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population growth
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  种群增长
    The Relationship between Population Growth of Moina irrasa Brehm and Food Concentration as well as Light
    发头裸腹(Moina irrasa Brehm)种群增长与食物浓度及光照的关系
短句来源
    Studies on specific property of population growth of Moina rectirostris, Simocephalus vetuloides, Daphnia pulex forma schoedleri Stars were conducted under 28± 0.5℃ .
    在28±0.5℃控温条件下,对直额裸腹溞(Moina rectirostris)、拟老年低额溞 (Simocephalus vetuloides)、细长型蚤状溞(Daphnia pulex forma schoedleri Stars)进行了种群增长特性的研究。
    During the culture season (temperature 22.6-29.7℃), the generation time of the dominant species Strombidium sulcatum was 6.54-19.80h, population growth rate 0.035-0.106h -1 . The population growth of S. sulcatum was affacted by temperature and amount of food.
    养殖期间(温度为22.6-29.7℃)优势种具沟急游虫(Strombidiumsulcatum)世代时间为6.54-19.80h其种群增长率为0.035-0.106h-1; 其种群增长受温度和食物量的影响。
短句来源
    Rotifer can survive at pH 3. 5 ~ 11. 5, but the optimum pH for population growth is 8. 5. where the rotifer shows a maximum reproductive sped. and the absolute egg density is the highest (132 cells' ml-1 ).
    pH在 5. 5~9. 5之间种群为正增长,即正为正 值.该轮虫存活的pH上限为11.5,下限为3.5.在种群增长最适pH(8.5)条件下,该轮虫 的繁殖最快,即绝对带卵量最高(132个·ml-1);
短句来源
    When the additive dosage of vitamin C was 0.02 mg/ml, accelaration of rotifer population growth could be observed.
    维生素C的添加量在0.02mg/ml时,对轮虫的种群增长有促进作用;
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  种群生长
    Effects of population growth of marine ciliates on the ammonia accumulation at different concentrations of glucose
    不同葡萄糖浓度下海洋纤毛虫种群生长对水体氨积累的影响
短句来源
    The results demonstrate that ciliates can interrupt the normal population growth of bacteria, enhance breaking down organic pollutants and improving water quality.
    该结果表明,纤毛虫的种群生长可以通过打破细菌原来的种群生长模式,加快对水体中有机物质的降解速度,缩短水质净化的过程。
短句来源
    Analysis of data showed that the ammonia accumulation was higher than that of the control during the equilibrium stage of ciliate population growth,and was significantly lower than in the control during the decaying stage either in Euplotes treatments with a range of 0 01-0 2 g/L glucose concentrations or in the Uronema treatments with a range of 0 05-0 2 g/L glucose concentrations.
    结果表明 ,在葡萄糖浓度为 0 0 1 - 0 2 g/L的牛肉浸膏培养液中 ,氨积累在纤毛虫种群生长平衡期高于对照组 ; 在衰退期扇形游仆虫组显著低于对照组 ,而海洋尾丝虫组仅在 0 0 5 - 0 2g/L葡萄糖浓度范围内显著较低。
短句来源
  “population growth”译为未确定词的双语例句
    The relationships between the temperature and the population growth rate of both QD and GZ strain were curvilinear, with the regression equation Y= 0.0009X2 - 0.0061X + 0.4090 and Y= - 0.0144X2 + 0.7412X - 8.3751, respectively.
    青岛品系和广州品系的种群增长率均与温度呈曲线相关,回归方程分别为:Y= 0.0009X2 - 0.0061X + 0.4090和Y= - 0.0144X2 + 0.7412X - 8.3751。
短句来源
    When0. 02~5.00μg/ml of vitamin A is added tobaker's yeast suspension,the population growth rate R increases with the rising concentration ofvitamin A,and reaches the highest value(0.75)at the concentration of 5. 00μg/ml on the 4th day,which is 5. 6times high than that of the controlled group.
    在面包酵母悬浮液中.当添加维生素A为0.02~5.00μg/ml时,随着添加浓度的增大,轮虫的种群增殖率R值也增大。 以添加5.00μg/ml为最佳,第4天的R值达0.75,是对照组的5.6倍。
短句来源
    When the food concentration was 8.2453×10 6cells·ml -1 , the population growth rate reached it's maximum, 0.6085d -1 . Body size tended to enlarge with increasing food concentration.
    当食物浓度为 8.2 4 5 3× 10 6cells·ml-1时 ,种群增长率达最大值 0 .6 0 85d-1;
短句来源
    PRELIMINARY STUDY ON THE POPULATION GROWTH AND DYNAMICS OF SILVER CARP,BIGHEAD, GRASS CARP AND BLACK CARP IN SWAN OXBOW OF CHANGJIANG RIVER
    长江天鹅洲故道鲢、鳙、草鱼和青鱼种群特征与数量变动的初步研究
短句来源
    THE EFFECT OF ADDING FAT-SOLUBLE VITAMIN TO BAKER'S YEAST SUSPENSION ON THE POPULATION GROWTH RATE OF ROTIFER Brachionm plicatilis
    面包酵母悬浮液中添加脂溶性维生素对褶皱臂尾轮虫增殖率的影响
短句来源
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  population growth
A new class of competition models in which the population growth coefficients are represented by periodic delta-functions is designed.
      
Analysis of the available field and published data indicates a two-stage pattern of the population growth phase and a synchronous transition of wolf populations to this phase.
      
Selenium in concentrations of 0.01 and 0.5 mg/liter stimulated cell population growth, while the number of ultrastructural alterations was the same as in the control cells.
      
At a selenium concentrations of 1 mg/liter, cell population growth slightly decreased by the end of the experiment, and there was some increase in the number of cells with damaged organoids and in the number of completely destroyed cells.
      
salina, suppressing cell population growth and promoting extensive destructive changes.
      
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The purpose of the present report is to study the population growth of a highly commercially exploited species, Hairtails, in its major distribution area in order to provide a ibasis for controlling the population dynamics and considering possible management measures.The specimens of the main population used for this study were collected in the northern East China Sea from May 1977 to June 1978, but some elder ones were the spaw-ners in 1976 and 1979, and specimens of other populations...

The purpose of the present report is to study the population growth of a highly commercially exploited species, Hairtails, in its major distribution area in order to provide a ibasis for controlling the population dynamics and considering possible management measures.The specimens of the main population used for this study were collected in the northern East China Sea from May 1977 to June 1978, but some elder ones were the spaw-ners in 1976 and 1979, and specimens of other populations were collected from 9 fishing grounds located in the South China Sea and the southern East China Sea as well as the Bohai Sea and Huangbai Sea in. recent years.Based on the study of the age, the measurement of the body and its otolith transverse section, the relative growth of otolith and population growth pattern as well as the weight-length relationship of this fish, the problem of geographical differences in population growth ih the northern Bast China Sea and elsewhere is discussed. The results of our study are summarized as follows :1.The otolith and (body growth of this fish are 'closely related to the form of the power function curve, so that the otoliih can be used for (back-calculating the fish growth.2.The females fish grows slightly faster than the males, but the growth differences between the sexes are not significant statistically.3.Based on the bimodal distribution of first ring radius of otolith and body length of young fish, it may be concluded that the Hairtails generally consist of two or three groups such as spring and summer and autumn broods, but so far as concerns the main population, it may be devided into two groups by the size of the first ring radius, the earlier-born group .(spring and summer broed, r>0.72 mm) and late-born group au tumn brood, r<0.72mm).4.The weight-length relationships of the main population (A+S) and its earlierborn group(S) and later-born group (A) are expressed in equations 19 - 21.5. The growth pattern of this fish could be expressed in equations 13-24.6.Growth in weight with age for this fish is determined also as a typically asby-metric sigmoid curve, the inflexion corresponding to maximum growth rate occurs at 3.26 age (3.17 for ealier-born group and 3.43 for later-born group). It has been observed that the majority of individuals in 1 age group has attained sexual maturity and all the males and females 'become sexually mature in 2 years. The significance of the infle-xion of the population growth equation by weight should be further netted because the size at instantaneous first capture providing the maximum yield generally lies at around this point.7.The increment and incremental rate of this fish in standard length and weight are described with dL/dt, d2L/dt2, dW/dt and d2W/dt2 curves respectively (F g. 2,4).8.The obvious growth difference in body length and weight between the earlier and later-born group is found only in first two years, but not so obvious in growon parameters such as the limiting body length, weight and inflexion of growth curve for weight.9.The geographical difference in population growth is found obvious orey between the populations of sub-tropical waters (the South China Sea) and temperate waters.10.The Hairtails have a more rapid growth rate than the Large Yelloy Croaker or the Small Yellow Croaker, and its long breeding period as well as the predt tory and mixed feeding habit account for its great productivity. While the number of the other two species of croakers are greatly reduced as a result of heavy fishing pressure., they are still present in significant amount to be the main fish stock of the fishing ground and their growth rate is get higher than years ago. If the fishing of the, last two lowest age, group can be postponed one or two years later, its population productivity may possibly be increased greatly. Thus, it is very promosing to have a further development of this fishery. .

本文根据带鱼耳石横断面切片的显微观测和鱼体测量结果,着重分析物种数量分布中心海区的主体种群和不同季节出生群的生长特征,并对种群生长的地理差异以及年代差异与渔业资源的合理利用问题进行了探讨。

Egg develpoment time and population growth of Brachionus calyciflorus were observed at constant temperature, and the production rate of the species was estimated with three different methods.

1981—1983年,在不同的培养温度下,观察了萼花臂尾轮虫(Brachionus calyciflorus)卵的发育时间、种群的增长并用3种不同方法测算生产量。在5—30℃的培养温度下,轮虫卵的发育时间(D)随温度(T)升高而缩短,其曲线迴归方程为: LnD=2.0539+0.1097LnT-0.3046(LnT)~2 在10,15,20,25℃的培养温度下,从休眠卵孵化出来的孤雌生殖雌体,其繁殖的种群增长曲线都呈“S”形,或称逻辑斯蒂曲线(Logistic curve)。不同的温度,种群达到高峰所需的时间有所不同,温度高者短,低者长;容纳量(carrying capacity)却随温度增加而有所增加。用线性和指数方法计算轮虫种群的生产量所得的结果相似;而与世代时间方法计算所获得的结果相比,差距很大。这种差距随着温度增加而增加。根据本文的研究结果和文献中报道的数据,获得了在0.6—35.2℃温度范围内,卵的发育时间(D)与温度(T)之间的迴归方程: LnD=2.1869-0.1919LnT-0.2218(LnT)~2

Midge larvals from fishing ponds were studied from Apr, 1986 to Jun 1987. Using the methods of collecting specimens with modified Peterson grab and the emergence traps, about two handreds sampling were carried out for the last two years. Specimens were extracted and identified. The data collected are used to show the annual fluctuations in the number of individuals in cohort md its biomass, to describe the population growth by the logistic equation, to determine the intrinsic rate of increase of the population,...

Midge larvals from fishing ponds were studied from Apr, 1986 to Jun 1987. Using the methods of collecting specimens with modified Peterson grab and the emergence traps, about two handreds sampling were carried out for the last two years. Specimens were extracted and identified. The data collected are used to show the annual fluctuations in the number of individuals in cohort md its biomass, to describe the population growth by the logistic equation, to determine the intrinsic rate of increase of the population, to estimate the various components of production for the population of larval of Chironomus attenuatus from Mar to Jun, 1987, in which the actual net production is 1412.33 g/m2 and to give the r'tio as 2.497 of the total production (P) of C.attenuatus to its biomass (B). It does support notice that the presence of fish predators are main reason for a pond's bcnthic decrease in abundance for the period Mny-Jun, 1987.

根据1986年4月至1987年6月,在金州渔场进行的采集研究,摇蚊科幼虫的年消长状况是两个高峰期(5~7月;2~3月)两个低峰期(8~10月;4~5月)。通过逻辑斯帝方程的计算,金州渔场204池摇蚊幼虫种群自然内禀增长率r为0.027;最大持续产量Msy为7.16(个/d);最大持续产量的种群水平NMsy为530(个/d);104池的r值为0.1135;Msy为252(个/d),NMsy为4442(个/d)。针对204池细长摇蚊的跟踪采集,并应用Allen所建方程计算得单位面积的真正净产量为141233(mg/m~2);P/B系数为2497。

 
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