20世纪以来文学中乡土想像的文化机制

乡土想像在20世纪以来成为作家最热衷表现的对象之一，这是中国传统文化基因与现代性的历史机遇而形成的文化机制造成的。是乡土无意识与现代性历史机缘之下重新激发出来的一种文化心理，是知识分子在现代化进程中对于传统文化的补偿与救赎心理使然，是传统文化与现代文明相冲突的结果。     

Existence of salt glands on leaves of kallar grass (Leptochloa fusca L. Kunth.)

Light microscopic studies have established the existence of salt glands on “Kallar grass”; leaf blades. The salt glands resembled the two‐cell type structure described for some halophytic genera within the Gramineae. The secreted salts crystallized and formed whiskers when the plants were grown under continuously high saline conditions. The salt secretion appears to be selective. The secretion of Na exceeded that of K and considerable quantities of Cl were also extruded, preferentially in concomitance with Na. The significance of growth hormones and Ca in regulating the salt secretion process is discussed.     

Effects of Clear Polymer Film on Emergence and Survival of Direct Sown Native Vegetation

Clear, degradable polymer films are used with agricultural crops to alter the germination and growing environment and extend the length of the growing season. The film acts like a greenhouse, elevating temperatures and improving soil water. We examined the potential of polymer film to improve emergence and persistence of direct‐seeded native vegetation. A seed mix comprising three tree species and two shrubs was sown in early August 2015, with and without polymer film. The effect of duration of polymer film (from 0–10 weeks) on emergence and persistence was tested, and the effects of polymer film on temperature and soil moisture were monitored. Our hypothesis that polymer film would improve emergence was partially supported, with between 6 and 10 weeks of polymer film coverage increasing emergence of small‐seeded species above the level of the Control. The polymer film increased temperatures by an average of 5 °C and volumetric water content by up to 10%, compared with ambient conditions, and reduced fluctuations in soil moisture, which may have contributed to the increased emergence observed. Emergence was low across all treatments (range 0·2–47%). Our hypothesis that polymer film would improve persistence was not supported, with seedling numbers declining rapidly following removal of the polymer film and no differences between treatments in percentage persistence by the end of the experiment. We concluded that polymer film is a potentially useful tool for improving emergence of smaller‐seeded species in direct seeding for land restoration, although provided no benefit for emergence of the larger‐seeded species. Copyright © 2017 John Wiley & Sons, Ltd.     

西部农村发展奶牛小区的优势及注意问题

西部农村饲草资源充裕,发展奶牛养殖小区有利于减少草料运输费用,有利于减轻城郊养牛环境污染,有利于改善牛奶质量。本文提出小区建设应注意的五个问题:注重奶牛质量;采用胚胎移植技术,提高小区牛群的个体产奶量:种养结合,建立与奶牛养殖业配套的饲草生产基地;改进饲养管理,推行混合日粮饲养技术;实行行业准入制度,控制小区环境污染,提高牛奶质量,生产绿色奶品。     

仁寿县种草养畜生产现状调查报告

仁寿县 (四川农区种草养畜生产发展的重点县 )种草养羊、养牛、养兔、养鹅、养猪发展变化很大 ,是耗粮型畜牧业向节粮型畜牧业转变的典型代表。要加强搞好草畜配套 ,以畜定草工作。大力发展牧草品种、数量和种植面积。     

气象条件与垂穗披碱草再生性关系的研究

利用河南县牧气观测资料 ,根据垂穗披碱草的生物学特性 ,探讨牧草的再生能力与积温、草原干湿指数、产草量的关系 ,可作为科学利用草场 ,合理轮牧的依据。     

Allelopathic Effect of Eucalyptus globulus Labill. on Cyperus rotundus L. and Cynodon dactylon L. Pers.

The allelopathic potential of Eucalyptus globulus Labill. (gum tree) fresh and dried leaf leachates was studied using two perennial weeds, viz. purple nutsedge (Cyperus rotundus L.) and bermuda grass (Cynodon dactylon L. Pers) as test weeds. Aqueous leachate of fresh leaves of eucalyptus significantly suppressed the establishment of vegetative propagules and early seedling growth of the weeds. Leachate of fresh leaf cuttings had growth inhibitory effect on bermuda grass but showed growth promotion effect on purple nutsedge. Similarly the leachate of dried leaves of eucalyptus had differential influence on the growth of the two weeds. There is a possibility to harness the allelochemicals of eucalyptus leaves as herbicides for the management of these perennial weeds.     

对退耕还林工程中种草的探讨

分析种草在退耕还林工程中的重要地位和作用 ,提出退耕种草的草种选择和种植模式 ,并探讨发展草产业的途径和方向     

南方低丘生态脆弱区退耕还林(草)的思考

我国南方低丘山区降雨量大，水土流失也很严重。针对南方生态脆弱区坡耕地的特征，分析了退耕还林（草）的必要性；提出了退耕还林要加强党的政策宣传，走群众路线，加大科技投入，实施科技兴林战略，实施生态移民与旅游开发相结合的对策，并阐述了在南方生态脆弱区实施退耕还林（草）工程需要注意的几个问题。     

“鱼健宝”中药配方的筛选及防治草鱼“三病”的试验

经过对近百味中草药的筛选,优化组合配制了针对草鱼“三病”(菌性肠炎、烂鳃、赤皮病)有明显疗效的4号复方组方——我们命名为鱼健宝；并对各组方剂、疗效、药理分别进行了体外抑菌试验,草鱼“三病”的临床防治试验。结果显示,本试验4号复方“鱼健宝”对草鱼“三病”病原菌的体外抑菌效果明显；草鱼“三病”的临床防治试验表明,4个组方的中草药对预防草鱼“三病”都有较好的效果,其中以方4“鱼健宝”的防治效果最好。