兴安杜鹃、迎红杜鹃播种繁殖技术的研究

兴安杜鹃、迎红杜鹃是杜鹃家族中比较耐寒的种类,其花色艳丽芬芳,深受人们喜爱,解决这两种杜鹃因种子繁殖难的问题是快速发展这两种优良观赏花木的关键问题;选取不同的播种时间、不同的覆盖物、不同的移苗期进行对照,通过多重比较分析选出兴安杜鹃、迎红杜鹃的最佳播种繁殖技术。     

七彩杜鹃争艳 共享美丽家园

春和景明花争艳,风暖云轻蕊吐芳。4月16日,以“七彩杜鹃,美丽家园”为主题的2013中国（嘉善）杜鹃花展在嘉善杜鹃,美丽家园”为主题的2013中国（嘉善）杜鹃化展在嘉善辨云花旧隆重开幕。     

高山杜鹃花期和蕾期生理指标变化的研究

本实验选取高山杜鹃的花期和蕾期叶片为研究材料.通过对超氧化物岐化酶(SOD)、过氧化物酶(POD)、可溶性糖、总糖、丙二醛含量等各项指标的测定,分析不同高山杜鹃不同时期叶片各指标的变化规律,为杜鹃属植物的进一步研究提供理论基础.     

湖南植物专家发现植物新种——天门山杜鹃

湖南省森林植物园植物学专家彭春良、颜立红近日在对湖南省张家界天门山国家森林公园进行植物资源考察中发现杜鹃花科植物新种——天门山杜鹃。天门山杜鹃为常绿灌木或小乔木，当年生小枝黄褐色，无毛。花期4～5月，果期8～9月。据悉，天门山杜鹃系亚高山杜鹃组成员，是西南大理杜鹃花亚组向北延伸的边缘种，     

环境因子和植物生长调节剂对高山杜鹃开花的影响

研究了不同温度、光照、植物生长调节剂浓度对高山杜鹃生长和开花的影响,结果表明:高山杜鹃花蕾萌动到开花的过程中,适宜光照强度2000~3000lux,最佳温度范围是23~25℃;对供试品种而言,最佳赤霉素浓度范围是1.0~1.5mg/L.     

兴安杜鹃一新珍稀变种——重瓣兴安杜鹃

在2012年至2013年10月份的生物多样性调查中,发现了一片兴安杜鹃重瓣变种-重瓣兴安杜鹃。它花为重瓣,花瓣2~6层,粉色。部分雄蕊花药特化为花瓣状,浅粉色。它是自然界一珍稀变种,观赏价值很高,应切实加强保护和管理。要采取人工组织培养、人工种子繁殖或转基因等方式,来扩大种群数量,或培育新的杜鹃花品种,用于植物园建设、城市园林绿化和家居观赏花卉,为人类造福。     

沼渣花卉栽培营养基质应用研究

以猪粪和牛粪为主的沼渣作为原料,复配木屑、草炭和蛭石,形成5种适合喜酸性花卉的栽培基质,并在比利时杜鹃上进行栽培试验。在对不同基质组分理化性状分析的基础上,研究5种栽培基质对杜鹃植株营养生长,生殖生长的影响;及基质pH值的变化特点,为沼渣类基质的应用奠定基础。     

贵州毕节试验区高山杜鹃产业发展战略研究

以科学发展观为指导,紧扣毕节试验区"开发扶贫,生态建设"发展主题,保护资源和合理开发利用相结合,发展高山杜鹃产业,构建"花卉产业、旅游、生态建设"三位一体的区域经济可持续发展模式,为我国西南山区生态现代化建设和区域经济发展提供借鉴和参考。     

五款新杜鹃

待嫁新娘"喜临门"该品种从锦绣杜鹃的芽变枝条选育出来的。高60～80厘米。适宜栽植于温带大多数地区,更适宜在20%的荫蔽度下生长。要求湿度为30～40%。适宜的土壤为富含有机质的腐殖土,栽培时在苗期要注意施肥,要薄肥勤施,每隔10天施一次0.5%的氮肥能促进生长。     

龙泉山上千年杜鹃

你见过高3米、胸径30-40厘米的杜鹃吗？这两棵已长成大树的猴头杜鹃，是华东最大的杜鹃王，红色的花苞，花朵却是白色的。它们就安家在龙泉山黄茅尖景区，据专家估计，已有1000多年历史。     

我国政府农村扶贫中的组织效率问题分析

本文通过建立监督博弈模型。对我国中央政府和地方政府之间的委托代理关系选行博弈分析，并以此判断我国目前政府扶贫的组织效率，认为目前政府扶贫效率低下的一个主要原因是。扶贫体制的组织效率低下。进而建议中央政府应采取提高监督效率、增加惩罚力度和实行激励等措施，以有效提高政府扶贫的组织效率。     

分株紫萁的研究进展

综述了近几年国内外对分株紫萁(Osmunda cinnamoneaL.var.asiatica Fern.)的研究概况,从形态学、生物学、生理生态学、栽培和繁殖方法、药用价值及化学成分分析、营养价值及加工方法诸方面加以阐述,并提出了分株紫萁研究的展望。     

Seasonality and unit roots: the demand for fruits

We apply seasonal unit root tests to apple and pear price and quality data. We then develop a method for testing shifts in amplitude and/or phase of the seasonal cycles. The results have implications to speifications of models which use short-run data (quarterly, monthly).     

Does Food Safety Information Impact U.S. Meat Demand?

A theoretical model of consumer response to publicized food safety information on meat demand is developed with an empirical application to U.S. meat consumption. Evidence is found for the existence of pre-committed levels of consumption, seasonal factors, time trends, and contemporaneous own- and cross-commodity food safety concerns. The average demand response to food safety concerns is small, especially in comparison to price effects, and to previous estimates of health related issues. This small average effect masks periods of significantly larger responses corresponding with prominent food safety events, but these larger impacts are short-lived with no apparent food safety lagged effects on demand.     

美国农地保护及其借鉴

经过数十年的探索与积累,美国农地保护取得了一些经验和成果。美国农地保护的方法与措施大体可分成四大类型:法律法规调控型、激励机制型(市场经济手段)、政府参与型及其他配套型。美国农地保护的突出特点:(1)保护的方法多样,体系完善,具有互补性和互换性,在保护的同时注意保护农地所有者的合法利益;(2)特别注重公众的参与性;(3)美国的农地保护成功之处在于使土地所有者和农民都能成为受益人。文章在借鉴美国农地保护相关经验的基础上,提出了中国农地保护的建议。     

影响滨州冬枣价格变动的因素分析

通过分析冬枣市场价格变动趋势,根据供求理论,从生产成本、枣农的预期及政府政策的导向3个方面阐述了影响冬枣供给的因素,又从冬枣品质的下降、替代果品的出现及采购商讨价还价能力3个方面分析了影响冬枣需求的因素。研究发现,供给大于需求的局面逐渐产生,需求不足是影响冬枣价格的主要因素,进而提出尝试"冬枣树银行"种植模式、延长冬枣产业链、建立枣农合作组织来刺激需求,保障枣农权益。     

Estimating the U.S. Import Demand for Melons: A Dynamic Analysis Approach

The United States is one of the world's leading consumers as well as one of the world's leading producers of melons. However, U.S. melons are produced only from May through December. In order to supplement the domestic demand and make melons available year-round, the United States imports melons from Latin American countries. This article analyzes the U.S. demand for imported fresh and frozen melons using monthly data on import volumes and values. A static and a dynamic linear Almost Ideal Demand System are estimated using Seemingly Unrelated Regression (SUR). The estimated parameters are used to estimate the short- and long-run price and expenditure elasticities.     

The Role of Guanxi Networks in Vegetable Supply Chains: Empirical Evidence from P.R. China

This study attempts to empirically investigate how the concepts of relationship marketing affect market performance in Chinese vegetable sector. We interviewed 167 vegetable farmers and 84 processing and exporting companies to test our conceptual relationship model. Results demonstrate that personal relationships (called guanxi in China) significantly improve interpersonal trust and transaction-specific investments, which eventually show a significant impact on market performance. Results imply that the impact of guanxi networks differ on farmers and on companies. The study also reveals that transaction-related attributes (such as risk, channel requirements, and transaction conditions) influence trust, investment behavior, and market performance together with guanxi networks. The article ends with several managerial implications regarding the development of relationship marketing in China.     

The Nested PIGLOG Model: An Application to U.S. Food Demand

A new demand system is introduced, the Nested PIGLOG model, nesting thirteen other demand systems including five that are also new. This new model and its nested special cases are applied to models of U.S. food demand that include food-at-home (FAH), food-away-from-home (FAFH), and alcoholic beverages. Although nested tests and out-of-sample forecasting performance favor generalizing models to a certain degree, statistically insignificant improvements to in-sample-fit and even poorer out-of-sample forecast accuracy undermine further generalizations. Based on a subset of preferred models, FAFH is found to be price and income elastic compared to FAH which is price and income inelastic.     

对水利部预算执行动态监控有关问题的思考

水利部自开展预算执行动态监控工作以来,通过加强顶层设计、强化监控结果运用等多项措施,取得了较好的成效,但在监控数据的获得、监控内容的广度和深度、监控的信息化程度等方面依然存在一些问题。通过对水利部预算执行动态监控现状和问题的分析,提出进一步通过有效解决监控数据问题、加强信息系统建设等方式,切实加强水利部预算执行动态监控工作,保障水利资金的安全。