. Effects of different systems and intensities of grazing upon the native vegetation at the Northern Great Plains Field Station. Grazing; Forage plants; Agricultural systems. 22 BULLETIN 1170, U. S. DEPARTMENT OF AGRICULTURE. grama grass and the bunches of needle grass. The larger mats and bunches have broken up since 1916. The dry seasons have no doubt been of greater influence as a direct cause of this than has the graz- ing in the case of blue grama. Western needle grass has been greatly reduced in extent in the quadrat in the 30-acre pasture. This has no doubt been largely because of the i
. Effects of different systems and intensities of grazing upon the native vegetation at the Northern Great Plains Field Station. Grazing; Forage plants; Agricultural systems. 22 BULLETIN 1170, U. S. DEPARTMENT OF AGRICULTURE. grama grass and the bunches of needle grass. The larger mats and bunches have broken up since 1916. The dry seasons have no doubt been of greater influence as a direct cause of this than has the graz- ing in the case of blue grama. Western needle grass has been greatly reduced in extent in the quadrat in the 30-acre pasture. This has no doubt been largely because of the intense grazing, since the reduc- tion is twice as much as in the quadrat in the 100-acre pasture. This fact is further confirmed by observation and by the clipped quadrats. Western needle grass does not withstand severe grazing as well as. Fig. 8.—Square-meter quadrat in the 30-acre pasture, showing the relationship of Bou- teloua and Stipa. Charted near the close of the grazing season in 1916. Bouteloua gracilis is indicated by B and Stipa comata by S. blue grama. It is a shorter lived perennial and is more dependent upon reseeding. Western needle grass is the species that is bene- fited most by the system of deferred and rotation grazing. € ISOLATION TRANSECTS. Areas that are now known as " isolation transects"18 were set aside in the 100-acre and the 30-acre pastures in 1915. A similar area 18 Dr. H. L. Shantz suggested these areas when he visited the station in 1915. Their designation as isolation transect? was suggested by Dr. F. E. Clements when he visited the station in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sarvis, J. T. (Johnson Thatcher), 1886-; North Dakota Agricultural College; United States. Bureau of Plant Industry. Washington, D. C. : U. S. Dept. of Agriculture
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