Fig. 4

First derivative visible–near infrared spectra of bamboo timber fraction. Data of one spectrum were collected from 2-year-old mature bamboo and those of another spectrum were collected from one-month-old juvenile bamboo
First derivative visible–near infrared spectra of bamboo timber fraction. Data of one spectrum were collected from 2-year-old mature bamboo and those of another spectrum were collected from one-month-old juvenile bamboo