南天竹栽培性状研究

1材料与方法 1．1材料试验于2005年4月在湖南长沙中南林业科技大学植物园试验地进行。试材来源见表1。     

Distribution of infectious pancreatic necrosis virus (IPNV) in wild marine fish from Scottish waters with respect to clinically infected aquaculture sites producing Atlantic salmon, Salmo salar L

This study represents the first large-scale investigation of IPNV in Scottish wild marine fish. Kidney samples were taken from 30 627 fish comprising 37 species and 45 isolations were made from nine different species, illustrating these as reservoirs of IPNV in Scottish waters. The estimated prevalence of IPNV in the Scottish marine environment was low at 0.15% (90% confidence intervals, (CI) of 0.11-0.19%). This was significantly greater in fish caught less than 5.0 km from IPN-positive fish farms in Shetland, at 0.58% (90% CI of 0.45-0.77%). This prevalence persisted and did not significantly decrease over the 16-month period of study. The estimated prevalence of IPNV for each positive species was less than 1% with the statistically non-significant exceptions of flounder, Platichthys flesus (L.), at 12.5% (90% CI of 0.64-47.06%) and saithe, Pollachius virens (L.), at 1.11% (90% CI of 0.49-2.19%). The 45 isolates were titrated and all but two were below the detection limit of the test (<55 PFU g(-1)). Titres of 3.8 x 10(2) PFU g(-1) and 2.8 x 10(1) PFU g(-1) were calculated from common dab, Limanda limanda (L.), and saithe, respectively. This study provides evidence that clinical outbreaks of IPN in farmed Atlantic salmon may cause a localized small increase in the prevalence of IPNV in wild marine fish.     

Soil Characteristics and Mineral Nutrient in Wild Jatropha Population of India

Abstract

Mature leaves of naturally occurring Jatropha curcas plants and soils samples were collected from four different populations to determine the soil characteristics, soil‐available nutrients, and leaf nutrient contents. This study provides a reliable account of the endogenic concentrations of nutrients present in jatropha leaves. Soil manganese [diethylenetriamine pentaacetic acid (DTPA)‐Mn] was the only soil‐available nutrient significantly correlated with its content in the plant. Relationships between soil characteristics, available nutrient in soil, and their content in plant leaves were also attempted.     

大雁感染新城疫的病理学观察

本试验对1例感染新城疫的大雁进行了大体病变和组织病理学的观察。剖检结果表明，感染大雁肠道有明显的出血和坏死，腺胃及心内膜出血，符合新城疫感染的特征性病变。组织病理学观察显示小肠、脾脏和肝脏有严重的坏死性病变，肾小球严重萎缩。试验结果为野生水禽新城疫感染的病理组织学研究提供了相应的参考依据。     

锦绣黄桃优变株系果实贮藏保鲜性能比较试验

在常温（28～35℃）与（5±1）℃低温条件下,对硕锦1号、硕锦2号、硕锦3号等3个锦绣黄桃优良变异株系的贮藏果实品质变化与保鲜性能进行研究。结果表明,在常温条件下,3个优变株系的果实可溶性固形物、可滴定酸、总糖含量及果实硬度、好果率、果实保水率均随着贮藏时间的延长而降低,贮藏保鲜性能均略差于锦绣黄桃,贮藏期均以不超过6d为宜;在低温条件下,3个优变株系的各项贮藏保鲜性能指标变化趋势和表现与常温下相近,贮藏期均以不超过16d为宜。     

罂粟植株不同部位吗啡含量测试

采用HPLC法测定罂粟茎、叶、壳部位中吗啡的含量，其色谱条件为：色谱柱HypersillC18(5 μm，4.6 nm×250 nm)；流动相：磷酸二氢钾(0.05 mol/L):庚烷磺酸钠(0.002 5 mol/L):乙腈=(5:5:2)；检测波长220 nm。结果显示：罂粟植株中吗啡含量依次为：壳>叶>茎>；罂粟壳中吗啡的含量为2.567 %-3.455 %，叶中含量为1.742 %-2.653 %，茎杆中含量为0.128 %-0.467 %。     

乌鲁木齐市鲤鱼山野生观赏植物及其利用潜力分析

在对鲤鱼山的野生观赏植物进行全面调查的基础上,通过标本采集,分类鉴定和研究分析,结合株型、开花、花色、花序、花期等观赏特点,从中筛选具有一定观赏价值的野生观赏植物31种,隶属于19科,31属,依据其在园艺上的用途分为花灌木、草本花卉和垂直绿化植物三类。该文着重介绍了鲤鱼山野生观赏植物最佳观赏期、季相、观赏部位等应用要素;详细分析了它们的园林用途和配置形式,这31种野生观赏植物用途广、观赏价值高,具有很好的开发前景,可为城市的绿化美化提供适宜的乡土野生观赏植物,突出城市的地方特色;同时也可为培育花卉新品种提供育种材料。作者提出了合理开发利用及保护建议。     

防治小麦赤霉病微生物菌株的筛选与利用

通过微营养培养分离拮抗菌和淀粉发酵法分离营养竞争性菌株，共分离到１３９个菌株，其中拮抗性菌株１２３个（１１８个细菌，５个放线菌）营养，竞争性菌株１６个（３个酵母菌，１３个细菌）。通过离体试验，３０个拮抗菌仍表现出明显的防治效果，占总数的２１．６％。经温室试验测定，９个菌株防治小麦赤霉病效果达７０％以上，占总数的６．５％。经大田小区只有ＹＮ１、ＧＪ６、Ｙ－１２等３个菌株分别表现出６７．６％、６４．９     

天山野果林生态系统受损现状及其保护

天山自然资源丰富,是新疆人民世世代代赖以生存和发展的天然宝库,野果林生态系统是其重要的组成部分, 国干旱     

巩留野核桃林土壤的形成及其特征特性

本文研究了我国唯一的野核桃自然保护区的野核桃林土壤的形成条件、形成过程、剖面特片及理化特性。野核桃在巩留凯特明山前峡谷的繁衍生息，并发育着野核桃林土壤，是特殊的地质历史条件和小气候等综合作用的结果，野核桃土壤在长期特定的生物、气候条件下，其腐殖化过程和钙积化过程明显，粘化过程较弱。土壤剖面含硅铝高，但分异明显，具有特色。ＡＳ和Ａ１层质地适中，土体温润，结构良好，富含有机质和养分，春肥力较高，林木自