The study on dry farming technology of the plant density for Hedisarumu scoparium on the desert pasture of Hexi Corridor

200 hectares of transplanted Hedysarum scoparium were established with various density (2 m2 m, 2 m3 m, 3 m3 m and 3 m4 m) in the desert pasture of Gaotai County in Gansu during the year of 2004. The plots were set for 4years continuous observation of the change conditions on survival rate, ramification number, height, canopy size and biomass. The result showed that 3 m3 m and 3 m4 m were the best density and under these densities, H. scoparium grew vigorously, ramified densely and developed good roots, plant species between the clumps of H. scoparium increased, and the coverage enlarged with an obvious sandfixation effect. The density greater than 3 m3 m and 3 m4 m resulted in H. scoparium dwarfed and developed slowly; the original species between the clumps of H. scoparium disappeared with a poor sandfixation effect.