How many trees are there in China?

Kai Cheng, Haitao Yang, Yuling Chen, Zekun Yang, Yu Ren, Yixuan Zhang, Danyang Lin, Weiyan Liu, Guoran Huang, Jiachen Xu, Mengxi Chen, Zhiyong Qi, Guangcai Xu, Shengli Tao, Hongcan Guan, Qin Ma, Huawei Wan, Tianyu Hu, Yanjun Su, Zhiheng Wang, Keping Ma, Qinghua Guo