The plane tree is half dead: a metaphor for losing a spouse. Do you remember the peacock flying southeast? They and the trees buried underground are phoenix trees.
Hongyan's cry of sorrow: sorrow. Metaphor displaced victims live a miserable life.
Cuckoo cries blood. Legend has it that cuckoos wail day and night until blood flows out. Often used to describe extreme sadness.
Apes cry and cranes mourn.