The forest can withstand light for less than 25 years under a tree crown. Natural renewal is good in side-lighted shades, with more natural regeneration of larvae in small areas of fire and in the open forest, but less so under dense forest canopy. Climate requirements are low, spread over annual averages of 4-12°c, annual precipitation of 400-900 mm, and annual relative humidity of more than 60% high mountains or high latitudes. Sichuan and xinjiang forest areas accumulate more than 1,000 cubic metres per hectare and tibetan forest areas more than 2,000 cubic metres. There are many shallow roots of tree species, the main roots are not visible, the sides are well developed, and more than three quarters of the roots are concentrated in the surface. ... After intenseness, wind falls are prone. The solid age is typically 30 to 40 years, 60 to 120 years, and every four to five years it appears to be a seed year. Sichuan forest trees produce an average of about 40 kg per hectare, and in general 9 to october, the fruit of the moon matures, with seeds spreading at a distance of about 2 to 3 times the height of the parent tree。
There are approximately 40 types of clouds in the world, spread over the northern hemisphere. China has about 20 species, spread over the north-east, north-west, north-west and south-west and taiwan. Three groups can be divided according to foliage and aerobics, i. E. Clouds and aerobics, i. E. Guillotines, lijiang and fish sprouts. The leaves of the lumbers are cut across all sides. The luminous sprouts are twigs, twirling or flat, and each of them has more than one-fold of the gasholes below, and the non-gas glazes below, including lijiang, zhuang, zhiguang, zhuang, zhuang zhuang, zhuang zhuang zhuang, zhuang zhuang zhuang, have no gas lines below, including two zhuong zhifu, zhuong zhuong zhu, and zhuong zhu zhu zhu。