玉米灰斑病的发病程度与品种抗性间的关系

通过对18个玉米品种的抗病性调查可知,不同玉米品种对小斑病和灰斑病存在着一定的抗性差异。对灰斑病中感（MS）品种为郑单958、谷育178和泰玉7号,对灰斑病中抗（MR）品种为天泰14、金海702、金穗18、五岳97—1、泰玉11、浚单20和鲁单6018,其余皆为高抗（HR）品种。     

Stay green trait: variation, inheritance and its association with spot blotch resistance in spring wheat (Triticum aestivum L.)

One thousand four hundred and seven spring wheat germplasm lines belonging to Indian and CIMMYT wheat programs were evaluated for stay green (SG) trait and resistance to spot blotch caused by Bipolaris sorokiniana during three consecutive crop seasons, 1999–2000, 2000–2001 and 2001–2002. Disease severity was recorded at six different growth stages beginning from tillering to late milk stage. SG trait was measured by following two approaches: difference for 0–9 scoring of green coloration (chlorophyll) of flag leaf and spike at the late dough stage (GS 87) and a new approach of leaf area under greenness (LAUG). Germplasm lines showed a wide range (7–89) for LAUG and were grouped into four viz., SG, moderately stay green, moderately non-stay green and non-stay green (NSG). However, very few (2.2%) lines showed high expression of SG trait, i.e., LAUG >60. LAUG appeared to be a better measure of SG trait than a 0–9 scale. Mean spot blotch ratings of SG genotypes were significantly lower than those of NSG genotypes at all growth stages. Two spot blotch resistant genotypes (Chirya 3 and Chirya 7) having strong expressions of SG trait were crossed with NSG, spot blotch susceptible cv. Sonalika. Individually threshed F₂ plants were used to advance the generations. SG trait and spot blotch severity were recorded in the parents and F₁, F₃, F₄, F₅, F₆ and F_6–7 generations under disease-protected and inoculated conditions. SG trait in the F₁ generation was intermediate and showed absence of dominance. Evaluation of progenies (202–207) in the segregating generations revealed that SG trait was under the control of around four additive genes. Lines homozygous for SG trait in F₄, F₅, F₆ and F_6–7 generations showed significantly lower mean area under disease progress curve (AUDPC) for spot blotch than those with NSG expression. A positive correlation (0.73) between SG trait and AUDPC further indicated a positive influence of SG on severity of spot blotch. The study established that variation for SG trait exists in spring wheat; around four additive genes control its inheritance in the crosses studied and there is positive association between SG trait and resistance to spot blotch.     

湖泊型风景区一体化规划编制模式探讨——以太行山龙湖风景区为例

针对旅游资源丰富但是经济不发达的湖泊型风景区,分析了其旅游资源开发的迫切性与城乡规划编制缺失的复杂矛盾关系,以及财政不足、时间紧迫的限制条件。解析了一体化编制体系所包含的法定规划内容,以太行山龙湖风景区一体化规划编制为例,介绍了其景区编制技术体系的规划立意,在结合研究区特色的基础上,强调应基于地方性实际状况规划编制活动,奉行简要、快捷和实用性强的规划编制内容,并具体从分层编制和分类编制的角度加以详细阐释。有鉴于此,在特殊环境下倡导一体化编制模式是有必要的,这样能够为全国其他类型地区的规划编制提供一种思路,最终促进当地经济社会实现跨越式发展。     

基于GIS的生态敏感性分析研究——以深圳梧桐山风景区为例

利用ArcGIS9．3的空间分析模块对深圳梧桐山风景区的生态敏感性进行单因子分析和综合评价,以期为该区的生态规划设计和生态环境保护提供科学依据。研究结果表明：不同单因子的生态敏感性分析结果基本相同;项目区内以敏感区和高敏感区的面积最大,占总面积的89％,低敏感区占10％,不敏感区仅占1％。由此可见,项目区极易受外界干扰而发生水土流失等生态环境问题,目前应以生态保护和恢复为主,尽量减少或避免开发性的人为活动。     

风景名胜区居民社会调控规划探析——以龙虎山国家级重点风景名胜区为例

针对龙虎山国家级重点风景名胜区的居民社会发展现状,在综合分析居民社会问题的基础上,提出了优化居民点职能结构、发展旅游经济、完善配套设施、分区分类实施居民社会调控的基本思路和主要措施,从而可为国内相关风景名胜区的居民社会调控提供一定的借鉴作用。     

将农业景观纳入风景名胜区发展体系的探索——以摘星山风景区雁门山景区详细规划为例

农业景观作为一种风景资源,在乡村旅游中发挥着重要作用。将农业景观纳入风景名胜区发展体系中,使二者相互依托、相互促进,是一种新的尝试。笔者以摘星山风景名胜区的雁门山景区详细规划为例,对将农业景观纳入风景名胜区发展体系中进行了探索。     

风景林抚育研究进展

本文分析比较了风景林及相关概念，综述了风景林抚育间伐强度、采伐木选择等关键抚育技术，以及风景林美景度的测定方法，抚育措施与美景度的关系等问题的研究进展。对中国风景区植物景观现状进行了分析，并对风景林抚育的前景作了展望。     

西宁园林植物园风景林建设探讨

建设以溪景林貌为主题,溪水流路为游览线,专类园配置为内容,风景林为表现形式的溪水式生态风景林,是西宁园林植物园风景林规划设计和建设的一种方向思路,其建设方向具有现实的需求性和可操作性。     

河北省易县豹泉景区旅游资源定性评价研究

豹泉景区位于河北省易县,自然资源丰富,历史文化久远。为了促进景区的合理规划开发,对豹泉景区旅游资源进行了分类统计,在此基础上,运用"三三六"评价方法,对景区旅游资源进行定性评价。研究结果表明,豹泉景区旅游资源共有4个主类5个亚类11个基本类型,旅游资源类型较为丰富,景区区位条件优越,市场潜力大,具有较高的开发价值。     

徐州云龙山侧柏林景观评价

为了提高徐州市风景林的景观质量,采用美景度评判法对云龙景区侧柏林的景观进行了评价。结果表明:(1)云龙山侧柏林总体景观质量不高;(2)少数样地因密度较低,树木长势良好,混生有少量阔叶树种而美景度较高;(3)林下植被层覆盖度、林分密度、枝下高、干形、林下层统一度等因素是影响美景度的主要因素;(4)建议通过间伐、补植、抚育、保护等措施把侧柏纯林逐步诱导为针阔混交林。本调查可为风景林的科学经营提供一定的理论基础和技术支撑。