Effect of Different Improved Measures on Saline-alkalied Grassland

The ratio of leguminosae and compositae forage in the grass biocenose increased 19.8%～39.9% and 27.5%～34.4% than those in control area,respectively,of gramineae forage decreased 15.3%～21.3% than that in control area and the yield of eatable forage increased 22.0%～57.8% by means of fertilizing improvement.The one of leguminosac and compositae forage increased 13.4%～26.7% and 4.7%～9.0%,respectively,the yield of eatable forage increased 13.1%～26.3% by means of closed fencing.The one of leguminosae and compositae forage increased 17.7%～27.3% and 23.2%～36.3% respectively,of gramineal forage decreased 10.1%～12.1%,the yield of eatable forage increased-28.5%～28.6% by means of shallow ploughing.Those indicated that fertilizing and closed fencing were a effectire way of grassland improve ment.