山西省优势农产品——“苹果”竞争策略

山西苹果产业在山西农业中已占有非常重要的地位，山西苹果产业具有良好的发展条件、广阔的市场前景和得天独厚的竞争优势，在激烈的市场竞争中，山西苹果产业应针对自身存在的主要问题，采取一系列科学、合理的竞争策略，努力做强、做大。     

绿洲农区不同苜蓿品种(系)主要性状的研究

在绿洲农区对17个不同品种（系）苜蓿的4个主要性状产量、再生性、粗蛋白含量及抗寒性等方面进行了研究。几项指标综合反映,美国8920、三得利、WL-232、先驱者、爱博等品种在绿洲农区的表现优于其他品种。     

太阳能鱼池的研究(Ⅰ)——太阳能鱼池的设计

本文介绍了一座50m~2被动太阳能鱼池的建筑设计。该太阳能鱼池采用热水器和集热器组合采暖.显热贮热(水)和潜热贮热(水合硫酸钠)结合。贮热主要技术指标:自10月至次年4月鱼池水温保持在15—20C°;太阳能保证率75%左右.该鱼池经济上合理,技术上可行.     

好氧颗粒污泥膜生物反应器处理畜禽废水

采用好氧颗粒污泥膜生物反应器处理畜禽废水，分别对COD、NH4^＋-N、NO2^--N、NO3^--N的去除效果和对膜通量的影响进行了研究。结果表明：在水力停留时间（HRT）为8h，进水COD浓度为600mg／L，NH4^＋-N浓度为40mg／L的条件下，出水COD、NH4^＋-N的浓度分别为46．6和4．8mg／L。NO2^--N和NO3^--N的去除率也可达90％以上。并且好氧颗粒污泥的加入减缓了膜的污染。     

Monitoring the Cultivated Slope Land in the Three Gorges Reservoir Area Based on Remote Sensing and GIS

0IntroductionCultivatedlandis the basis for human survivaland development.Its composition,change,and sustainable use are undoubtedly i mportant fac-tors havingi mpact onthe sustainable development ofan area.There are high mountains andsteepslopes,alarge population andlittle cultivatedlandin ThreeGorges Reservoir Area.The Geographic distributionof cultivated land is extremely unreasonable,andcultivatable land resources are li mited.With poorwater resource facilities,weak disaster resistancea…     

中国海水鱼类核型研究概述

染色体是遗传物质的载体，是细胞中最重要的结构．研究染色体的形态和结构．有助于了解生物的遗传组成、遗传变异规律和发育机制，而且对预测种间杂交和多倍体育种的结果、了解性别遗传机理以及基因组数、物种起源、进化和种族关系的鉴定都有重要的参考价值．我国从上世纪70年代初开始淡水鱼类染色体的研究．海水鱼类染色体的研究相对较晚，1987年才见到海水鱼染色体研究的相关报道，至今近20年中，已经对7目24科76种海产鱼类的核型进行了研究，约占我国近3100种海水鱼类的2．4％．本文简要概述了近20年来我国海水鱼类染色体核型的研究状况．包括研究种类．采用的研究方法．并对我国海水鱼类核型研究中存在的问题进行探讨．     

松山自然保护区鱼类调查报告

1987～1989年对北京松山自然保护区的鱼类进行了调查,结果表明共有12种。其中洛氏(鱼岁)、张氏(鱼岁)、赛丽高原鳅和达里高原鳅为北京地区新记录。     

广东海产鱼类两种复殖吸虫包括一新种的记述

本文记述发现于广东阳江黄斑蓝子鱼肠道的广东寡腺吸虫,新种Ｏｌｉｇｏｌｅｃｉｔｈｏｉｄｅｓ ｇｕａｎｇｄｏｎｇｅｎｓｉｓ ｓ．ｎｏｖ．及日本金线鱼肠道的中长单肠吸虫Ｍｏｎａｓｃｕｓ ｍｅｄｉｓｏｌｏｎｇｉｕｓｃｕｌｕｓ Ｄｉｎｇ,１９９３。新种前列腺膨大呈囊状,肠前部不膨大成结,食道短,体形梭形等特征与已知知种明显不同,日本金线鱼为中长单肠吸虫Ｍｏｎａｓｃｕｓ ｍｅｄｉｏｎｇｉｕｓｃｕｌｕｓ Ｄｉｎ     

Chondracanthid copepods (Poecilostomatoida) parasitic on Japanese deep-sea fishes,with a key to the genera of the Chondracanthidae

Four species of chondracanthid copepods are reported from grenadier fishes (Macrouridae) taken in the deep waters off Japan. They are Chondracanthus neali Leigh-Sharpe, 1930 from the oral cavity floor of Malacocephalus nippoensis Gilbert et Hubbs; Chondracanthodes deflexus Wilson, 1932 from the gill cover of Coryphaenoides armatus (Hector); Jusheyhoea ryukyuensis sp. nov. from the oral cavity wall of Coelorhynchus anatirostris Jordan et Gilbert, C. gilberti Jordan et Hubbs and C. productus Gilbert et Hubbs; and Chelonichondria okamurai gen. et sp. nov. from the gill cover of Coryphaenoides nasutus Günther. A key to the 42 genera of the Chondracanthidae is provided.     

Occurrence and assessment of veterinary antibiotics in swine manures: A case study in East China

We investigated the occurrence of 14 selected antibiotics including five therapeutic classes of tetracyclines,sulfonamides,macrolides,fluoroquinolones and chloramphenicols in manures collected from four swine farms of different sizes in eastern China.Tetracyclines(tetracycline,oxytetracycline,chlortetracycline,and doxycycline) and sulfadiazine were the most prominent contaminants in the manure samples,with maximum concentrations reaching 98.2 × 10 3,354.0 × 10 3,139.4 × 10 3,37.2× 10 3,and 7.1× 10 3 μg/kg,respectively.The occurrence of these compounds was dependent on breeding scale,animal type,and breeding season.Manure storage and vermiculture were not able to effectively deplete the heavier contaminants(tetracyclines and sulfadiazine),resulting in high levels of these chemicals remaining in manures.Therefore,the occurrence of these antibiotics in agricultural soils(0.1-205.1 μg/kg) collected from four types of agricultural land(pear orchard,tea plantation,bamboo forest,and paddy field) near the studied farms,was a reflection of manure application.However,the extremely high concentrations of antibiotics in manures were unlikely from feed consumption,but from other direct forms of medicine application.