濒危植物金毛狗不同居群间多样性分化的研究

测定了来自7个居群的金毛狗59个个体的根状茎、叶、孢子囊群、孢子囊群盖及孢子等43项形态指标,采用方差分析、欧氏距离聚类分析、相似系数聚类分析等方法,研究了各项形态指标在居群间的差异显著性、形态多样性及其反映出的居群间的近缘关系。结果表明：①在各项形态指标中差异显著的占23．26％,差异极显著的占27．91％,差异不显著的占48．83％,②营养器官的形态特征变异大,繁殖器官孢子的形态特征差异不显著,相对稳定;③居群间在居群水平上未袁现明显的形态分化的同时在个体水平以及不同地理种源上呈现出一定的分化。     

一种带压缩因子的自适应权重粒子群算法

结合对粒子群优化算法收敛性的分析,针对算法在寻优过程中容易出现的早熟现象,提出了一种带压缩因子的自适应权重粒子群算法.该算法以目标函数值的改变为信息,动态设置惯性权重值,使算法达到全局寻优和局部探索之间的有效平衡.仿真实验表明该算法能有效抑制寻优过程中的早熟现象.     

天然四倍体柑橘与二倍体5SrDNA荧光原位杂交分析

为探讨柑橘天然四倍体来源,以5SrDNA作为探针,运用荧光原位杂交技术比较柑橘属3个生物型的天然四倍体及其相应的二倍体的5SrDNA位点.结果表明,红江橙二倍体和化州橙二倍体的5SrDNA位点为2个,其天然四倍体均有4个位点;资阳香橙二倍体有1个5SrDNA位点,其天然四倍体有2个位点.供试天然四倍体柑橘的5SrDNA位点数目为二倍体的加倍,而在染色体上的位置与相应二倍体处于相同序号染色体的相同位置,只是信号亮度存在差异.5SrDNA位点数目和倍性有密切联系,随着倍性的增加有成倍增加的趋势,推测这些天然四倍体基因组的形成极有可能由二倍体直接加倍而来.     

周期FC群的几种Frattini性质

研究了周期FC群的Frattini性质,证明了局部p-幂零性、局部p-可解性和局部p-超可解性是周期FC群类的Frattini性质.     

基于RS和GIS的地震移民选址空间决策研究与实现

基于遥感技术宏观数据快速获取能力以及地理信息系统提供的强大空间分析能力,建立了地震移民选址的空间分析模型,对研究区的数据进行迁建适宜度分区处理,并在此基础上进行了候选区模糊综合评判.并以汶川绵虒镇为研究区,对地质安全、地形地貌、水系分布、自然人文保护、交通运输、城镇建设、发展潜力等7个一级指标,以及活断层、地质灾害、土地覆盖、生态环境保护、旅游资源等15个二级指标进行了分析处理,选址结果合理,能够为地震移民选址的科学决策提供辅助数据.     

飞机播种建立混播草场技术的研究

本文分析了不同地类与飞播成效的内在关系,提出了选择播区的标准。应用模糊聚类分析方法,划分出飞播草场类型,并提出了适宜的草种组合及播量。试验采用棋盘式和重复式作业法,显著地提高了均匀度及成效。混播草场的建成,从根本上改变了飞播形成的单一的沙打旺草场景观,取得了显著的效益。     

川西高原多时相干涉雷达土地覆盖分类研究

获取了川西高原区多时相Sentinel-1星载合成孔径雷达(SAR)影像,引入了地形辐射校正技术,发展了一种阴影双视向补偿算法,综合分析后向散射系数、纹理特征、相干系数、数字高程的统计特征,采用支持向量机进行了土地覆盖分类.结果表明,对地形起伏大的高原山区,该方法能够有效提取常绿针叶林、混交林、灌木林、天然草地、水体等地物信息,分类总精度为83.62%.     

The Economic Rationality and Institutional Driving Force of Edible Agro-products Enterprises Adopting ISO9000 Standards

This paper analyzed the economic rationality and institutional driving force of edible agro-products enterprises adopting ISO9000 standards,and built the theoretical analysis framework of enterprises adopting ISO9000 standards.The results indicated that the enterprises adopted ISO9000 standards form a variety of promoting product quality and safety business strategy options based on the considerations that getting economic efficiency and the access to resources.Based on the results,some recommendations were given for stimulating enterprises to adopt ISO9000 standards.     

Molecular Identification and Cultivar Fingerprints of Prunus persica (L.) Batsch Germplasms

[Objective] The aim was to study the molecular identification and cultivar fingerprints of Prunus persica (L.) Batsch germplasms.[Method] Sixty peach genotypes,representing China common local cultivars and European samples were screened by microsatellites (simple sequence repeats,SSRs) and Inter-Simple Sequence Repeat (ISSR) markers.[Result] 26 reproducible bands were amplified by Nine SSR primers,and 24 of which were polymorphic; 236 bands were amplified by 30 ISSR primers,and 113 of which were polymorphic.31 genotypes were discriminated with 1-3 distinct polymorphic bands generated from the primers ISSR and SSR.Seven cultivar-specific ISSR fragments and two SSR unique alleles obtained from this study were available to be converted into Sequence Characterized Amplified Region (SCAR) markers.The genetic similarity coefficient (GS) estimated from these molecular data averaged were 0.939 (ranged from 0.856 to 0.983) for ISSR and 0.646 (ranged from 0.240 to 1.000) for SSR,respectively.The combined grouping association indicated that most local Chinese peach cultivars and exotic accessions were clustered together.This could be related to the mode of introduction and maintenance of the peach cultivars involving limited foundation germplasm,exchange of cultivars between plantations,and periodic development of new recombinant cultivars following sexual reproduction.[Conclusion] The results obtained in this work would help to improve the conservation,molecular identification and management of peach germplasm in breeding.     

峨眉千里光甲醇提取物杀虫、抑菌及抑制种子萌发活性的初步研究

本文研究了峨眉千里光甲醇提取物的杀虫、抑菌及抑制种子萌发的活性。结果表明,对甲醇提取物进一步萃取后,氯仿、乙酸乙酯及正丁醇萃取物表现出很强的杀虫、抑菌及抑制种子萌发活性,其中对桃蚜24h的LC50值在0.119~0.414mg/mL之间,对番茄灰霉病菌72h的EC50值在5.956~9.416mg/mL之间。因此,峨眉千里光甲醇提取物的氯仿和乙酸乙酯萃取物的杀虫、抑菌活性成分值得进一步深入研究。