不同种源北美鹅掌楸实生苗在山东区域内抗寒适应性评价

EVALUATION OF THE COLD RESISTANT OF SEED SEEDLINGS OF LIRIODENDRON TULIPIFERA INTRODUCED FROM DIFFERENT PROVENCES IN SHANDONG AREA

观测结果表明,在正常的天气条件下,繁育栽培的三批北美鹅掌楸实生苗生长二、三年后冻害级别多为0-1级,且多为细小侧枝存在抽梢现象,苗木保存率达到98%;严寒条件下,北美鹅掌楸苗木保存率可达80%以上。所引三批北美鹅掌楸各种源种子繁育的苗木,在山东区域内基本适应,并均具有较强的抗性,且以俄亥俄州种源的北美鹅掌楸实生苗抗寒性最强。

Survey results of seed seedlings of L.tulipifera intriduced and planted in 2003,2004,and 2006 show that under the normal weather condition.The seed secdlings of L.tulipifera could survive over the winter in the open ground.The seedlings of L.tulipifera growed 2 of 3 year later,the cold injury rank are 0-1 levels,only tiny lateral branches showed cold injuries,the nursery stock survival rate is 98%.Under the severely cold condition,the nursery stock survival rate may reach up to 80%.The results show that all the seed seedlings of L.tulieifera have strong cold resistance which can grow in Shandong area adaptively and the performent of Ohio provence is the best.