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   林木生产力 的翻译结果: 查询用时:0.484秒
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林木生产力
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  tree productivity
     Tree productivity and water production potential in Returning Farmland to Forest Project in Datong County, Qinghai Province
     青海大通退耕还林工程区林木生产力和水分生产潜力研究
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  “林木生产力”译为未确定词的双语例句
     It is to determine the best soi I conditions of Larix olgensis plantation by researching the relationship of the soil environment conditions to plantation productivity. These index are not only the criterion of choice the best site for Larix olgensis plantation, but also the standard of checking the decline of the current forest productivity.
     通过研究长白落叶松分布区内的土壤环境条件与林木生产力之间的关系,确定培育长白落叶松人工林的最适宜土壤条件,这些指标既是营造长白落叶松人工林立地选择的标准,又是检验现有林立地生产力下降的依据。
短句来源
     By our measurement, the difference between the largest and the least growth increment of the volume of Beijing Populus at different gravel content localities can be as great as ninefold.
     本区同一地域上的林木生产力随砾石含量而变化很大,据我们测定,不同砾石量立地上的北京杨,其材积生长量差异达9倍之多。
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  相似匹配句对
     A STUDY ON CLIMATOLOGICAL ESTIMATION OF THE FOREST TREES PRIMARY PRODUCTIVITY IN THE DABIE MOUNTAINOUS AREA
     大别山区林木第一性生产力的气候学估算
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     Creative productivity
     创意生产力
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     The productivity of root system of forest trees can be estimated and calculated according to the fractal model.
     根据分形模型可以估算林木根系的生产力
短句来源
     Estimation for property of forest-crop.
     林木资产评估
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     science as the productive forces ;
     科学是生产力 ;
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  tree productivity
Higher values of tree productivity combined with lower annual moss productivity were found in sites in northern taiga in comparison with forest-tundra.
      
Recurring cork extraction is a major stress factor and the large water loss from the stripped trunk surface may affect the water balance and tree productivity.
      
To assess the potential impacts on tree productivity, stomatal regulation was investigated in Douglas fir with chronic stomatal occlusion and defoliation from varying levels of the Swiss needle cast (SNC) fungus, Phaeocryptopus gaeumannii.
      
Tree productivity and water potential productivity in returning farmland to forest project in Datong County, Qinghai Province
      
Part 1: Long-term effect on maize, cassava and tree productivity
      
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The middle reaches region of the Yalutsangpo River, or the one river and two tributaries (the Lhase River and the Nianchu River) region, is a major developing and artificial afforestation region. According to our field survey, there are 75 296ha waste land in the region, including 29 911 ha (39.70% of the whole waste land) which are suitable to forests. On the basis of the locality, conditions, the gravel content and other factors, we divide the waste land into 4 locality types and 4 soil types. The largest...

The middle reaches region of the Yalutsangpo River, or the one river and two tributaries (the Lhase River and the Nianchu River) region, is a major developing and artificial afforestation region. According to our field survey, there are 75 296ha waste land in the region, including 29 911 ha (39.70% of the whole waste land) which are suitable to forests. On the basis of the locality, conditions, the gravel content and other factors, we divide the waste land into 4 locality types and 4 soil types. The largest locality type is the pebble beach, and next are the moving dunes and the sloping fields of drift sand. The major soil type is the sand land. The area of fertile soil is 15.24% of the whole waste land, and the annual increment of the forest on this kind of soil can reach more than 5.5m3/ha. In the same part of the region, the productive capacity of the forest change violently with the gravel content. By our measurement, the difference between the largest and the least growth increment of the volume of Beijing Populus at different gravel content localities can be as great as ninefold. Therefore, soil reclamation is one of the most important problem of afforestation in the region.According to the conditions of the region, the utilization of the waste land suitable to forest is primarily to plant fuel forests and windbreak forests in order to get the benefits of fuel and protection. The development of the waste land suitable to forest may be divided into three steps. During the Eighth Five Year Plan, first we should chiefly levelop the waste land suitable to forest in Aimagang and Jiangdang, grasp the construction of the 3357 projects, dredge the Nianchu River and contruct the forests and grassland zone successively, afforest the waste land and the sand in the Yalutsangpo River valley step by step, levote major efforts to make shelter forest network and make forestry to play a better role in developing the national economy.

西藏雅鲁藏布江中游地区,或称“一江两河”地区是西藏的重点开发区和人工造林重点地区。据我们野外调查勾绘,本区河谷地区现有荒地资源 75 296ha,其中宜林荒地29 911ha,占荒地资源的39.70%。根据立地条件及砾沙含量等因子,我们将本区宜林荒地分成4种立地类型和4种土壤类型。在各立地类型中,以河谷卵石滩地为多,其次为流动沙丘及流沙坡地;宜林荒地的土壤类型则主要是沙地,土壤肥力较好的壤化粉砂土和壤土仅占 15.24%,其林木年生长量可达 5.5m~3/ha 以上。本区同一地域上的林木生产力随砾石含量而变化很大,据我们测定,不同砾石量立地上的北京杨,其材积生长量差异达9倍之多。因此,土壤改良是本区造林工作中的重要问题之一。根据本区条件,宜林荒地的利用主要是营造以薪柴和防护效益为主的薪炭林和防风固沙林,因地区而异;宜林荒地的开发可分三期进行,“八五”期间主要开发艾马岗、江当宜林荒地,认真搞好“3357”工程建设,进一步搞好年楚河的整治和林草带建设,逐步绿化雅江荒地沙滩,大力做好防护林网的建设工作,使林业在国民经济发展中起到更大的作用。

The productivity and nutrient cycling of 19- year-old Chinese fir plantations in different site conditions were studied in a small watershed located in Fenyi County, Jiangxi Province. The watershed was divided into three parts: rideg, slope and foot of a hill, for which soil physical and chemical properties were completely different. Significant differences in productivity and nutrient cycling were found under these site conditions. Main conclusion is as follows;1. The tree biomass in ridge,slope and foot,was...

The productivity and nutrient cycling of 19- year-old Chinese fir plantations in different site conditions were studied in a small watershed located in Fenyi County, Jiangxi Province. The watershed was divided into three parts: rideg, slope and foot of a hill, for which soil physical and chemical properties were completely different. Significant differences in productivity and nutrient cycling were found under these site conditions. Main conclusion is as follows;1. The tree biomass in ridge,slope and foot,was 68.337 4 t/ha, 99.162 9t/ha, 141.140 3 t/ha,respectively. The tree biomass at the ridge was 48.4% of that at the foot, and the average individual biomass of the ridge was only 14.95% of that at the foot. That means the ridge is not suitable for the growth of Chinese fir.2. The effect of site condition on growth begins from infant stage(1-4) and arrives the biggest in fast growing stage ( 5~12 ) , then gradually declines.3. The amount and rate of element accumulation, return, absorption and cycling follow the order: ridge's

以江西省分宜县山下林场的杉木人工林为研究对象,分析比较了山脊(包括坡上部)、山坡、山洼(包括坡脚部分)杉木林的生产力和养分循环状况。三种生境条件下的生产力(生物量)依次为68.337、99.163、141.140t/hm~2,山脊的林木生物量仅为山洼的48.4%,林木平均胸径仅为7.8cm(19年生),经济价值很低。此外,由于山脊恶劣的水肥条件,林木各器官中的养分含量、林分养分的吸收和循环均处于较低的水平。集水区的山洼以及坡下部林木的生产力水平较高,达到或接近了杉木中心产区(如湖南、福建)速生丰产林分的生产力水平。养分含量、养分循环速率也较高。研究认为,杉木分布区域中的丘陵地带,多形成独立的或相连的凹形小集水区,集水区之脊、坡、洼三种生境差异显著,在林业生产中应分别对待,坡上部及山脊应种植以保持水土恢复地力为目的的阔叶树种,坡中下部及山洼种植经济价值较高的杉木。

Growth process and differentiation features of Armandi pine trees were studied by method of stem and branch analysis,using destructive sampling. The results show clearly that tree crown expansion goes into rapid growing period after 8 years,getting stationary after 24 year,also its diameter growth,height growth,volunle and biomass turn into rapid growing period after 12 a,10 a,and 16 a,respectly.Stems differentiate fiercely during its rapid growing period,and in this period Armandi pine forests should be tended...

Growth process and differentiation features of Armandi pine trees were studied by method of stem and branch analysis,using destructive sampling. The results show clearly that tree crown expansion goes into rapid growing period after 8 years,getting stationary after 24 year,also its diameter growth,height growth,volunle and biomass turn into rapid growing period after 12 a,10 a,and 16 a,respectly.Stems differentiate fiercely during its rapid growing period,and in this period Armandi pine forests should be tended so that their productivity can be improved.

通过破坏性取样和树干、枝条解析,研究了华山松林木的生长过程和分化特点。结果表明,树冠扩张在8龄以后进入速生期,24龄后逐渐趋于平稳;直径生长在12龄以后进入速生期;高生长在10龄以后进入速生期;材积及生物量在16龄后进入速生期。进入速生期后,林木分化严重,应及时采取抚育措施,以提高华山松林木的生产力。

 
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