Browsing Journal of Range Management, Volume 34, Number 4 (July 1984) by Issue Date
Now showing items 21-23 of 23
Effects of Cattle Grazing on Mountain Meadows in IdahoVegetation changes which occurred during 12 years of protection from grazing were documented in mountain meadows of north-central Idaho. Plant composition changes were evident on all five sites studied, whereas herbage production was significantly less on the grazed than ungrazed areas at two of the sites. Season-long grazing by cattle has apparently been responsible for decreasing production and retarding plant succession. A change in grazing systems would likely increase the carrying capacity for herbivores.
Effects of Fall Clipping or Burning on the Distribution of Chemical Constituents in Bluebunch Wheatgrass in SpringWe examined the effects of fall clipping or burning on chemical constituents and their distribution in bluebunch wheatgrass the following spring. The study was made in both a big sagebrush-bluebunch wheatgrass and a Douglas fir-bluebunch wheatgrass community. The concentration of mineral constituents (nitrogen, phosphorus, calcium and magnesium) was lower while the concentration of fibrous constituents (acid detergent fiber, neutral detergent fiber and lignin) was higher in leafy material at the top of the plant. In the big sagebrush community, the differences among treatments were generally greater in the lower segments of plants. Generally, the mineral constituents increased while the fibrous constituents decreased from the control to the clipped to the burned treatment. The treatment effect was more variable in plants from the Douglas fir community.
Effects of a Wet-Dry Seed Treatment on the Germination and Root Elongation of "Whitmar" Beardless Wheatgrass under Various Water PotentialsSeeds of Whitmar beardless wheatgrass (Agropyron spicatum f. inerme Beetle) were allowed to imbibe water at 20 degrees C for 24 hours, followed by air-drying at room temperature for 24 hours. Seeds were then placed in slanted-plate containers held at 20° C to measure germination and root elongation under water potentials of -0.3, -7.5, and -15 bars. Seed treatment significantly accelerated germination and root elongation under a water potential of -0.3 bars, with some acceleration occurring at -7.5 bars. Treatment did not accelerate growth activity under a water potential of -15 bars.