Comparative study on stomatal density and SPAD of Elymus sibiricus in QinghaiTibet Plateau

To inerease yield of Elymus sibiricus grass, metallograph method and SPAD502 plus were used to measure stomatal density and relative content of chlorophyll of three cultioars of the E.sibiricus. The results showed that density of E.sibiricus stomatal gradually changed in growth period, and decreased in fullbloom stage, the change trend of relative chlorophyll content (SPAD) of E.sibiricus was the same to potato stomatal density basically. Through the experimental, it was concluded that stomatal density and the SPAD of Qingmu NO.1 were maximum, and its grass yield was the highest.