生境群

The comparative study on vegetation background survey of the stationsand the comparison on level of phytocoenology on zonal habitats indicates thatthe diminishment of the numbers of families,genus and species,compositionof life types,diversity of communities and habitats,;and the increscence in theproportion of photosynthesis functional groups of C3/C4 plant,richness ofspecies,density of tussock and tiller,diversity of species,evenness,leaf areaindex,leaf area duration,dry matter production of communities alongside thelatitude increasing and the temperature decreasing;and the dynamic curve ofthe community productivity also tend to steadily increase along with thetemperature going up and the heat accumulation gradually in moderate-temperate steppe station from violent fluctuation along with seasonal badly-distribution of precipitation in warm-temperature steppe station;manifestingthat transformable tendency of productivity pattern of the community from morevigorous net assimilation,sparser and higher crops stricture of tussock and tiller,and possession on more resources by less species inclined to thicker in densityof crops,superior effectiveness of multi-leaves and pattern of multi-speciesresource sharing,reflecting that bigger disparity of the vegetationcharacteristics and the style of the community growth in the two differentthermal-type steppe stations owing to background of natural-historicenvironment and combination of water and heat.

内蒙古草原区两个不同热量型研究站点植被本底调查和显域地境群落学水平的比较研究表明：随纬度增加和气温降低，植物科、属、种的数目，生活型组成，群落类型和生境类型的多样性均趋于减少，而C3/C4光合功能群比值和群落的物种丰富度，株丛密度，物种多样性，群落均匀度，叶面积指数，叶面积持续时间和群落干物质生产能力均趋于增加，群落生产力动态曲线从随天然降水的季节分布不均而剧烈波动趋向于随气温逐渐升高和热量逐步积累而稳定增长，显示出两站点植物群落从较为旺盛的群体净同化作用、较为稀疏高大的群体结构和少数物种占有较多群落资源的生产力格局向较高的群体密度、优良的多叶性能和多物种资源共享的群落生产力格局转变，反映出在内蒙古草原区不同的自然历史环境背景和不同的温度条件及其水热组合状况影响下，两个不同热量型草原站点植被性质的分异特征和显域地境群落生长模式的较大差别。

After thirty-five generations, the two groups and their offspring were isolated reproductively because of their strong habitat preferences: they mated only within the areas they preferred, and so did not mate with flies that preferred the other areas.

经过35代，这两个果蝇群出现生殖隔离，因为它们有强烈的生境偏好：它们只在它们喜欢的区域交配，因此不与喜欢其它区域的果蝇交配。

The result of correlative analysis showed, the importance values of Valeriana amurensis reached 49.9% and 49.1% in Ass.

重要值作为一种综合性指标，在衡量黑水缬草在群丛中相对重要性的同时，也指出了黑水缬草分布的最适生境。

To determine the optimal thresholds in image segmentation,a new method based on niching particle swarm optimization is proposed in this paper.

为了得到分割图像的最佳阈值，提出了一种基于小生境粒子群算法的图像分割方法。

A new particle filtering algorithm was proposed, which introduced Swarm Intelligence niching technique into particle filtering in order to enhance particles diversity and search ability and convert above issues into a multi-modal optimization so that measure information is fully. As a result, particles can move towards the high likelihood areas which increase precision for system state estimation.

提出了一种新的粒子滤波算法，将群智能算法中的小生境技术引入粒子滤波中，增强粒子的多样性和寻优能力，同时将上述问题转化为多模寻优问题从而充分应用观测信息，使得采样后的粒子朝着高似然区域移动，从而有效地提高系统状态估计精度。

The method uses maximum between-class variance technique,by the optimization of the niching particle swarm optimization object function,the optimal thresholds can be gotten,and the image by use of the thresholds can be segmented.

该方法基于最大类间方差阈值分割技术，用小生境粒子群算法对适应度函数进行优化，得到最佳阈值，并用该阈值对图像进行分割。

Pollen exine ultrastructure were compared for 18 populations growing under in the same environment by means of scanning electron microscope.

借助扫描电镜对栽培在同一生境下的18个半夏居群的花粉形态、大小及表面纹饰等特征进行观测比较。

In this study, the three measures all improved the grassland habitat, increased the soil fast-acting nutrient and forage grass proportion in the grass group.

通过改良试验研究，3种措施都改善了草地生境，增加土壤速效养分，增加牧草在草群中所占的比重。

To understand the Francois' Langur's ecological habits and activity rhythm, and explore its adaptation to the Karst habitat, data on time budgets and activity patterns were collected from one group of Francois' Langurs between March and December 2001 in the Fusui Rare and Precious Animal Nature Reserve, Guangxi Province , China using continuous recording method.

为全面了解黑叶猴的生态习性和活动规律，从中探讨其对喀斯特石山生境的适应策略，从2001年3~12月，在广西扶绥珍贵动物保护区对一群黑叶猴进行了连续的跟踪观察，采用连续记录法收集相关的行为数据。

Even in mid winter, the feeding Ruddy Shelducks in farmland were not equally distribute in farm fields.

浅水与草地是赤麻鸭种群在拉市海保护区越冬时所始终喜好的生境类型。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。