查询词典 decrease in population

The spatial distribution dispersion rules of Evodia meliaefolia population and Camellia oleifera population were also analyzed by using the geographic information system software Arcview3.2 assembled with R2V by the way of substituting temporal change with spatial difference.

本文以位于广州市内的白云山风景名胜区森林植被中的芳香植物楝叶吴茱萸群落为研究对象，在调查样地设置50个10 m × 10 m的样方，应用相邻格子法进行调查，对楝叶吴茱萸群落的组成及结构特征、主要树种的分布格局类型进行了分析；采用R2V、Arcview3.2等地理信息系统软件以&空间差异替代时间变化&的方式，对楝叶吴茱萸和油茶种群空间扩散规律进行模拟分析，从而探讨森林景观的物种流功能。

Because microsatellite DNA accords with Mendelian inheritance and can reflect population relationship more reliability. mtDNA is extranuclear inheritance and belongs to maternal inheritance and is not superiority in population relationship analysis.

由于微卫星DNA符合孟德尔遗传规律，能够反映群体间的亲缘关系，构建的系统发育树结构可靠。mtDNA是核外遗传物质，具有母系遗传的特点，在反映群体间的亲缘关系上不具优势。

AIM: To report the demographic characteristics of a sample of population affected by exudative age-related macular degeneration in the region of Castilla-Leon (North-Central Spain), and to compare them with a group of population of the same age and from the same geographic area.

目的：报告在西班牙Castilla-Leo地区患有渗出性老年性黄斑变性的样本人群的流行病学特点，并与一组来自同一地区和相同年龄人群进行比较。

The P. flagellaria clonal population distributing in the Songnen grassland was studied,and we observed the season dynamics of petiole length and the total stolon length as well as pattern of spacer length,compared the numbers of maternal ramets,daughter ramets and single ramets as well as the yearly dynamics of total biomass in 3 years (2003,2005,and 2006). Furthermore,we analyzed the correlation between population quantative character and the community's quantative character.

以松嫩草地羊草草甸内分布的蔓委陵菜无性系种群为研究对象，观测了叶柄长度、匍匐茎总长度的季节动态以及间隔子长度分布格局，比较了3个年份（2003、2005、2006年）的种群母株数、分株数、独立株数和总生物量年间动态，分析了种群数量特征与其所分布的群落的数量特征之间的相关关系。

P. flagellaria population plots were set in north the Leymus chinensis meadow of Northeast Normal University grassland ecological experiment station. P. anserina population plots were set in Yaojingzi grassland nature reserve of Jilin.

蔓萎陵菜种群样地设在东北师范大学草地生态实验站北甸子羊草草甸群落内；鹅绒委陵菜种群样地设在吉林省腰井子草原自然保护区内。

Seven Brachionus species in Lake Jinghu were found, of which Brachionus calycflorus, B. angularis, B.diversicornis and B.forficula were determined as common species due to their higher population densities and occurrence frequency. The population density of both B.calyciflorus and B. angularis reached the peak in February and March and decreased rapidly after April, while that of both B. diversicornis and B. forficula remained high during June-September and decreased sharply after October.

结果表明，镜湖常见的7种臂尾轮虫中，仅萼花臂尾轮虫、角突臂尾轮虫(B.angularis)、裂足臂尾轮虫(B.diversicornis)和剪形臂尾轮虫(B.forficula)的种群密度和出现频率较高；前两者种群密度高峰期均出现在2~3月份，4月份后均较低；后两者种群密度在6~9月份较高，而在10月份后很快下降。

Ramet population density, ratio of root to shoot and ramet population spatial pattern of Fragaria vesca varied along the elevation gradient in the transitional zone between Qinghai-Tibet plateau and Sichuan basin.

本文通过两个野外调查实验，研究在不同光照条件下聚花过路黄的克隆构型以及分株种群特征和野草莓分株种群特征随海拔梯度的变化。

Two field investigations were conducted to study clonal architecture and ramet population characteristics of Lysimachia congestiflora growing in different light conditions and the variation of Fragaria vesca ramet population characteristics along the elevation gradient in the transitional zone between Qinghai-Tibet plateau and Sichuan basin.

本文以青藏高原与四川盆地过渡带四种匍匐茎草本克隆植物为对象，应用野外调查和实验生态学方法研究克隆植物对异质性环境的适应对策以及克隆整合、克隆内分工行为对克隆植物在不同海拔生境中生长的贡献。

Twelve strains and a representative farmed population of Hizikia fusiformis were sampled from its principal cultivation ground, i.e. Dongtou county, Zhejiang province. Important characteristics of these strains were compared and genetic diversity of the population was analyzed using AFLP technique.

对中国羊栖菜主产区浙江省洞头县的12个羊栖菜养殖品系的重要形态特征进行了比较研究，并利用AFLP技术对一个典型养殖种群的遗传多样性进行了分析。

LIMITATIONS: Study population may not be generalizable to the general population.

限制：研究人群可能无法代表一般人群。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。