钩栗不同种源间苗期切根处理比较试验

以金秀、龙胜、资源、贺州、乐业5个不同地理种源的钩栗种子为试材,在开展移苗阶段后,研究了不同切根长度和生根剂含量组合的处理方式对钩栗育苗的影响。结果表明:不同种源和处理方式钩栗苗木保存率差异明显,5种处理方式中,贺州种源的地径年生长量均比其它4个种源的地径年生长量大,资源种源的苗高年生长量均比其它4个种源苗高年生长量大。因此,贺州钩栗种源种质可能优于其它4个种源。

大模数齿轮虚拟制造的齿形设计

齿轮的齿形从渐开线形成原理可分为:z≤41,41>z≤130,z>130等三部分齿形。z≤41齿形设计比较复杂,小齿数的齿轮铣削加工又有根切。在虚拟设计齿形时,需预先、并行、敏捷、综合地考虑加工方法,齿形曲线光滑连接,齿轮的根切,齿轮强度和齿轮寿命等对齿轮工作性能的影响。虚拟制造的齿形设计的建模,优化,仿真等核心技术可优化协调这些影响,虚拟齿形设计是设计齿轮加工软件的前提和基础。

Comparison Experiment of Root Cutting to Castanopsis tibetana Hance between Different Provenances at Seedling Stage

Castanopsis tibetana of five different provenances （Jinxiu, Longsheng, Ziyuan, Hezhou and Leye） were selected as experimental materials to investigate the effects of treatments combining different root lengths and contents of rooting agent on the growth of C. tibetana after transplanting of seedlings. The results showed that, there were significant differences in the preserving rate of C. tibetana seedlings between different provenances and different treatments. Among the 5 treatments, the seedlings of Hezhou provenance showed the maximum annual increment of ground diameter, and the seedlings of Ziyuan provenance exhibited the maximum annual increment of seedling height. Therefore, the germplasm from Hezhou provenance might be better than those from other provenances.

白肋烟烟碱含量的机械调控技术

研究了打顶后 5d机械切根 1/ 8、1/ 4对白肋烟烟碱合成、烟叶产量和产值的影响 ,结果表明 :机械切根能明显降低烟碱含量 ,其中切根 1/ 8与对照相比 ,上部叶烟碱下降 1.9个百分点 ,降幅31.33% ;中部叶烟碱下降 2 .13个百分点 ,降幅 5 1.4 5 %。切根处理对烟叶产值。