Browsing Journal of Range Management, Volume 25, Number 6 (November 1973) by Title
Now showing items 19-21 of 21
Vegetation Changes between 1943 and 1965 on the Shortgrass Plains of WyomingGround cover estimates on permanently marked plots in East Central Wyoming were compared between 1943 and 1965. On grazed native range plots, shortgrasses increased and midgrasses decreased when comparing 1965 to 1943. Plots in exclosures showed a decrease in shortgrass cover and an increase in cover of midgrasses. Generally, big sagebrush (Artemisia tridentata) and plains pricklypear (Opuntia polyacantha) increased markedly on both open and exclosure plots. Due to excessive grazing pressure, the total perennial grass cover on a section of abandoned farmland was nearly 35% less in 1965 than in 1943.
Water Harvesting Efficiencies of Four Soil Surface TreatmentsWater harvesting efficiency of four soil surface treatments was studied for 5 years at Gillette, Wyoming, and the Central Plains Experimental Range near Nunn, Colorado. The surface treatments consisted of rangeland, salt (NaCl), plastic covered with pea gravel, and asphalt roll roofing. Average water harvesting efficiencies ranged from 5% on rangeland at Gillette to 105% from the asphalt roll roofing treatment at the Central Plains Experimental Range. Spring and fall snowstorms resulted in water harvesting efficiencies of over 100% at the Central Plains Experimental Range. Precipitation was highest in April, May, and June and lowest in August.
Wax-treated Soils for Harvesting WaterShortage of water for livestock often limits the carrying capacity of rangeland. Water harvesting can provide extra water. Paraffin wax was applied as granules or flakes on the surface of two experimental watershed plots and allowed to melt and spread in the hot desert sun to form a hydrophobic soil surface, which then readily shed water. The wax-treated plots yielded an average of 90% precipitation runoff, compared to only 30% runoff from two untreated plots and to 100% runoff from a butyl-covered plot.