Abstract: Laboratory experiments were conducted to examine the effects of ducks' digestion on the germination of seeds of bulrush(Scirpus mariqueter). The seeds were processed with acidic environment(pH=2), high temperature(42℃)and rubbing to simulate the environment in the alimentary tract of ducks. Results showed that the grind increased the germination rate of seeds significantly, while the acidic environment and high temperature reduced the germination rate of seeds. The ducks' ingestion had no significant effect on the germination of seeds, but was beneficial to the spread of seeds.

Key words: Soil respiration, Microorganism respiration, Root respiration, Affecting factors