东北珍贵药材--北五味子的丰产栽培技术

本文从园址的选择到园地管理及病虫害防治等方面，详细论述了北五味子的人工栽培技术。     

中华鳖的消化道指数和血液生化指标

主要测定了中华鳖的消化道指数及血液中几种重要酶的活性,并将胃、肠、胰重与体重进行回归分析。结果表明:消化道的重量随体重同步变化,回归分析表明二者的幂回归相关系数最高。中华鳖的乳酸脱氢酶、肌酸激酶、碱性磷酸酶、谷-草转氨酶和谷-丙转氨酶的活性分别是人上限值的3.4、11.2、4.8、6.6和2.4倍,且谷-草转氨酶、谷-丙转氨酶和碱性磷酸酶的活性两两正相关。     

蜜蜂卵黄发生及激素调控概述

综述了蜜蜂卵黄发生的过程及其激素调控的研究进展 ,其中主要介绍了关于保幼激素和蜕皮激素的调控作用 ,并就这方面的研究进行了展望     

西施舌幼贝滤食与生长的初步研究

2000年8月～2001年7月,在长乐市海蚌研究开发中心对西施舌[Coelomactra antiquata(Spengler)]幼贝的摄食与生长进行了研究。结果表明,西施舌幼贝昼夜滤食有一定节律,白天滤食率略低于夜晚。平均体长24.7～42.6cm的幼贝对扁藻(Playmonos SPP)的滤食量分别为10.55×104～31.94×104cell/(h·个),其6h滤食率为11.42～22.38％。用单细胞藻类为饵料进行人工饲育,满一龄的西施舌体长30.2～51.0mm,体重3.8～21.4g,不同个体间生长差异显著。体重、体宽与体长的直线回归关系为:We=0.91+0.12L,We=0.78+14L。     

不同质量浓度二氧化氯对三种河蟹致病菌的杀灭效果

以1％的Na2S2O3为中和剂，测定了五种质量浓度100，20，4，0．8，0．16mg/L ClO2溶液对副溶血弧菌、毛霉亮发菌以及嗜水气单胞菌等河蟹致病菌的杀灭效果。同时以蛋白胨质量为材料测定了有机物对ClO2杀菌效果的影响。结果表明：0．8mg/L的ClO2作用15min、0．16mg/L的ClO2作用30min可有效杀灭三种致病菌；蛋白胨浓度为25mg/L时，对ClO2的杀菌效果几乎没有影响，蛋白胨质量浓度为25mg/L时，ClO2作用15min的杀菌率下降为97．5％，蛋白胨质量浓度为625mg/L时下降为95．5％。     

蚕蛹虫草与冬虫夏草中无机元素的比较

样品硝化液用荧光、极谱和ICP等方法测定结果表明:人工蛹草与天然虫草无机元素种类基本一致,含量十分丰富;蛹草比虫草,所测30种元素加和量及其人体必需宏量无素含量和皆高,必需微量元素含量和则低,而有害微量元素含量和相近,但都低于致毒量。     

茶籽的超低温(-196℃)贮藏

试验研究了超低温贮存顽拗型(RecaIcitrant)种子茶籽的技术,结果表明,采用铝箔/薄膜复合袋密封包装,将含水量8％至13.83％的种子直接快速投入液氮,35℃温水解冻方式,能保持生活力,最适含水量为13.83％,经118天贮存后发芽率93.3％,且均成苗,液氮贮存后的最适发芽方法是在5％水分(W/W)沙床中于5±1℃预吸处理15天,然后移至25℃发芽,预处理后的种子,细胞膜修复能力增强,渗漏物减少,发芽率提高。     

Size-related habitat use by bitterling (Rhodeus sericeus) in a regulated lowland river

Abstract  – Habitat use by four size-classes of bitterling ( Rhodeus sericeus ) in a regulated lowland river was studied at two spatial scales. Mesohabitat scale was represented by the bank type (boulder, beach and steep eroded bank). Microhabitat associations with substrate types, vegetation, woody debris and position in the stream were examined at each mesohabitat scale. Three size cohorts of young-of-the-year (0+) fish and a group of adult bitterling were detected. Univariate ( χ ²-tests) and multivariate (Outlying Mean Index analysis) methods were applied to determine size-related habitat associations. All the size-classes of bitterling avoided the steep eroded bank and most 0+ bitterling were distributed along the boulder bank. The smallest fish had the most pronounced habitat requirements and occurred mostly in the depositional areas, whereas the larger 0+ fish occurred in deeper water. The size-related change in the habitat use coincided with a change in diet and morphological state.     

祁连山南麓中国沙棘主要林分类型的森林水文作用

中国沙棘 青海云杉和中国沙棘 华北落叶松混交林的最大截留量、枯落物持水量和稳渗速度明显高于其纯林。17年生华北落叶松 中国沙棘林最大截留量较华北落叶松纯林高23．9％，枯落物持水量高26．3％，稳渗速度高2．4倍。退耕地所有中国沙棘林分最大截留量分布范围为1．43～2．02mm，较农作物高O．80～1．41mm，也高于退耕地种草、种药的O．23～O．43mm；退耕还林地表形成稳定的枯落物层，退耕栽植沙棘林枯落物层持水量较农作物十分明显；中国沙棘林地土壤的稳渗速度较农耕地的高5．5～19．5倍。退耕还林还草后，中国沙棘等人工植物群落较农作物的森林水文生态功能明显得到提高。     

Remobilization of Phosphorus in Tea Plants

Tea [Camellia sinensis (L.) O. Kuntze] is a highly phosphorus (P) deficiency-tolerant species, however, involving mechanisms have not been investigated so far. In this work, mechanisms for intrinsic efficiency of P utilization were studied in tea seedlings grown hydroponically without or with adequate P supply. The contribution of P reserve in cotyledons to the P nutrition of tea seedlings and the role of mature leaves were examined at two contrasting P supply levels in plants with intact or severed cotyledons. During three subsequent harvest intervals, distinct reduction of P content was observed not only in cotyledons, but also in the mature leaves, stem and roots of plants supplied with low P. In plants supplied adequately with P, in contrast, a continuous rise of P content was detected. It was concluded that the cotyledons of tea plants are a major source of P but not organic compounds for growth of the young seedlings.