Seed emergence and growth of Hedysarum scoparium under an constant temperature regime(20±1℃;light/dark,12/12h) following sand burial 0,1,2,3,4 and 5cm was studied.The results showed that the seedlings emergence,days to first emergence, numbers of leaf,heights of seedling,length of root and biomass allocation of studied species were significantly affected by depths of sand burial(P<0.001).The highest percentage of seedling emergence(95.6%) occurred in sand burial for 2cm,and the lowest(43.4%) occurs for 5cm;the maximum height of seedlings(11.6cm),absolute height of seedlings(13.9cm) and the maximum ground biomass (26.7mg) occurred in the sand burial for 2cm;and the shortest seedlings(3.3cm),the shortest root(4.3cm),and minimum ground biomass(5.3mg) occurred for 5cm;The experiment indicates that the sand burial depth for 2cm is the optimum for seedling emergence and growth in H.scoparium.
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