龙泉市野生榧树资源分布与生长状况分析

Resource Distribution and Growth of Wild Torreya grandis in Longquan City

根据调查数据分析龙泉市野生分布的榧树资源及其生长状况,采用方差分析对不同海拔、坡向、土壤的野生榧树生长状况进行差异性分析。结果表明:龙泉市野生榧树共有203株,全市野生榧树平均树高为18.57 m,平均胸径为81.84 cm,平均冠幅为9.15 m;随着海拔的升高,龙泉市野生榧树的生长状况有下降的趋势;龙泉市野生榧树最适宜生长的坡向由高到低分别为南、北、东南、西南、西、东北、东、西北;生长于红壤的野生榧树胸径和平均冠幅显著大于生长于黄壤的野生榧树;龙泉市野生榧树最适宜生长区域为较低海拔地区南坡向或北坡向的红壤区。

According to the survey data,the Torreya grandis resources and their growth status of wild distribution in Longquan City were analyzed,and the differences of growth status of T.grandis in different altitude,slope direction and soil were analyzed by variance analysis.The results showed that there were 203 wild T.grandis trees in Longquan City,with an average height of 18.57m,an average DBH of 81.84 cm and an average crown diameter of 9.15 m.With the increase of altitude,the growth status of the wild T.grandis trees in Longquan City had a downward trend.The most suitable slope direction for the growth of the wild T.grandis trees in Longquan City was South,North,Southeast,Southwest,West,Northeast,East and Northwest,respectively.The diameter at breast height and the average crown diameter of the wild T.grandis trees growing in the red soil were significantly larger than those growing in the yellow soil;the most suitable growth area of the wild T.grandis trees in Longquan City was the red soil area in the south or north slope of the lower altitude area.