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livestock density
相关语句
  放牧密度
     Based on the results by this model, the coverage of restored vegetation should be less than 50% when vegetation rehabilitation engineering was conducted, and livestock density should be lie between 0.8~2.0 sheep unit/hm~2 in the Ordos plateau.
     根据该文的模拟结果,在进行植被恢复时,恢复植被密度必须低于5 0 % ,放牧密度以0 .8~2 .0个/hm2 羊单位为宜
短句来源
     determined the suitable restoration vegetation coverage and suitable livestock density by the field observation and the model simulation results;
     通过野外观察与模型模拟的方法模拟鄂尔多斯高原恢复植被最适盖度以及最适的放牧密度;
短句来源
  “livestock density”译为未确定词的双语例句
     LIVESTOCK DENSITY EFFECT ON REPRODUCE VITAL LIVESTOCK RATE IN QINGNANPASTURE
     青南牧区草地载畜量对放牧家畜繁活率的影响
短句来源
  相似匹配句对
     switching the density;
     进行密度换算;
短句来源
     Density (calc. )
     计算密度D_(calc.)
短句来源
     LIVESTOCK DENSITY EFFECT ON REPRODUCE VITAL LIVESTOCK RATE IN QINGNANPASTURE
     青南牧区草地载畜量对放牧家畜繁活率的影响
短句来源
     The livestock industry and the environment
     畜牧业与环境(续完)
短句来源
     The livestock industry and the environment
     畜牧业与环境
短句来源
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  livestock density
Controls on livestock density, the length of the grazing season and recreation activities are proposed, which we suggest would facilitate vegetation recovery.
      
The whole farm approach is illustrated with a case of two dairy farms with contrasting livestock density and grassland management.
      
Changing from intensive to extensive conventional dairy farming with a livestock density equal to that in the organic scenario resulted in a reduction in N-surplus ha-1 of 15%.
      
In Part two, a positive correlation between livestock density and N-surplus ha-1 was found for dairy farming.
      
The most profitable farms were those with either high overall livestock density or a high level of Iberian pig production.
      
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etrangeland refers to natural rangeland perennially or seasonally accumula.ted with water. According to the First National Rangeland Resources Survey,veral types of wetrangeland including marsh,marsh-meadow,lowland meadowand alpine marsh--meadow are identified as habitats and reproduction places formigratory and water birds.Of the total 24 million ha of wetrangeland in China,the majority are inhabited by waterbirds.Of them 18 species are categoried asthe first grade national protected birds and over 40 species...

etrangeland refers to natural rangeland perennially or seasonally accumula.ted with water. According to the First National Rangeland Resources Survey,veral types of wetrangeland including marsh,marsh-meadow,lowland meadowand alpine marsh--meadow are identified as habitats and reproduction places formigratory and water birds.Of the total 24 million ha of wetrangeland in China,the majority are inhabited by waterbirds.Of them 18 species are categoried asthe first grade national protected birds and over 40 species as the second gradenational protected birds. About 100 species of birds are listed on the Sino--Japanese or Sino--Australian Agreements on the Protection of Migratory Birds inhabitedand reproduced in these wetrangelands.Wetrangelands are among those with thehighest hay yield,highest carrying capacity,and highest utilization rate in China.Most of them are mowing rangeland or important winter and spring rangelandfor livestocks overwintering.With increase of both population and livestock density,the utilization rate of these wetrangelands is increasing.Morever,the areaof the waterbirds inhabited places is decreasing due to human interference andinvasion of the rangeland.Suggestions concerning the strengthening rational utilization of the rangeland and wetrangelans,rational utilization and management ofwetrangelands and eco-environmental protection are raised accordingly.

湿草地是终年积水或季节性积水的天然草地.在我国湿草地觅食、或栖息、繁殖的国家一类保护鸟类18种、国家二级保护水禽有40余种,还有上百种属于中日、中澳候鸟保护协定规定保护的鸟类.根据80年代全国首次统一草地资源调查结果,中国有可供水禽,徙禽栖息、繁殖的沼泽、沼泽化草甸、低湿地草甸、高寒沼泽化草甸等各类湿草地2400×104hm2,其中大部分有水禽分布.湿草地是我国各地产草量最高,载畜力最高,利用率较高的草地类型,大多是割草场或牲畜越冬的重要冬春放牧场.本文简述了随着人口和牲畜密度的增加,人们对湿草地的利用日益加重,不断地干扰、侵占、缩小水禽栖息地的状况,以及农业部兴建的有关珍稀水禽栖息的湿草地自然保护区概况,提出了加强湿草地的合理利用与管理,保护水禽栖息的良好生态环境的建议.

From relevant analysis,livestock density effect on reproduce vital livestock rate have been researched in Qingnan pasture. The result shows that annual dynamics of live stock density belongs to be hovering, down, up up -down and down -up -down grass land type. Aberrance modulus of reproduce vital livestock is under15%. Aberrance modulus of reproduce vital livestock is between 15%-32%when livestock belongs to down, up down and down-up -down grassland type.

采用相关分析方法,研究了青南牧区草地载畜量对放牧家畜繁活率的影响,结果表明:草地载畜量年动态可归属徘徊、下降、上升、升降和降升降型。载畜量属徘徊和上升型草地,放牧家畜繁活率变异系数在15%以下;载畜量属下降、升降和降升降型的草地,放牧家畜繁活率变异系数在15.01%~32%之间。

Two main factors hinder the effective incorporation of ecological information from computer models into resource management at large spatial scales: (1) some models are not based on ecologically sound principles; (2) most models based on sound principles are too sophisticated or detailed. This paper presents a generic model based on well established ecological principles with an appropriate level of detail to better server sustainable resource management decision making. The model was developed to simulate seasonal...

Two main factors hinder the effective incorporation of ecological information from computer models into resource management at large spatial scales: (1) some models are not based on ecologically sound principles; (2) most models based on sound principles are too sophisticated or detailed. This paper presents a generic model based on well established ecological principles with an appropriate level of detail to better server sustainable resource management decision making. The model was developed to simulate seasonal and annual growth, foliage projective cover (FPC), and evaporative coefficient in the Ordos plateau, where serious desertification happened recently. The value of k is based on the relations between precipitation, evapotranspiration, drainage and soil moisture and derived by iterative method when plant community, soil moisture and precipitation reached the equilibrium point. Other parameters of plant community were calculated by well validated empirical equations. Observed NPP data in the study area were used to validate the model, and the model results were in high agreement with observed data. The model was used to simulate evaporative coefficient, FPC, and annual production in the study area. The simulation results indicate that the k parameter is lower than 0.35×10~(-2) and implies a typical dry climate in study area. Estimated foliage projective cover of plant community is lower than 50%, and the annual production is very low——less than 1 t/(hm~2\5a) in most of sites. About 90% of annual NPP was produced during May to August (four months). Based on the results by this model, the coverage of restored vegetation should be less than 50% when vegetation rehabilitation engineering was conducted, and livestock density should be lie between 0.8~2.0 sheep unit/hm~2 in the Ordos plateau.

影响大尺度空间生态模型模拟结果与资源管理整合的因素主要有两种:一是一些模型生态学意义不明确,二是一些模型所需要的生态输入信息过于复杂。建立一个基于基本的生态学公理且输入较为简单的生态学模型,便于更加有效地服务于资源环境管理。该模型用于模拟发生严重荒漠化的鄂尔多斯高原植物群落的季节及年生长、叶片投影盖度、蒸发系数。模型首先基于降雨、蒸散、渗漏及土壤水分特性与蒸发系数(k)的关系,采用迭代的计算方法,模拟植物群落蒸散与土壤可利用水分达到平衡状态时的k值,进而采用得到广泛验证的经验公式计算植物群落的其它参数。野外N PP观察数据对模型的验证表明:模拟结果与观察值相符较好。模拟结果表明:蒸发系数小于0 .35×10 - 2 ,显示鄂尔多斯高原气候较为干燥;叶片投影盖度低于5 0 % ;除东部的准格尔旗外,植物群落净第一性生产力均低于1t/(hm2·a) ,近90 %的N PP累积集中于5至8月份。根据该文的模拟结果,在进行植被恢复时,恢复植被密度必须低于5 0 % ,放牧密度以0 .8~2 .0个/hm2 羊单位为宜

 
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