淳安县古树资源调查与分析

Investigation and Analysis of Ancient Tree Resources in Chun′an County

在对淳安县古树资源进行实地调查的基础上,对当地古树资源总量、树种、生长因子、分布格局等特征进行了分析。结果表明:淳安县共有古树4744株,其中散生古树2260株,群状古树2484株;按保护级别分,一级古树294株,二级古树946株,三级古树3504株;古树隶属于39科65属96种,树种起源古老残遗成分多,地理成分多样,分布型以热带和温带为主,中国特有成分少,珍稀古树有10种459株;古树树高10~25 m区段共3865株(占81.47%),胸围100~399 cm区段共3979株(占83.87%),平均冠幅5.00~14.99 m区段共3255株(占68.61%);树龄100~299年区段共3504株(占73.86%),树龄1000年以上的古树15株;古树水平分布以淳安县西南部和西部数量较多,乡镇分布以汾口镇古树最多;垂直分布海拔区域100~199 m古树最多,共2107株(占44.41%)。

Based on field investigation of ancient tree resources in Chun′an County,this paper analyzed the characteristics of ancient tree resources in the locality,such as total resources,ancient tree species,growth factors and distribution pattern.The results showed that there were 4744 ancient trees in Chun′an County,among them,there were 2260 scattered ancient trees and 2484 clustered ancient trees.According to protection class,there were 294 first-class ancient trees,946 second-class ancient trees and 3504 third-class ancient trees.The ancient trees belonged to 39 families,65 genera and 96 species.There were many ancient remnants of origin,geographical elements were diverse,and the distribution patterns were mainly tropical and temperate.There were few unique ingredients in China,and there were 459 rare ancient trees belonging to 10 species.There were 3865 ancient trees(81.47%)in the height range of 10-25 m,a total of 3979 ancient trees(83.87%)in the chest circumference range of 100-399 cm,a total of 3255 ancient trees(68.61%)with an average crown width of 5.00-14.99 m.There were 3504 ancient trees in the age range from 100 to 299,accounting for 73.86%,and there were 15 ancient trees over 1000 years old.The horizontal distribution of ancient trees was the largest in the southwest and west of Chun'an County,Fenkou Town had the most ancient trees.There were 2107 ancient trees with vertical distribution of 100-199 m above sea level,accounting for 44.41%.