ungrazed quadrats. Repeated analysis on grazed quadrats only, shows that three components of pasture dynamics can be recognized; these are trend (succession?) and seasonal differences, each of which account for about 20% of the variance, and differences due to soil heterogeneity in the experimental paddock (8% of variance accounted for). No effect of grazing intensity was detected. Multivariate techniques can provide a clear partitioning of types of dynamic behaviour present in grassland communities. It is concluded that partitioning of environmental heterogeneity prior to demographic studies would increase their sensitivity. Vegetatio 47, 201-211(1981). 0042 3106/81/0471 0201/$2.20.

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Section: Discussionmentioning

confidence: 99%

Grassland dynamics under sheep grazing in an Australian Mediterranean type climate

1981

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“…Torr.) in an arid grassland (Bird et al, 2002), even though plants of that species can live at least 28 y (Wright and Van Dyne, 1976).…”

Section: Introductionmentioning

confidence: 99%

Soil carbon and nitrogen in relation to shrub size and death in a semi-arid grassland

et al. 2008

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“…A shorter drought period occurs in the autumn. Perennial plants in these environments must cope with relatively short-term drought during rainy seasons, and more predictable and severe long-term drought during the foresummer and the autumn (Wright and Van Dyne, 1976).…”

Section: Introductionmentioning

confidence: 99%

Epidermal conductance as a component of dehydration avoidance in Digitaria californica and Eragrostis lehmanniana, two perennial desert grasses

Smith

Fendenheim

Halbrook

2006

Journal of Arid Environments

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Environmental Factors Influencing Semidesert Grassland Perennial Grass Demography

Cited by 51 publications

References 23 publications

Grassland dynamics under sheep grazing in an Australian Mediterranean type climate

Grassland dynamics under sheep grazing in an Australian Mediterranean type climate

Soil carbon and nitrogen in relation to shrub size and death in a semi-arid grassland

Epidermal conductance as a component of dehydration avoidance in Digitaria californica and Eragrostis lehmanniana, two perennial desert grasses

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