Abstract: In this paper, the relationships between tree species distribution and environmental gradient in eastern Zhongtiao Mountain were studied by TWINSPAN and CCA ordination, and the species group division was made according to the relative positions of the tree species on the ordination diagram and referring to the dendrological documents. The results indicated that altitude was the most important environmental factor affecting the distribution pattern of tree species, while soil fertility and soil moisture index TRMI also played important roles. The 72 tree species (varieties) in the mountain were divided into 6 species groups, i.e., low altitude + warm and moist, low-mid altitude + warm and dry, low-mid altitude+ lukewarm and humid, mid altitude + moist + fertile soil, mid-high altitude +cool and dry + infertile soil, and high altitude + cold and humid-moist. Based on the greater similarities in the ecological features and distribution characteristics of the tree species in each group, the habitat characters of each species group were introduced in brief. The TWINSPAN results tallied well with the species group division.

Key words: Eringonidium graminicola Sundevall, Adonia variegata Goeze, Nabis sinoferus Hsiao, Predation function, Helicoverpa armigera Hubner