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对黄柏树连续三年的环状剥皮试验表明,一年生黄柏树皮药效成分不变,年产量是15年生老皮的44～63%。采用此法,扩大药源。
A circular peeling test on Huang Baishu for three consecutive years showed that the annual effective composition of Phellodendron bark was unchanged, and the annual yield was 44-63% of 15-year old skin. Use this method to expand the source of medicine.