优势种

The average heterosis of the grain yield per plant is 75. 79%, 57. 67% and 12. 55% in the hybrids of the common wheat with spelt wheat, club wheat and itself respectively. the heterosis degree of the interspecific hybrid was greater than that of intervarietal hybrid.

普通小麦与斯卑尔脱小麦的种间杂种每株产量的平均杂种优势为75.79%，普通小麦与密穗小麦的种间杂种每株产量的平均杂种优势为57.67%，普通小麦品种间杂种每株产量的平均杂种优势为12.55%，种间杂种优势大于品种间杂种优势。

However, due to the substantially different allocation of resources in various geographic regions, along with their own characteristic formation, agglomerate economies show rather a strong tendency of unhomogeneity, which leads to the unhomogeneous characteristics of their advantages regarding FDI attraction. Therefore, this paper proposes there exists an interactive relationship between the primary advantage and the multi-level agglomerate advantages by dividing the latter one into original agglomerate advantage and late-developing agglomerate advantage.

本文认为虽然随着经济全球化和信息技术的进一步发展，基础性优势的重要性逐步下降，从一种显性优势转化为潜在优势，是东道国吸引FDI的一种比较优势，集聚性优势则起着越来越重要的作用，是东道国吸引FDI的一种竞争优势，两者之间存在着质的差别，但作为分别作用于国家和次国家两个不同层面上的优势，基础性优势和集聚性优势之间存在着互动互补关系，基础性优势是集聚性优势形成的前提，集聚性优势则是对基础性优势的提升，两者共同构成了东道国吸引FDI的二重优势，在东道国吸引FDI中缺一不可。

The results showed that the species number of periphyton was the greatest in summer and the density of dominant species was the highest in summer and autumn, and the water quality was generally consistent with the tendency of the changes both in the indices of diversity and evenness. There were significant negative correlations between the contents of N and P in water, and the indices of diversity, evenness, algae density, total biomass, while CODcr and BOD5 did not show any significant relationship with these four biological indices.

研究结果显示，着生生物种类数以夏季最多，优势种密度以夏、秋季最大，多样性指数、均匀度指数的变化趋势与水质指标的监测结果基本一致；经相关性分析表明：水体中氮、磷含量分别与生物多样性指数、均匀度指数、藻类密度和总生物量四项指标呈显著负相关， CODcr、BOD5与四项生物指标均无相关性。

Beckmannia syzigachne had poor adaptability and competition ability in rape or wheat field with no-herbicide application in history, but would become dominant specie in water logged winter fallow, leading to yield loss of rape and wheat after a few years.

在实行正常农事操作的稻茬油麦田中，与其它主要杂草种群相比，其自然竞争力弱，难以成为群落的优势种。但其具有&喜湿性&的特点，在冬季常常积水的休闲田中，发生量可大幅度上升。

The dominant species were yellow mouse and squirrel.

优势种是达乌尔黄鼠和松鼠类。

Delphastus cataline, originating from North America, is an important predator as biological control agent for the whitefly pests.

小黑瓢虫原产于北美洲，是控制粉虱类害虫的优势种天敌。

The community characteristics of its broadleaved forest are divided into fourteen types by means of investigation, which belong to seven kinds of natural vegetation.

根据样地调查研究，将虞山国家森林公园约占山地面积为74.8%的天然林依群落优势种划分14类群系，为7类植被型。

Red-tide species were in large number. Waters in the East and South were dominant by some red tide species.

福建沿岸海域赤潮生物种类较多，是引发赤潮的潜在生物因素，一些赤潮生物已在闽南、闽东沿岸局部海域成为优势种。

In our country the corn borer is comprised of the Asian corn borer and the Europe corn borer.

玉米螟在我国主要有欧洲玉米螟和亚洲玉米螟，其中亚洲玉米螟在我国是优势种，发生严重，在我国各地均有分布。

This paper tries to find the change tendency of rode nt population through comparative analysis of the structure of desert rodent pop ulation in Dzungaria basin . The result shows the structure of the rodent popula tion is dynamic and the substitute of dominant species is common .

通过对新疆准噶尔盆地沙质荒漠鼠类群落结构的两次对比分析，力求探讨其群落变化趋势，结果表明鼠类群落结构是动态变化的，优势种的更替是普遍存在的。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。