安顺市环城林带绿化设计方案初步分析

阐述了安顺市环城林带绿化建设工程的绿化设计方案,对设计方案中的立地类型划分、树种选择、造林类型及混交设计、造林密度和配置方式等进行了初步分析,并对后期管理提出建议。     

Determinism of the induction of the reproductive cycle in female Eurasian perch, Perca fluviatilis: Identification of environmental cues and permissive factors

In Eurasian perch, Perca fluviatilis, gametogenesis is induced by decrease of both temperature and photoperiod. However, a multiplicity of other factors can display non-permissive or modulating effects on the induction of the reproductive cycle. Consequently, a 9-week study was carried out to determine the environmental cues and permissive factors controlling the induction of the reproductive cycle in this species. A two-level fractional factorial design 2^8-4 was used in order to identify the influent factors from 8 environmental and nutritional ones and their 28 interactions. Tested factors were: (1) amplitude of temperature decrease, (2) time, (3) kinetics and (4) amplitude of photoperiod decrease, (5) initial nutritional state, (6) handling, (7) feeding rate and (8) light spectrum. Increase of gonadosomatic index (GSIi), proportion of female in exogenous vitellogenesis (EVP), plasma 17 β-estradiol (E₂) and cortisol levels, fat consumption and food intake were evaluated.This study showed that the amplitude of the decrease of temperature and the time of photoperiod decrease are the two main environmental cues controlling the induction of the reproductive cycle in Eurasian perch. GSIi was the highest (3.8%) when females were exposed to both low amplitude of temperature decrease and precocious decrease of photophase. It was the lowest (1.1%) when high amplitude of temperature decrease and late decrease of photophase were applied. Handling in association with temperature modulated the broodstock response. 100% of the unhandled fish held at 14 °C were at the exogenous vitellogenesis stage with mean E₂ and basal cortisol levels of 1.6 ng mL^− 1 and 9 ng mL^− 1 respectively. Handled fish and fish held at 6 °C exhibited lower vitellogenesis (40-73%) associated with lower E₂ (0.6-1.1 ng mL^− 1) and higher basal cortisol levels (37-89 ng mL^− 1). No other factor nor interaction displayed a cueing or non permissive effect on the induction of the reproductive cycle in female Eurasian perch. A first schematic model is proposed to explain the factorial determinism of the induction of the reproductive cycle.     

国外封闭循环水养殖系统工艺流程设计现状与展望

以发达国家成功运行的养殖系统为出发点,按照不同养殖鱼类的生活习性、水体流态以及水处理工艺特性的不同,将其归类为4种典型鱼类的循环水养殖系统工艺(常规游泳性鱼类、鲆鲽类、鲑鳟类、鳗鲡等),分析探讨每种工艺的设计理念、设计思路等,总结工艺流程设计技术特征,展望未来发展趋势,提出循环水养殖工艺流程设计较为特殊的3种模式,从而为封闭循环水养殖系统设计提供技术参考。     

多花梾木种子发芽特性研究

[目的]研究多花株木种子的发芽特性.[方法]采用正交试验设计,研究在不同温度、不同酸蚀时间、不同GA3浸种浓度对种子发芽率的影响.[结果]温度对种子发芽影响较明显,在5℃低温处理下时长100 d发芽率最好,达72％.[结论]低温处理在一定条件下能提高多花株木种子的萌发能力.     

几个适制扁茶的无性系茶树品种引种试验

对几个适制扁茶的无性系茶树品种在青岛地区进行了引种比较试验,经过综合评价,认为龙井43、浙农139比较适合在北方茶区露地栽培,平阳特早发芽最早,适合在大棚种植。     

Design,construction and erection of seawater intake system to establish a biofouling test facility

Large amount of seawater is used in coastal industries, like power generating plants, desalination plants and aquatic culture farms. A similar requirement exists in Department of Atomic Energy campus at Kalpakkam, Tamil Nadu, India. Seawater in large quantities is required for its nuclear power stations and desalination plants erected on the east coast of Bay of Bengal situated in southern part of India. Such seawater systems have biofouling problems. Hence a seawater intake system has been designed, constructed and erected so that virgin seawater will be available for biofouling studies that was proposed to be carried in a once through flow test facility. A major criterion for the test facility was that continuous supply of seawater should be available at the rate of 160 m³/h. To meet this requirement, centrifugal pumps were installed at about 150 m away from the shoreline and connected to an intake structure using 600 m long, 355 mm OD, high density polyethylene pipeline laid on the seabed. Details of site selection, options of construction methods, materials selection, pressure drop calculations, sizing of pipes and anchor blocks, stability of intake pipeline, deployment criteria and project cost and planning have been discussed in this paper.     

2008年国家甜菜品种区域试验品种稳定性测定

通过对2008年国家甜菜品种区域试验结果的统计分析,求得品种×地点互作效应值（AU）ij、变异系数（iCKvu）．并据此对参试品种进行了稳定性测定和适应性分析。结果表明：品种ZM202、ND41、CH9301、H10466、H10474、XJT9902表现出了较好的稳定性,有广泛的适应性。品种Bern6872、KWS3148、KWS4125、H10466、H10474的产糖量水平较高．在生产中有较大的使用价值。品种D03169、2005-21的含糖率水平较高,并且具有很好的稳定性,在需要高糖品种的地区,可优先加以利用。     

湛江市园林水景的水生植物配置现状及分析

通过对湛江市几个滨水绿地的实地调查,详细研究了湛江市主要园林水景中水生植物的主要形态特性及其在园林中的应用,并讨论了其应用现状及存在的不足。     

A comparative molecular field analysis study of obtusifoliol 14α-methyl demethylase inhibitors

This report describes the development of a Comparative Molecular Field Analysis (CoMFA) model from a set of obtusifoliol 14α-methyl demethylase (DM) inhibitors to aid in the design of herbicides targeting sterol biosynthesis. CoMFA is a three-dimensional (3-D) quantitative structure–activity relationship (QSAR) method that is useful in the probing of receptor binding sites when experimental structure data are unavailable. Conformational analysis and SAR of some rigid and active analogs were used to build the initial model using the active analog hypothesis. The model was subsequently used to design compounds that retain the active site shape requirements, but incorporate physical properties that favor soil-applied herbicidal action. In addition, a second-generation CoMFA model incorporating the newly designed inhibitors was developed and represents the current understanding of the DM binding site. This model was derived from a pharmacophore developed from two methods, the active analog approach as well as from the Catalyst program. The fact that two independent methods produced a similar pharmacophore strengthens the validity of the model. © 1999 Society of Chemical Industry     

夏大豆高产栽培技术的正交试验研究

采用正交试验设计,研究了品种类型、密度、种植方式三因素对大豆产量的影响.结果表明:品种是夏大豆产量及各农艺性状的主要影响因素;三因素对夏大豆产量影响强度的顺序是品种>密度>种植方式;在本区生态条件下,获得夏大豆最高产量的理论组合为:品种为有限类型沧豆6号、密度1.6万株/667 m2、种植方式为40 cm行距.