特色芹菜新品种KS四季小香芹的选育

KS四季小香芹新品种是以优良自交系K12为母本,K9为父本杂交,对其杂交后代采用系谱法经过6代系统选育而成。该品种表现早熟,植株直立性好,生长势强,抗逆性强,高产达5 482.68 kg/667 m2,高抗芹菜叶斑病、软腐病,适宜开封及周边地区四季栽培。     

河南省水土保持监测规划布局及运行管理设想

河南省水土保持监测站网是全国水土保持监测网络和信息系统的重要组成部分,包括1个省级监测总站,6个地市级监测分站和29个水蚀监测点.29个水蚀监测点代表着豫西黄土阶地区和黄土丘陵沟壑区,豫北太行山石质山区,豫西南伏牛山南麓风化片麻岩低山丘陵区和豫南大别山花岗片麻岩区.(1)在机构设置及机构性质上,不论是监测总站或分站,均应设置为全额预算的纯公益性事业单位.(2)各类监测机构实行统一管理,分级负责的管理制度,省总站和分站受水利部和省同级水行政主管部门领导,同时接受上级水土保持监测机构的业务指导.(3)参照水文、气象、环境监测、森林资源监测等机构资金筹措办法,机构运行经费纳入同级财政预算.     

试论网络环境下编目工作的新特点

就编目对象、编目规则、编目工作技术手段、编目合作形式和编目人员这五个方面来阐述网络环境下图书馆编目工作的新特点。     

新疆北疆地区农地流转影响因素研究

[目的]针对新疆北疆地区农地流转影响因素的分析,为政府制定相关政策促进农地流转更快发展提供参考.[方法]运用定性方法和主成分分析法、灰色关联分析法定量分析影响农地流转的多个因素.[结果]通过分析得知:影响北疆地区农地流转的四个主要因素农业机械化水平、农村人口从事非农产业人员比重、人均农业生产费用支出、农地受灾面积与农地流转率的关联程度从大到小依次为0.887 3,0.840 3,0.804 9和0.734 2,[结论]要促进新疆北疆地区农地流转的快速发展,必须针对不同的影响因素采取不同的措施.     

30年间河北省曲周县土壤速效钾的时空变异 特征及其影响因素

【目的】速效钾是土壤肥力的重要指标之一,与作物产量和品质密切相关。最近10年随着农业结构调整,机械化程度不断提高,秸秆还田等技术的不断推广,迫切需要研究这些因素对土壤速效钾含量时空变化的影响,从而为土壤肥力评价和管理提供指导。【方法】通过野外调查、采样分析和资料搜集得到了河北省曲周县1980年、2000年和2010年3个不同时期耕层土壤速效钾含量的数据,首先对不同时期土壤速效钾含量进行了常规统计和正态性检验;然后应用地质统计学方法分析了不同时期耕层土壤速效钾含量的空间结构特征,结合GIS空间插值、叠置分析和面积统计功能研究了该区耕层土壤速效钾含量的时空变异特征;最后对各种影响因素（土壤质地、土壤类型和土地利用类型）下的土壤速效钾含量进行了方差分析。【结果】3个时期土壤速效钾的平均含量分别为167.1、90.0和87.7 mg•kg-1,2000年的平均含量比1980年减少了46.1%,2010年比2000年减少了2.6%。具体变化为：1980年速效钾含量为I级地（＞200 mg•kg-1）和II级地（150-200 mg•kg-1）的面积比例分别为5.2%和82.9%,而到2000年和2010年时基本减少到无。1980年III级地（100-150 mg•kg-1）的面积比例为11.9%,到2000年增加到22.3%,2010年进一步增加到31.2%。1980年时没有IV级地（50-100 mg•kg-1）,而2000年和2010年该等级面积比例最大,分别为78.7%和68%。1980年、2000年和2010年土壤速效钾的空间相关距离分别为8.1、2.8和9.8 km。前20年变程呈减小的趋势,而后10年变程呈增加的趋势,这是区域因素与随机因素共同作用的结果。不同质地土壤的速效钾含量顺序为：砂土＜砂壤＜轻壤＜中壤＜黏土。潮土的速效钾含量明显高于盐土。各种农用地中,林地的速效钾含量变化最大,1980年和2000年其含量最小,到2010年其含量最大。【结论】30年来曲周县土壤速效钾含量随时间的推移呈递减的趋势,前20年下降很快,后10年表现为总体略有下降,但局部有上升的趋势。土壤类型、土壤质地、土地利用类型和人为管理措施是其主要影响因素。秸秆还田和平衡施肥等措施对于保持和提升土壤速效钾含量起到了非常重要的作用,需进一步大力推广。     

Osmotic Stress Resistance of Transgenic Tobacco Expressed Soybean Lysine-rich Protein Gene

PM2 gene （accession number： M80664） with high lysine content from soybean （Glycine max） was found in GenBank by changing three BLASTp parameters. Amino acid composition analysis of PM2 showed that Lys content was on the high level of 18.22%. Protein encoded by PM＇2 also belonged to the family of late embryogenesis abundant （LEA） proteins, which was considered that it had a strong relation with the abiotic stress resistance. In this experiment, PM2 gene was obtained from dry soybean seeds by RT-PCR, plant expression vector pEMTPM2 was constructed, and then transformed into tobacco by using agrobacterium-mediated method. Eight salt and drought tolerant lines were obtained from 31 differentiated lines. Real-time PCR showed that PM2 gene overexpressed in all four PCR positive lines with the osmotic stress resistance. These results confirmed that the overexpression of PM2 gene enhanced the osmotic stress resistance of transgenic tobacco.     

甘草浸膏副产品复方添加剂对猪肥育效果及其肌肉游离氨基酸含量的影响

西文采用40头中国瘦肉型猪DⅥ系阉公猪，按其日龄和体重分成2个重复，在其基础日粮中按1％添加甘草浸膏副产品复方添加剂进行为期60d的饲养试验，并观察对肥育的效果及其肌肉游离氨基酸含量的影响。结果表明：①日增重可提高23．32％－23．59％，料肉比降低10．74％－10．90％；②可明显增加猪肌肉中游离氨基酸的含量，同时发现猪半腱肌的游离氨基酸含量明显高于其背景长肌。     

小麦核质杂种主要性状遗传参数的研究

采用数量遗传学的统计方法,对8个稳定的节节麦胞质的普通小麦核质杂种的株高等8个性状的平均数、变异系数、广义遗传力、表现型相关系数、基因型相关系数作了估算。结果表明,（1）各性状变异系数较大的是有效分蘖数、株粒重、穗长和穗粒重,其它性状变幅较小;（2）各性状广义遗传力由大到小顺序为:株高、穗长、小穗数、千粒重、穗粒重、株粒重、有效分蘖数和穗粒数;（3）表现型相关与基因型相关趋势一致,其中穗长与穗粒数和株粒重、株粒重与株高和千粒重、有效分蘖数与株粒重和小穗数显著相关。这些结果与前人用普通小麦作试材的研究结果基本一致。据此,可认为普通小麦选育理论同样适用于核质杂种。     

芦苇定居后铜尾矿细菌群落结构的变化

Soil samples were collected from both bare and vegetated mine tailings to study the changes in bacterial communities and soil chemical properties of copper mine tailings due to reed (Phragmites communis) colonization. The structures of bacterial communities were investigated using culture-independent 16S rRNA gene sequencing method. The bacterial diversity in the bare mine tailing was lower than that of the vegetated mine tailing. The former was dominated by sulfur metabolizing bacteria, whereas the latter was by nitrogen fixing bacteria. The bare mine tailing was acidic (pH = 3.78), whereas the vegetated mine tailing was near neutral (pH = 7.28). The contents of organic matter, total nitrogen, and ammonium acetate-extractable potassium in vegetated mine tailings were significantly higher than those in the bare mine tailings (P < 0.01), whereas available phosphorus and electrical conductivity were significantly lower than those in the bare mine tailings (P < 0.01). The results demonstrated that 16S rRNA gene sequencing could be successfully used to study the bacterial diversity in mine tailings. The colonization of the mine tailings by reed significantly changed the bacterial community and the chemical properties of tailings. The complex interactions between bacteria and plants deserve further investigation.     

Changes of Bacterial Community Structure in Copper Mine Tailings After Colonization of Reed (Phragmites communis)

Soil samples were collected from both bare and vegetated mine tailings to study the changes in bacterial communities and soil chemical properties of copper mine tailings due to reed (Phragmites communis) colonization. The structures of bacterial communities were investigated using culture-independent 16S rRNA gene sequencing method. The bacterial diversity in the bare mine tailing was lower than that of the vegetated mine tailing. The former was dominated by sulfur metabolizing bacteria, whereas the latter was by nitrogen fixing bacteria. The bare mine tailing was acidic (pH = 3.78), whereas the vegetated mine tailing was near neutral (pH = 7.28). The contents of organic matter, total nitrogen, and ammonium acetate-extractable potassium in vegetated mine tailings were significantly higher than those in the bare mine tailings (P< 0.01), whereas available phosphorus and electrical conductivity were significantly lower than those in the bare mine tailings (P< 0.01). The results demonstrated that 16S rRNA gene sequencing could be successfully used to study the bacterial diversity in mine tailings. The colonization of the mine tailings by reed significantly changed the bacterial community and the chemical properties of tailings. The complex interactions between bacteria and plants deserve further investigation.