迎县庆 跨世纪 展辉煌——回眸江华50年林业发展成就

江华瑶族自治县是我国南方重点产材县和湖南省重点林区县,素有“杉木之乡”美称,是全国瑶族人口聚居最多的县。值此隆重庆祝江华瑶族自治县成立 45周年之际,我们站在世纪之交回顾我县 50年来林业发展的辉煌成就。 　　解放初期,县政府实行了“谁造谁有”的政策,并对植树造林给予经济和粮食补贴。六十年代,我县以社队集体林场为依托,建设丰产林基地,集体林场发展到 132个。党的十一届三中全会以来,我县先后进行了“林业三定”、“分户经营”、“统分结合的双层经营”等林业生产责任制的改革探索和稳定完善,极大地调动了林农的生产…     

坚持五年封造攻坚战 力争十年实现森林化

我县是全国重点林区县 ,地处潇水发源地和珠江流域发源地 ,现有林地２３ ８万公顷 ,占全县总面积的７１ %。１９９３年全县实现绿化达标后 ,对“难造、难活、难管”石灰岩山地 ,大搞封山造林 ,几年来坚持不懈 ,目前已取得较好的成效。全县１ ６３万公顷石灰岩山地 ,已有０ ４万公顷实现了绿化 ,尤其是去年来对２０７国道和１８６１省道沿线３公里内的０ ４８万公顷石灰岩山地 ,实行工程封山造林攻坚措施 ,加快了全县森林化步伐。我们还要进一步提高认识 ,统一思想 ,今年起 ,下决心５年完成“三难地”封造任务 ,１０年实现全县森林化目标 ,为…     

禽流感病毒HA基因核酸疫苗脂质体制备方法的研究

用逆相法、冷冻溶融法、冻干法、脂膜法制得了禽流感病毒血凝素(HA)基因重组质粒pSVH7DNA(核酸疫苗)脂质体;用荧光法测得脂质体的包封率分别为(15.58士1.55)％,(14.7土0.79)％,(11.43士1.76)％,(6.08士0.35)％,当在磷脂成分中加入阳离子脂时,脂质体的包封率分别为(70.41士6.49)％,(57.58士0.88)％,(53.72士9.07)％和(46.56士1.92)％。电镜观察发现四种方法所得的脂质体为单室和多室球形脂体混合物,其粒径大小分别为163nm,189nm,138nm和235nm,结果表明逆相法、冻干法、冷冻溶融法为制备脂质体的有效方法。     

不同光照处理下外施营养液和激素对万圣节法师叶色变化的影响[1]

To study the effects of light, external nutrition, and hormones on the color changes of Aeonium aeonium "Halloween" leaves. In this study, the 1-year-old stem cuttings of the Aeonium aeonium "Halloween" were used as materials. The leaves were sprayed with 25mg/L methyl jasmonic acid, 3‰ potassium dihydrogen phosphate, and 1‰ calcium magnesium boron mixture for two consecutive times, with an interval of 3 days. The experiment consisted of CK (water control), LS, DS (dark culture for 1 week). After 1 week of treatment, the leaf color parameters and anthocyanin pigment content were measured every 7 days for 6 consecutive weeks. The results showed that the treatment time and method had a significant impact on the leaf color parameters. In terms of brightness value L, as the treatment time extended, all three treatments showed an upward downward upward trend. Among them, the highest value was reached after 2 weeks of treatment, gradually decreased after 3 weeks, and sharply increased again after 6 weeks; In terms of red green saturation a value, after 2-4 weeks of treatment, both LS and DS treatments were significantly higher than CK, and the effect significantly decreased after 5 weeks; Light has a significant impact on a value, with DS treatment showing a significant decrease in a value after one week of shading, and a sharp increase after re lighting; In terms of the b value of yellow and blue saturation, the change in CK value is relatively small with the extension of treatment time, while the fluctuation in LS and DS treatment is significant; In terms of color saturation c value, DS treatment significantly increased with the prolongation of treatment time, and there was no significant change in LS and CK treatment within 1-3 weeks. After 3 weeks of treatment, there was no significant difference between the three treatments; With the extension of treatment time, the anthocyanin content of each treatment showed a trend of first increasing and then decreasing. After 2-3 weeks of treatment, the anthocyanin content was higher, and gradually decreased after 4 weeks of treatment; Correlation analysis shows that anthocyanin content is highly significantly positively correlated with a and c values, and anthocyanin content is a key factor in the red color of Aeonium aeonium "Halloween".     

我国相对贫困问题研究现状与展望

2020年我国消除绝对贫困任务完成以后,贫困现象的主要表现将成为相对贫困.以农村地区为主的相对贫困治理将成为未来我国反贫困工作的重心,也是当前学术界研究的焦点问题.我国学术界已围绕相对贫困的内涵、成因、标准设定以及治理机制等问题展开了研究,但尚未形成系统性的理论体系.文中通过梳理现有研究成果,分析当前研究的不足,提出未...     

新型饲料药物添加剂喹烯酮一般毒性研究——Ⅱ.蓄积毒性试验

依据20天蓄积毒性试验法设计,通过对小白鼠口服喹烯酮进行了蓄积毒性试验。试验结果表明0、1/20、1/10和1/5 LD_(50)小白鼠都没有死亡,1/2 LD_(50)小白鼠死亡15只,存活15只,依据判定标准,证明喹烯酮对小白鼠无明显的蓄积毒性作用。     

新疆塔里木河下游垦区应用绵羊冷冻精液效果的分析

<正> 材料与方法一、试验设计与试验时间本试验于1980年8月17日～9月3日在农二师35团进行。选用该团12连和5连的3群混合年龄繁殖母羊共620只,全部为新疆细毛羊杂种。试验开始前,将3群母羊逐一编号、称重,然后用完全随机设计按母羊体重顺序将其分为2组。对照组用一般常规人工授精。母羊发情后,分组配种,并详细记载。一经输精,母羊分别计入2组总数。     

论农业贷款的宏观决策

我们国家为了平衡信贷收支,稳定货币流通,1983年下半年以来,采取了紧缩银根、控制贷款规模、减少货币发行的决策。这是从宏观上考虑国民经济的全局需要,无疑是正确的。但1984年农业贷款要紧缩到什么程度?怎样实施这个决策?应做具体分析研究。     

MC—Ⅰ药骟注射液在牛体上的应用

用 MC-Ⅰ药骟注射液睾丸内注射,在陕西、青海、甘肃、内蒙古等省区药骟公牛714头,其中黄牛437头,牦牛277头。注射药量主要取决于睾丸体积的大小,体重75～100kg 的1岁公牦牛,睾丸长3～6cm,每睾注射药量1～3.5ml;体重在100～120kg 的2～3岁公牦牛,睾丸长6～8cm,每睾注射药量3～5ml;体重在100～150kg 半岁以内的公黄牛,睾丸长约7cm,每睾注射药量5～6ml。试验结果表明,1岁以内的公牦牛去势有效率为100%; 2～3岁的公牦牛去势有效率为90%。437头公黄牛中去势成功392头,成功率为89.7%,无效11头,有效34头,去势有效率达97.5%。3月龄以内的黄牛,去势有效率达100%,随着年龄和体重的增大,有效率有所降低。本法具有安全、有效、价廉等优点。