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middle and young forest
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  “middle and young forest”译为未确定词的双语例句
     It is suggested that controlling this disease should be put stress on the middle and young forest under 10m.
     防治该病的重点应放在林分平均高不超过10m的中、幼龄林。
短句来源
  相似匹配句对
     In the Middle
     人在中途
短句来源
     middle contradiction;
     存在中间矛盾;
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     ,and the middle thickness was 50?
     , 中 间 的 垒 厚 50?
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     BEAUTIFUL MIDDLE YANDANG
     中雁之美
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     YOUNG W.
     YOUNG W.
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Oa the basis of the author's long-time research experiences on Chinese fir and a great number of literatures published,the research results in the fields of physiology, ecology, genetic breeding, afforestation and forest management and so on for Chinese fir are summarized. The features on the development of Chinese fir research in the past 10 years are as follows.(1) The research on the basic theory of Chinese fir has been reinforced, for example, research on biology, genetic variance, fine seeds selecting...

Oa the basis of the author's long-time research experiences on Chinese fir and a great number of literatures published,the research results in the fields of physiology, ecology, genetic breeding, afforestation and forest management and so on for Chinese fir are summarized. The features on the development of Chinese fir research in the past 10 years are as follows.(1) The research on the basic theory of Chinese fir has been reinforced, for example, research on biology, genetic variance, fine seeds selecting and breeding, physiological and ecological traits, productivity of plantations and nutrient circulation etc.(2) Some fruits of basic research on Chinese fir management have been achieved, for example, the district classification of Chinese fir growing regions, stand sorting system, and site index table constructing etc.(3) The research methods have developed gradually from determining the nature to determining quantity and position, for example, quantisation site index table, forest density management diagram etc. Obtained.(4) A complete set of the technical measures for Chinese fir afforestation have been established gradually and have been systematized.Generally speaking, the research on Chinese fir is still being at the beginning stage, many other productive techniques have not been resolved completely yet, some research projects need further study, some areas have remained unexplored.From now on, following fields on the Chinese fir research need deep study.(1) There are a large amount of the middle and young forests with very low yield per unit area now, what measures should be taken for improving the yield?(2) Fine seeds selecting and breeding should be suited to the requirements for the variable stands and their different applications, and at the sametime should take the responding cultural technology.(3) The soil fertility of the Chiness fir stands has been failing seriously, what shall we do to keep the Chinese fir fast-growing with high yield constantly?(4) In order to offer theoretical base for building a new cultural system, we should study in the fields of the species selecting, disposing, their level constructing and nutrients circulating from the view point of ecological system.

根据作者长期研究及大量的有关文献,综述了建国以来我国杉木研究的动态和进展。指出近期以来,杉木研究特点是基础学科的理论及其基础性研究均有所加强并取得一批成果,研究方法逐步从定性走向定量,造林、营林技术开始配套形成系列和标准化,今后研究宜着重于提高现有中、幼林的单产,选育适应于不同立地、不同培育目标的高产品系,抗性育种,杉木人工林生态系统养分循环和林地的持续利用及建立新的栽培体系等。同时建议加强研究协作,成立全国的杉木研究中心或研究协会。

According to the investigation of main forest factors on 26 typical plots and the observation of climatic factors and ascospores dispersion way lasting 2—3years,the results analysed with different mathematical methods show that the disease incidence of Korean pine needle cast decreases along with higher elevation and elder forest age, and increases with thicker forest density.By means of the analysis of soil nutrition and pH value,it is indicated that the disease occurrence is not significantly related with...

According to the investigation of main forest factors on 26 typical plots and the observation of climatic factors and ascospores dispersion way lasting 2—3years,the results analysed with different mathematical methods show that the disease incidence of Korean pine needle cast decreases along with higher elevation and elder forest age, and increases with thicker forest density.By means of the analysis of soil nutrition and pH value,it is indicated that the disease occurrence is not significantly related with nutrition of forest land. The dispersing amount of ascospores is controlled by climatic factors. ≤23℃ daily mean temperature, ≤90% daily mean relative humidity, and≤24 mb daily absolute humidity are the optimum conditions of ascospores dispersion. When the daily precipitation is≤0.5mm, the ascospores dispersion is restrained. It is suggested that controlling this disease should be put stress on the middle and young forest under 10m.

本文通过26块典型样地的调查和2—3年的固定样地气候、Lophodermium maximum子囊孢子飞散规律的观测,其数据经不同的方法处理,结果表明:红松落针病的发生随海拔增高、林龄增加感病程度下降,而随林分密度增大感病程度上升。通过对土壤养分含量及pH值分析,表明:落针病的发生与林地养分含量的多少关系不大。L.maximum子囊孢子的飞散主要受气候因子控制,日均温度≤23℃、日均相对湿度≤90%、日均绝对湿度≤24mb时是子囊孢子飞散的最适时机。日降雨量≤0.5mm时对孢子的飞散有抑制作用。防治该病的重点应放在林分平均高不超过10m的中、幼龄林。

The proportion of middle and young forests in the TBCuninghamia lanceolata forests of Guanshan Forest Farm is great. According to the characteristic,the farm selected good provenance forests and clonal forests in its middle and young forests to breed large diameter timber by improvement felling since 1999. Through 3 years of survey the results showed that the average annual growth of volume amounted to more than 15 m~3/hm~2.

根据杉木中幼林占有比重大的特点,选择其中立地条件好的优良种源林或无性系造林的中幼林分,通过抚育间伐以培育成大径林,经3a的检测结果表明,间伐后林分每公顷立木蓄积年均生长量达到15m3以上。

 
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