Effects of fencing closure on grassland reservation in the Zhaosu pasture of Xinjiang

A series of survey relative to the vegetation characteristics of fenced natural grassland were carried out in the farm 76 located in the Zhaosu Pasture of Xinjiang during two years from 2004 to 2005,tending to reveal the effects of fencing closure on grassland reservation.The results showed that the grass canopy height,total cover degree and fresh herbage yield under fencing closure treatment during the two years from 2003 to 2004 increased by average of 36.5 %,12.5 % and 56.2 % respectively more than the control;and the three indexes during the years from 2003 to 2005 increased by average of 138.5 %,54.3 % and 109.1 % respectively more than control;in addition,soil moisture and ammonia nitrogen content of soil layer from 0 to 5 cm depth increased by 63.6 %,26.7 % respectively,and soil moisture of soil layer from 10 cm to 20 cm depth increased by 85.1 %.That proved grassland reservation by fencing closure had brought about significant effectiveness.