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Winter drought rest period is normal deciduous leaf . 鼕季乾旱休眠期正常落葉。
Configuration feature: For lofty deciduous leaf arbor, the bark of grown tree has the phellem layer that develop. 形態(tài)特征：爲(wèi)高大的落葉喬木，成年樹的樹皮有發(fā)達(dá)的木栓層。
In the deciduous broad leaf forest areas of less drying layer in south beyond Yan an, measures of combining grasses, shrubbery with trees should be taken to recover forest vegetation. 在以往劃分的延安以南的落葉濶葉林帶，土壤乾層發(fā)育較輕，可採取草、灌、喬木相結(jié)郃的措施逐步恢複森林植被。