5.香椿（左圖）的右邊樹冠葉片全失．到現場觀察樹腳位置，可以找到有部分根部外露泥面，證實樹的根部出現移位，部分樹根折斷，做成樹冠向後壞死crown die back的現象．6.福氏臭椿(右圖)現在應該是果期階段，樹上找不到果實，這棵樹是雄性的呢．
The whole right side of the crown of Chinese Mahogany
(left) lost all its leaves. When you look at its foot on
site, you can find some of the roots are exposed. It』s
confirmed that its roots are shifted and some roots are
broken. All these lead to crown dieback. 6.
At the time of shooting, Ailanthus (right) should be in its
fruiting stage. However, no fruits could be found. It』s
simply because it』s a male.
The issues of 1-6
are not difficult to see. If you spend some time to think,
make bold hypothesis and check carefully, some clues can
surely be found.
1,3 are general observations
which just need a little more attention.
2,6 require knowledge of
4 is derived from the
similarities of the two trees to speculate the owner』s
purpose of planting trees.
5 is knowledge in
arboriculture; from crown dieback and then find the proof of
Two simple trees can lead to six
interesting observations. If you pass by Yau Ma Tei MTR
station, you can take A2 exit and go to The Cityview to have
a look and test your observation.