Health rating and calibration
Jiankang forest grows well, with developed branches, normal leaf size and color, and can bear fruit and reproduce normally without any disaster.
Sub-healthy trees grow well, with occasional yellowing, fading or abnormal shedding of leaves (the incidence rate is below 10%), and the fruiting and reproduction are affected to some extent, but not or slightly.
Moderately healthy trees grow and develop in general, and their leaves turn yellow, fade or fall off abnormally (the incidence rate is 10% ~ 30%), resulting in inhibition of reproduction or moderate disasters.
The growth and development of unhealthy trees can't reach the normal state, and their leaves are often yellow, faded or fall off abnormally (the incidence rate is over 30%), and their growth is obviously inhibited, so they can't bear fruit and reproduce, or suffer from serious disasters.