From what aspects does Song of Trees introduce these trees?

Song of Trees introduces these trees from four aspects: shape, color, happiness and flowers.

About the author:

Zhou Yunan, the author of Song of Trees, was born in Lintong, Shaanxi, 1940 in July. Graduated from Chinese Department of Shaanxi Normal University. Professor, Northwest A&F University. He has been engaged in the teaching and research of garden history and forestry history for a long time, and founded the Forestry History Research Office of Xilin College. He has published papers such as On Forest Agriculture-Also on the Origin of Agriculture, A Brief History of Ancient Tree Planting in Shaanxi, Historical Changes and Resistance of Qinling Forest, etc.

Included plants:

The songs of trees mainly include Hundred Trees, Top Fruit Trees, Northeast Pearl Plum, Tung Tree, Tokyo Cherry Blossom, Northeast Eupatorium, Winter Red, Winter Bo, Winter Cherry Blossom, Dong Brown, Bean Pear, Rhododendron, Rhododendron, Du Ying, Eucommia ulmoides, Tilia amurensis, Emei Michelia, Liriodendron and Liriodendron.