Autotoxicity of Picea schrenkiana Litter Aqueous Extracts on Seed Germination and Seedling Growth

The study about effects of the different concentration aqueous extracts from the litter of Picea schrenkiana on its seed germination and seedling growth was experimented in the climatic cabinet on the condition that photoperiod was 20 degrees Centigrade,16 hours and dark cycle was 15 degrees Centigrade,8 hours.The results indicated that the aqueous extracts from the litter of Picea schrenkiana had autotoxicity on its seed germination and seedling growth.Germination inability and germination index were significantly inhibited(P0.01),and the inhibition rate was 14.5% and 29.3% respectively when the concentration of aqueous was 0.025 gDW mL~(-1).Germination ratio,the growth of shoot length and rootlength were markedly inhibited(P0.01)when the concentration of aqueous was 0.1 gDW mL~(-1),and the inhibition rate was 21.2%,34.1% and 51.3% respectively.Seed germination was significantly delayed when the concentration of aqueous was 0.1 gDW mL~(-1).The increasing of seedling wet weight was evidently inhibited when the concentration of aqueous was 0.2 gDW mL~(-1),moreover the inhibition rate reached 31.4%.But the increasing of seedling dry weight did not be affected under the same concentration.At the same time,the results also showed that germination ratio was accelerated as using lower concentration aqueous extracts(≤0.05 gDW mL~(-1)).