Tw o genetic trails including eight seed sources o f three nativeAescu lus species and tw enty plus tree fam ilies o fA. chinensis var. chekiangensis from Tong lu o f Zhejiang w ere used to exp lore the genetic variation be tw eenand w ith in A esculus spec ies for seed, g row th and morpho logy tra its at seed ling and young stage. The resu lts demonstrated that there w ere significant d ifferences fo r g row th and morpho logy characteristics among eight provenances ofthreeAesculus species. Among threeAesculus species, seeds ofA. w ilsonii were the b igges,t seeds o fA. ch inensisthe m iddle and seeds ofA. chinensis var. chekiangensis the leas.t Seed sources o fA. w ilsonii w ith b igger seedsw eregenera lly from the southern and southw estern areas. Itw as found that the spec ies/provenances from the seed sourcesw ith b ig seeds possessed greater seedling grow th, ex tensive tap and la teral roo t system, and larger leaves. Seedlingtest resu lt o f species/provenance grow th w as no t used to pred icted the grow th performance at young stage, because ofmarked seedmaternal effec.t A. chinensis var. chekiangensis from Lin a'n o fZhe jiangw ith least seeds have best grow thperformance, and w hileA. w ilsonii from M abian of S ichuan w ith b iggest seeds exh ib itedm ediate grow th perform anceat age tw o. Moreover, there ex isted rich fam ily varia tion for g row th andmorpho logy of seed ling and young trees inA.chinensis var. chekiangensis. Seed ling g row th o f fam ilies w as sign ificantly and positive ly related to the ir young treegrow th. Early se lection o f grow th traits cou ld conduct at seedling stage.

针对马褂木不具原生根原基, 穗条扦插不易生根这一特性, 对影响扦插生根的母树年龄、穗条枝龄、扦插基质、扦插季节、生根特点以及插后管理等因子进行了比较系统的试验研究, 提高了扦插成活率。一般扦插生根成活率可达80%, 如采用带顶芽嫩枝穗条扦插高达91. 4%。鉴于嫩枝扦插效果突出, 遂又增设采穗圃研建内容, 以供大批量培育嫩枝扦插苗, 形成了自采穗圃营建、采穗、扦插到插后管理等一套完整而简易高效的杂种马褂木扦插繁殖实用技术。

目的 定量研究杉木林分中不同空间结构对林木冠形生长变化的影响，实现基于空间结构的杉木树冠生长可视化模拟。 方法 以湖南省攸县黄丰桥国有林场为试验区，在林分中选择并划分空间结构单元，进行冠形和空间结构数据调查，将林木东南西北4个方向的活枝下高、冠高、冠幅作为林木冠形描述因子，将周围木影响距离、相对树高定义为水平空间结构参数Ph和垂直空间结构参数Pv，使用多元逐步回归的分析方法，分析冠形描述因子与年龄、水平、垂直空间结构参数的关系，建立不同空间结构下杉木冠形的生长变化模型。基于B样条曲线模拟杉木冠形，构建不同生长阶段的三维杉木模型，结合三维动态渲染技术，实现杉木树冠生长的可视化模拟。 结果 通过对年龄和水平、垂直空间结构参数的逐步回归分析，结果表明：林木活枝下高、冠高和年龄、垂直空间结构参数呈现显著相关关系，模型决定系数R²分别为0.754和0.813；林木各向冠幅和年龄、水平空间结构参数呈现极显著相关关系，模型决定系数R²为0.623。基于杉木树冠生长模型和三维动态渲染技术，实现了树冠在东南西北不同方向的生长可视化。 结论 通过划分空间结构单元的方法选择研究目标并进行数据调查，使用逐步回归的方法，分析杉木冠形数据和年龄与空间结构数据的关系，建立树冠各方向活枝下高、冠高、冠幅的生长模型，结合三维动态渲染技术，使用MOGRE三维渲染引擎作为工具，实现了基于空间结构的杉木树冠生长可视化模拟。