【摘要】 为了探讨截干香樟与全冠香樟栽植后的不同生长情况和相应价值,本试验通过对胸径8cm全冠香樟与胸径25cm截干香樟栽植若干年后的胸径、冠幅和叶面积作比较分析,结果表明,胸径25cm截干香樟栽植费用是使用胸径8cm全冠香樟建设成本的13倍。胸径25cm香樟截干后栽植十年内,其价值大大缩水,所具有的价值仅为8cm全冠香樟的33.3%左右;在栽植15年后,所具有的价值仅为8cm全冠香樟的50%左右;在栽植后20年,所具有的价值也只是8cm全冠香樟的75%左右。因此,考虑经济、生态和建设等综合因素,城市绿化可以灵活采用小胸径全冠香樟和大胸径截干香樟。本研究依据数学方法建立香樟树木生长模型,客观反映全冠香樟和截干香樟栽植后的生长动态,并比较两者价值,研究结论对城市绿地建设具有参考作用。更多还原

【Abstract】 In order to understand the post-planting growth condition and corresponding economic value of truncated camphor trees and crown ones a comparison was made between crown camphor trees of an 8cm diameter at breast height(DBH) and truncated ones of 25 cm DBH in diameter,crown width and leaf area(all the trees above had been planted for years). Result showed that the planting cost of the truncated camphor trees of 25 cm DBH was 13 times as much as that of the crown ones of 8cm DBH was; the economic value of the camphor trees of 25 cm DBH shrank dramatically in a decade after being planted truncately so that their value was just one third of the crown ones of 8 cm DBH; in 15 years their value was just half that of the crown ones; and in 20 years their value was only about three fourth of that of the crown ones. Given such factors as economy,ecology,construction,and so on,a flexible way should be taken to choose crown camphor trees of small DBH or truncated ones of large DBH in urban landscaping. Mathematical methods were taken to construct the growth model of camphor trees. Such a model was able to reflect the post-planting growth dynamics and economic value of truncated camphor trees and crown ones objectively and thus provide reference for urban green building.更多还原