粟类作物稃片植硅体形态研究回顾与展望     

张健平  吕厚远  葛勇  邵孔兰 《第四纪研究》2019,39(1):1-11

中国是粟、黍的起源地,但受植物遗存保存状况及研究方法的限制,对粟类旱作农业起源与驯化的时间、地点、种类、过程等的认识仍然存在不同观点。植硅体分析为准确鉴定粟、黍及其野生祖本和亲缘物种提供了新的途径。本文总结了近几年来针对粟、黍种子稃片植硅体研究取得的新进展,获得以下认识:1)进一步明确了稃片表皮长细胞植硅体的形态特征、大小、数量是鉴定考古文化堆积中粟、黍及其野生祖本和亲缘野生物种的可靠指标;2)通过对比我国北方常见的狗尾草属稃片植硅体,发现了ΩⅢ型仅发育于粟和青狗尾草的稃片中部,且其大小与狗尾草属野生植物差异显著;3)分析和说明了稃片植硅体鉴定流程和方法、重点强调了稃片Ω/η类型的鉴定特征和应用范围,以及植硅体统计量等关键问题;4)讨论了粟类稃片植硅体产量与农作物产量的关系以及植硅体埋藏学问题,最后对深化粟类植硅体形态学研究提出了初步建议。希望通过本文的总结与讨论,能够使植硅体分析方法在粟类作物起源和传播的研究中得到更准确、更广泛的应用。  相似文献   

A mesoscale eddy detection method of specific intensity and scale from SSH image in the South China Sea and the Northwest Pacific   总被引：2，自引：0，他引：2  

ChunHua Zhang  XiaoLiang Xi  SongTao Liu  LianJun Shao  XiaoHua Hu 《中国科学:地球科学(英文版)》2014,57(8):1897-1906

Mesoscale eddies exist almost everywhere in the ocean and play important roles in the ocean circulation of the world. These eddies may cause sound spread singular regions and bring great influences to the upwater ship and underwater aircraft. Due to the lack of hydrographic survey datasets, study of mesoscale eddies has been greatly restricted. Fortunately, satellite altimeter provided an effective way to study mesoscale eddies. An automatic detection algorithm is introduced to detect mesoscale eddies of specific intensity and spatial/temporal scale based on satellite sea surface height (SSH) data and the algorithm is applied in a strong eddy activity region: the South China Sea and the Northwest Pacific. The algorithm includes four steps. The first step is preprocessing of the SSH image, which includes elimination of error SSH data and interpolation. The second step is to detect suspected mesoscale eddies from preprocessed SSH images by dynamic threshold adjustment and morphological method, and the suspected mesoscale eddy detection includes two procedures: suspected mesoscale eddy core region detection and suspected mesoscale eddy brim extraction. The third step is to pick out mesoscale eddies satisfied with specified criteria from suspected mesoscale eddies. The criteria include three items, that is, intensity criterion, spatial scale, criterion and temporal scale criterion. The last step is algorithm performance analysis and verification. The algorithm has the capability of adaptive parameter adjustment, and can extract mesoscale eddies of interested intensity and spatial/temporal scale. The paper can provide a basis for analyzing space-time characteristics of mesoscale eddy in the South China Sea and the Northwest Pacific.  相似文献   

Seasonal Dynamics of Rhizosphere Soil Microbial Abundances and Enzyme Activities under Different Vegetation Types in the Coastal Zone,Shandong, China          下载免费PDF全文

Gang Xu  Peng Chen  Jun‐Na Sun  Hong‐Bo Shao 《洁净——土壤、空气、水》2014,42(8):1115-1120

  相似文献   

Erratum to: Cloning, characterization, and expression analysis of the DEAD-box family genes, Fc-vasa and Fc-PL10a, in Chinese shrimp (Fenneropenaeus chinensis)     

周倩如  邵明瑜  秦贞奎  康庆浩  张志峰 《中国海洋湖沼学报》2010,28(2):426-426

<正>In the original article, the name of the fourth author is incorrect. The correct one is Kyoung Ho Kang, in which "Kang" is the family name. The publishing companies apologize to the author.  相似文献   

Cloning, characterization, and expression analysis of the DEAD-box family genes, Fc-vasa and Fc-PL10a, in Chinese shrimp (Fenneropenaeus chinensis)     

周倩如  邵明瑜  秦贞奎  康庆浩  张志峰 《中国海洋湖沼学报》2010,28(1):37-45

  相似文献   

Erratum to: Cloning, characterization, and expression analysis of the DEAD-box family genes, Fc-vasa and Fc-PL10a, in Chinese shrimp (Fenneropenaeus chinensis)     

Qianru Zhou  Mingyu Shao  Zhenkui Qin  Kyoung Ho Kang  Zhifeng Zhang 《中国海洋湖沼学报》2010,28(2):426

  相似文献   

Evaporation Process in Soil Surface Containing Calcic Nodules on the Northern Loess Plateau of China by Simulated Experiments     

Yuanjun Zhu  Ming'an Shao  Hongbo Shao 《洁净——土壤、空气、水》2009,37(11):866-871

Soil containing calcic nodules is widely present on the northern Loess Plateau of China owing to soil genesis under local climate conditions. In most studies, little attention is payed to the effect of calcic nodules on soil evaporation and ecoenvironment, resulting in inaccurate evaporation estimation in this kind of soil and further improper field water management measures and irrigation effects. In this paper, soil column experiments were conducted in order to investigate evaporation process in soil containing calcic nodules and the effect of calcic nodules on soil evaporation was determined. The results indicated that evaporation reduction was positively related to calcic nodule content (CNC = mass of calcic nodules/total mass), and could be estimated by the experiential equation: E_soil = E₀ (1 – 0.4 CNC) (E_soil = actual evaporation, E₀ = theory evaporation in soil without calcic nodules). When CNC was below 0.2, the impact could be neglected. While, as CNC exceeded 0.2, the impact needed to be considered during soil evaporation estimation. As CNC reached 0.5, soil evaporation could be reduced by 7.5 mm, accounting for around 10% of the total soil water. Water balance calculation in soil columns showed that water absorbed by calcic nodules was partially available to evaporation. Water available to evaporation was positively related to CNC, and this water could not exceed 63% of the water absorbed by calcic nodules. Generally, evaporation behavior was dominated by calcic nodule quantity and its water absorption. These results provide new ideas for irrigation measures in arid areas of the globe.  相似文献   

丹东形变观测洞室改造     

尤权民  姚圣安  迮安民  姚菲菲  陈尚尉  梁永信  隋玉鹏  邓志岩  刘芳彤 《地震地磁观测与研究》2009,30(3):74-79

“十五”期间,为了新增水管仪、伸缩仪,丹东地震台对形变观测洞室进行了环境改造,新建了仪器基墩,解决了建造仪器基墩过程中遇到的施工难题,为水管仪和伸缩仪运行提供了良好的观测条件。文中介绍的方法对其他台站建造仪器基墩有一定借鉴意义。  相似文献   

经受住汶川8．0级地震考验的RSDA-1采集器     

王翠芳  宋澄  邵玉平  杨晓源 《地震地磁观测与研究》2009,30(4):72-77

RSDA-1地震数据采集器是四川省地震局水库地震研究所于2006年7月～2007年6月研制出的新产品,2007年8月用于瓦屋山水库地震台网的4个台站和紫坪铺水库地震台网的庙子坪地震台。庙子坪地震台位于汶川8．0级地震震中区15km的极震区。截止2008年8月,历时一年并经受住汶川8．0级地震考验的RSDA-1采集器总体运行良好。本文从运行情况、事件定位和“平坦限幅”等3方面说明RSDA-1采集器在两个水库地震台网的运行情况。  相似文献   

Probabilistic Precipitation Forecasting Based on Ensemble Output Using Generalized Additive Models and Bayesian Model Averaging   总被引：2，自引：0，他引：2       下载免费PDF全文

YANG Chi  YAN Zhongwei  SHAO Yuehong 《Acta Meteorologica Sinica》2012,26(1):1-12

A probabilistic precipitation forecasting model using generalized additive models (GAMs) and Bayesian model averaging (BMA) was proposed in this paper.GAMs were used to fit the spatial-temporal precipi...  相似文献