苦楝苗期生长规律及风口造林初报     

吴柳清 《防护林科技》2017,(7)

通过对苦楝苗木生长过程进行实地观测,同时应用系统聚类分析,将苦楝苗木生长划分为出苗期(60d)、生长初期(60d)、生长盛期(60d)和生长末期(90d)等4个时期。风口造林试验表明,苦楝与木麻黄混交造林方式最好,4年生时平均树高1.5m,保存率达85.6%。苦楝在风口造林的成功不仅能提高沿海造林树种的多样性,对防治林业有害生物也起到积极作用。  相似文献   

Old and New Cultivars of Soya Bean (Glycine max L.) Subjected to Soil Drying Differ in Abscisic Acid Accumulation,Water Relations Characteristics and Yield          下载免费PDF全文

J. He  Y.‐L. Du  T. Wang  N. C. Turner  Y. Xi  F.‐M. Li 《Journal of Agronomy and Crop Science》2016,202(5):372-383

Two old (Huangsedadou and Longxixiaohuangpi (LX)) and two new (Jindou 19 (JD) and Zhonghuang 30 (ZH)) soya bean (Glycine max (L.) Merr.) cultivars were used to investigate the influence of soil drying on the abscisic acid (ABA) accumulation in leaves, stomatal conductance (g_s), leaf water relations, osmotic adjustment (OA), leaf desiccation tolerance, yield and yield components. The greater ABA accumulation was induced by soil drying, which also inducing g_s decreased at higher soil water contents (SWC) and leaf relative water content (RWC) significantly decreased at lower SWC in the new soya bean cultivars than in the old soya bean cultivars. The soil water threshold between the value at which stomata began to close and the RWC began to decrease was significantly broader in the new cultivars than in the old cultivars. The new cultivars had significantly higher OA and lower lethal leaf water potential than old cultivars when the soil dried. The old cultivars had greater biomass, but lower grain yield than the new cultivars in well‐watered, moderate stress and severe stress conditions. Thus with soil drying, the new soya bean cultivars demonstrated greater adaptation to drought by inducing greater ABA accumulation, stomatal closure at higher SWC, enhanced OA and better water relations, associated with increased leaf desiccation tolerance, greater water use efficiency and higher yield.  相似文献   

Die internationale arbeitsgemeinschaft für bodenfruchtbarkeit (IOSDV) in der internationalen bodenkundlichen union trauert um ihren vorsitzenden professor eduard von boguslawski     

Dr. Hans‐Richard Wegener 《Archives of Agronomy and Soil Science》2013,59(6):451-455

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European eel distribution and body condition in a river floodplain: effect of longitudinal and lateral connectivity     

E. Lasne  A. Acou  A. Vila‐Gispert  P. Laffaille 《Ecology of Freshwater Fish》2008,17(4):567-576

Abstract – We studied eel population characteristics (size classes, densities and body condition) in the lower Loire River floodplain (France) to evaluate the effects of longitudinal and lateral gradients. A total of 36 sites were electrofished in June 2005. The sites were grouped first into three river segments according to the distance inland corresponding to a longitudinal gradient and secondly into three lateral connectivity categories. Results indicate that small eels, especially those ≤300 mm, were very abundant downstream but density rapidly decreased upstream. In addition, eels ≤150 mm tended to be most abundant in connected waterbodies. Conversely, the distribution of larger eels was quite uniform across both dimensions. Eel condition decreased upstream. In parallel, in downstream river segment, eels had a lower condition in disconnected waterbodies than in connected ones. Eel specialists still have only a longitudinal perception of eel habitat. Our results suggest that lateral gradients should be also taken into consideration.  相似文献   

干法保存30年的鲤鱼脑垂体催情异育银鲫产卵成功     

姜祖蓓  姚春军  丁锋  邬士元  贺军  俞豪祥 《现代渔业信息》2007,22(12):17-18

首次报道用干法保存了30年的鲤鱼脑垂体催情异育银鲫产卵成功。当该垂体的剂量分别为10、20、30mg/kg亲鱼体重时,各获得50%、70%、90%的催产率,以及60.08±0.49%、70.42±0.32%、75.27±0.28%的受精率和79.93±0.29%、80.46±0.55%、81.10±0.26%的孵化率,平均每尾约250g体重的亲鱼产异育银鲫鱼苗0.976万尾。这些鱼苗和正常对照组的鱼苗一样,已经培育成体格健壮的优质鱼种。  相似文献   

WTO框架下提高荆门市主要农产品竞争优势的思考     

侯英雄  吴升山 《中国农业信息》2000,(5):25-27

分析了荆门市主要农产品竞争力和收益潜力,在此基础上,提出4点对策:一是调整农业结构,提高农产品质量;二是强化农业基础设施建设,改善农业生产条件;三是以科技创新为重点,增加农业科技含量;四是延长农业产业链,推进农业产业化经营.  相似文献   

龙游县碳化篾生产现状及其存在的问题     

吴柏林  邵宏军  胡忠明  汪竹清  胡瑞财 《竹子研究汇刊》2012,31(3):9-12

通过对龙游县碳化篾生产企业(业主)的调查,全县自2008年以来,发展碳化篾生产企业(业主)32家,碳化炉65只,集中分布在龙游县庙下乡、溪口镇,占全县生产企业的97％.年消耗竹材2 202万支,实现销售利润l 357.2万元,产品附加值低.在碳化篾生产过程中,产生大量的废水,年产生废水27 300 t；由于废水处理成本高,得不到及时处理,大部分生产企业乱排,给当地的水质造成严重污染.该文通过对全县碳化篾生产企业的调查分析,指出当前碳化篾生产过程中存在的主要问题,希望引起政府重视,并根据碳化篾生产的实际情况,制定有效措施,及时解决碳化篾生产过程中的一系列问题.  相似文献   

氟唑磺隆原药高效液相色谱分析方法研究     

姜宜飞  Wu Jinlong  单炜力 《农药科学与管理》2008,29(8)

本文采用高效液相色谱法,以乙腈 水为流动相,使用以ZORBAX 80A Extend-C18、5μm为填料的不锈钢柱和二极管阵列检测器,在240nm波长下对氟唑磺隆原药进行分离和定量分析.结果表明氟唑磺隆的线性相关系数为1.0000;标准偏差为0.37;变异系数为0.41%;平均回收率为99.8%.  相似文献   

Characterizing Submergence Survival Strategy in Rice Via Chlorophyll Fluorescence     

C. Sone  O. Ito  J.‐I. Sakagami 《Journal of Agronomy and Crop Science》2012,198(2):152-160

Rice plants cope with flash floods using either an ‘escape strategy’ involving rapid shoot elongation or a ‘quiescence strategy’ involving survival underwater with minimal activity. To clarify the differences in the response of leaf photosynthesis properties to conditions during and after submergence, two rice cultivars were compared: a non‐shoot‐elongating cultivar IR 67520‐B‐14‐1‐3‐2‐2 (IR67520) and a shoot‐elongating cultivar IR72442‐6B‐3‐2‐1‐1 (IR72442). Twenty‐three‐day‐old seedlings were submerged in 80‐cm‐deep water for 14 days. During submergence, the chlorophyll contents of the upper fully expanded leaf (5th leaf) and newly developed leaf later (6th leaf) and the maximal quantum yield of photosystem II (F_v/F_m) of the fifth leaf decreased earlier in IR72442 than in IR67520. In the submerged sixth leaf, F_v/F_m was higher in IR72442 than in IR67520 at early measurement. Although F_v/F_m of the sixth leaf in submerged IR67520 increased substantially from 2 days post‐submergence, IR72442 decreased because of leaf chlorosis. Therefore, a non‐shoot‐elongating cultivar coped with submergence by inhibiting photodamage and maintaining high chlorophyll content in the leaves. The shoot‐elongating cultivar was able to maintain the photosynthetic capacity of the newly developed leaf during submergence by prompt reduction of chlorophyll and chlorophyll fluorescence in the leaf that developed before submergence.  相似文献   

大豆斑驳粒总类黄酮Zr^4＋络合物的TLC扫描分析     

滕冰  吴宗璞 《大豆科学》1999,18(1):42-46

本文报导了一个新的大豆斑驳粒微量“总黄酮”的分析方法，。采用Ｚｒ＾４＋与黄酮类化合物生成有荧光的络合物，借薄层色谱扫描技术，测定滤纸荧光斑点的峰面积积分值，用于定量分析。Ｚｒ＾４＋在酸性条件下与黄酮类化合物的络合作用可使类黄酮化合物定性，并有利于区别于黄烷醇类化合物。该方法应用盱大豆感染ＳＭＶ产生斑驳的发生机理研究，有良好的效果。  相似文献