Changes in Herbaceous and Suffrutescent Perennials in Grazed and Ungrazed Desertified Grassland in Southeastern Arizona, 1958-1978

Chew, Robert M.

doi:10.2307/2425305

Cited by 68 publications

(37 citation statements)

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“…Shrubs of 1-2 m height, abundant in the ungrazed drainage line, were missing completely in the grazed drainage line. Vegetation cover was higher at the grazed site than at the ungrazed site, showing that different land management had a marked effect on the vegetation (Kleiner & Harper, 1972;Chew, 1982;Roundy & Jordan, 1988;Milton et al, 1992;Fleischner, 1994;Rosenstock, 1996). Within a lower vegetation cover, protection from predation and the availability of food for small mammals is reduced (Cassini & Galanthe, 1992).…”

Section: Resultsmentioning

confidence: 99%

“…Selective grazing and high stocking rates of domestic animals have marked effects on the shaping of vegetation in arid regions (Kleiner & Harper, 1972;Chew, 1982;Roundy & Jordan, 1988;Milton et al, 1992;Fleischner, 1994;Rosenstock, 1996). Desert rodent diversity can be correlated with the complexity of soil and vegetation structures (Rosenzweig & Winacur, 1969;Abramsky, 1978Abramsky, , 1988Kerley, 1992).…”

Section: Introductionmentioning

confidence: 99%

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How livestock grazing affects vegetation structures and small mammal distribution in the semi-arid Karoo

Eccard

Walther²,

Milton

2000

Journal of Arid Environments

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

How livestock grazing affects vegetation structures and small mammal distribution in the semi-arid Karoo

Eccard

Walther²,

Milton

2000

Journal of Arid Environments

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“…Recovery should be rapid if soil erosion has been minimal; with more severe site degradation, however, secondary succession will be slow, following similar stages as primary succession (Stoddart et al 1975, p. 167). Although vegetation recovery has been reported in some studies (e.g., Campbell 1929;Haskell 1945;Potter & Krenetsky 1967;Smith & Schmutz 1975), there is increasing evidence suggesting that such recovery is not the general case (e.g., Costello & Turner 1941;Gardner 1950;Blydenstein et al 1957;Buffington & Herb el 1965;Walker et al 1981;Chew 1982;Hennessy et al 1983).…”

Section: Discussionmentioning

confidence: 99%

Ordination of vegetation change in Guadalupe Mountains, New Mexico, USA

Wester

Wright

1987

Vegetatio

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Vegetation change over a nine-year period was studied in Guadalupe Mountains, New Mexico. Permanent transects in desert shrub vegetation were sampled in 1972 and 1980. Emphasis was given to shrubs because of their importance to big game diets. Univariate paired t-tests and reciprocal averaging ordination were used to detect and display coordinated changes in species composition over time. Despite apparently less browsing pressure in desert shrub vegetation in 1980 there were few significant changes in species composition. In addition, preferred forage species showed reduced reproduction while species of intermediate and poor forage value displayed increased reproduction during this time. These data do not support traditional rangeland succession theory which states that enhanced reproduction of preferred species should follow grazing or browsing pressure reduction.

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“…Several studies have documented patterns during secondary succession in grassland vegetation (e.g., Bassett 1980;Austin et al 1981;Chew 1982;Reichhardt 1982;Collins & Adams 1983;Potvin & Harrison 1984;West et al 1984;Biondini et al 1985). Few generalizations have emerged from these studies, perhaps because vegetation dynamics in arid and semi-arid systems is influenced more by abiotic than biotic factors (MacMahon 1980).…”

Section: Introductionmentioning

confidence: 99%

“…Few generalizations have emerged from these studies, perhaps because vegetation dynamics in arid and semi-arid systems is influenced more by abiotic than biotic factors (MacMahon 1980). For example, Austin et al (1981) indicated that climate had a significant effect on succession in Australian grasslands, and Chew (1982) reported that infrequent climatic events confounded patterns of vegetation change in desert grasslands. Van der Maarel (1981) found a rapid response to wet and dry treatments in dune grasslands.…”

Section: Introductionmentioning

confidence: 99%

Succession and fluctuation in Artemisia dominated grassland

1988

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Vegetation dynamics were studied from 1940 to 1978 in two grazed pastures and associated exclosures in sand sagebrush (Artemisiafilifolia) dominated grassland, western Oklahoma, USA. In both pastures and one exclosure, pattern of vegetation change reflected fluctuation rather than succession. In the other exclosure, the grassland exhibited a directional change from annual grasses and forbs to dominance by perennial grasses. Rate of change was consistent during the 39 year period. Cover of grasses increased more in grazed than ungrazed areas. Grass cover was negatively correlated with high air temperatures early in the growing season. Forb cover remained relatively constant over time and shrub cover peaked during the 1960s. Abundance of annuals and cool season species was positively correlated with rainfall early in the growing season.Species diversity and richness were lowest in the ungrazed areas, as a result of increased dominance by perennial grasses such as Schizachyrium scoparium. In pastures and exclosures, richness was positively correlated with growing season precipitation. Cover of the common species differed among sample areas within years and fluctuated between years. Few general patterns emerged from correlations of environmental variables with cover of individual species. In general, vegetation dynamics in these sand sagebrush grasslands reflect a tradeoff in that total cover changes little over time because the loss of some species is compensated for by increased growth of others. Such trade-offs reflect the individualistic response of the component species within each pasture or exclosure. Although changes in growth form composition were related to climatic fluctuation, broadscale climatic variables could not successfully predict small-scale patterns of change by individual species over time.Nomenclature follows Gould (1975), The grasses of Texas, College Station TX, and Waterfall (1972), Keys to the flora of Oklahoma, Stillwater OK.

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Changes in Herbaceous and Suffrutescent Perennials in Grazed and Ungrazed Desertified Grassland in Southeastern Arizona, 1958-1978

Cited by 68 publications

References 0 publications

How livestock grazing affects vegetation structures and small mammal distribution in the semi-arid Karoo

How livestock grazing affects vegetation structures and small mammal distribution in the semi-arid Karoo

Ordination of vegetation change in Guadalupe Mountains, New Mexico, USA

Succession and fluctuation in Artemisia dominated grassland

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