铅笔柏当年实生苗嫩枝扦插试验

用铅笔柏当年实生苗嫩枝作插穗,经4种激素处理,插在5种基质上,封闭管理和封闭、全光不同管理育苗.试验结果表明,该材料作插穗,愈合生根能力强,发根早,成活率高,基质和激素间无明显差异,全光喷雾优于全封闭管理,平均成活率为87%,最高达100%.     

高速钻削复合材料的切削力

采用多种硬质合金钻头,在高转速和不同进给速度条件下对碳纤维/环氧树脂复合材料进行孔加工正交试验,通过研究其轴向力和扭矩以分析刀具条件和切削参数的适应性.结果表明:主轴转速是影响轴向力和扭矩的最主要因素,高转速钻削时轴向力和扭矩都显著减小;减小进给速度也使轴向力和扭矩减小,但其影响小于主轴转速.此外,钻头材质对轴向力和扭矩的影响大于钻头几何形状和进给速度;进给速度对轴向力的影响较大,而钻头几何形状对扭矩的影响较大.     

Contribution of White Clover Varieties in High-Productivity Systems under Grazing and Cutting

Two medium leaf size varieties of white clover (Trifolium repens L.) were grown in mixture with a range of grass species and varieties in a field experiment conducted over 4 years. The clovers were grown singly or as a blend in swards with a tetraploid perennial ryegrass (Lolium perenne L.), a diploid Italian ryegrass (Lolium multiflorum L.) or tetraploid hybrids between these two species (Lolium x boucheanum Kunth). These grasses were also grown in monoculture. Swards were managed in a regime involving two periods of sheep grazing, two periods of cattle grazing and a silage cut in the same year for 4 years. The objectives of this experiment were 3‐fold: (1) to examine the yield and persistency of white clover in highly productive systems with modern perennial, hybrid and Italian ryegrasses; (2) to compare the performance of white clover varieties grown singly in mixture with grasses with their performance together as a blend, and (3) to examine the persistency of new Italian ryegrass varieties, exemplified by AberComo. The clover content of the sward remained high throughout the experiment, with a mean of 31 % overall. Differences in clover yield between plots were largely attributable to the effects of companion grasses. Total yields were very similar in plots containing different clover varieties and in plots where these varieties had been grown singly or as a blend. Grass yields in mixture were greater than those in monoculture but showed similar relative rankings. The diploid Italian ryegrass variety AberComo showed an unexpectedly high yield in the 4th year of the experiment. The implications of these results for strategies for productive, sustainable agriculture using modern white clover and ryegrass varieties are discussed.     

影响烟草切茎繁殖的几个因素分析

带叶切割５～６茎节烟苗茎节置２８℃沙床保湿培养，６～１０ｄ茎上生出不定根，同时腋芽开始生长。１株烟苗经２次无性繁殖可扩增到２５～３５株。该无性系在株高、单株叶数、抗病性等方面均比亲本实生苗整齐     

填筑路堤的路堑开挖土石料性能分类研究

提出了以石块为主的用作路堤填料的路堑开挖土石料按岩性进行分类的依据和标准，讨论了用它们填筑路基的施工工艺，质量控制要点及质量指标检测方法。     

国有林场天然林择伐采运技术探讨

本文针对福建省国有林场天然林资源现状，提出采用择伐方式的必要性，并对择伐作业中采伐木的选择、采伐强度和郁闭度的控制进行了论述，对充分利用天然林资源、保护幼苗幼树、保证伐区作业质量的择伐采运技术进行探讨。     

构建实例库的参数模型及其应用

通过分析系统模型和IDEFO模型,提出了实例参数模型,即将切削系统的各组成参量分成4类:非控制参量,过程参量,控制参量和输出参量并以此提出了实例库的构建过程.最后根据提出的参数模型,建立了高速切削数据库系统.     

一类矩形切割的优化模型

研究了工业中常遇到的先将原料板切割成加工拼板后，再将拼板切割成单元板的一类矩形板材切割问题，此类问题归结为二维排布的双层优化，针对单元板在拼板上和拼板在原料板上的4种不同排布情形，建立了统一的非线性整数规划模型，根据问题的特点，给出了该模型的一个化双层优化为单层优化的求解算法，实际应用中，该算法能在数秒钟内按工艺要求给出最优切割方案，与传统方法相比，料板利用率常可提高5％～10％．     

地菍的育苗与园林应用技术研究

以经组织培养后移栽于大田的地苍无性系苗茎段为试材，对地苍的育苗与园林应用技术进行初步研究，结果表明：大规模扦插育苗时选择使用50mg／L浓度的ATP生根粉处理穗条，较为经济有效；容器育苗时选择“80％田土＋10％细河沙＋10％东北泥炭土”作为栽培基质，其容器苗生长较好，满盆率较高；地苍作为边坡绿化材料时宜应用于光照条件良好的缓坡；作为花坛营造材料时不宜散铺，满铺或模拟自然群落铺种效果较好，以模拟自然群落铺种效果最好；作为盆栽材料时单株盆栽的成活率、成苗率和满盆率、缀花数等均明显小于3株盆栽的。     

天然林林木空间格局的随机性检验和调整

通过对帽儿山林场101块固定标准地的林木空间分布格局的检验发现,对天然林而言空间格局以随机格局和均匀格局为主。集聚格局一般是由林窗引起的,而有林窗不一定都是集聚格局,但择伐过程中如果人为扩大林窗则会使随机格局变为集聚格局。在择伐设计中适当保留林窗周围的林木,一般能避免对原有空间格局的改变。