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   stocking rates 的翻译结果: 查询用时:0.195秒
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stocking rates
相关语句
  放牧率
     Influences of Stocking Rates on C,N,P Contents in Plant-Soil System
     不同放牧率对草原植物与土壤C、N、P含量的影响
短句来源
     Behavior Ecology of Grazing Sheep Ⅱ Influence of Stocking Rates on Foraging Behavior of Wether
     放牧绵羊行为生态学研究Ⅱ不同放牧率对放牧绵羊牧食行为的影响
短句来源
     The experiments results showed that the amount of fresh feces decrease and the rate ofdry matter (DM) in the feces increased with the stocking rates increase at the same grazingperiods, but thpre was difference significantly only between the treatment of 1- 33 sheep/hm2 138 days and 6. 67 sheep / hm2. 138 days;
     实验研究表明,绵羊在同一放牧时期,随着放牧率的增大,鲜粪量有所减少,粪中干物质含量有所增大,但只有处理1.33羊/hm2·138天与6.67羊/hm2·138天问存在显著性差异。
短句来源
     The yearly changes of biomass composition for desirable herbage were negatively correlated with stocking rates (P < 0.01), and the yearly changes of biomass composition for weeds were positovely correlated with stocking rates (P<0.01).
     两季草场优良牧草生物量组成的年度变化与放牧率均呈负相关(P<0.01),与杂类草均呈正相关(P<0.01)。
短句来源
     Variations of water-soluble carbohydrate and nitrogen contents in Leymus chinensis and Phragmites communis under different stocking rates
     不同放牧率下羊草和芦苇可溶性碳水化合物和氮素含量的变化
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  “stocking rates”译为未确定词的双语例句
     The net primary production were increased by stocking rate. They were 1210. 9, 1076. 4, 987. 9 and 555. 2 g/m under stocking rates 69%, 55%, 45% and no grazing. As the same, the perennial ryegrass were 899. 8, 777. 0, 746. 0 and 372.0 g/m2;
     在放牧采食率为69、55、45%和不放牧条件下,人工草地地上净第一性生产力分别为1210.9、1076.4、987.9和555.2g/m2,其中多年生黑麦草的地上净第一性生产力分别为899.8、777.0、746.0和372.0g/m2。
短句来源
     The cover degree average biomass and stocking rates of grassland in Ningxia Hongsipu decreased by 40% ,32.3% and 53.5% respectively than that in 1982. Grassland grade, species of plants in communities and saturation degree decreased significantly.
     宁夏红寺堡草场较1982年覆盖度下降40%,平均生物产量降低32.3%,载畜量下降53.5%,草场等级、群落内植物种数、种饱和度均明显减少。
     (4)The utilization efficiencies of light energy from total solar radiation to digestible energy of sheep in the grazing system of Stipa breviflora desert steppe were 0.219% and 0.067%in stocking rates 2 and 3 sheep/hm 2/half year,respectively.
     (4)短花针茅草原绵羊放牧系统从太阳总辐射能量到绵羊消化能量的能量利用效率以载畜率 2只羊 / hm2 /半年为最大 ,可达 0 .2 19% ,以载畜率 3只羊 / hm2半年为最小 ,仅为 0 .0 6 7%。
短句来源
     the aboveground community biomass declined with increased stocking rates and in the aboveground biomass compositions of various functional groups,shrubs dominated,occupying 68% of the aboveground community biomass in the control,77.40% of the aboveground community biomass under light grazing,73.25% of the aboveground community biomass under medium grazing and 76.91% of the aboveground community biomass under heavy grazing;
     群落的地上生物量随载畜率的增加而降低,各功能群地上生物量组成中,灌木类处于主体地位,分别占据了群落68%(CK)、77.40%(LG)、73.25%(M G)、76.91%(HG)的生物量;
短句来源
     The stocking rates of tilapia were in five levels ranged from 0~8.12kg·m -3 . The results indicate that the biomass of blue green algae, Clrysophyta,Rotatoria,Ciadocera and Copepoda, the pH and the ratio of TN to TP declined with the increase of tilapia biomass.
     罗非鱼的放养量为 5个水平 (0~ 8.12 kg· m-3 )。 结果表明 ,随着罗非鱼放养量的增大 ,蓝藻、金藻、轮虫、枝角类、桡足类的量、p H、和 TN:TP比值下降 ;
短句来源
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  相似匹配句对
     And the ruminating circle increased at the lower stocking rates.
     载畜率对反刍行为有明显影响,轻度、中度放牧区绵羊反刍周期数多于重度放牧区。
短句来源
     Monitoring grazing practices and stocking rates for sustainability
     可持续放牧方法和载畜量的监测系统(英文)
短句来源
     Christmas Stocking
     圣诞袜
短句来源
     The Dr rates of E.
     coli的耐药性不同 ,尿中E .
短句来源
     The Christmas Stocking
     圣诞袜的来历
短句来源
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  stocking rates
Defining the intensity of grazing under continuous stocking or rotational grazing is complex due to the different stocking rates and the heights of sward during a grazing season.
      
Two groups of animals representing each age category were turned out onto pasture on 24 May 1997 and grazed at comparable stocking rates.
      
Intensification of animal husbandry methods including increased stocking rates and application of slurry to pasture may increase the hazards of gastrointestinal helminthiasis.
      
The effects of 16?years of continuous browsing by goats in a South African savanna at stocking rates intended for bush control were compared with plots unbrowsed for the same period of time.
      
On the basis of the model, the root responses to grazing of KBU grassland have been studied under different conditions of stocking rates and precipitation.
      
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Three varieties of carp were chosen as parental stocks for cross breedings:mirrorcarp of the scatter-scaled type (MCS),fully scaled red carp (RC),and the Long-chow mirror carp (LMC).Hybrid offspring (F_1) were reared in coexistence withthe inbred offspring at the same stocking rate and in the same pond.By the end ofthe first growing season the average individual weight of the offspring of MCS(?)×RC♀ was 50—60% heavier than the inbred RC,and that of MCS(?)×LMC♀ was57% heavier than the inbred LMC,meanwhile...

Three varieties of carp were chosen as parental stocks for cross breedings:mirrorcarp of the scatter-scaled type (MCS),fully scaled red carp (RC),and the Long-chow mirror carp (LMC).Hybrid offspring (F_1) were reared in coexistence withthe inbred offspring at the same stocking rate and in the same pond.By the end ofthe first growing season the average individual weight of the offspring of MCS(?)×RC♀ was 50—60% heavier than the inbred RC,and that of MCS(?)×LMC♀ was57% heavier than the inbred LMC,meanwhile the survival rate of both hybrids wereas high as the inbred ones.Regarding the inheritance of scale-covering and body coloration,the resultsof our experiment indicate that the scattered scale-covering,and the red coloration aswell,is a recessive character.The second generation (F_2) derived from the self-crossof the hybrid (F_1) of MCS(?)×RC♀ should,theoretically,have 8 genotypes and 4phenotypes.The occurrence of the 4 phenotypes have actually been realized,amongwhich the red mirror carp (scatter-scaled,red coloration) has been a new recombina-tion,distinct from F_1 hybrid and from either parent in external appearance.Thescalation pattern and the body coloration of the red mirror carp seem to be theresult of homozygosis of the two recessive genes.Rearing experiment shows that thered mirror carp has a growth rate superior to MCS or RC.It is to be expected thatit should be relatively stable in inheritance and would emerge,as a new,economicvariety of the carp.

本研究希望通过鲤鱼品种间杂交出现的杂种优势来提高鲤鱼的产量以及在杂种的后代中选择具有优良的经济性状的类型培育出新的鲤鱼品种。两组杂交的杂种一代具有明显的杂种优势,可以直接应用于渔业生产上并可望获得增产效果。根据对鳞被和体色的遗传特性的研究结果断定散鳞镜鲤与兴国红鲤的杂种二代中出现的红色镜鲤的鳞被和体色是由纯合型隐性基因控制的,可以预期它的后代不再出现分离而可能成为一个稳定的新品种。研究了不同品种及其杂种的血清蛋白聚丙烯酰胺盘状电泳图谱,希望借此作为一种选种的工具。

The feeding habit,age and growth,and the propagation of the mud carp,Cir-rhinus molitorella,has been studied.And suggestions concerning its culture have beenmade accordingly.The mud carp feeds mainly on phytoplankton.When water temperature is bet-ween 16.4℃ and 29.4℃,the fish have a strong appetite,above and below this tem-perature feeding declines.Most fish cease to eat at a dissoved oxygen level of 0.24—0.65 mg/l,and when the oxygen level exceeds 0.99 mg/l the feeding of the mudcarp becomes quite active.The...

The feeding habit,age and growth,and the propagation of the mud carp,Cir-rhinus molitorella,has been studied.And suggestions concerning its culture have beenmade accordingly.The mud carp feeds mainly on phytoplankton.When water temperature is bet-ween 16.4℃ and 29.4℃,the fish have a strong appetite,above and below this tem-perature feeding declines.Most fish cease to eat at a dissoved oxygen level of 0.24—0.65 mg/l,and when the oxygen level exceeds 0.99 mg/l the feeding of the mudcarp becomes quite active.The age of the fish was determined according to the disposition of the circuli ofthe scales.New circuli are formed between March and November,which denote thegrowing period of the fish.Among the fish examined,the largest female had a body-length of 595 mm,wei-ghing 4,100 g,10 years of age;the largest male's body-length was 580 mm,weighing3,850 g,9 years of age.The correlation between body-length and body-weight is calculated for 261 fishfrom Yu-kiang River and for 382 pond-reared fish.Pearl-organs appear on the head and pectoral fins of the mature male duringApril through July.The females have none.The sex ratio of the 1,119 fish examined was about 1∶1.But when the fish weredivided into different size-groups,it was found that the proportion of the maledecreased as the size increased.The seasonal changes of the ovaries and the testes of the pond-reared mud carpwere studied.And the gonadal development of the pond-reared mud carp was com-pared with that of the mud carp caught from Yu-kiang River.It is found that the mud carp is capable of natural spawning in the Da-wang-tan Reservoir.During the years of 1962—1964,the spawning grounds of the mud carp inYu-kiang River were investigated.The ecological conditions for spawning include:water level rises rapidly (0.37—2.12m within 24 hours),the velocity of currentincreases markedly,and the water temperature ranges between 25.9 and 29.6℃.The minimum size for sexually mature individuals are as follows:fish from Yu-kiang River,female 273 mm,525 g,male 275 mm,415 g;pond reared fish,female247 mm,366 g,male 235 mm,291g.According to the data obtained from 28 fish,the fecundity for river fish is 84 eggs/g body-weight,and 139 eggs/g body-weight for pond reared fish.The embryonic development is divided into 4 stages and 26 periods while thepost-embryonic development,8 stages.Induced spawning has been successfully carried out from early-May until mid-June,with the water temperature from 22℃ to 29℃.Spawning takes place 4.5 to6 hours after the injection of pituitaries or gonadotropins.According to the experiences of the fish-farmers,in ponds for poly-culture ofvarious fish,a stocking rate of 1,000 fingerlings of the mud carp to each mou(666m~2) is suitable,the number of the silver carp (Hypophthalmichthys molitrix)fingerlings stocked should be kept at one-third that of the mud carp.In pondswhere the mud carp is intended to be the main object,a rate of 1,500—2,000 permou is desirable.

本文对鲮鱼的食性、年龄、生长和繁殖进行了研究,并对渔业生产提出了建议。鲮鱼以浮游植物为主要食料。在水温14.6—29.4℃时食欲旺盛。当水中溶氧量0.24—0.65毫克/升时,绝大部分个体停止摄食,而溶氧量在0.99毫克/升以上时,摄食强度很大。见到的最大个体:雌鱼体长595毫米,体重4,100克,10龄;雄鱼体长580毫米,体重3,850克,9龄。鲮鱼能在大王滩水库中自然繁殖。鲮鱼人工繁殖季节以5月初至6月中旬较适宜;催产时水温以22—29℃为好,注射催产剂的效应时间一般为4.5—6小时。见到的性成熟最小个体:郁江鲮鱼雌体长273毫米,体重525克,雄体长275毫米,体重415克;池养鲮鱼雌体长247毫米,体重366克,雄体长235毫米,体重291克。根据群众经验,一般池塘中鲮鱼每亩放养1,000尾,鲮与鲢的放养比例以3∶1较好,以鲮鱼为主体的池塘则每亩放养1,500—2,000尾较好。

Based on a fishery-biological survey of the Yao-Jiang River, ZheJiang Province, carried out during 1976-1977, the writer delineates the ecological properties of fish population and estimates the fish-producing capacity of this river.With the construction of dams across the River, the latter takes up some characteristics of a reservoir. The new environmental condition, especially the richness of plankton, is favorable to the development of freshwater fishery.There are 58 species of fish in the Yao-jiang River,...

Based on a fishery-biological survey of the Yao-Jiang River, ZheJiang Province, carried out during 1976-1977, the writer delineates the ecological properties of fish population and estimates the fish-producing capacity of this river.With the construction of dams across the River, the latter takes up some characteristics of a reservoir. The new environmental condition, especially the richness of plankton, is favorable to the development of freshwater fishery.There are 58 species of fish in the Yao-jiang River, with species composition similar to that of the lakes along the lower reaches of the Chang Jiang River. Owing to the practice of stocking, the fish community in the River is now a semi-artificial one. Population of bighead, silver carp, grass carp, black carp and blunt-snout bream are formed by artificial stocking; while common carp, crucian carp, Erythroculter dabryi, Acanthobrama simoni, Salangidae, Coilia ectencs, etc. represent the natural population. There is no serious interspecific competition, and these species are mainly supplementary in their interaction with reference to the utilization of spatial and temporal dimensions and food resources of the water body.The annual fish yield of the River from 1971 to 1976 averages 48.1 jin per mu, of which 65% are stocked species, 35% are natural population. And among the stocked species, bighead and silver carp constitute an overwhelming part. By making comparisons on the food resources, the growth rate and the population structure of fishes between the Yao-jiang River and the Qing-shan Reservoir in Hangzhou, Zhejiang Province as well as the Dong-hu Lake in Wuhan, Hubei Province, the writer points out that: (1) The plankton resources in the Yao-jiang River have not been fully utilized, and the stocking rate of silver carp should be higher than in the Tung-hu Lake and not less than that of the Qing-shan Reservoir, then the annual yield of silver carp and bighead put together would increase from the present 30.3 jin to over 60 jin per mu. (2) The food resources of grass carp, blunt-snout bream and black carp still remain to be brought into fuller utilization, but the potentiality of increasing the yield of these consumers seems rather limited. (3) The yield of natural fish stock such as the common carp, crucian carp, etc. has been more or less steady in recent years, and if due attention is paid to protective measures and to the natural proliferation of the stock, their production in the River may rise to a higher level. Accordingly, by rational stocking, by fuller utilization of food organisms as well as by protection of the natural fish stock, coupled with the improvements of fish screen installations, the yearly fish yield of the Yao-jiang River should in all likelihood reach the level of 80 jin per mu or so (around 600kg per hectare).

本文根据1976-1977年的调查研究,讨论姚江鱼类种群生态特点,并参照对杭州青山水库的一些调查及中国科学院水生生物研究所对武昌东湖的研究,估量姚江的鱼产力,旨在为拟定增产措施提供科学根据。

 
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