淀山湖湖水氮与叶绿素的时间格局转变研究     

梅雪英  张修峰  史利江  郑丽波 《水生态学杂志》2010,31(6):1-5

采用STARS（sequential t-test analysis of regime shifts）,以淀山湖湖水中TN、NH3-N、Chl-a和SD为指标,研究了淀山湖湖水氮与叶绿素在1991-2006年间的格局转变规律,分析了转变前后氮与叶绿素的格局特点。结果得出：1991-2006年间,淀山湖湖水中NH3-N和TN含量均存在两种格局,一次转变,发生转变的时间均在2000年;格局转变前NH3-N平均含量为0.649 mg•L-1,转变后为2.014 mg•L-1,是转变前的3.1倍;湖水TN的平均含量格局转变前为2.550 mg•L-1,转变后3.726 mg•L-1,是转变前的1.5倍。淀山湖湖水中Chl-a含量和SD也均存在两种格局,转变均发生在2001年。格局转变前湖水中Chl-a平均含量9.341ug•L-1,转变后19.713ug•L-1,是转变前的2.1倍;湖水SD在转变前平均62 cm,转变后降低为43 cm。2000年的格局转变指数（RSI）2.185,其中NH3-N的RSI 1.038,TN的1.147;2001年的RSI为1.341,其中Chl-a的0.318,SD的为1.023。  相似文献   

农机“大”国勿忘“小”处     

朱礼好 《当代农机》2011,(3):27

日前,中国农机工业协会发布的2010年农机工业运行报告显示,2010年我国农机行业共完成工业总产值2838.1亿元,比2009年同期增长26.36%;工业销售产值完成2768.15亿元,比2010年同期增长25.46%。据工业协会的人士介绍,这个数字使我国成为仅次于美国的第二大农机制造国。  相似文献   

天然林保护工程封山育林国家投资标准探讨   总被引：1，自引：0，他引：1  

张铁平  卢立 《林业调查规划》2013,(5):76-78

以重庆市涪陵区2012年天保工程封山育林规划设计概算为依据，将涪陵区现行天保工程封山育林按国家标准的投资进行细分，在此基础上结合实际情况进行重新调整，提出了天保工程封山育林新标准，为确定天保工程封山育林标准提供参考。  相似文献   

固定沙地樟子松容器育苗及造林技术研究     

张执慧  张振立 《内蒙古林业调查设计》2010,33(1):21-22,79

樟子松容器苗造林是一项实用高效的林业造林生产技术,对半干旱固定沙地较为适宜。文章介绍了樟子松容器育苗技术及容器苗造林技术,旨在提高樟子松育苗成活率,并在当地推广此项技术。  相似文献   

保定市科技兴农现状与建议     

任咏梅  胡士杰  白丽 《农技服务》2013,30(5)

2012年中央一号文文件强调,实现农业持续稳定发展、长期确保农产品有效供给,根本出路在科技。笔者肯定了保定市科技兴农的成果,同时也客观分析保定市在科技兴农中存在的不足之处,并提出了相关建议,以期保定市的农业真正实现可持续增长。  相似文献   

钱塘江定向钻穿越预制施工场地选择的借鉴意义     

叶林  张玲  张磊 《山东饲料》2013,(24):189+202

长输管道定向钻穿越施工是长输管线进行三穿施工的一种常见方式。笔者通过江南水网各种管径数十条定向钻穿越管段预制的亲身经历,尤其是浙江省天然气杭甬天然气输气管道工程中钱塘江定向钻穿越的预制场地的选择,给同类大口径长距离定向钻穿越施工的预制场地选择提供了一定的借鉴意义。  相似文献   

A Technique for Rearing Chilo suppressalis in the Large Scale with an Oligidic Diet in Laboratory     

HU Yang  ZHENG Yong li  CAO Guo lian  FU Qiang 《中国水稻科学》2013,27(5):535

  相似文献   

应用RT-PCR方法检测水稻植株和介体昆虫体内的水稻齿叶矮缩病毒   总被引：3，自引：0，他引：3  

雷娟利  吕永平  金登迪  陈声祥  陈剑平 《植物病理学报》2001,31(4):306-309

 将生物学接种和RT-PCR检测水稻植株体内的水稻齿叶矮缩病毒的方法进行了比较,发现结果基本趋于一致,但总体上RT-PCR检测阳性率稍高于生物学接种的发病率。将生物学接种检测褐飞虱介体内水稻齿叶矮缩病毒方法与RT-PCR检测方法进行比较分析,发现RT-PCR方法可以检测单头褐飞虱体内的水稻齿叶矮缩病毒,具有很高的准确性和灵敏度。  相似文献   

A pharmacokinetic study including some relevant clinical effect of medetomidine and atipamezole in lactating dairy cows     

Ranheim B  Arnemo JM  Ryeng KA  Søli NE  Horsberg TE 《Journal of veterinary pharmacology and therapeutics》1999,22(6):368-373

Medetomidine is the most potent and selective alpha2-agonist used in veterinary medicine and its effects can be antagonized by the alpha2-antagonist atipamezole. The pharmacokinetics of medetomidine and atipamezole were studied in a cross-over trial in eight lactating dairy cows. The animals were injected intravenously (i.v.) with medetomidine (40 microg/kg) followed by atipamezole i.v. (200 microg/kg) or saline i.v. after 60 min. Drug concentrations in plasma were measured by HPLC. After the injection of atipamezole, the concentration of medetomidine in plasma increased slightly, the mean increment being 2.7 ng/mL and the mean duration 12.1 min. However, atipamezole did not alter the pharmacokinetics of medetomidine. It is likely that the increase in medetomidine concentration is caused by displacement of medetomidine by atipamezole in highly perfused tissues. The volume of distribution at steady state (Vss) for medetomidine followed by saline and medetomidine followed by atipamezole was 1.21 and 1.32 L/kg, respectively, whereas the total clearance (Cl) values were 24.2 and 25.8 mL/min x kg. Vss and Cl values for atipamezole were 1.77 mL/kg and 48.1 mL/min x kg, respectively. Clinically, medetomidine significantly reduced heart rate and increased rectal temperature for 45 min. Atipamezole reversed the sedative effects of medetomidine. However, all the animals, except one, relapsed into sedation at an average of 80 min after injection of the antagonist.  相似文献   

The Distribution of Soluble Copper- and Zinc-Binding Proteins in Liver and Kidney of Chronic Copper-Poisoned Goats     

Milica Mjr-Grimsrud  Nils E. Sli  Gunnar Norheim 《Acta veterinaria Scandinavica》1980,21(4):578

The distribution of copper and zinc among the soluble proteins in the liver and kidney from chronic copper-poisoned goats was examined after gel filtration of the proteins. The concentrations of copper in the liver and kidney cortex from five experimentally copper-poisoned goats were: 550–810 µg/g liver and 190–420 µg/g kidney cortex (wet weight). In general the copper-binding proteins from, both the liver and kidney samples were separated into two different fractions with approximate molecular weights (m.w.) of > 65,000 and 10,000, respectively. From the liver samples, varying amounts of copper were eluted in a fourth fraction with m.w. < 2,000. In the majority of kidney samples the dominating copper-binding protein fraction was the high molecular weight fraction. Absolute amounts of copper recovered in the metallothionein-like protein fraction were nearly the samt for all samples investigated. The distribution of zinc-binding proteins in both liver and kidney samples was nearly the same. The high molecular weight fraction dominated, and no zinc was bound to metallothionein-like proteins.  相似文献