黔中地区水稻土的含硒量及其对糙米硒含量的影响

通过贵州开阳县水稻土硒含量特征和该区水稻硒含量之间关系的调查研究表明:开阳县水稻土水溶性硒含量高于一般水稻土水溶性硒的临界值(0.01μgg-1),这与该区的成土母质、地形等因素有关。富硒水稻土使水稻对硒的吸收增加,该县出产的稻米硒含量普遍比贵州省其它地区高,平均含硒量高于粮食硒的正常含量范围(0.04~0.07μgg-1)。水稻地上各部分含硒量存在差异,糠、秸秆中的含硒量高于糙米,糙米含硒量与土壤硒含量的相关性达极显著水平(r=0.7861*,P<0.05)。     

照片,就要打出来 佳能发布腾彩PIXMA系列喷墨打印机新品

8月26日,佳能(中国)有限公司在上海举行了"照片,就要打出来"新品发布会。会上发布了包括成龙限量版单反照片一体机腾彩PIXMA MG6280,具有低打印成本,更多打印量的经济打印一体机PIXMA E500等8款佳能腾彩PIXMA系列喷墨打印机。全面升级后的佳能腾彩PIXMA系列将在家用机领域形成齐备规整的产品线。     

广东不同母质发育水稻土钾素的固定与释放

本文通过室内模拟和化学方法研究了广东几种不同母质发育的水稻土的钾素的固定与释放特性。结果表明,砂页岩、珠江三角洲沉积物、石灰岩和玄武岩发育的水稻土的固钾量均随钾加入量的增加而增大,但花岗岩发育的水稻土却相反;砂页岩、花岗岩和玄武岩发育的水稻土的固钾量在淹水时最高,而沉积物和石灰岩发育的水稻土则在恒湿时最高;沉积物发育的水稻土的非交换性钾累计释放量和平均释放速率显著高于其它母质发育的水稻土;施钾肥对非交换性钾释放的影响因土壤所含粘土矿物类型而异。     

佳能发布腾彩PIXMA系列喷墨打印机新品

近期,佳能在上海举行了“照片．就要打出来”新品发布会。会上发布了8款佳能腾彩PIXMA系列喷墨打印机。其中最引人注目的当属佳能腾彩PIXMAE500。它搭载的超大容量黑色墨盒拥有高达800页的打印量．     

高速发展中的佰腾数码广场

以成都数码广场为基础发展而来的佰腾集团，他们的成功模式难以复制，甚至连佰腾集团掌门人唐立新自己都难以复制。当时的成都IT商圈中充满着太多的不确定因素，这恰好造就了佰腾集团这个西南电脑城的枭雄。然而当我们有幸对其履历进行一次近距离地浏览时，我们发现，高速扩张背后依然充满着无数的执着与艰辛。     

动态——耀腾公司在全球Web交换技术市场市场占有率第一

不久前，耀腾公司在北京举行的iNet大会上由耀腾公司的总裁Dominic Orr先生宣布耀腾公司在Web交换技术市场上占有全球营业额的49．6％，位居该市场的第一。     

佳能PIXMA推动照片打印——佳能腾彩PIXMA系列喷墨打印机新品超越期待

<正>2011年8月26日,佳能(中国)有限公司在上海举行了"照片,就要打出来"新品发布会。会上发布了包括成龙限量版单反照片一体机腾彩PIXMA MG6280,具有低打印成本,更多打印量的经济打印一体机PIXMA E500等8款佳能腾彩PIXMA系列喷墨打印机。全面升级后的佳能腾彩PIXMA系列将在家用机领域形成齐备规整的产品线,为广大佳能用户带来崭新的影像体     

照片，就要打出来——佳能腾彩PIXMA系列喷墨打印机新品超越期待

2011年8月26日,佳能（中国）有限公司在上海举行了“照片．就要打出来”新品发布会。会上发布了包括成龙限量版单反照片一体机腾彩PIXMAMG6280,具有低打印成本,更多打印量的经济打印一体机PIXMAE500等8款佳能腾彩PIXMA系列喷墨打印机。     

五套联想深腾1800机群服务复旦大学四大院系

近日，联想深腾1800机群再次成功中标复旦大学化学系的信息化建设项目，高效承载了该系在分子动力学领域的专业软件应用。迄今为止，联想深腾1800机群系统分别在复旦大学的智能信息处理实验室、经济学院，生命科学院和化学系连中五项大单。     

“群英聚首，技览天下”

据了解，由美国立维腾电子（深圳）有限公司主办，北京神州数码有限公司协办的“群英聚首，技览天下”美国立维腾智能化产品解决方案推广大会最后一站在北京海淀区成功举办。此次北京站举办的立维腾智能化产品解决方案推广大会是继武汉、成都、南京各地之后的第四站也是最后一站，为此次整个推广大会划上了圆满的句号。     

Regional scale mapping of fractional rice cropping change using a phenology-based temporal mixture analysis

Monitoring changes of paddy rice is challenging due to its diverse cropping patterns and spectral variation. To investigate the spatio-temporal changes of rice cropping, we used the 10-day composited Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) time series data with a spatial resolution of 250 m to map the sub-pixel rice spatial distributions in the Hunan Province, the top one region in rice planting area in southern of China. A method of improved phenology-based temporal mixture analysis (PTMA) was presented to identify early, middle, and late rice cropping patterns. The results show that the PTMA is effective to extract rice cropping. The nine rice cropping patterns were classified as early, middle, and late rice cropping, and fractional rice cropping within 250 m pixels was obtained to analyse the internal changes. Both the local planting conditions and different forms of rice cultivation were compared with statistical data. Overall, MODIS-estimated fractional rice agreed well with field samples at the pixel level and statistical data at the county level, which demonstrates the effectiveness of the PTMA method for mapping rice in these hilly regions with small-size paddy rice field. The changes show that single-cropping rice and double-cropping rice have been frequently transferred in space, which could be important information to support agricultural decision-making.     

粳稻品质与穗部性状关系的研究

采用聚类分析、回归分析等方法对辽宁省近年来32个水稻品种(品系，以后简称品种)品质性状和穗部性状进行分析。结果表明：弯穗型品种品质指标优于半直立穗型品种，半直立穗型品种品质指标优于直立穗型品种。依品质性状参试材料可聚类为6类，第1类辽盐40组品质特点是垩白率、垩白度较高；第2类是辽粳294组，品质指标普遍很好；第3类辽粳5号组，垩白率、垩白度偏高；第4类沈农654组，直链淀粉含量较高，垩白率、垩白度较高，胶稠度较小。黎明、辽粳326各成一类．垩白率、垩白度很高。直立穗型品种成粒率、谷粒长对品质影响很大；半直立穗型品种一次枝梗、成粒率、谷粒长宽比对品质影响很大：弯穗型品种穗长、二次枝梗／一次枝梗、成粒率、一次枝梗对品质影响很大。以提高成粒率为重点，可使穗部性状各指标实现优化组合，实现优质。     

The relationships between electrical conductivity of soil and reflectance of canopy,grain, and leaf of rice in northeastern Thailand

Soil salinity is a global environmental problem and the most widespread land degradation problem that reduces crop yields and agricultural productivity. The characteristic of soil salinity is conventionally measured by the electric conductivity (EC) of soil while remote-sensing techniques have been extensively applied to detect the presence of salts indirectly through the vegetation using crop spectral reflectance. This study aims primarily to investigate whether salt stress the rice can be detected by field reflectance or not, and second, to search the significant bands of vegetation indices that can indicate the relationships between the EC of soil and field hyperspectral reflectance of canopy, grain, and leaf of rice, using the normalized difference spectral index (NDSI). Field investigations on various paddy fields in northeastern Thailand were carried out in late November 2010 during the ripening season just before harvest in an attempt to realize the applications of the field hyperspectral technique for monitoring the spread of saline soils and estimation of the effects of soil salinity on rice plants. Jasmine rice and glutinous rice were two different rice species selected for this study. Rice plant investigations were conducted by collecting data on crop length, panicle length, canopy openness, leaf area index, and digital photographs of plant conditions from each site. The statistical analysis revealed that the changes in soil EC were significantly sensitive to the ripening stages of both jasmine rice and glutinous rice planted on different levels of soil salinity. Among reflectance measurements, canopy reflectance was highly correlated with soil EC. However, the estimated accuracies of the relationship between soil EC and reflectance of glutinous rice were relatively lower than those of jasmine rice.     

Influence of frequent flood disaster on agricultural productivity of rice planting and structural optimization strategy

Frequent flood disaster causes great loss of rice planting. Therefore, the study on the influence of frequent flood disaster on the agricultural productivity of rice planting and the structural optimization strategy was put forward. Firstly, the data of experimental area were used to design the implementation period, duration of flooding, flooding depth, experimental plot and contrast plot, and then appropriate analysis methods were selected to test the influence of frequent flood disaster on agricultural productivity of rice planting. Experimental results show that if the waterlogging time is more than three days, the production efficiency will decrease by more than 50%. The earlier the flood happens, the more serious the influence on production efficiency. Based on the experimental results, the optimization strategies of rice planting agricultural structure are formulated as follows: reasonable layout, overall improvement of land economic efficiency and utilization; optimization of rice varieties and improvement of rice quality; deepening of farmers' organizational degree, improving the agricultural scale of rice planting; promoting the development of rural science and education, adjusting the industrial structure of rice planting agriculture, and perfecting the rice planting industry chain.     

基于特征波段的SPOT-5卫星影像水稻面积信息自动提取的方法研究

为了快速、准确地从遥感影像上提取水稻信息,满足国家农情遥感监测系统要求,以黑龙江省852农场水稻提取为例,利用SPOT-5卫星影像数据,分析了水稻和其它背景地物的光谱特征,发现利用原有波段难以提取复杂的水稻信息,因此利用植被特征波段：归一化植被指数（NDVI）作为新波段融入原始影像中,在增加有效信息量的同时运用简单决策树模型提取水稻信息,并参照地块现状矢量图进行精度评价。结果表明,该方法的总体提取效果较好,其提取精度与通常的监督分类方法相比有了较大的提高,只是在水稻和玉米交界处有误判现象。     

不同水稻品种的SSR多态性分析

选用分布于水稻12条染色体上的249对SSR引物，对9个不同类型水稻品种进行DNA扩增，筛选到具有3条以上特异扩增条带的SSR引物39对，其中能揭示籼粳多态性的引物有6对。用筛选到的引物在9个不同水稻品种间的扩增结果，初步分析了SSR标记的多态性及用于水稻指纹分析、籼粳分化分析和聚类分析的潜力。     

水稻抛秧高产的田间小气候研究

本课题通过1995～1996年水稻生长季抛秧和手插秧两种不同栽培形式的田间小气候平行对比观测试验，结合气象台站同期常规气象观测资料，研究了水稻抛秧田间光、温、湿、风等气象要素时空变化规律及其生态效应，揭示出抛秧稻高产除与其自身高产因索有关外，主要与较好的田间小气候有关。     

施用调制剂对水稻秧苗体内某些生化特性的影响

通过田间试验,研究了草甸土施用“亚大Ⅱ号”牌水稻旱育苗床土调制剂对水稻秧苗体内某些生化特性的影响。结果表明：随着调制剂用量的增加和床土pH值的降低,水稻秧苗体内超氧化物歧化酶（SOD）、苯丙氨酸解氮酶（PAL）过氧化物酶（POD）、多酚氧化酶（PPO）活性提高,秧苗素质改善,抗病能力随之增强。     

1974年以来辽宁省审定的水稻品种分析

７０年代以来，辽宁省通过审定的水稻品种逐步增多，累计６５个。新品种的产量呈上升趋势。杂交粳稻辽优１号和株型理想的直立穗品种辽粳２４４的培育成功，使区域试验亩产量分别突破５００和６００ｋｇ，其它品种的产量水平也明显提高。促使水稻新品种产量增长的关键因素是增加了杂交粳稻和理想株型品种的每穗成粒数。