Why did Cixi cut down the ginkgo tree in Guangxu's father's cemetery?

Cixi chose Zai Tian, the four-year-old son of the Seven Emperors, as the successor, but she heard that the Feng Shui of the Seven Tombs was particularly good. There is a century-old ginkgo tree, and there is a white on the king's head, which is the emperor. It doesn't matter, ginkgo trees can't stay. So Cixi sent people to cut down trees overnight. As for the bleeding of the fruit tree, later generations concluded that it was because the tree was old for a long time and empty, and there were two big snakes living in it. The snake was cut down, causing blood to gush.