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Rangeland Ecology and Management





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10.2111 / REM-D-11-00133.1


Grazing at high stocking rates May Increase sediment and nutrient loading of streams pasture Through Transport in precipitation runoff and bank erosion. A 3-yr (2007-2009) grazing study was Conducted on 13 cool-season grass pastures to quantify effects of stocking rate and botanical composition on forage sward height, proportions of bare and manure-covered ground, and bank erosion adjacent to streams. Pastures ranged from 2 ha to 107 ha with stream Reaches of 306 m to 1778 m That has drained watersheds of 253 to 5660 ha. Bare and manure-covered ground Were Measured at 15.2-m distance perpendicular to the stream at 30.5-m intervals at up to 30 locations on each side of the stream by the line transect method in May, July, September, and November of each year.At the midpoint of the 15.2-m line, forage sward height was Measured with a falling plate meter (4.8 kg · m -2 ) and plant species identified. In November 2006, fiberglass pins (1.6 × 76.2 cm) 73.7 cm Were driven into the stream bank at 1-m intervals from the streambed to the top of the bank along 10 transect equidistant locations on each side of the stream bank erosion to measure During spring, summer, and fall of each year. Increasing pasture stocking rates Increased manure-covered ground and Decreased sward height, but did not Affect proportions of bare ground. The greatest, intermediate, and Least net soil erosion rates occurred During the winter / early spring, late spring / early summer, and late summer / fall seasons. Stocking rates Between measurements, Expressed as cow-days · m -1 stream, Were not related to bank erosion. Increasing stocking rates per unit of stream length will cover manure Increase and decrease forage sward height, but not Affect proportions of bare ground or bank erosion rates pasture adjacent to streams.THEREFORE, managing stocking rates May reduce nutrient loading of streams pasture.


This article is from Rangeland Ecology & Management 65 (2012): 119, doi:10.2111/REM-D-11-00133.1.


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