伊犁绢蒿在放牧干扰下再生性的变化

伊犁绢蒿荒漠草地既是新疆天山北坡重要的春秋牧场,又是新疆草地退化最严重的一类草地.通过在乌鲁木齐市东山区设置的轻度放牧(LG)、中度放牧(MG)、重度放牧(HG)和极度放牧(EG)四个水平模拟放牧的测定,对伊犁绢蒿的再生高度、再生速度、再生密度的变化进行了研究.研究结果表明:4月15日～5月15日,中度放牧(MG)下伊犁绢蒿再生速度最快;5月1日和5月15日,中度放牧(MG)伊犁绢蒿再生草的高度最高;中度放牧(MG)有利于增加伊犁绢蒿的再生密度.因此,中度放牧(MG)有利于伊犁绢蒿的再生.

Change of Regeneration of Seriphidium transiliense under the Disturbance of Grazing

The Seriphidium transiliense desert was not only the important springautumn pasture in the north slope of Tianshan mountain,Xinjiang,but also the most serious degenerate pasture of Xinjiang.Through simulated grazing of light grazing(LG),middle grazing(MG),high grazing(HG)and extreme grazing(EG),regeneration height,regeneration speed,regeneration density of Seriphidium transiliense were determined in Dongshan district of Urumqi city in 2006.The results showed that regeneration speed of Seriphidium transiliense in middle grazing(MG)is fastest between April 15～May 15;regeneration high of Seriphidium transiliense in middle grazing(MG)is highest on May 1 and May 15;middle grazing(MG)is advantageous to increase regenerated density in Seriphidium transiliense. Therefore,middle grazing(MG)is advantageous for regeneration of Seriphidium transiliense.