国内外绿豆农药最大残留限量标准对比研究

为了研究农药最大残留限量标准对中国绿豆对外贸易的影响,以中国、国际食品法典委员会(CAC)、欧盟、日本、美国、韩国和加拿大等国家绿豆农药最大残留限量标准为基础,从限量标准数量、限量大小和占比、限量宽松度等方面对比分析中国与贸易国之间的差异.结果发现,中国绿豆农药最大残留限量标准少,共83项,与日本的388项、欧盟的56...     

以美国纽约市高线公园为例论公共空间种植设计

简述了纽约市高线公园的设计背景及设计策略,着重分析其植物景观营造手法,以期为公共空间种植设计提供参考。     

美国与欧盟的转基因食品安全性政策演变比对(英文)

随着转基因食品的研究与发展,人们对待转基因食品的态度表现为主要以美国和欧盟为主的两种代表性政策美国采取遵循可靠科学原则,坚决反对预防原则,即对转基因食品采取积极支持,自愿标识的宽松政策;欧盟采取谨慎预防原则,必须标识和可追溯从管理原则出发,结合相应采取的监管措施和相关条例,对两国从开始颁布转基因食品政策到当下态势的发展,并结合最新出台的政策进行跟踪分析,比对美国及欧盟对这些指令和条例的执行情况。     

美国马铃薯产业发展及启示

为推进中国马铃薯产业的健康发展,研究和分析美国马铃薯产业的成功经验十分必要。美国是世界上第5大马铃薯生产国,种植面积和总产量均不及居于世界首位的中国,但是却在马铃薯的世界贸易中处于领先地位,成为世界上利用马铃薯挣钱最多的国家。通过研究发现:严格的行业标准是美国马铃薯产业发展的先决条件;科技创新是美国马铃薯产业飞速发展的机制要素;马铃薯产业化及产业链的整体延伸是美国马铃薯升值的重要基石;强有力的协会是美国马铃薯产业持续发展的有效支撑。经分析可知,马铃薯加工产业化是美国马铃薯加工企业的有效模式和成功经验。     

楚国的生态环境与农业特征

从整体上看,楚国的生态环境处在第二个温暖期。考古发现和文献记载表明,优越的农业生态环境是楚国农业发展的前提,确定了中国古代南方稻作农业发展的方向,为楚国的崛起和兴盛奠定了坚实的物质基础。     

The impact of resistance on the use of second-generation anticoagulants against rats on farms in Southern England

Resistance amongst rats to second-generation anticoagulants, notably difenacoum, has been recognised since the 1970s. Although initially considered to be of practical significance, doubts were subsequently expressed that the degree of resistance was sufficient to explain ineffective rodenticide treatments. Research published elsewhere demonstrated the overriding importance of poor poisoned bait consumption, caused by the influence of certain ecological factors on rat behaviour, in reducing the effectiveness of second-generation anticoagulant treatments on farms in southern England. In this paper we consider, however, the subtle effects of resistance to anticoagulants on treatment outcome. The prevalence of resistance was increased amongst survivors of treatments and bait consumption by resistant survivors was higher than amongst susceptible survivors. The overall prevalence and degree of resistance to second-generation anticoagulants does not, however, currently represent a practical problem. Nevertheless, selection favouring increased resistance remains a long-term threat to the effectiveness of both difenacoum and bromadiolone.     

从美国旅游营销管理看海南建设国际旅游岛

通过专题讲座、座谈交流和实地考察等形式的“旅游管理与营销”培训,考察了美国旅游产业的发展规划、旅游管理、旅游产品营销策划以及旅游资源开发与保护等方面的现状,学习其发展经验和先进理念.对比定安目前的旅游开发现状,提出一些建议,希望为海南国际旅游岛建设提供参考.     

世界及我国奶山羊产业发展现状及趋势分析

近年来,世界山羊养殖数量持续增长,据联合国粮农组织(FAO)统计显示,2018年全球山羊养殖数量已超10.4亿只,其中奶山羊养殖数量超2.16亿只,约有90%以上的奶山羊和山羊奶产自亚洲和非洲。欧洲的奶山羊存栏和产奶量均在亚洲和非洲之后,但其单产水平远高于其他各大洲,在世界奶山羊每只平均年产奶量100 kg以上的国家中,前十位均为欧洲国家。我国奶山羊产业发展迅速,2018年我国奶山羊实际存栏约518万只,年产羊奶量约100万t,约占全国鲜奶产量的3.3%。本文对全球及我国奶山羊产业进行了纵向和横向比较,客观分析我国奶山羊产业的地位、发展现状以及未来发展趋势,旨在为我国奶山羊产业的发展提供参考。     

Restoration, reconciliation, and reconnecting with nature nearby

Biotic homogenization is in many ways a function of spatial and temporal scale. Another aspect of this phenomenon that perhaps receives somewhat less attention is related to “the scale of human experience”, particularly in the way that people view homogenization. Here, I examine the relationship between scale and efforts to reverse the loss of native species using two case studies in the Midwestern U.S. Both of these are focused on the restoration of prairie, one in a rapidly urbanizing area and one in a rural context. At a large reserve in a rural area, it is possible to restore prairie at a scale that is sufficient to accommodate populations of grassland obligate birds. This is an unrealistic goal, however, for small reserves in the midst of suburban development and rapidly escalating land prices. Small reserves in this context may be suitable for taxa with smaller habitat requirements, but also have a vital role in reversing biotic homogenization by enabling people to experience nature directly. Not only does this improve their quality of life, but may also foster support for efforts to maintain biodiversity in more remote locations. Thus, the goals of conservation and ecological restoration at various points on the land-use gradient are somewhat different but complementary and inter-related. Conservation scientists have an obvious role in the restoration and management of large reserves, but they also have an important part to play in restoring and maintaining elements of biodiversity in cities and suburbs.