Fig 1.
Study sites on the Daba Mountains, southwestern China.
The study plots represent the natural distribution range of T. sutchuenensis.
Fig 2.
Floristic similarity dendrogram and forest characteristics (A).
Relative basal area (%) distribution of species (height ≥ 1.3 m) (B). The evergreen broad-leaved species include the subtropical evergreen broad-leaved species and the evergreen sclerophyllous species of Quercus.
Fig 3.
Schematic diagram of the composite representation of distribution patterns of T. sutchuenensis.
The Thuja-Tsuga-Quercus community on the crest ridge (a) and (b). The red circled area is shown in (a)-Thuja sutchuenensis. A T. sutchuenensis on the cliff (c). The Thuja-Quercus-Cyclobalanopsis community on the steep slope (d) and (e). QUSP: Quercus spinosa; QUEN: Quercus engleriana.
Fig 4.
The height-class frequency distribution in different topographic habitats.
Bars in the height-class of 0–1.3 m indicate the seedlings/samplings of T. sutchuenensis.
Table 1.
Floristic composition for woody species (relative basal area [RBA] ≥ 0.5% in at least one plant community).
Fig 5.
DBH-class frequency distribution for five major species in various topographic habitats.
Empty bars indicate the seedlings/saplings.
Fig 6.
The age structure of the T. sutchuenensis population in different topographical habitats.
Data include individuals ≥ 1.3 m in height and established seedlings/saplings (15 cm< H < 1.3 m).
Fig 7.
A sapling of T. sutchuenensis in a crevice on the cliff (a).
A seedling of T. sutchuenensis in a crevice on the cliff (b). The deformed structure of T. sutchuenensis on the cliffs (c) and (d). A root of T. sutchuenensis over rocks (e). T. sutchuenensis resprouting after cutting (f).
Table 2.
Number of seedlings/saplings (15 cm < height < 1.3 m) of Thuja sutchuenensis in various micro-sites.
Table 3.
General characteristics of Thuja sutchuenensis as compared with the other four species of Thuja.