不同药剂对水稻细菌性条斑病的防治效果评价

为有效控制水稻细菌性条斑病病害,科学合理选用防治正安县地区水稻菌性条斑病的杀菌剂,本研究以当地主要栽培水稻品种“宜香优2115”为试验材料,测定了60%唑醚·代森联、6%春雷霉素、20%吡唑醚菌酯、40%稻瘟灵对水稻菌性条斑病防治效果及生长发育和产量的影响。结果表明:不同药剂防治下水稻细菌性条斑病病情指数和防治效果间存在差异性显著(p＜0.05),20%吡唑醚菌酯对水稻细菌性条斑病的病情指数最低和防治效果最优;较喷施清水对照处理相比,60%唑醚·代森联、6%春雷霉素、20%吡唑醚菌酯和40%稻瘟灵施用时水稻叶面积指数和干物质积累量增幅分别为10.29%、13.48%、15.17%、12.92%和15.15%、16.77%、18.92%、17.31%;20%吡唑醚菌酯施用时的水稻穗粒数和产量最高,分别为61.76穗/粒和627.75kg/亩。本研究可为遵义市正安县地区水稻生产中细菌性条斑病的防治提供理论依据和数据支撑     

探析高职学生阅读心理,有效开展阅读指导工作

有效开展读者阅读指导工作是摆在高职院校图书馆面前的一项重要任务,文中通过高职学生阅读心理现状分析,探讨了做好高职院校读者阅读指导工作的方法与途径。     

国家农业图书馆文献资源结构分析

对国家农业图书馆2002-2004年中外文馆藏图书以及2002-2005年的中外文原版期刊中的农业科学、生物科学和食品加工三个领域的文献进行了统计与分析。     

电子资源在馆藏建设中的地位和作用

论述了电子资源的特点、在馆藏建设中的功能、作用,以及需要贯彻的原则。     

关于《中图法》第四版现代舞、交际舞及体育舞蹈类目设置的探讨——兼与张晶老师商榷

针对现代舞、交际舞、体育舞蹈等类图书归类时出现的归类混乱的问题进行了详细分析,指出了《中图法》四版在此类类目设置的不足之处,并提出了解决问题的办法。     

国家农业图书馆文献利用率现状分析

以国家农业图书馆为例。对2002-2004年中西文重点学科图书和2004-2005、10的现刊利用进行分学科统计,调查显示：在2002-2004年间,中文图书利用率最高的为食品加工类文献,利用率为55．3％,西文为生物学文献,利用率为8．1％：从中西文重点学科图书借阅重的时间分布上看,图书借阅有两个高峰期,分别为3-4月和9-12月;另外本文还对农业各类文献的利用进行统计分析,发现中文图书利用率最高的是农业综合类图书（S）,达到了25％,西文为盲牧兽医（S8）,达到22％。现刊统计发现。中西文利用频次最高的都是生物学文献,中文2004年阅读频次为18次／册,2005年9．5次／册;西文2004年阅读频次为4．1次／册,2005年3．2次／册。     

“政产学研”视角下农机装备产业SWOT分析

本本研究旨在基于SWOT理论分析农机装备“政产学研”融合服务产业的发展,探讨其优势、劣势、机会和威胁,并提出相应的发展策略。通过查阅资料和调查研究相结合的方法,分析了“政产学研”视角下农机装备产业的研究意义,介绍了SWOT理论概述。“政产学研”视角下对农机装备产业的优势、劣势、机会和威胁进行了分析,并提出了策略与建议,为农机装备产业的发展提供借鉴。     

Effects of mutations in Drosophila nicotinic acetylcholine receptor subunits on sensitivity to insecticides targeting nicotinic acetylcholine receptors

Several strains of Drosophila melanogaster possess mutant alleles in nicotinic acetylcholine receptor (nAChR) subunits, Dα1 and Dβ2 that confer resistance to neonicotinoids such as imidacloprid and nitenpyram, and Dα6, that confers resistance to spinosyns. These mutant strains were bioassayed with a selected set of nAChR active insecticides including neonicotinoids, spinosad, and sulfoxaflor, a new sulfoximine insecticide. All of the neonicotinoids examined, except dinotefuran showed reduced insecticidal efficacy on larvae of the Dα1 mutant, suggesting that this subunit may be important in the action of these insecticides. All of the neonicotinoids, including dinotefuran, showed reduced insecticidal efficacy on larvae possessing the Dβ2 mutation. A similar pattern of broad neonicotinoid resistance to that of Dβ2 alone was also observed for larvae with both the mutations (Dα1 + Dβ2). The Dβ2 mutation exhibited a lower level of cross-resistance to sulfoxaflor (<3-fold) than to any of the neonicotinoids (>13-fold). In contrast, there was no cross-resistance for any of the neonicotinoids or sulfoxaflor in adult flies with the Dα6 mutation, which confers high levels of resistance to spinosad. Thus in the D. melanogaster strains studied, target site resistance observed for the neonicotinoids and the spinosyns does not translate directly to resistance towards sulfoxaflor.     

生物多样性在害虫控制中的生态功能与机理

生态学的有害生物治（EBPM）或生态管理（EPM）是新世纪农业有害生物防治的新对策。应用系统工程的原理和方法改变农田生态系统生物多样性,进行害虫生态控制将越来越受到人们的重视。通过农田生态系统生物多样性、调节农田生态系统多样性对天敌和害虫的影响以及生物多样性控制害虫的机制及生物多样性在害虫生态控制中的利用前景4个方面,论述农田生态系统生物多样性在害虫控制中的生态功能与机理。     

Vegetation fractional coverage change in a typical oasis region in Tarim River Watershed based on remote sensing

Vegetation fractional coverage(VFC) is an important index to describe and evaluate the ecological system.The vegetation index is widely used to monitor vegetation coverage in the field of remote sensing(RS).In this paper,the author conducted a case study of the delta oasis of Weigan and Kuqa rivers,which is a typical saline area in the Tarim River Watershed.The current study was based on the TM/ETM+ images of 1989,2001,and 2006,and supported by Geographic Information System(GIS) spatial analysis,vegetation index,and dimidiate pixel model.In addition,VBSI(vegetation,bare soil and shadow indices) suitable for TM/ETM+ images,constructed with FCD(forest canopy density) model principle and put forward by ITTO(International Tropical Timber Organization),was used,and it was applied to estimate the VFC.The estimation accuracy was later proven to be up to 83.52%.Further,the study analyzed and appraised the changes in vegetation patterns and revealed a pattern of spatial change in the vegetation coverage of the study area by producing the map of VFC levels in the delta oasis.Forest,grassland,and farmland were the three main land-use types with high and extremely-high coverage,and they played an important role in maintaining the vegetation.The forest area determined the changes of the coverage area,whereas the other two land types affected the directions of change.Therefore,planting trees,protecting grasslands,reclaiming farmlands,and controlling unused lands should be included in a long-term program because of their importance in keeping regional vegetation coverage.Finally,the dynamic variation of VFC in the study area was evaluated according to the quantity and spatial distribution rendered by plant cover digital images to deeply analyze the reason behind the variation.