Effects of defoliatingStipa tenuisandPiptochaetium napostaenseat different phenological stages: tiller demography and growth

Becker, G. F.; Busso, Carlos; Montani, Tomás; Orchansky, Alberto L.; Brevedan, R. E.; Burgos, María; Flemmer, Andrea

doi:10.1006/jare.1995.0131

Cited by 24 publications

(12 citation statements)

References 65 publications

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“…These results are similar to those obtained for other perennial grasses which were defoliated at different phenological stages or remained nondefoliated (Becker et al, 1997b). However, successive defoliations during late phenological stages of plants for at least two years reduced plant biomass of Agropyron species under different levels of soil water availability (Busso & Richards, 1995).…”

Section: Resultssupporting

confidence: 90%

“…Similar results have Defoliation Effects on Grass Biomass 145 been obtained for other perennial grass species under various levels of soil water availability where plant biomass was reduced by the cumulative effects of successive, once-a-year defoliations (Busso & Richards, 1995;Becker et al, 1997b). This response has been attributed to a reduction of photosynthetic leaf surface area and reduced numbers and size of replacement tillers (Busso & Richards, 1995;Becker et al, 1997b). In a parallel study, Flemmer et al (2002) report that the numbers of axillary buds originating daughter tillers on parent tillers of S. clarazii were 32% lower at the beginning of 1997 than at the initiation of the study in 1995.…”

Section: Resultssupporting

confidence: 73%

“…This occurred despite rainfed and water-stressed plots receiving more rainfall in 1996 than in 1995 (Figures 1 and 2). Similar results have Defoliation Effects on Grass Biomass 145 been obtained for other perennial grass species under various levels of soil water availability where plant biomass was reduced by the cumulative effects of successive, once-a-year defoliations (Busso & Richards, 1995;Becker et al, 1997b). This response has been attributed to a reduction of photosynthetic leaf surface area and reduced numbers and size of replacement tillers (Busso & Richards, 1995;Becker et al, 1997b).…”

Section: Resultssupporting

confidence: 71%

“…However, the intensity, frequency, and timing of the defoliation event can influence biomass production (Briske & Richards, 1995). Perennial grasses defoliated during early developmental stages can have a similar or greater biomass compared to nondefoliated plants, but defoliation in late developmental stages generally affects plant biomass negatively (Becker et al, 1997b). Additionally, plant biomass responses to defoliation are influenced by the composition of defoliated and nondefoliated neighbors (Saint Pierre et al, 2000).…”

Section: Effects Of Defoliation At Varying Soil Water Regimes On Abovmentioning

confidence: 96%

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Effects of Defoliation at Varying Soil Water Regimes on Aboveground Biomass of Perennial Grasses

Flemmer

Busso

Fernández

et al. 2003

Arid Land Research and Management

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 73%

Section: Resultssupporting

confidence: 71%

Section: Effects Of Defoliation At Varying Soil Water Regimes On Abovmentioning

confidence: 96%

See 2 more Smart Citations

Effects of Defoliation at Varying Soil Water Regimes on Aboveground Biomass of Perennial Grasses

Flemmer

Busso

Fernández

et al. 2003

Arid Land Research and Management

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“…This most likely contributed to a similar (P > 0.89) total dry weight production in both defoliation treatments at the end of the study period. Becker et al (1997) also obtained a similar dry weight production on plants of S. tenuis that remained undefoliated or that were defoliated at different stages of internode elongation under natural conditions. The results from this study agree with those observed by Flemmer (2000) when S. clarazii and S. tenuis were either defoliated or not at different phenological stages in competition with undefoliated plants of S. gynerioides under rainfed conditions.…”

Section: When Plants Grew Without Nearby Neighbours S Claraziimentioning

confidence: 57%

Direct assessment of competitive ability and defoliation tolerance in perennial grasses

Pierre¹,

Busso²,

Montenegro³

et al. 2004

Can. J. Plant Sci.

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. 2004. Direct assessment of competitive ability and defoliation tolerance in perennial grasses. Can. J. Plant . Stipa clarazii is a dominant, late-seral perennial grass species under exclosure or lightly grazed rangelands in semiarid Argentina, whereas S. tenuis and S. ambigua are earlier-seral perennial tussock grasses. Recent studies have demonstrated that late-seral species are more competitive and can have either similar or greater herbivory tolerance than earlier-seral species. We hyphothesized that (1) tolerance to defoliation is greater on defoliated plants of S. clarazii than on those of S. tenuis and S. ambigua, (2) competitive ability is greater in S. clarazii than in S. tenuis and S. ambigua when plants remain undefoliated or are exposed to a comparable defoliation intensity, and (3) competitive ability decreases in S. clarazii when this species is selectively defoliated within a non-defoliated, nearby neighbourhood of S. tenuis or S. ambigua. The study objectives included obtaining a direct measure of competitive ability and defoliation tolerance in the three perennial grasses when they grew either in isolation or in different neighbourhoods and were exposed to various defoliation patterns in the field. In 1998, two parallel studies were conducted within a 2-yr-old field exclosure during one growing season. In one study, responses were evaluated on either defoliated or undefoliated plants of all three species without neighbours. In a second experiment, four types of neighborhoods were selected such that a central (target) plant of one species was surrounded by five neighboring plants of a different species. Three different defoliation patterns were imposed on each neighbourhood type. Results led to acceptance of the first and second and rejection of the third hypothesis. When plants grew without nearby neighbours, greater growth rates for height, dry matter production and end-of-season daughter tiller production per parent tiller in S. clarazii relative to S. tenuis and S. ambigua contributed to greater regrowth in S. clarazii. Amounts of 15 N atom excess were always greater in S. clarazii than in S. tenuis and S. ambigua independently of neighbourhood type and pattern of defoliation. However, uptake of 15 N was similar in S. clarazii to that in S. tenuis or S. ambigua when S. clarazii was selectively defoliated within a non-defoliated, nearby neighbourhood of any of the other two species. Selective herbivory of S. clarazii, rather than factors associated with its competitive ability and defoliation tolerance, were found to be the major determinant driving its replacement by earlier-seral, less desirable perennial grasses in rangelands of central Argentina. [195][196][197][198][199][200][201][202][203][204]. Stipa clarazii est une graminée de transition vivace tardive mais dominante dans les exclos ou les grands parcours peu fréquentés des régions semi-arides de l'Argentine, où les vivaces de transition S. tenuis et S. ambigua peuplent plus hâtivement les buttes de tourbe. Des études récentes indiq...

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Effects of defoliatingStipa tenuisandPiptochaetium napostaenseat different phenological stages: axillary bud viability and growth

Becker

Busso

Montani

1997

Journal of Arid Environments

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Effects of defoliatingStipa tenuisandPiptochaetium napostaenseat different phenological stages: tiller demography and growth

Cited by 24 publications

References 65 publications

Effects of Defoliation at Varying Soil Water Regimes on Aboveground Biomass of Perennial Grasses

Effects of Defoliation at Varying Soil Water Regimes on Aboveground Biomass of Perennial Grasses

Direct assessment of competitive ability and defoliation tolerance in perennial grasses

Effects of defoliatingStipa tenuisandPiptochaetium napostaenseat different phenological stages: axillary bud viability and growth

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