新疆南疆籽棉超高产机理研究

为探寻新疆南疆地区籽棉9000 kg·hm-2超高产机理以及相关的指标,对南疆地区生态条件下超高产田、高产田、中高产田进行了调查研究与数据采集。研究发现:要获得超高产,首先要有良好的基础地力,有机质含量超10 g·kg-1,种植密度18×104~21×104株·hm-2为宜;其次,塑造良好株型,株高65~75 cm,茎粗接近10 mm,果枝9~10台,棉铃空间分布均匀,纵向上、中、下果枝棉铃比例3.2∶4.7∶2.1,横向第一、二果节比例7∶3,初花至盛铃LAI、SPAD、Pn一直维持较高水平,盛铃前后达到最大,后期下降缓慢;最后,氮磷钾分配上,前期差异不大,进入花铃期生殖生长明显增强,蕾花铃氮磷钾比例明显增大,一直维持到见絮,超高产处理的蕾花铃干物质量比例明显高于其它处理8%以上,见絮时蕾花铃干物质量达到了6 402 kg·hm-2。以指标数据作参考,塑造良好株型,协调棉铃空间分布,维持较高较长的光合速率,减缓LAI、SPAD下降速度,促进生殖生长,合理养分分配,便能实现产量目标。     

新疆彩棉产业发展建议

 围绕新疆彩棉产业的发展,从生产、科研、市场等方面提出了发展建议：（1）新疆彩棉生产应走环境友好、高效发展之路。（2）彩棉研发应着力创新,突破现有“局限性”。（3）彩棉市场应优化定位,立足于其商业性,实现销售量的提高。     

荒漠区开垦干扰下子午沙鼠种群数量动态与繁殖特征

子午沙鼠(Meriones meridianus)是我国半荒漠、荒漠地区的常见鼠种之一,是内蒙古阿拉善荒漠的优势鼠种,也是荒漠草原的主要害鼠.2002年-2006年每年4月、7月、10月上旬,采用铗日法,对内蒙古阿拉善荒漠开垦区子午沙鼠种群数量及繁殖情况进行了专门调查,结果表明,子午沙鼠种群的数量变动可以引起种群内繁殖特征的变化,而繁殖特征的变化也直接影响种群数量.种群数量调节表现为典型的密度制约.种群数量升高时雌雄性比和胎仔数相对下降.反之则雌雄性比和胎仔数相对升高.繁殖特征的变化在一定程度上可以起到调节种群数量的作用.     

Fortification of pork loins with docosahexaenoic acid(DHA) and its effect on flavour

Pork is traditionally low in docosahexanoic acid(DHA, C22:6n-3) and deficient in omega-3 fats for a balanced human diet. DHA as triglycerides was commercially prepared from the microalgae Schizochytrium and injected into fresh pork loins. Treatments of a mixed brine control(CON), 3.1% sunflower oil in mixed brine(SF) and a 3.1% DHA oil in mixed brine(DHA) were injected into pork loins at 10 mL/100 g and grilled at 205°C. After cooking, the CON and SF pork loins contained 0.03 to 0.05 mg DHA/g of pork and the DHA injected loins contained approximately1.46 mg DHA/g. This also changed the fatty acid profile of omega-6: omega-3 from, 5 to 1 in the CON pork, to a ratio of 1.7 to 1 in DHA pork. The appearance, odor, oxidation rates and sensory taste, as judged by a trained panel,determined the DHA injected meat to be, ‘slightly desirable' and gave lower ‘off flavour' scores, relative to the CON and SF injected pork. Pork can be fortified with DHA oil to 146 mg/100 g serving, which would meet half the recommended daily omega 3 fatty acid requirements for adult humans and would be desirable in taste.     

灌溉定额和施氮量对机采棉田水分运移及硝态氮残留的影响

水资源短缺和土壤环境污染严重是制约农业可持续健康发展的瓶颈,迫使农民开发和采用可持续的农业生产技术。水分运动机理和氮肥残留行为是评价干旱地区农业水肥管理水平的依据,提高水氮利用效率是降低环境污染这一重要科学问题的重要途径。本研究采用裂区试验设计,以灌溉量为主区,设2250(低灌溉量,W1)、3450(传统灌溉量,W2)和4650 m~3 hm–2 (高灌溉量, W3) 3个灌溉量;设0 (空白, N1)、300 (传统施肥量, N2)和600 kg hm–2 (高施氮量, N3) 3个纯氮投入量,在干旱的中国西北内陆棉区开展2年的田间试验,评估灌溉和施氮策略对水氮运移、籽棉产量、水氮生产效率的影响。结果表明,灌溉量及水氮耦合效应是影响籽棉产量及灌溉水生产力的影响因素,其中灌溉量是主效应。2年均值表明,灌溉量为W1时,施肥量由N1增加至N3,生育期0～80 cm平均土壤含水量呈先显著上升后显著下降的趋势, N2和N3处理较N1处理籽棉产量分别提高13.8%和7.6%,水分利用效率分别提高13.6%和6.8%;灌溉量为W2和W3时,施肥量由N1增加至N3,生育期0～80 cm土层平均含水量...     

The Solar Acoustic Spectrum and Eigenmode Parameters

The Global Oscillation Network Group (GONG) project estimates the frequencies, amplitudes, and linewidths of more than 250,000 acoustic resonances of the sun from data sets lasting 36 days. The frequency resolution of a single data set is 0.321 microhertz. For frequencies averaged over the azimuthal order m, the median formal error is 0.044 microhertz, and the associated median fractional error is 1.6 x 10(-5). For a 3-year data set, the fractional error is expected to be 3 x 10(-6). The GONG m-averaged frequency measurements differ from other helioseismic data sets by 0.03 to 0.08 microhertz. The differences arise from a combination of systematic errors, random errors, and possible changes in solar structure.     

Transitions between blocked and zonal flows in a rotating annulus with topography

The mid-latitude atmosphere is dominated by westerly, nearly zonal flow. Occasionally, this flow is deflected poleward by blocking anticyclones that persist for 10 days or longer. Experiments in a rotating annulus used radial pumping to generate a zonal jet under the action of the Coriolis force. In the presence of two symmetric ridges at the bottom of the annulus, the resulting flows were nearly zonal at high forcing or blocked at low forcing. Intermittent switching between blocked and zonal patterns occurs because of the jet's interaction with the topography. These results shed further light on previous atmospheric observations and numerical simulations.     

木门市场行情热价格坚挺因若何?

据统计,以我国每年新增的大约10亿m2的商品房建筑面积,加之旧房改造装修大约5亿m2的面积,其中室内门占10%,而各类木质门又为其中的70%的数量计算,几乎潜在有超过1亿m2木门需求的巨大市场.