How Time and Intensity of Clipping Affect Tall Bluebell

“…By artificially flattening the stems of tall bluebell (Mertensia arizonica var. leonardi) during the early flowering and fruiting stages for 4 consecutive years, Laycock and Conrad (1969) found that herbage production was reduced by approximately 50%. Similar studies for other species are needed to clarify the effect of trampling upon herbage production and vigor.…”

Section: Trampling Lossesmentioning

confidence: 96%

Three Methods of Determining Diet, Utilization, and Trampling Damage on Sheep Ranges

Laycock¹,

Buchanan²,

Krueger³

1972

Journal of Range Management

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“…Consequently, highly palatable, late -seral forb species can be eliminated from plant communities with little or no change in range condition scores and recommended stocking rates. Published studies of defoliation effects on vigor and/or population dynamics of forb species are uncommon (Julander 1968;Laycock and Conrad 1969;Inouye 1982;Reichman and Smith 1991;Gronemeyer et al 1997) and rare for forbs in grass-dominated ecosystems (Hartnett 1990;Vermeire and Gillen 2000;Damhoureyeh and Hartnett 2002;Hickman and Hartnett 2002).…”

Section: Introductionmentioning

confidence: 99%

Stiff Sunflower Population Dynamics on Summer-grazed Sandhills Rangeland

Reece¹,

Schacht²,

Koehler³

2004

Rangeland Ecology & Management

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Thousands of forb species are distributed among the diverse rangelands of North America. However, little is known about livestock grazing effects on the demographics and potential demise of palatable forbs in grassland ecosystems. A study was designed to quantify the cumulative effects of summer grazing on the demographics of stiff sunflower (Helianthus rigidus [Cass.] Desf. spp. subrhomboides [Rydb.] Heiser), a highly palatable, late seral, perennial forb. Pastures were grazed for 5-7 days in mid-June or mid-July during 1995-1997 at 16, 32, or 48 animal unit days (AUD) per hectare. All grazing treatments reduced the plant height of stiff sunflower. However, population densities were maintained throughout the study at light stocking rates (16 AUDha-1). In contrast, a single year of heavy stocking (48 AUDha-1) in June reduced spring stiff sunflower densities 55 %. Densities declined about 30% after 1 year at moderate stocking rates (32 AUDha-1) in either month or heavy stocking in July. After 3 years of short-duration grazing in June, moderate and heavy stocking rates eliminated some colonies and reduced mean pasture densities by about 90% compared with 40% and 70% reductions in moderately and heavily stocked July grazed pastures, respectively. Reductions in spring densities corresponded to increases in premature senescence the previous year when more than 30% of the plants turned brown before mid August. Critical levels of premature senescence were likely to occur when more than 60% of stiff sunflower plants within colonies were grazed. Light stocking rates are rare on privately owned Nebraska Sandhills rangeland (4.7 million ha); therefore, vigorous populations of stiff sunflower are most likely to occur in pastures used predominantly during the dormant season. Resumen Miles de especies de forraje están distribuidas entre el diverso campo de Norteamérica. Sin embargo, poco se sabe acerca del efecto del pastoreo ganadero en la demografía y posible fallecimiento de forraje aceptable en ecosistemas de pradera. Este estudio fue designado para cuantificar los efectos cumulativos del pastoreo en el verano en la demografía del girasol (Helianthus rigidus [Cass.] Desf. spp. subrhomboides [Rydb.] Heiser), una sumamente aceptable, tardía planta perenne. Las praderas fueron pastoreadas por 5-7 días en la mitad de junio o mitad de julio durante 1995-1997 en 16, 32, o 48 unidades de días con animales (AUD) por hectárea Todos los tratamientos de pastoreo redujeron la estatura del girasol. Sin embargo, la densidad de la populación se mantuvo en un índice de abastecimiento liviano (16 AUDha-1). En contraste, un solo año de abastecimiento pesado (48 AUDha-1) en junio redujo la densidad del girasol en la primavera a 55 %. La densidad desminuyo como 30% despues del 1 año en un índice de abastecimiento moderado (32 AUDha-1) en cualquier mes o abasteciemiento pesado en julio. Despues de 3 años de pastoreo a corto plazo en junio, el índice de abastecimiento moderado y pesado eliminaron algunas de las colonias y redujeron el promedio ...

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How Time and Intensity of Clipping Affect Tall Bluebell

Cited by 9 publications

References 0 publications

Alkaloid Content of Duncecap Larkspur after Two Years of Clipping

Alkaloid Content of Duncecap Larkspur after Two Years of Clipping

Three Methods of Determining Diet, Utilization, and Trampling Damage on Sheep Ranges

Stiff Sunflower Population Dynamics on Summer-grazed Sandhills Rangeland

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