Chapter 22: The Bronze Tree and The Classic Of Mountains And Seas
The ancient people's worship of the sacred tree could be learned from the "Classic of Mountains and Seas" (1). In several chapters of the book, there were records of the trees of life such as Ruomu and Fusang (2), but the only record of a bronze tree that could be found was in Sanxingdui (3).
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TN Notes:
(1) Remember, The Classic of Mountains and Seas, also known as Shan Hai Jing, is a Chinese classic text and a compilation of mythic geography and beasts. Wiki link
(2) The Classics of Mountains and Seas has the places where the sacred trees were, or they could even be the names of them. There is information about Fusang here.
(3) Sanxingdui, or Three Star Mound, is an archaeological site and major Bronze Age culture located in modern Guanghan, Sichuan, China. They actually did find a bronze tree. Here is more info about it.