种群比较

In the experiment, we choose the area where the topography is smooth and the distribution of L. chinensis is relatively even.

实验选择羊草分布相对均匀、以羊草为单优种群且地势比较平坦的样地，样地大小为6m×6m，共10块。

Due to the fact that the method based on local linearization is usually lost in local minimum values and the optimization solution is dependent on the selection of initial solution,the standard genetic algorithm has po...

该算法利用拟网格法初始种群和综合交叉策略，克服了早熟收敛现象，从而提高了遗传寻优的效率。理论模型反演与其它方法比较，结果说明遗传算法具有不依赖初始模型，不容易陷入局部极小，多点多路径概率搜索，以及隐含并行性等优点。

Gregory Paul, in a 1989 article, compared known impacts and super eruptions of the Mesozoic with radiations of the major pterosaur, dinosaur, and bird groups to see if a pattern could be identified.

格雷戈里·保罗在1989年发表的一篇文章里，比较了当时已知的中生代的撞击与火山活动，用发光法测定了翼龙、恐龙和鸟类种群，试图找出一个固定的模式。

The sum of BCOD of BODst test and XH measured through batch respirometer is consistent with the BCOD of BODlt test and the ratio between them was in the range of 0.88-1.02 with average 0.94. The BODlt test is time-consuming and the microorganisms'population and their metabolic characteristic are different from that of the actual activated sludge process. So the respirometry has the advantage of time-validity and representation for the actual activated sludge system.

6呼吸测量法测得的BCOD明显小于长期BOD测试方法的结果，这是由于后者得到的BCOD包括所有的活性微生物COD组分；短期BOD测试得到的BCOD与异养菌COD之和与长期BOD测试得到的BCOD比较接近，两者之比在0.88-1.02之间，平均值为0.94；长期BOD测试耗时长，测试用的微生物种群及其代谢类型都与实际活性污泥过程明显不同，因此，从测试结果的时效性和代表性方法考虑，短期BOD测试更具优势。

This is different from previous researches, in which long-distance founder effect is the main force of phylogeography of rotifer population.

各湖泊隔离年代比较短，不同湖泊轮虫种群之间扩散强度大，轮虫休眠卵库的存在，以及近几十年来各湖泊环境条件变化可能是造成"有时滞基因流"产生的原因。

This is the first time to study the biology and population of Zoysia japon.ica in China, and get some results as follows.

本文在国内首次对结缕草的生物学和种群生态学进行了比较系统的研究，结果如下： 1。

This is the first time to study the biology and population of Zoysia japonicain China,and get some results as follows.

本文在国内首次对结缕草的生物学和种群生态学进行了比较系统的研究，结果如下

This weed population had a wider niche breadth, the second widest among 12 major weed populations in weed community, and had bigger niche overlap with Stellaria alsine, Alopecurus acquallis, Malachium aquaticum, Poa annua, Polygonum persicaria and Lapsana apogonoides. In rape, wheat or fallow, B.

在杂草群落中，草的生态位宽度居第2位，说明其有潜在的较强的适应环境的能力；草与雀舌草、看麦娘、牛繁缕、早熟禾、春蓼和稻搓菜等杂草种群的生态位重叠较大，与它们的生态要求比较接近。

Genetic cluster analysis is similar based on the results of morphological and DNA markers, the five populations could be divided into three groups. But there are different groups sort of individual locations, reflecting the similarities and difference about the analysis of the relationship between population with the two kinds of markers, It could be concluded that there was coupling and relevance to some extent in evaluating genetic diversity with the same experiment sampling by morphological and SSR marker variation. However, there was also differences. In research, the two can complement each other.8. Identification of Genetic Relationship of Amygdalus plants by SSRThe genetic relationship among 55 Amygdalus plants collections, belonging to 6 species and collected from both homeland and abroad were identified via SSR molecular marker technique.

新疆野扁桃遗传多样性不同研究分析方法结果的比较与评价表型与DNA二种水平的遗传标记方法揭示的遗传多样性水平有差异，表型性状比DNA分子标记具有更大的变异性；其受到环境的影响较大，也即对环境更敏感。2种水平的遗传标记聚类结果将野扁桃5个不同分布群体均可分为3个大类群，但是出现有个别不同的群体排序位置，反映了2种标记在分析种群间关系上的异同性，从本研究结果来看，说明表型与DNA标记有一定的耦合性和相关性，但也存在差异，在研究上可以互为补充。8。

Morphological differences among four shrimp groups of Litopenaeus vannamei imported from aquicultural agencies of the United States were studied with 13 morphological parameters using three multivariation analysis methods (cluster analysis, discriminant analysis, and component analysis).

中文摘要：采用3 种多元分析方法，对来源于美国的4 个凡纳滨对虾种群的13 个形态比例参数进行比较研究。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。