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  forest
    A Study on Forest Soil CO_2, N_2O and CH_4 Emission Flux and Dynamics in Xishan Area, Beijing
    北京西山地区森林土壤中CO_2、N_2O和CH_4气体的排放通量及动态研究
短句来源
    Study on Physico-chemical Property and Health Index of Forest Soil on Badaling Mountain in Beijing
    北京八达岭地区森林土壤理化特征及健康指数的研究
短句来源
    Research on Structure and Function of Soil Animals in Forest Ecosystem in Da Xinganling Mountains
    大兴安岭森林生态系统土壤动物结构及其功能研究
短句来源
    BROWN DESERT FOREST SOIL IN TARIM BASIN
    塔里木盆地的棕色荒漠森林
短句来源
    STUDY ON THE ORGANIC MATTER OF THE FOREST SOILS IN WOLONG NATURAL RESERVE
    卧龙自然保护区森林土壤有机质的研究
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  forests
    Analysis for the Effect of Flood Retaining of Forests and the Suggestions for the Causes of “81.8” Flood Formation and Flood Control in Hanzhong District
    森林拦蓄雨洪作用的分析及对汉中地区81.8洪水成因及防洪治理的意见
短句来源
    The Character of Composition and Distribution on Soil Fauna under Tropical Forests of Xishuangbanna in Rainy Season
    西双版纳热带森林雨季土壤动物群落组成与分布特征
短句来源
    The dynamic change of soil pH value in major forests in Dinghushan
    鼎湖山主要森林类型土壤pH值动态变化
短句来源
    Study on Knowledge and Practice on Function of Conserving Water and Soil of Forests in Ancient China
    论中国古代对森林保持水土作用的认识与实践
短句来源
    Soil NH_4~+/ NO_3~- nitrogen characteristics in primary forests and the adaptability of some coniferous species
    原始森林土壤NH_4~+/NO_3~-生境特征与某些针叶树种的适应性
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  forested
    In the soil water, the concentration of NO_3~--N under the agricultural background was different significantly from that under forested background, with the concentration being 25.8ppm and 8.8ppm respectively;
    在土壤水中,农田背景中硝态氮的浓度和森林背景中有显著差异,浓度分别为25.8ppm和8.8ppm;
短句来源
    no difference was found in the concentration of NH_4~+-N, but the concentration from the agricultural background (3.1ppm) was slightly lower than that from the forested background (3.9ppm) , the concentration of total N (75.3ppm) was higher than that from the forested background (70.4ppm) .
    铵态氮的浓度在两背景中没有明显差异,但农田背景中的浓度(3.1ppm)略低于森林背景中的(3.9ppm); 全氮(75.3ppm)的浓度也高于森林背景值(70.4ppm)。
短句来源
    In the ground water, the concentration of NO_3~--N, NH_4~+-N, total N (0.6ppm, 1.2ppm, and 45.2ppm) under agricultural background were lower than those under forested background(0.8ppm, 1.4ppm, and 48.9ppm).
    在地下水中,农田背景中硝态氮、铵态氮和全氮的浓度(0.6ppm、1.2ppm和45.2ppm)均低于森林背景中的值(0.8ppm、1.4ppm和48.9ppm)。
短句来源
    Study on Construction of V-notch Weirs in Forested Catchments in Xishuangbanna,Southwest China
    西双版纳热带森林集水区测流堰建设的研究
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    Spatial Variability of Characteristic Function of Soil Water Movement on a Forested Hill-slope
    森林流域坡面林地土壤水分运动特征参数空间异质性研究
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  “森林”译为未确定词的双语例句
    Dynamics of Soil Properties and the Effect Factors Among Secondary Successive Communities in Mt.Jinyun
    缙云山森林群落次生演替中土壤特性动态变化及其影响因素研究
短句来源
    A Study on the Soil Genesis and Classification of the Mountain Area in Beijing
    北京山地长石质岩类森林土壤发生分类的研究
短句来源
    Study of the Environmental Background Values of Soil Elements in Xishan Forost Park of Beijing
    西山森林公园土壤元素环境背景值的研究
短句来源
    Gray Relation Grades Analyses and Evaluation of Main Forestry-Soil Fertility in Xiashu Ecological Station
    下蜀主要森林土壤肥力的灰色关联分析与评价
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    Study on Benefits of Soil and Water Conservation by Closing Hill for Afforestation
    封山育林提高森林蓄水保土效益的研究
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  forest
Moreover, a backward reasoning forest of a reachable marking was generated for explicitly representing reachable paths in RBS.
      
Growth Model System for National Continuous Forest Inventory
      
A Growth Model System is developed for data updating and forecasting of the national continuous forest inventory.
      
Its design is based on the inherent forest growth laws, and its parameters are estimated by modern regression methods.
      
It is suitable for forest resource information updating and forecasting for a large region, e.g., a province.
      
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  forests
The ecological water requirement of forests is defined as the water resources used to maintain and improve the natural balance of forest ecosystems, which can be expressed by evapotranspiration of trees during the growing season.
      
With geographic information system (GIS), the ecological water requirement for forests in the Jinghe watershed, western China was estimated.
      
The results revealed that the minimum and suitable ecological water requirements of the forests in the Jinghe watershed were approximately 204×107 and 340×107 m3, respectively.
      
Although the RENIs of plantations in rehabilitated fields are a little lower than those of natural forests, they are higher than those of cultivated crops.
      
Comparative Analysis of Plant Diversity of Pinus tabulaeformis Forests in Ten Regions of Beijing Mountainous Areas
      
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  forested
In order to accurately estimate the size of the carbon pool and the capacity of the carbon sink in the forested areas of Xiaolong Mountain in Gansu Province, we have established regression equations of organ biomass of eight tree species.
      
CWD is an important functional and structural component of forested ecosystems and plays an important role in nutrient cycling, long-term carbon storage, tree regeneration, and maintenance of heterogeneous environmental and biological diversity.
      
Oxidoreductase activity of peat soils as an indicator of the degree of biochemical transformation of drained and forested bogs i
      
Soil peroxidase activity can be an important indicator of the degree of biochemical transformation of drained and forested bogs.
      
Consideration is given to uncertainties related to methods for assessing the above and belowground phytomass and primary production of forest stands in test plots, as well as for extrapolating the results to forested areas.
      
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The constituents of clay minerals in 11 soil profiles of Tibetan highland were identified by chemical analysis, cation-exchange capacity determination, differential thermal analysis and X-ray diffraction.

发育于沉积物、砂岩和页岩残积物的藏北高山草原土、高山草甸土和亚高山草甸土,粘土矿物组成十分相似,各层次之间差异很少,都以云母和伊利石为主,伴有高岭、蛭石以及少量蒙脱和绿泥石,此外在高山土壤的表层则有非晶质水化氧化铁存在,似乎与土壤封冻期长有关。藏南高山土壤与亚高山土壤在粘土矿物组成上有显著不同,千枚岩发育的高山草甸土与藏北土壤接近,但同类母质所发育的亚高山草甸土,除表层可能受坡积物影响,以致云母和伊利石较多外,其余土层中伊利石含量都很低,以结晶较差的高岭为主,并伴有蛭石、三水铝矿和蒙脱,同时还有夹层矿物(12.6A)存在。三水铝矿聚集在剖面上部;而蒙脱则聚集在下部。山地灌丛草原土所处气候条件比较干旱,粘土矿物的主要组成是伊利石、高岭和蛭石,伴存蒙脱而没有三水铝矿,钙积层中蒙脱含量有所增多。喜马拉雅山南坡亚东附近森林植被下花崗岩坡积物所发育的山地灰化土各层都有伊利石、蛭石和高岭存在,此外,在A_2层有大量的蒙脱聚集,在腐殖质淀积层出现显著量的三水铝矿。同类母质所发育的山地棕壤中,粘土矿物组成以伊利石、高岭、三水铝矿、氧化铁矿物为主,蛭石和蒙脱数量甚少。西藏高原土壤中粘土矿物组成随着生物气候条件而发生...

发育于沉积物、砂岩和页岩残积物的藏北高山草原土、高山草甸土和亚高山草甸土,粘土矿物组成十分相似,各层次之间差异很少,都以云母和伊利石为主,伴有高岭、蛭石以及少量蒙脱和绿泥石,此外在高山土壤的表层则有非晶质水化氧化铁存在,似乎与土壤封冻期长有关。藏南高山土壤与亚高山土壤在粘土矿物组成上有显著不同,千枚岩发育的高山草甸土与藏北土壤接近,但同类母质所发育的亚高山草甸土,除表层可能受坡积物影响,以致云母和伊利石较多外,其余土层中伊利石含量都很低,以结晶较差的高岭为主,并伴有蛭石、三水铝矿和蒙脱,同时还有夹层矿物(12.6A)存在。三水铝矿聚集在剖面上部;而蒙脱则聚集在下部。山地灌丛草原土所处气候条件比较干旱,粘土矿物的主要组成是伊利石、高岭和蛭石,伴存蒙脱而没有三水铝矿,钙积层中蒙脱含量有所增多。喜马拉雅山南坡亚东附近森林植被下花崗岩坡积物所发育的山地灰化土各层都有伊利石、蛭石和高岭存在,此外,在A_2层有大量的蒙脱聚集,在腐殖质淀积层出现显著量的三水铝矿。同类母质所发育的山地棕壤中,粘土矿物组成以伊利石、高岭、三水铝矿、氧化铁矿物为主,蛭石和蒙脱数量甚少。西藏高原土壤中粘土矿物组成随着生物气候条件而发生相应的变化。藏北高山带和亚高山带以及藏南高山带气候干冷,土壤中粘土矿物的组成与母质中的相差不多,主要是脱钾和水化作用使云母变为伊利石。藏南亚高山带以下,气候比较温暖,所以,在比较湿润的亚高山草甸土中开始了脱硅作用,形成高岭和三水铝矿;在半干旱的山地灌丛草原土中则形成较多的蛭石。再向南,至湿润温暖的喜马拉雅山南坡山地棕壤中,则有大量的三水铝矿和较多的高岭形成。

The West Tianmu Mountains, located in north-western Zhejiang Province, are among the National Nature Protection Areas in China.According to the data obtained from a number of field observations,soil chemical and physical analyses, clay differential thermal analyses, and X-ray diffraction pattern and microscope electron examinations, it has been found that the soils in this mountain area are of a distinct allitic character,the silica-alumina ratio approximating to 2. Among the clay minerals,kaolinite is dominant,...

The West Tianmu Mountains, located in north-western Zhejiang Province, are among the National Nature Protection Areas in China.According to the data obtained from a number of field observations,soil chemical and physical analyses, clay differential thermal analyses, and X-ray diffraction pattern and microscope electron examinations, it has been found that the soils in this mountain area are of a distinct allitic character,the silica-alumina ratio approximating to 2. Among the clay minerals,kaolinite is dominant, gibbsite being the second in importance. The soils show strong acid reaction, with a high content of active aluminuin. The soil morphological features conform to those of the Yellowish character.According to the soil features and the national conditions, they are considered to belong to the great soil group of the Mountain Yellow Earth.The soils from mountain top to the foot (the altitude of 1507 to 400M.above sea level), can again be divided into three main subgroups: Mountain Bleached-podzolied Yellow Earth, Mountain Surface Glei Yellow Earth and Yellow Earth.We got chances to make observation there twice respectively in the year of 1959 and of 1980. A comparison of the results shows that the forest ecological system there is in a state of dynamic equilibrium. The increase of forest biomass has led to the increase of residues, soilhumus and soil water capacity. The soil base contents are decreased by leaching water. As a result, the soil acidity is increased. The changes of soil property, in turn, have had some effect on the components and structures of the forest colonies.

根据野外调查和土壤理化分析、差热分析。X射线分析等资料,说明西天目山南坡土壤具明显富铝化特征,硅铝率2左右,粘土矿物以高岭石为主,并含较多三水铝矿,酸性强、活性铝含量较高,土壤剖面呈明显的黄化特征,故统属黄壤类土壤。从山顶到山麓又可续分为山地漂灰黄壤、山地表潜黄壤和山地黄壤等亚类。 从1959和1980年两次相距21年的观察和测定,说明西天目山森林生态系统处于缓慢的动平衡中。森林生物群落主组分生物量的增长,导致森林郁闭度、残落物和土壤蓄水量的增长,自然水不断对土壤进行盐基淋洗和酸化作用,而土壤的变化又反过来影响森林群落的组成和结构。

Water plays a very important role in agricultural production in Hainan Island. In this paper, the Island's water budget, involving the precipitation, potential and actual evapotranspiration, water deficit and surplus, moisture index (Im)and dryness index (Ia) from November to April, was worked out on the basis of the climatic classification method developed by Thornthwaite. The results obtained indicate that: (1) The distribution of water assumes an east-west and high-low pattern in Hainan Island. The moisture...

Water plays a very important role in agricultural production in Hainan Island. In this paper, the Island's water budget, involving the precipitation, potential and actual evapotranspiration, water deficit and surplus, moisture index (Im)and dryness index (Ia) from November to April, was worked out on the basis of the climatic classification method developed by Thornthwaite. The results obtained indicate that: (1) The distribution of water assumes an east-west and high-low pattern in Hainan Island. The moisture conditions in the central mountainous area and the eastern part are the best, those in the northern tableland come second and those in the west are the worst. (2) Wet and dry seasons are very distinct throughout the Island, and the water budget is subject to a great change from year to year. It is therefore suggested: xerophilous fruit trees, vegetables and other crops be cultlyated over some area in the west; rubber trees be further planted in areas where they usually grow well; afforestation be widely promoted and irrigation facilities perfected.

水分在海南岛的农业生产中占有重要的地位。本文用桑斯维特的气候区方法计算了海南岛水分收支,包括降水量、可能蒸散量、实际蒸散量、水分亏缺量、水分盈佘量、湿润指数和11—4月干燥指数。分析得出:海南岛的水分条件有东西、高低的分布规律,水分条件以中部山区和东部最为丰富、北部台地次之、西部最差;全岛雨旱两季分明,水分收支年际间变化大。建议在西部地区应发展一定面积的耐旱果菜和耐旱作物;在宜胶地区可继续发展一定面积的橡胶园;广泛营造森林及进一步完善灌溉设施。

 
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