浙江天童常绿木本植物的叶片相对电导率及抗寒性

Leaf frost sensitivity and percentage of electrolyte leakage of the evergreen woody species in Tiantong region,Zhejiang Province

以浙江天童常绿阔叶林59种常见木本植物为研究对象,通过比较其叶片在低温胁迫下的相对电导率差异,揭示该地区常绿阔叶林常见常绿植物的抗寒性,旨在为营建具有较强抗雨雪冰冻灾害能力的人工林提供参考.结果显示:(1)各植物叶片对0℃低温普遍具有较好的抗性,未产生显著伤害;在-5℃低温处理下相对电导率显著增大,均造成了不同程度的伤害;(2)研究区域内樟科与壳斗科植物对-5℃低温耐受性最好,其次为山茶科植物;(3)常绿阔叶树种抗寒性强于针叶树种.建议在该地区营建抗雨雪冰冻人工林时,应优先选择具有较强耐寒性的樟科与壳斗科植物.

In this study,leaf percentage of electrolyte leakage was examined by using respectively 26 ℃,0 ℃ and-5 ℃ temperate treatments,to reflect the leaf frost sensitivity for 59 evergreen woody plants in Tiantong region,Zhejiang province.The objective was to select frost-resistant woody plants for establishing frost-tolerant plantations.The results showed：（1） the most evergreen woody plants acclimatized themselves to 0 ℃,indicating few leaf damage;whereas,-5 ℃ treatment led to a significant increase of leaf percentage of electrolyte leakage for all plants,suggesting a heavy leaf damage;（2） among three dominant families of plants,the frost-resistance was higher in Lauraceae and Fagaceae than in Symplocaceae;and（3） evergreen broadleaf plants was more frost-resistant than conifer species.Therefore,the frost-resistant plants belonging to Lauraceae and Fagaceae families should be preference species in afforestation.