种群密度

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.

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

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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.

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 .

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 .

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 .

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 .

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 .

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 .

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

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

种群密度随径级增大而减小。

The population density decreases with the increase of diameter class .

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 .

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 .

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

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 .

蝇类种群密度监测方法的探讨

The Research on the Monitoring Methods of Flies Population Density

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

城市园林鸟类种群密度研究

Research on the population density of birds in garden city

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

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

全年种群密度变化呈单峰型。

The yearly population density fluctuates in a single peak .

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