种群密度
- 名population density
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平衡种群密度与环境容纳量k值相等。
The equilibrium population density is equivalent to the carrying capacity K.
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棉花苗期棉叶螨(Tetranychuscinnabarinus)种群密度估计方法
Estimation of Population Density of the Carmine Spider Mite ( Tetranychus cinnabarinus ) in Cotton Field
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晚秋月份种群密度变化资料用Fuzzy法统计分析表明,10、11月每天进入畜舍的虫口相对密度分别为7~18只与6~12只。
Adult density was 7-18 and 6-12 in Nov by Fuzzy analytic method .
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主要探讨了在水库水藻类水华现象中pH值的变化,发现水体pH值与藻类数量之间存在较好的相关性,并在pH值与藻种群密度D之间尝试性建立数学模型。
This paper discusses the change of pH in algae blooming in reservoir , pH is relativity to the quantity of algae and gets its model .
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本文研究了两类具有种群密度制约接触率的SIR流行病模型,其生态学结构分别为常数输入和Logistic出生。
Two SIR type epidemic models with population size dependent contact rate are analyzed . The demographic structures considered here are recruitment and logistic birth , respectively .
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两种草杂的种群密度(X)与甘蔗产量损失率(y)之间的关系呈双曲线关系。
The results indicated that there existed hyperbola relationships between the density ( X ) of two weed 's communities and the impairment loss percentage ( Y ) of sugarcane yield .
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实验分析了堆肥过程中有机质、pH值、水溶性有机碳、微生物种群密度、半纤维素酶活、羧甲基纤维素酶活、半纤维素和纤维素含量等指标随时间的变化特征。
Changes were studied including pH , organic matter , dissolved organic carbon ( DOC ), the biomass of microorganism , hemicellulase activity , carboxymethyl cellulose enzyme ( CMCase ) activity , hemi-cellulose and cellulose contents .
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群体感应(QuorumSensing,QS,又称阈值敏感)是细菌根据种群密度大小进行细胞内或细胞间信息交流,协调群体行为并调控基因表达的一种方式。
Quorum sensing is the regulation of gene expression in response to fluctuations in cell-population density and allows populations of bacteria to synchronize group behaviors .
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棉铃虫成虫一般在日落后30min(20∶00)左右大量起飞,种群密度在1h后达到峰值。
H.armigera moths were observed to take off at dusk ( 20 ∶ 00 ), a half hour after sunset , and population density reached peak period in 1h .
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小叶章群落不同水位梯度的季节动态曲线显示,除10和20cm的水位梯度,种群密度具有随着水位梯度的升高而降低的趋势。
Angustifolia communities , except at 10 and 20 cm water levels , the higher the water level , the lower the population density was . While in C.
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结论:CDC和UV诱蚊灯人房捕蚊效果较好,建议采用两类诱蚊灯捕蚊,这是云南省蚊媒种群密度调查或捕蚊的有效途径之一。
Conclusion : The efficiencies of collecting mosquitoes are very useful for CDC and UV lamp-traps , It is showed that either CDC lamp-trap or UV would be one efficient way to monitor the population densities of mosquitoes and collecting mosquitoes in Yunnan province .
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4μg三唑酮处理的木霉根际竞争定殖指数、以及在4~8cm和10~14cm根段的根际木霉种群密度均高于不施药对照。
By the treatment of 4 μ g triadimefon , rhizosphere competence index of T. harzianum and its population density at 4 8 cm and 10 14 cm root segments were higher than untreated control .
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湿草甸蚯蚓平均种群密度(151条/m~2)和生物量(36.16g(Fw)/m~2)为最高;
Maximum of average population density ( 151 / m ~ 2 ) and biomass ( 36.16g ( FW ) / m ~ 2 ) occured in wet meadow .
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结果表明,温度、盐度、DIN的变化对研究海域丹麦细柱藻种群密度的增长有比较重要的影响,DIN是营养限制因子。
It is shown from the calculated results that the changes in salinity , temperature and dissolved inorganic nitrogen ( DIN ) play an important role in the increase of Leptocylindrus danicus population density in the study area , and DIN is a nutrient limiting factor .
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应用Berger-Parker(1974)优势度指数(d)分析得出了不同时期果园蜘蛛群落的优势类群及优势种,并对优势种蜘蛛的田间种群密度和动态进行了初步分析;
Berger-parker ( 1974 ) index of dominant degree ( d ) showed that dominant species and dominate species of spider community in orchard in different time . Whereas , density and trends in fields of dominant species of spider were primary analysed .
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控制的目的是使三种群密度跟踪给定的理想轨迹。
The goal is to make practical output track ideal output .
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几种实验条件对蚁狮种群密度分布的影响
The influence different experimental conditions on the distribution density of Ant-lion
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昆虫种群密度估计的空间自相关方法
Spatial autocorrelation method used for the estimation of insect population density
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种群密度随径级增大而减小。
The population density decreases with the increase of diameter class .
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随种群密度增加,生物量呈逻辑斯蒂曲线递减。
And the biomass is Logistic decrease with the density increase .
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低的种群密度不足以立即阻止种群下降。
A low population is not sufficient to halt a decline .
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水稻灌溉对嗜人按蚊种群密度与消长的影响
Impact of Paddy Irrigation to Density and Dynamics of Anopheles anthropophagus
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分布的聚集强度与密度有关,随种群密度的升高而增大。
Its aggregation degree increased with the increase of population density .
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蝇类种群密度监测方法的探讨
The Research on the Monitoring Methods of Flies Population Density
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上海中心老城区蝇类种群密度变化分析
Survey and Analysis on Variety of the Flies Population Density in Shanghai
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城市园林鸟类种群密度研究
Research on the population density of birds in garden city
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昆虫种群密度的二项抽样估计模型研究进展
Development of binomial sampling models for predicting insect population density
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苏州市城区室内蜚蠊种群密度季节消长调查研究
Investigation on seasonal variation of cockroach density indoor in Suzhou urban districts
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全年种群密度变化呈单峰型。
The yearly population density fluctuates in a single peak .
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影响禾谷缢管蚜种群密度的因子分析
Effects of ecological conditions on population density of bird cherry oat aphid