General situation of Mount Tai (Tianmenling) at the source of Tianmenling;

Due to the high altitude, there are low mountain shrubs, evergreen broad-leaved forests, evergreen deciduous broad-leaved mixed forests and coniferous broad-leaved mixed forests. The ancient Liriodendron chinense in relict plant, which is listed as a national key protected tree species, is still scattered around Tianmenling at an altitude of 1000 meters. Ginkgo biloba, which originated in Paleozoic, appeared in China only after the Quaternary Glacier Period. It is called "living fossil" and distributed in Xiashan of Heyuan. From 1958 to 1960, the main forest areas such as Dalian Iron and Steel Company and Heyuan were seriously damaged, the growth of trees declined, and the stock decreased obviously.

Evergreen broad-leaved forest is mainly distributed in the part below 600 meters above sea level. There are also a few distributed in low mountains and hills. The dominant species is Quercus. And myrtle. , including Cyclobalanopsis glauca, Ardisia angustifolia, Ardisia japonica, Castanea henryi, Schima superba, Populus davidiana and Liquidambar formosana. Secondly, Pinus massoniana is mixed among them. Associated tree species include Schima superba and Phyllostachys pubescens. Shrubs mainly include rhododendron, Toona sinensis, black rice, Toona sinensis and so on.

Evergreen coniferous forests are mainly distributed in low hills below 300 meters above sea level. The constructive species are natural Pinus massoniana and artificial Chinese fir. The main tree species are oak, alsophila spinulosa, rhododendron and black rice. There are some secondary evergreen broad-leaved forests behind the houses next to the village.

Chinese fir forests are mainly distributed in low mountains and high hills, with an altitude below 600 meters, and there are few low hills and hills. In addition to the artificial pure Chinese fir forest, the community is also mixed with Pinus massoniana, Phyllostachys pubescens and broad-leaved trees. Chinese fir, a group of tree species, is mainly associated with Pinus massoniana, Bitter, Sweet, Sweet, Liquidambar formosana and Castanea henryi. Shrubs include linden, rhododendron and mangosteen.

Phyllostachys pubescens forests are distributed in the hilly landform below 900 meters above sea level, such as Shankeng, Xiashan, Jiazheng and Donggang Mountain in Heyuan Town, with small areas scattered in front of and behind the village. The constructive species is Phyllostachys pubescens, which often forms mixed forests with Chinese fir, Pinus massoniana and broad-leaved trees, and there are few pure forests. Associated tree species are bitter, sweet, Schima superba, Liquidambar formosana, Castanea henryi, Quercus variabilis and so on. Shrubs include gardenia, rhododendron, mangosteen, Toona sinensis, sumac, black rice and so on.

The low mountain shrubs are mainly distributed in the low mountain landform above 900 meters above sea level, at the junction of Huangtongxiang and Heyuan towns with Zixi and Guixi counties. Li Mao, Litsea cubeba, Toona sinensis and Mangosteen are the tree species in this community caused by fire, strong wind and freezing. Poultry:

Magpie, eagle, pheasant, turtledove, warbler (also known as oriole), sparrow, cuckoo (also known as Zigui), crow, thrush, cuckoo, woodpecker, bamboo chicken, cormorant, wild duck, egret (that is, egret) and wren. Mammals:

Tigers, leopards, roe deer, muntjac, water deer, rabbits, goats, porcupines, foxes, rats, rats (commonly known as weasels), oxtail raccoons, bats, wild boars, etc.

fish

There are carp, bighead carp, silver carp, mandarin fish (commonly known as mandarin fish), mullet (commonly known as snake fish), crucian carp, eel, loach, catfish (with a big mouth, a bluish yellow back and a lot of saliva), eel and so on.