黄平升　唐小诚　廖克波　杨紫龙　李婷

摘要[目的]调查广西南宁巨尾桉（DH32-28）植苗林各调查因子间的关系。[方法]对在广西南宁树木园新塘和横县林区内生长正常的巨尾桉（DH32-28）植苗林进行调查，分别测定每株树的胸径、树高、年龄等树木调查因子，并对其相关性进行分析，建立胸径与造林时间、树高与造林时间、胸径与树高等因子之间的一系列数学模型，并进行模型的实用性和精度检验。[结果]胸径、树高与造林时间的对数函数关系比较密切，树高与胸径的二次函数模型关系比较密切。胸径与造林时间的关系可以用对数函数模型y=-3.310+4.132 lnx来反映，树高与造林时间的关系可以用对数函数模型y=-15.881+8.816lnx来反映，胸径与树高的关系可以用二次函数模型y=0.635+0.822x+0.042x2来反映。[结论]模型揭示了广西南宁巨尾桉（DH32-28）植苗林各调查因子之间的生长规律性，同时还可以用于桉树人工林林分生长预估中单株树木潜在的生长分析，对桉树人工林的可持续经营利用和森林生态系统恢复具有一定的指导意义。

关键词 巨尾桉（DH32-28）；人工林；调查因子；关系模型；南宁

中图分类号 S792.39 文献标识码 A 文章编号 0517-6611（2016）05-185-04

Abstract [Objective]To investigate the relationship between survey factors of Eucalyptus （DH3228） forest planting in Nanning City of Guangxi Zhuang Autonomous Region.[Method]In Xintang and Hengxian Forest Regions of Nanning Arboretum， normal Eucalyptus （DH3228） forest planting was investigated. Survey factors were detected， such as diameter at breast height ， plant height and plant age. By fully considering the interaction between survey factors， correlation analysis was carried out. A series of mathematical model were carried out， including diameter at breast height and afforestation time， plant height and afforestation time， diameter at breast height and plant height. Practicability and accuracy test of model were detected.[Result]The logarithmic function relationships among diameter at breast height， plant height and afforestation time were relatively close， as well as the quadratic function model relation between plant height and diameter at breast height. Relationship between diameter at breast height and afforestation time could be reflected by logarithmic function model y= -3.310 + 4.132lnx； relationship between plant height and afforestation time could be reflected by logarithmic function model y= -15.881 + 8.816 lnx； relationship between diameter at breast height and plant height could be reflected by quadratic function model y=0.635 + 0.822x+ 0.042x2.[Conclusion]The model reveals the growth regularity among survey factors of Eucalyptus （DH3228） forest planting in Nanning City， can be used as the potential growth analysis of single plant in stand growth forecast of survey factors of Eucalyptus plantations， and has certain guiding significance for the sustainable management and ecosystem restoration of Eucalyptus plantations.

Key words Eucalyptus （DH3228）； Plantation； Survey factors； Relation model； Nanning

桉树（Eucalyptus）是桃金娘科（Mgrtaceae）桉属（Eucalyptus）植物的统称，天然分布于澳大利亚及华莱士线以东岛屿，种类包括变种和亚种有近1 000种之多，是世界四大速生树种之一。因其具有速生、丰产、用途广、适用性强、经济效益高等特点而成为重要的人工用材造林树种之一，在世界各地广泛种植。20世纪中后期，随着林纸一体化和林板一体化的发展，在热带和亚热带地区，桉树人工林得到了迅速的发展[1]。……