濒危植物驼峰藤的扦插繁殖及野外回归

Vincetoxicum hainanense is a national level Ⅱ rare and endangered plant in China. It has important ecological value. In this study, we selected three main factors, cutting slips, cutting medium and growth hormone that affect the seedling rate of V. hainanense, each factor included 3 levels, the optimum cutting propagation conditions were obtained by orthogonal test consisting of 3 factors and 3 levels. Results showed that: The seedling rate was highest by taking level 3 branches as cutting slips and bamboo grove soil with humus as cutting medium and 0.5 g/L NAA as growth hormone. With regular watering, adventitious roots emerged 7~10 d later and cuttings became seedling 12~15 d later, the seedling rate reached 87.0% after 1 month. We transplanted these seedlings in three natural distribution areas to do a reintroduction test. These areas are primeval forest of V. hainanense, secondary forest of Cinnamomum burmanni and secondary forest of Syzygium jambos. The results showed that reintroduction plants grew very well in primeval forest of V. hainanense, the average survival rate was 96.7%. After 6 month, the height of plant reached 252.0 cm, base diameter of plant reached 0.78 cm and branch number of the main stem was 3.7, after 9 month, reintroduction plants would blossom and set fruit, the flowering rate and fruit setting rate was 45.5% and 32.7%, it is a feasible method of reintroduction.45.5% and the seed setting rate 32.7%. Together, it can be concluded that it is a feasible method of ecological restoration.