Autofertility and Bee Visitation in Winter and Spring Genotypes of Faba Beans (Vicia faba L.)

Differences in the expression of autofertility and in the evidence of attractiveness to bees were investigated in both autumn-sown and spring-sown faba beans. All six winter stocks and one spring stock expressed very little autofertility, with averages of only 10% of flowers and 7% of ovules fertilized when undisturbed. Three other spring stocks, including a closed-flower population, were moderately autofertile, with 22% of flowers and 17% of ovules fertilized when undisturbed. The remaining two spring stocks, both English cultivars, expressed good autofertility, with 50% of undisturbed flowers and 44% of ovules fertilized. Current levels of autofertility in the winter and closed-flower stocks were inadequate to allow the development of a desirable distribution of pods without substantial bee visitation. If levels of autofertility could be raised simply by selection within populations, then they should have been much higher in these stocks. Therefore, autofertile parents will probably have to be included in programmes for breeding cultivars with improved levels of auto fertility. The closed-flower population received significantly less bee visitation than the other stocks in the spring trial. No variation in attractiveness to bees was found among the open-flowered spring stocks, nor among the winter stocks.     

桑树砧木耐盐性比较

将不同地区采集的6种桑树砧木进行盐（NaCl）胁迫处理,根据不同桑种实生苗的相对生长量、盐害指数的统计分析,对桑树砧木耐盐性比较、评价.结果表明,桑树砧木耐盐性由高到低分别是安徽的华桑、新疆的白桑、河北的鲁桑、安徽的鲁桑、江苏的山桑、广东的广东桑.     

库存管理系统分类与选择的研究

根据各种库存管理系统的特点、持有量及所占资金额度对库存进行分类、分析,并提出了针对企业内不同存货类型选择相适应的库存管理系统的观点,对充分整合企业现有资源、加强库存管理有着十分重要的意义。     

温度和降水变化对太行山森林蓄积增长的影响

利用太行山区 77个气象台站和 72 1个人工林标准地的调查数据 ,借助回归分析方法 ,对温度、降水变化对森林生长的影响进行了探讨。结果表明 ,在太行山区 ,温度与纬度、海拔之间相关显著 ,温度与森林蓄积量显著相关 ;对于平均林龄为 2 3a左右的人工林 ,在西北坡 ,温度升高、降水变化 ,对森林蓄积量无显著影响 ;但在河北省即太行山东南坡 ,温度每升高 1℃ ,森林蓄积量下降 6 88～ 8 12m3 hm2 ,降水每增加 10 0mm ,森林蓄积量增加 2 1 1m3 hm2 。     

转基因741杨高效配套育苗体系建立

针对转基因741杨硬枝扦插难生根的特性，将组织培养及多种扦插繁殖技术有机结合在一起，建立了转基因741杨综合配套育苗体系，提出了适合无性繁殖的“遮阴间歇喷雾扦插”和“移棚不移苗扦插繁殖”育苗方法。转基因741杨组培快繁中，初始启动培养基为MS 6-BA1．0mg／L NAA0．1ms／L，嫩茎增殖培养基为MS 6-BA0．3～1．0mg／L IBA0～0．3mg／L，茎尖生根培养基为1／2MS 0．3IBA 1．5％蔗糖。不同月份嫩枝扦插培养的苗木中，5月份扦插的嫩枝生长较快，但苗木间分化程度较高；8月份扦插的嫩枝生长相对较慢，但苗木的分化程度低，生长整齐。不同月份苗木移栽后，生长节律相同，经过1a生长，不同月份间苗木生长差异不明显，5月份扦插的苗木生长略优于其他月份扦插的苗木。     

Effects of leaf area and auxin on rooting and growth of rooted stem cuttings of neem

Green stem cuttings, obtained from 2-year old managed stockplants, with 30, 50 or 100% leaf area were rooted in a non-mist propagator following treatment with 0, 0.2, 0.4 or 0.8% IBA solution. The rooted cuttings were transferred to polythene pots and grown in a nursery for 12 weeks. Rooting percentages of IBA treated cuttings did not significantly differ from those of control cuttings. Likewise leaf area did not significantly influence the percentage of cuttings that rooted. The effects of leaf area and/or IBA treatment in the propagation unit were manifested on the growth of rooted cuttings in polythene pots. Number of roots increased with the increase in IBA concentration and this response was enhanced by increasing leaf area. Root biomass increased with the increase in leaf area even in the control cuttings. Root development was highly influenced by the leaf area and IBA, and hence the growth of rooted cuttings. Cuttings treated with 0.2 or 0.4% IBA at 100% leaf area yielded the best performing rooted cuttings.     

关于货位可移动式货架立体仓库的探讨

在现有自动化立体仓库设备的基础上提出了一种新型的以货位可移动式货架为核心的自动化仓库作业方案,阐述了该模式下实现货物自动入库、出库的工作原理以及相关的拣货方法和机械设备的选择.并通过与几种不同设备的比较得出该方案的优势,为现代物流自动化仓库的发展提出了新的思想理念.     

利用地径建立林木材积估测模型的探讨

通过实测铁杉、红桦和湖北花楸的地径、胸径、树高和材积，我们建立了根据林木地径估测树木材积的数学模型，具有较高的相关系数，可以应用于森林资源管理和森林生态系统研究。     

对森工企业实行债转股的认识

债转股是政府摆脱国有企业和银行双重困境的政策选择。但在目前经济和社会信用背景条件下，对国有森工企业实行债转股的作用不能高估，必须对债转股的理论依据和实践中可能遇到的问题进行深入分析。单纯寄厚望于债转股，是不能解决根本问题的。     

绿化工程主材“甲供”与“乙供”苗木模式的比较研究

主材供应方式是园林工程中受重视的环节。以恒大公司的几个园林工程为例,通过比较绿化工程苗木材料的"甲供"和"乙供"模式的利弊,归纳总结出适合不同要求的采购模式的方法,从而帮助业主更高效准确地作出选择,并使其选择的材料在达到预期绿化效果的同时,又能适当控制成本。