洛阳观光农业发展现状及前景分析

在调查洛阳观光农业发展现状的基础上,对其进行分析,提出了一些建议,并对其发展前景进行了展望。在对洛阳观光农业存在的模式、发展现状、优势以及不足等问题进行了分析后,指出目前洛阳观光农业正朝着不断成熟、完善、多元化的趋势发展,但总体上仍处于起步阶段,主要表现在旅游产品类型比较单一,配套设施不齐全、项目创意等方面仍需大的投入的结论。建议应从拓展观光农业旅游类型、加大宣传力度、拓展资金来源等方面着手。洛阳观光农业在发展过程中,只要合理有效地解决现在存在的问题,克服劣势,迎接挑战,发展前景十分广阔。     

新形势下加快农业科研单位种业发展的实践与探索——以河南省农业科学院为例

文章结合当前我国种业发展的新形势,以河南省农业科学院为例,详细阐述了其种业发展历程、发展现状及存在的问题,并从创新种业科研体制机制、加快推进种子企业兼并重组、成立种业研究院、重视人才引进与培养、加强科企合作、组建高新技术集团等方面提出了加快农业科研单位种业发展的思路,以期为促进全国农业科研单位种业的快速发展提供参考。     

大兴安岭林区森工采运方式现状及发展趋势研究

本文论述了大兴安岭林区采运方式现状。分析了影响采运方式的因紊。提出了今后的发展方向。     

高校图书馆服务于农村劳动力教育培训研究

本文就高校图书馆教育培训优势,以及如何利用图书馆对农村劳动力教育培训进行研究,旨在为当前农村劳动力素质提高拓展新途径.     

陕西省旅游中心城市体系建设现状与发展对策研究

针对陕西省旅游中心城市体系建设现状中存在的中心城市发展较少、旅游者首选旅游目的地不足等问题，提出依托旅游区域合理发展旅游中心城市体系的建议。     

豚草卷蛾越冬基数的现状及保护对策

豚草卷蛾是豚草的重要天敌，它以老熟幼虫在茎杆内越冬，根据调查每株豚草上不足1只豚草卷蛾越冬幼虫，所以冬季保护和增加豚草卷蛾越冬幼虫顺利越冬，是利用豚草卷蛾进行生物防治控制豚草漫延的重要环节。     

泰山岱庙古树名木的现状与保护

为掌握泰山岱庙古村名木的生长状况，在进行调查的基础上分析了古树名木生长不利的因素，提出了泰山岱庙古树名木保护中存在的问题，并阐述了古树名木的保护措施。     

对“三级区划线“的讨论

从3个方面对黑龙江省森工林区三级区划线的现状和改进措施进行了探讨。     

Mesoscale eddies and survival of late stage Pacific sardine (Sardinops sagax) larvae

We examined the distribution of sardine larvae relative to environmental conditions with the purpose of identifying and characterizing habitat that encourages high larval growth and survival, based on the 1983–1998 surveys of the California Cooperative Oceanic Fisheries Investigations (CalCOFI). Long-term averages show that sardine 'survivors' (spatially aggregated larvae ≥ 18 days old) were most abundant offshore, whereas sardine egg density, chlorophyll biomass and zooplankton volume were greatest inshore. In contrast, mesoscale eddies, observed in remotely sensed sea surface temperature imagery, were found only in offshore regions. To further examine the link between eddies – which often result in locally elevated chlorophyll and zooplankton – and sardine survival, we compared the distribution of larvae and eddies survey by survey. Sardine survivors were most abundant offshore in only one-quarter of the research surveys, and when they were most abundant offshore they were associated with eddies. This indicates that the offshore eddy habitat produced exceptionally large numbers of survivors, as evidenced by the disproportionate effect on the long-term average.     

Influences of El Niño on assemblages of mesopelagic fish larvae along the Pacific coast of Baja California Sur

Seasonal assemblages of mesopelagic fish larvae and changes related with environmental factors (plankton biomass, sea surface temperature anomaly, upwelling, and the multivariate El Niño index) were investigated. From 1982 to 1987, 16 oceanographic cruises were carried out along the Pacific coast of Baja California Sur, Mexico. Larvae of 42 mesopelagic fish taxa were collected. Larval abundance was highly variable during the studied period, but summer months coincided with higher abundance (>200 larvae under 10 m²). Larval assemblages were dominated by three of the most common species of tropical (Vinciguerria lucetia, Diogenichthys laternatus) and subtropical affinity (Triphoturus mexicanus). A group of species of tropical affinity (Diplophos proximus, Diaphus pacificus, Benthosema panamense) was useful for distinguishing the 1982–84 El Niño event, and an assemblage of larvae of temperate affinity (Symbolophorus californiensis, Melamphaes lugubris, Bathylagus ochotensis, Leuroglossus stilbius, Protomyctophum crockeri) characterized ‘normal’ years (mid‐1984 to mid‐1987).