Comparison of the Understory Vegetation of Juniperus Woodlands

Wayne, Rob; Auken, O. W. Van

doi:10.1007/978-0-387-34003-6_5

Cited by 9 publications

(7 citation statements)

References 68 publications

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“…Regions in the southwest where C. planostachys is reported are described as having hot and dry summers (Thornthwaite, 1931). Unlike most sedges, C. planostachys occurs in full sun and shaded habitats (Wayne and Van Auken, 2008). Photosynthetic values for C. planostachys were in contrast to those reported for other sedges.…”

Section: Temporal and Spatial Trendsmentioning

confidence: 96%

“…Associated with these woodlands are sparsely vegetated intercanopy patches (Van Auken, 2000). The major herbaceous species below the canopy is C. planostachys (Wayne and Van Auken, 2008), and in the gaps Aristida longiseta (red three-awn), Bouteloua curtipendula (side-oats grama), Bothriochloa (¼Andropogon) laguroides (silver bluestem), Bothriochloa ischaemum (KR bluestem), various other C 4 grasses and a variety of herbaceous annuals are common (Terletzky and Van Auken, 1996).…”

Section: Study Site Characteristicsmentioning

confidence: 99%

“…During periods of prolonged stress, it appears any photosynthate produced or derived from carbon stores is used for cellular maintenance leaving little or none for biomass gain (Berry and Bjö rkman, 1980;Raghavendra, 2000). The higher soil water maintained throughout the year in shaded habitat probably resulted in C. planostachys at the canopy and edge positions having greater annual carbon uptake than those plants in the gap; likely explaining the high biomass distribution of C. planostachys in these microsites (Wayne and Van Auken, 2008).…”

Section: Temporal and Spatial Trendsmentioning

confidence: 99%

“…The developing canopy has a negative influence on grass cover resulting in substantial decreases or total elimination in some cases (McPherson et al, 1988;Fuhlendorf et al, 1997). However, in some Juniperus communities, a drought tolerant sedge (Cyperaceae) appears as an exception in the understory (Wayne, 2007;Wayne and Van Auken, 2008).…”

Section: Introductionmentioning

confidence: 98%

“…Abundance of C. planostachys, and other species (Breshears, 2006), appears related to the light and water gradients that occur along the woodland to grassland continuum, with cover and biomass highest in low light below the canopy, and lowest in the high light of the intercanopy gaps (Wayne and Van Auken, 2008). Cover for C. planostachys varied from 33 AE 3% below the canopy to 47 AE 4.5% at the outside edge and 1 AE 0% in the gap.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Light responses of Carex planostachys from various microsites in a Juniperus community

Wayne

Auken

2009

Journal of Arid Environments

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Section: Temporal and Spatial Trendsmentioning

confidence: 96%

Section: Study Site Characteristicsmentioning

confidence: 99%

Section: Temporal and Spatial Trendsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Light responses of Carex planostachys from various microsites in a Juniperus community

Wayne

Auken

2009

Journal of Arid Environments

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Assessment of the Allelopathic Potential of Juniperus ashei on Germination and Growth of Bouteloua curtipendula

Young

Bush

2009

J Chem Ecol

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Potential allelopathic compounds of Juniperus ashei Buchh. (Ashe juniper) and their effect on a native grass were determined in laboratory and field studies. Solid-phase microextraction and gas chromatography/mass spectrometry were used to determine if monoterpenes found in the essential oils of J. ashei are released in leaf and litter leachate, as well as volatilized from leaf tissue. Camphor, bornyl acetate, and limonene were found in leaf and fresh litter leachates; however, degraded litter did not contain any of these compounds. Camphor was the most common potentially allelopathic compound found in J. ashei leaf and litter leachate and in volatiles from leaf tissue. The effects of leaf and litter tissue on the germination of Bouteloua curtipendula (Michx.) Torr. (side-oats grama) was tested by using the "sandwich agar method". The highest germination of B. curtipendula (29.6%) occurred in the control, which was significantly higher than fresh litter (13.2%) and degraded litter (16.2%). The lowest germination (6.2%) occurred with J. ashei leaves. In the field experiment, aboveground dry mass of B. curtipendula was evaluated in relation to position within the canopy and intercanopy of J. ashei adult trees when light and water were held constant across locations. Aboveground dry mass of B. curtipendula was significantly greater in the intercanopies of J. ashei (163.7 g m(2)) compared to the dry mass in the understory (44.8 g m(2)) and dripline (44.5 g m(2)), suggesting some negative influence by J. ashei. Chemical analyses indicate that monoterpenes are released through leaching and volatilization from J. ashei, and germination and field studies suggest that these compounds inhibit B. curtipendula.

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Causes and consequences of woody plant encroachment into western North American grasslands

Auken

2009

Journal of Environmental Management

527

358

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Comparison of the Understory Vegetation of Juniperus Woodlands

Cited by 9 publications

References 68 publications

Light responses of Carex planostachys from various microsites in a Juniperus community

Light responses of Carex planostachys from various microsites in a Juniperus community

Assessment of the Allelopathic Potential of Juniperus ashei on Germination and Growth of Bouteloua curtipendula

Causes and consequences of woody plant encroachment into western North American grasslands

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