再生稻产3.75t／hm^2栽培技术“规范”中试效果及其分析

１９９２～１９９５年课题组进行了“再生稻产３．７５ｔ／ｈｍ２栽培技术“规范”（以下简称“规范”）中间示范试验（简称中试）,累计面积９７７．８３ｈｍ２;头季稻平均单产８．５５ｔ／ｈｍ２,再生稻３．６７ｔ／ｈｍ２,比同地区示范前的１９９１年头季７．６５ｔ／ｈｍ２,再生稻２．２８ｔ／ｈｍ２分别增产０．９０和１．３９ｔ／ｈｍ２,两季增产２．２９ｔ／ｈｍ２。其中再生稻验收的最高单产达５．２１ｔ／ｈｍ２,两季总产１３．０３ｔ／ｈｍ２。对比试验结果,“规范”较原再生稻产２．２５ｔ／ｈｍ２栽培“模式”（以下简称“模式”）头季稻和再生稻分别增加０．６６和０．９４ｔ／ｈｍ２。说明“规范”是一套更先进的高产栽培技术。     

硝酸还原酶的研究——Ⅴ.棉花硝酸还原酶活力与硝态氮含量的关系

棉花中的酚类物质对硝酸还原酶(NR)活力的体外测定有强烈抑制作用。用含半胱氨酸(5mM)和乙二胺四乙酸二钠(5mM)的磷酸缓冲液提取测不出酶活。如在磷酸缓冲液中加入酚类物质的抑制剂—聚乙烯吡咯烷酮(PVP),酶活力则显著增高。运用此法,本文在盆栽的情况下研究了棉花 NR 活力和硝态氮含量的关系。结果表明在不同棉花品种中、不     

免疫球蛋白G(IgG)三种提取方法比较

比较3种提取猪血清中免疫球蛋白IgG方法的提取效果。分别用辛酸沉淀法,硫酸铵分步沉淀法,辛酸-硫酸铵沉淀法粗提猪血清免疫球蛋白IgG,并通过SDS-PAGE凝胶电泳、AlphaEaseFC凝胶成像分析软件、Bradford蛋白浓度测定法等比较3种方法的提取纯度和得率,同时比较3种方法的时效性和经济性。辛酸沉淀法提取IgG所用时间最短,只需1h,得率较高但纯度不高;硫酸铵盐析法提取的IgG纯度较高、得率也高,但时间较长;辛酸-硫酸铵分步沉淀法所得IgG纯度很高,但所用时间较长,得率也较低。3种提取方法各有特点,可根据不同的实验条件和目的选择不同的提取方法。     

二化螟性诱剂和诱盆设置技术的研究

通过对二化螟性诱剂水盆诱捕器及其设置高度比较研究,结果表明：诱捕器的口径大小以２４ｃｍ为佳,绿色水盆的诱蛾量比其他颜色的要大;在越冬代诱捕中,诱盆的高度在２０ｃｍ左右效果较好;性诱剂离水面的高度对二化螟雄蛾的诱捕有一定影响,其高度在０.５～１.０ｃｍ的诱蛾量最高。     

辐照柑桔和板栗害虫的研究

本文对检疫害虫柑桔大实蝇和栗象的辐照处理了研究。     

Seasonal shoot and needle growth of loblolly pine responds to thinning, fertilization, and crown position

The impacts of thinning, fertilization and crown position on seasonal growth of current-year shoots and foliage were studied in a 13-year-old loblolly pine (Pinus taeda L.) plantation in the sixth post-treatment year (1994). Length of new flushes, and their needle length, leaf area, and oven-dry weight were measured in the upper and lower crown from March through November. Total shoot length was the cumulative length of all flushes on a given shoot and total leaf area per shoot was the sum of leaf areas of the flushes.

By the end of June, first-flush foliage reached 70% of the November needle length (14.3 cm) and 65% of the final leaf area (15.0 cm²). Cumulative shoot length of first- and second-flush shoots achieved 95% of the annual length (30.3 cm), whereas total leaf area per shoot was 55% of the final value (75.3 dm²). Fertilization consistently stimulated fascicle needle length, dry weight, and leaf area in the upper crown. Mean leaf area of upper-crown shoots was increased by 64% six years after fertilization. A significant thinning effect was found to decrease mean leaf area per shoot in the crown. For most of the growing season, the thinned-fertilized trees produced substantially more leaf area per shoot throughout the crown than the thinned-nonfertilized trees. These thinned-fertilized trees also had greater needle length and dry weight, longer first flush shoots, and more leaf area per flush than trees in the thinned-nonfertilized plots. Needle length and leaf area of first flush shoots between April and July were linearly related to previous-month canopy air temperature (T_a). Total shoot length strongly depended on vertical light gradient (PPFD) within the canopy, whereas shoot leaf area was a function of both PPFD and T_a. Thus, trees produced larger and heavier fascicles, more and longer flush shoots, and more leaf area per shoot in the upper crown than the lower crown. We conclude that thinning, fertilization, and crown position regulate annual leaf area production of current-year shoots largely by affecting the expansion of first flush shoots and their foliage during the first half of the growing season.     

南方地区杨树胶合板材定向培育技术的研究

随着工业技术的发展,工业生产对木材和其它林产品提出了更高、更新的要求,要求各类用材实行定向培育,这是世界人工林发展出现的战略变化１）。杨树具有生长快、成材早、产量高和易于更新的特点,为最适的短轮伐期工业用材林经营树种（方升佐等,１９９３）。所谓定向培育,是指按最终用途所确定的对木材原料的要求,采用集约经营等科学管理措施,生产出种类、质量、规格都大致相同,价格具竞争力的大批木材原料。本文简要总结了南方地区杨树胶合板材定向培育技术中关于无性系选择、立地控制、密度控制、栽植材料选择及优化栽培模式等研究…     

浸渍纸饰面层压木质地板质量现状分析

本文通过「近百个浸渍纸饰面层压木质地板的检测数据,分析了目前国内市场上该产品的２和发展,为标准制订提供限依据。     

用瞬时转速法估算压缩压力的探讨

在分析了反拖工况下曲轴受各力矩的变化规律曲柄转角与瞬时转速之间的相位关系的基础对用瞬时转速法估算柴油机压缩压力进行了探讨,给出了一种用曲轴的瞬时转速数据估算各缸压力的实用方法,在一台四缸直喷式柴油机上的试验结果表明,用该方法由飞轮的瞬时转速检测气缸的最高压缩压力,其标准误差不超过０．０３ＭＰａ,所提出的方法可用于柴油机的监测诊断系统中。     

斗轮堆取料机变幅试验装置的动态特性

根据ＤＱ１０００／１５００．４５型斗轮堆取料机变幅设计制造了变幅试验装置,建立了三维梁元有限元模型,借助于有发元分析软件,利用子空间迭代法对模型进行了求解,得到其大有频率及相应的振型,对试验装置的动态特性进行了试验研究,测试结果验证了有限元建模和计算方法的正确性。