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protective forest
相关语句
  防护林
     Orchard in coastal areas in Taizhou of Zhejiang, established by protective forest, cold decrease wind speed by 36.8%-70.3%, fruit drop by 38.2%-60.5%, increase air humidity by 1%-3%, decrease evaporation by 13.7%, improve ecological environment of orchard, promote tree growth, increase output by 11.7% -18.8% per 0.07 hectare.
     沿海围涂果园,采用“窄带小网型”防护林营建技术,能降低风速36.8%~70.3%,减少落果38.2%~60.5%,提高空气湿度1%~3%,减少蒸发量13.7%,改善果园生态环境,促进果树生长,从而提高产量(每0.07hm~2提高11.7%~18.8%),该技术宜于南方滨海果园推广。
短句来源
     Study on protective forest resources in Pingtan is land using SPOT and Landsat ETM+ image
     SPOT和Landsat ETM+卫星影像结合下的平潭岛防护林资源遥感研究
短句来源
     The results of research on community structure characteristics and biological productivity of man-made Acacia dealbata protective forest in Toutang mountain area in Jinshajiang river watershed indicated that the biomass and productivity of Acacia dealbata plantation of 5 years attain 4200t/hm2 and 830t/hm2 respectively.
     对金沙江流域头塘山地圣诞树人工防护林群落的结构特征与生物生产力的研究结果表明:5年生的圣诞树人工林具有较高的生物量和生产力,其值分别为4200t/hm2和830t/hm2·a。
短句来源
     The results were as followed. The ratio of the area and volue of protective forest were 47.13% and 89.41% respectively, while those of the plantation were 0.40% and 0.29%.
     结果表明,防护林面积和蓄积量分别为47.13%、89.41%,用材林仅为0.40%、0.29%,林种组成不合理。
短句来源
     ANALYSIS AND EVALUATION OF SOIL WATER CONDITIONS OF PROTECTIVE FOREST ECOSYSTEM IN LOESS AREA
     黄土地区防护林生态系统土壤水分条件的分析与评价
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  “protective forest”译为未确定词的双语例句
     Different protection effects of protective forest appeared at different daytime,with the greatest at 14∶00 and smallest at 2∶00, and the average windspeed reduced 13.3%.
     每天不同时间防风效应不同 ,14∶0 0最大 ,2∶0 0最小 ,平均为 13 .3 % .
短句来源
     Construction of GIS Forest Themes and its Application to Stream Protective Forest Planning
     GIS林相专题图的建立及在护岸公益林规划中的应用
短句来源
     Annual average increase of total biomass of four protective forest is: poplar> water fir> Chinese cryptomeria> black locust.
     林分总生物量年均增长量则是杨树林(6年)>水杉林(22年)>柳杉林(17年)>刺槐林(32年),分别是刺槐林的2.98倍、1.66倍、1.36倍,表明杨树林分总生物量积累速度最快,刺槐最慢。
短句来源
     Waterpower and wind power erosion accounting for 68.39% and 48.45% respectively. So constructing protective forest and returning land for farming to forest and grass are the key measures to prevent soil erosion.
     水力侵蚀与风力侵蚀强度侵蚀以上所占比例分别为 68.39%和 48.45 %。
短句来源
     The quadratic regression revolution design was applied in the experiment and mathematical model of two controllable factors and volume increment of Platycladus orentalis were established in this paper Through analysis of the model the optimixation version for comprehensive nurture was worked out data culd be provided for management of soil and water conservation protective forest
     运用二次回归旋转设计法建立了 2个可控抚育因子与侧柏水土保持林材积增量的数学模型 ,通过模型分析 ,提出了侧柏水土保持林综合抚育的优化方案 ,为侧柏水土保持林合理经营提供了信息。
短句来源
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  相似匹配句对
     forest .
     林。
短句来源
     The influence of protective forest systems on noise
     防护林体系对噪声的影响
短句来源
     The Developing Tendency of Protective Forest in China
     我国防护林的发展趋势
短句来源
     Prince of forest
     “森林骄子”鄂伦春
短句来源
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  protective forest
Understanding these pedoecological effects may aid in the design of protective forest systems in arid and semi-arid areas.
      
Revitalization of an alpine protective forest by fertilization
      
The results confirmed common assumptions on ideal properties of a protective forest stand against rockfalls.
      
However, much is still unknown about the ideal properties of protective forest stands.
      
Predicting equations of main factors affecting regional climate in the "Three-North" protective forest area
      
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Constraction of protective forest in Hexi corridor is considered a major one among all the projects in the northwest, north China and northeast.The grasses interplanted with trees under the forestation belt not only raise soil fertility and promont the growth of trees but also enrich the forage grass and bring about a great advance in animal husbandry in rural area.The studies on the fertility different types of soils have been performed with sampling for examination and test and using statistical analysis...

Constraction of protective forest in Hexi corridor is considered a major one among all the projects in the northwest, north China and northeast.The grasses interplanted with trees under the forestation belt not only raise soil fertility and promont the growth of trees but also enrich the forage grass and bring about a great advance in animal husbandry in rural area.The studies on the fertility different types of soils have been performed with sampling for examination and test and using statistical analysis matched by comparison from 1983 to 1985,The results show that there have been a remarkable influence upon content of soil organic matters and effective potassium,in particular,and also upon the total nitrogen and nitrogen hydrolysate.As for effective phosphorus, such effects have not been found yet during the2—3 year of grass growing.

西北、华北,东北防护林建设的重点工程是在河西走廊建设农田防护林。实行林带种草对于提高土壤吧力、促进林木生长效果良好,还可扩大饲草来源,促进农区畜牧业的发展。本文报道作者1983—1985年期间对河西走廊农田防护林带种草的调查研究。对种草林带不同类型土壤的肥力状况采样化验,并用配对比较法统计分析结果表明;林带种草对土壤有机质含量的影响显著;对全氮含量的影响极显著:对水解性氮的影响极显若;对有效钾的影响显著;林带种草2—3年内,对有效磷含量的影响还不显著.

Based on the dryness and rainfall in connection with temperature,geomorphology and crop indexes, agricultural zones (without pure livestock zone) in the arid and semiarid areas in China can be divided into such four zones and 9 subzones as the sub-semiarid and moderate agricultural zone on the low plateau in Northeast and Northwest China; the semiarid, warm and cool agricultural zone on the medium plateau in the northern part of China; the arid,moderate, irrigated and Oasis agricultural zone in Northwest China...

Based on the dryness and rainfall in connection with temperature,geomorphology and crop indexes, agricultural zones (without pure livestock zone) in the arid and semiarid areas in China can be divided into such four zones and 9 subzones as the sub-semiarid and moderate agricultural zone on the low plateau in Northeast and Northwest China; the semiarid, warm and cool agricultural zone on the medium plateau in the northern part of China; the arid,moderate, irrigated and Oasis agricultural zone in Northwest China and the dry and cool agricultural zone on Qinghai and Xizang Plateau. In determing the developing orientations of agriculture, forestry and livestock in each zone, such multiple factors should be taken into consideration as biomass, a quantity of products, productive value, ratio between labourers and funds, markets and trade, etc. Apart from the agricultural zone in the castern part of Qinghai Prowince and the eastsouthern part of Xizang, Qinghai and Xizang plateau is the livestock zone. In the dry and irrigated zone where light, heat and water conditions are fine, and there is also great productive potential, priority can be given to the development of agriculture in combination with livestock, and developing forest should be based on the consideration of limited water supplies. In the sub-semiarid ahd moderate zone where temperature and moisture conditions are moderate, and there are much more lands, agriculture, forest and livestock hold great protential in their development. Thus, priority should be given to the development of agriculture in close connection with agriculture, livestock and forest. Also, the principles of" subsistence agriculture, protective forest and low commodity livestock" must be exercised.In the semiarid, warm and cool zone where natural conditions are very hard, and the yields of agriculture and livestock are low but unstable, also, priority has to be given to agriculture in close connection with sheep raising, and importance must be attached to the protection of ecological environment. The above mentioned subsemiarid and moderate zone and sub-semiarid and cool zones cover nearly almost of the loess plateau in China.Therefore, in view of controlling the Yellow River and affecting agricultural development in the middle and lower reaches of the Yellow River, efforts should be made to strive for food selfsufficiency in this region, while energetically encoraging to plant trees (arboreous trees and shrubs) and grasses is of great strategical importance.

根据干燥度、降水量、结合温度,同时辅之以地貌、作物等指标。可将我国干旱半干旱农区(不包括纯牧区)分为东北西北低高原亚半干旱温和农区,北部中高原半干旱凉温农区,西北干旱温和和灌溉绿洲农区,青藏高原旱凉农区及9个亚区。确定各地区农林牧的发展方向,应考虑农林牧各业的生物量、产品量、产值、劳动与资金占有比例、市场、贸易等多种因素。青藏高原,除青东和藏东南农区外,主要是牧业地区。干旱灌溉区,光热水条件好,潜力大,可实行以农为主、农牧结合,发展林业应考虑水分供应的限制。亚半干旱温和区,温度水分条件中等,土地较多,农林牧发展都有潜力,应以农为主,农林牧结合,实行“自给性农业,保护性林业与低商品性牧业”。半干旱凉温农区,自然条件严峻,农牧业低而不稳,今后仍应以农业为主,发展养羊业,注意保护生态环境。以上亚半干旱温和区和亚半干旱温凉区几乎包括了我国黄土高原的绝大部分,从对黄河治理和黄河中下游农业发展的影响考虑出发,这一地区在力争粮食自给的同时,大力提倡种树(乔灌木)种草则具有重要的战略意义。

Through observing the meteorological effects on the coastal shelterbelts(or netss)from Beihai to Hepu of Guangxi,three structures of the forest belts on their lee side from different dis- tances were studied.The forest meteorological elemental effects,such as wind velocity,temperature,air humidity,evaporation and soil tem- perature also were studied,from this study,the relative wind velocity, resisting wind effect and protective distance of the belts as well as a model of wind velocity forcast in strong typhoon...

Through observing the meteorological effects on the coastal shelterbelts(or netss)from Beihai to Hepu of Guangxi,three structures of the forest belts on their lee side from different dis- tances were studied.The forest meteorological elemental effects,such as wind velocity,temperature,air humidity,evaporation and soil tem- perature also were studied,from this study,the relative wind velocity, resisting wind effect and protective distance of the belts as well as a model of wind velocity forcast in strong typhoon and constant wind speed were obtainded.At the end of this paper,a suggestion was made about how to set up and reform a protective forest shelterbelt or net.

通过对广西北海——合浦沿海防护林带(网)气象效应的观测,分析了紧密、疏透和通风三种结构防护林带背风面不同距离的风速、气温、空气湿度、蒸发和地温等森林气象要素效应,得出它们的相对风速、防风效能、防护距离和有效防护距离,以及在强台风和常凤影响下的风速预报模式。并提出建设和改造防护林带(网)的具体建议。

 
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