黑珍珠樱桃在黔北地区的生物学特性及栽培技术

历经7年(2003-2009年)对黔北地区黑珍株樱桃进行了引种观察和栽培试验。结果表明:定植后第2年部分植株开花结果,第3年大部分植株开花结果,第4年植株普遍开花结果,第5～6年以后进入盛果期。植株抗病、抗虫性较强,同时抗低温、抗旱、抗裂果较强。在海拨800～1200m,平地、山地和坡地栽植生长结果均良好。并提出了采用高标准建园、配方施肥、合理修剪、保花保果、合理疏花疏果、有效防治病虫害和合理采收等配套的栽培措施。     

Environmental assessment of boreal rivers using fish data – a contribution to the Water Framework Directive

Abstract A fish‐based assessment method was developed to estimate the ecological status of boreal rivers. Electric fishing data were collected from 902 rapids, together with information on the land use, channel modification and water chemistry. Discriminant function analysis was used to select fish variables that most correctly classified the undisturbed reference sites and human impacted sites into exact classes. The relationship between the level of human alteration and fish metrics was examined. Five metrics were selected for the index: the number of fish species, proportion of sensitive species, proportion of tolerant species, density of cyprinid individuals and the density of age‐0+ salmonids. The value for each metric (between 0 and 1) was calculated according to a point estimate for classical probability. The index is used to estimate the ecological classification of rivers according to the EU Water Framework Directive.     

百里香精油的生物学功能及其在鸡生产中的应用

本文就百里香精油的生物学功能及其在鸡生产中的应用研究作一综述。     

榆紫叶甲无公害防治技术研究

根据榆紫叶甲的发生规律及生活习性,进行了榆紫叶甲无公害防治试验,结果表明：在成虫羽化始盛期,树干上喷绿色威雷200倍液,杀虫率达97.1%;在越冬成虫上树取食始盛期,用溴氰菊酯制成毒笔,每株树涂2个药环,杀虫率达95.9%;在榆紫叶甲卵孵化盛期,利用3%高渗苯氧威、25%灭幼尿3号悬浮剂、1.8%阿维菌素、20%菊杀乳油1 000～1 500倍液进行喷雾防治,杀虫率均在92.4%以上。     

溧阳市生物多样性评价

为溧阳市生物多样性的保护与利用提供依据,以溧阳市生物物种资源普查成果报告和溧阳天目湖森林公园植物资源调查报告为本底数据,采用综合指标体系评价方法对溧阳市生物多样性进行评价。结果表明:溧阳市生物多样性的综合评分为75分,其中物种多样性评分为35分,生态系统多样性评分为40分。溧阳市生物多样性评价结果等级为一般。     

大兴安岭湖通河野生五味子药用资源保护区自然生态质量评价分析

从植被类型多样性、物种多样性、生态系统的稳定性和脆弱性、面积适宜性几个方面对大兴安岭湖通河五味子药用资源保护区的自然生态质量进行了评价和分析。     

藏系绵羊遗传多样性的研究进展

本文系统的论述了藏系绵羊在表型和地域、形态学遗传标记、细胞学遗传标记、生化遗传标记和分子遗传标记等不同方面的遗传多样性研究的概况，说明了藏系绵羊的遗传多样性研究目前仍处于起步水平，因此有必要对藏系绵羊的遗传多样性进行更深入的研究，尤其加强DNA分子水平上的研究。     

病毒杀虫剂在我国无公害茶园防治中的应用现状与展望

茶叶作为一种食品，其安全问题受到越来越高的关注。病毒杀虫剂具有专一性强、安全性高、持效作用长、能有效地控制害虫种群密度等特点，成为生物防治的研究热点。现就病毒杀虫剂在我国无公害茶园中的应用现状进行综述，并展望未来发展趋势。     

Maize Hybrid Variability for Transpiration Decrease with Progressive Soil Drying

Drought is ubiquitous in rainfed cropping systems and often limits maize yields. The sensitivity of transpiration response early in progressive soil drying is a trait with potential to improve crop drought resistance. Simulation studies demonstrated that increased sensitivity to drying soil leading to restricted transpiration rates results in conservation of soil water during vegetative stages for possible use during grain filling. In contrast to other crops, there have been no studies characterizing genotypic variability for this trait in maize. Experiments in controlled environments were conducted to characterize the fraction of transpirable soil water (FTSW) threshold on drying soil for 36 hybrids selected for variation in the field for drought resistance, regions of adaptation and stay green. While FTSW thresholds varied among hybrids from 0.60 to 0.33, these thresholds were not uniformly associated with level of drought resistance in the field. Nevertheless, this study demonstrated a high FTSW threshold corresponded with drought resistance observed in some modern maize germplasm (hybrids #7, 17, 24, 27 and 32). This knowledge can enable breeding work seeking to exploit this adaptive trait to improved drought tolerance in low threshold FTSW germplasm.     

Floristic diversity and vegetation patterns along disturbance gradient in arid coasts in southern Mediterranean: Case of the Gulf of Gabès,southern Tunisia

Knowledge about vegetation patterns along disturbance gradients is essential for conservation and management of coastal habitats in arid regions. This study focuses on the floristic diversity and the factors controlling the vegetation structure in the Gulf of Gabès (Tunisia). For this purpose, the floristic diversity of 120 relevés belonging to three coastal sites with different disturbance levels (40 relevés per site) was analyzed in relation with 10 environmental and anthropogenic factors. Therophytes constitute 54% of the 237 plants species belonging to 44 families identified in the present study. The species richness and floristic diversity indices exhibited a similar trend and peaked in the slightly disturbed site (H′?=?3.38; S?=?176). The similarity between sites was relatively low and reached its maximum between the little and the highly disturbed sites. Two-way indicator species analysis and detrended correspondence analysis applied on the floristic data resulted in groups mainly determined by disturbance level by explicitly segregating the three sites. Canonical correspondence analysis (CCA) indicated that the spatial pattern of species composition was mainly influenced by anthropogenic variables. Partial CCA revealed that the effect of anthropogenic variables on floristic composition was thrice higher than the effect of environmental variables (57.5% vs. 18.4%, respectively). Overall, this study provides a broad understanding of the floristic diversity and vascular plant richness in the Gulf of Gabès. The obtained results reflected a disturbance–diversity pattern and thus revealed the obvious importance of maintaining the intermediate disturbance for biodiversity conservation and monitoring.