异噻菌胺原药高效液相色谱分析方法研究     

董文凯  姜宜飞  王胜翔  郭海霞  石隆平 《农药科学与管理》2015,36(1):37-39

本文采用高效液相色谱法,以乙腈+磷酸溶液为流动相,使用ZORBAX SB-C18色谱柱和二极管阵列检测器,在280nm波长下对异噻菌胺原药进行分离和定量分析。结果表明,该分析方法的线性相关系数为1.000 0,标准偏差为0.39,变异系数为0.39%,平均回收率为100.08%。  相似文献   

郑州市城市绿地人工群落调查及物种多样性分析     

毛洁  郭欢欢 《河南林业科技》2017,37(2)

以郑州市公园绿地、附属绿地中的120个人工植物群落为研究对象,调查其群落结构和物种多样性,利用Margalef丰富度指数、Shannon-Wiener多样性指数、Simpson多样性指数和Pielou均匀度指数对郑州市城市绿地人工群落的物种多样性进行研究,结果表明郑州市城市绿地人工群落的丰富度指数均处于较高水平,植物多样性丰富,其中公园绿地丰富度指数最高,道路附属绿地次之,社区附属绿地最低。  相似文献   

新陆中70号的选育与栽培要点     

张朝晖  曹娟  郭玲玲  李天义 《中国棉花》2015,42(6):42-43

由新疆塔里木河种业股份有限公司选育的新陆中70号(原代号TH-08-824),在2011―2012年新疆维吾尔自治区早中熟棉区域试验和2013年新疆维吾尔自治区早中熟棉生产试验中,表现出高产稳产、早熟性好、纤维品质优良的特性。本文根据新陆中70号生物学特性,提出了其栽培技术要点。  相似文献   

赣南林业可持续发展的探讨     

宋祥兰  郭小宁  李小青 《中国林副特产》2015,(2):86-87,90

可持续发展的理念是一种科学的发展观,注重经济发展的同时,也应注重生态环境和资源的可持续利用。在中国社会发展的过程中,林业建设发挥着重要的作用,对于生态环境和经济发展有着巨大的贡献。赣南是个山多地少的农业大市,保护和合理开发赣南的森林资源既能造福子孙后代,又能促进赣南经济社会协调发展。立足赣南本地的林业现状,阐述林业可持续发展对策。  相似文献   

核磁共振法测定甲哌鎓原药的含量     

魏泱  王晓莉  郭幸丽  刘晶晶 《农药科学与管理》2014,35(12):49-52

采用定量核磁共振法建立了甲哌鎓原药的定量方法。以重水为溶剂,仲丁基脲为内标物,以化学位移分别在δ3.12的甲哌鎓甲基和δ1.10的仲丁基脲甲基的1H-NMR信号作为定量峰。以甲哌鎓与仲丁基脲定量峰的峰面积比(AS/AI)对甲哌鎓与仲丁基脲的质量比(WS/WI)进行线性回归,线性相关系数为0.999 9;重复测定同一批次原药含量,变异系数为0.28%。采用核磁共振波谱法对甲哌鎓进行定量分析,操作简便,测定速度快,准确度高。  相似文献   

A calibration method of detecting soil water content based on the information-sharing in wireless sensor network   总被引：2，自引：0，他引：2  

Rong-biao ZhangJing-jing Guo  Lei ZhangYe-cheng Zhang  Li-hong WangQi Wang 《Computers and Electronics in Agriculture》2011,76(2):161-168

In agricultural production, there is contradiction between the cost and accuracy of detection during the course of acquiring soil water content (θ) online. This conflict is one of the core issues of automatic water-saving irrigation technology in agriculture. At the same time, capacitive soil moisture sensor (CSMS) has received considerable attention, for it can acquire θ with low cost and high precision, and meet the application requirements of wireless sensor network (WSN). But CSMS is vulnerable to the soil temperature (T_s) and salinity (S_s) in the measurement process. Therefore, this study took EC-5 sensor for example to establish water detection calibration models of soil temperature and salinity for single sensor, using Least Squares Support Vector Machines on MatLAB (LS-SVMlab) as the tool. On this basis, we explored the spatial variability of T_s and S_s, and then a method, which could be used to calibrate the output signals of sensors in multi-point network, was proposed based on the information-sharing (T_s or S_s) technology of WSN. Through laboratory experiment, we effectively reduced the impact of soil temperature and salinity on the single sensor. In example analysis, we investigated the detection precision and costs under different information-sharing radiuses (r). And the results indicated that the method we proposed based on the information-sharing technology of WSN could successfully calibrate the influence of soil temperature and salinity on sensors in multi-point network, and it was an efficacious approach to determine the balance between the calibration accuracy of moisture sensor and the investment of agricultural production. For example, while the calibration precision of soil temperature and salinity is respectively 1%, the costs can be reduced by 30%.  相似文献   

杉木老龄林群落的种-多度关系研究     

蔡锰柯  刘圣恩  林开敏  赵长存  郑文辉  何宗明  郭玉硕 《热带作物学报》2015,36(3):617-622

以杉木老龄林群落为研究对象,结合对数级数和对数正态分布模型,建立3 600 m2的大样地分析杉木老龄林群落的种-多度关系。结果表明:样方的平均物种数和个体数分别为6.86种和35.75株,各样方的物种数及个体数存在极显著正相关关系,说明杉木老龄林群落中生境空间对物种个体的承载能力,还未限制其物种数量。个体数-种序(p>0.05)和频度-种序(p>0.05)的分布曲线均符合对数级数分布;对数正态分布模型则能够较好拟合个体数-种序(p>0.05)的分布曲线,但频度-种序(p<0.05)的分布曲线则不适合用该模型来解释。随着尺度的增加,物种数和个体数的变异系数、二者间的相关性及物种数的方差逐步下降,个体数的方差却呈上升的趋势。  相似文献   

我国当前“油荒”出现的原因与解决措施     

郭琛 《油气储运》2011,30(9):718-719,632

近几年,我国多次发生部分地区、个别时段成品油终端销售短缺的现象。"油荒"并非由于我国柴油资源量不足,而是多种因素共同作用的结果。针对近期"油荒"现象及其特点,从我国油品市场定价与监管机制、供应端与需求端的特点和矛盾、成品油调运手段、油品保供有效能力等方面,深入分析了产生"油荒"的深层次原因。基于此,提出了5个完善我国成品油供应保障体系的解决措施:完善成品油定价机制、健全多层次储备体系、建立应急快速反应机制、加强供应端管理和强调社会责任、进一步增强有效保供能力。  相似文献   

苹果属无融合生殖SERKs基因家族的克隆和表达分析     

张丽杰  郭苏漫  董文轩 《分子植物育种》2015,(5)

本研究利用同源克隆法以苹果属平邑甜茶和杂种后代叶片为试验材料,克隆得到4个SERK基因家族片段,并分析了SERKs家族基因在平邑甜茶和杂种后代不同器官和组织中的表达情况。研究结果表明:分离获得的4个SERK基因家族片段的氨基酸序列与模式植物拟南芥、烟草等植物的同源性均在84%以上,同时与其他物种的氨基酸序列进行Blast比对都具有较高的同源性;RT-PCR定量分析结果表明SERK1、SERK2、SERK3、SERK4基因主要在生殖器官中表达。因此,推测SERKs基因在平邑甜茶和杂种后代生殖发育过程中起着重要的调控作用。本研究结果为进一步揭示无融合生殖的发生机理奠定了基础。  相似文献   

Association analysis for detecting significant single nucleotide polymorphisms for phosphorus-deficiency tolerance at the seedling stage in soybean [Glycine max (L) Merr.]     

Lihua Ning  Guizhen Kan  Wenkai Du  Shiwei Guo  Qing Wang  Guozheng Zhang  Hao Cheng  Deyue Yu 《Breeding Science》2016,66(2):191-203

Tolerance to low-phosphorus soil is a desirable trait in soybean cultivars. Previous quantitative trait locus (QTL) studies for phosphorus-deficiency tolerance were mainly derived from bi-parental segregating populations and few reports from natural population. The objective of this study was to detect QTLs that regulate phosphorus-deficiency tolerance in soybean using association mapping approach. Phosphorus-deficiency tolerance was evaluated according to five traits (plant shoot height, shoot dry weight, phosphorus concentration, phosphorus acquisition efficiency and use efficiency) comprising a conditional phenotype at the seedling stage. Association mapping of the conditional phenotype detected 19 SNPs including 13 SNPs that were significantly associated with the five traits across two years. A novel cluster of SNPs, including three SNPs that consistently showed significant effects over two years, that associated with more than one trait was detected on chromosome 3. All favorable alleles, which were determined based on the mean of conditional phenotypic values of each trait over the two years, could be pyramided into one cultivar through parental cross combination. The best three cross combinations were predicted with the aim of simultaneously improving phosphorus acquisition efficiency and use efficiency. These results will provide a thorough understanding of the genetic basis of phosphorus deficiency tolerance in soybean.  相似文献