Abstract: The spawning time, egg bag attachment, spawning site, and oviposition site habitat of the Siberian salamander (Salamandrella keyserlingii) and the Northeastern China salamander (Hynobius leechii) in Changbai Mountain were measured from April to May 2018. The results showed that there were overlaps in the spawning time and the spawning sites between the two sympatric species, with the altitude being an important factor driving their separation or coexistence. Aquatic vegetation was the dominant attachment of egg bags in Salamandrella keyserlingii, accounting for 66.15% of the total, while dead branches were the dominant attachment of egg bags in Hynobius leechii, accounting for 71.60%. There was no significant difference in the spawning sites, but with significant differences in the microhabitat of oviposition sites such as depth of oviposition, water temperature and coverage ratio of sundries. Oviposition sites of Salamandrella keyserlingiiwere shallower, higher in water temperature and coverage ratio of sundries than that of Hynobius leechii. It is concluded that the habitat separation of the spawning sites is the main reason for the coexistence of the two sympatric species.

Key words: spatial autocorrelation, spatial variation., ecosystem, carbon density, Pinus massoniana forest