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乳源木莲（Manglietia yuyuanensisLaw）属木兰科（Magnolinaceae）木莲属（Manglietia Blume）常绿大乔木，是近年来发掘推出的优良乡土速生用材和生态造林树种，自然分布于广东北部、湖南南部、江西南部、安徽南部、浙江和福建等地，生于海拔700～1200m的阔叶林中，其生长迅速，

Genetic diversity and genetic differentiation of 11 Manglietia yuyuanensis provenances from main distribution area were analyzed using ISSR molecular markers.A total of 108 amplified loci were detected by 9 primers,of which the proportion of polymorphic loci was 86.11%.A high degree of genetic diversity in M.yuyuanensis was detected,and the genetic diversity index in species level was 0.282 7,which was markedly higher than that of M.decidua and M.patungensis,the rare and endangered species belonging to the same genus with M.yuyuanensis.The result showed that there was significant difference in genetic diversity among provenances.Provenances from north and north-west Fujian province and the nearby area,including Shaxian,Jian'ou,Wuyishan of Fujian and Longquan of Zhejiang,had higher genetic diversity,which were the dominant regions to be protected and utilized. Small population effect brought by habitat fragmentation and distance isolation effect resulted in high genetic differentiation among provenances,which