种群数量

• The results show that 20 % metarhizium anisopliae oil has certain effects on controlling caged locusts , although it has no ideal total result on controlling the high definition locusts in short - term
  结果表明： 20 %杀蝗绿僵菌油剂对笼罩内蝗虫的防治具有一定的控制作用，但短期内对高密度蝗虫种群数量的总体控制效果不理想。
• At different angles and using different methods , many specialists and scientific workers had been researched and probed how to enlarge the total population of red - crowned cranes for saving the endangered species
  国内外的许多专家和科学工作者都从不同的角度，采取不同的方法进行研究探索扩大丹顶鹤的种群数量，来拯救这一濒危物种。
• At the same time , the age structure , time - specific life table , survivorship curve , fecundity schedule and leslie matrix were obtained through ana1ysing the demography and age struct ' ures of each subpopulation
  对种群年龄结构研究中，编制了种群静态生命表、生殖力表，利用建立的矩阵模型预测了种群数量的动态趋势，并进行了环境筛的分析，推断了种群致危因素。
• Bacillus subtilis strain tl2 was proved to be able to colonize in different tissues inside the tea plant , and the community quality and diversity index of the endophytic bacteria were both decreased in tea plant with the time after inoculated
  摘要枯草芽孢菌株tl2接种茶树后，可以从茶树不同组织分离到细菌，其细菌种群数量随着时间逐渐减少，其细菌多样性系数也随着时间有所降低。
• The release of organophosphate pesticides to the soil environment will disturb the community structure of soil microorganisms . some groups were decreased or disappeared , but some groups which can adapted to the contamination have been the dominant groups
  有机磷农药释放到环境中，必定会对环境中的微生物群落产生影响，持续的污染使得有的微生物种群数量减少以至被淘汰，有的则适应污染环境而成为优势群。
• Rolando wrote in an e - mail message , “ because most species during summer forage in grass , and some also make nests on the ground . ” the researchers found that the habitat loss also affected arthropod populations ; there were fewer insects in the trail plots , so there was less food for the birds
  研究人员还发现，栖息地减少同样影响节肢动物的种群数量；滑雪场内的昆虫较少，于是鸟类便很难在滑雪场内找到食物。
• The population quantity of lithocolletis ringoniella mats , made up the absolute predominance from the middle ten days of july to the beginning of august and the population quantity of aphis citricola van der goot made up the absolute predominance from the last ten days of april to the beginn ing of june
  山楂红蜘蛛种群数量在3月中旬4月中旬占绝对优势，金纹细蛾种群数量在7月中旬8初占绝对优势，绣线菊蚜种群数量在4月下旬6月初占绝对优势。
• The over - wintering form population of hawthorn spider mite in free - pollutant culture apple orchard was ground orchard > southern exposure orchard > northern exposure orchard . there had significant level at 0 . 01 among these three orchards . culture condition affected the distribution of tetranychus viennensis zacher also
  果园立地类型对越冬态山楂红蜘蛛的分布有着显著的影响，越冬态山楂红蜘蛛种群数量平地园阳坡园阴坡园，三者之间差异达极显著水平。
• Centropages tenuiremis is a mainly dominant species in xiamen waters during winter - spring . there is a noticeable character in its life history , that in may and june , when the population of this species begin to reduce gradually , the females could produce diapause eggs with long spines on their surface to over summer - autumn ( from july to november )
  瘦尾胸刺水蚤( centropagestenuiremisthompsen & seott ， 1903 )是厦门海区冬春季节的主要优势种，其生活史中一个显著的特点就是在种群数量逐渐减少的5 6月间，雌体会产出表面遍布长刺的滞育卵，以滞育形式度过不利其生长繁殖的夏秋季( 7 11月) 。