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middle aged forest
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  “middle aged forest”译为未确定词的双语例句
     Principle and Methods for Tending Thinning of Secondary Young and Middle Aged Forest in Xiaoxing′an Mountains
     小兴安岭天然次生幼壮林抚育的基本原则和主要方法
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  相似匹配句对
     The Barbie's Middle-aged Crisis
     芭比娃娃惊觉中年危机
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     The Effects of Aerobics on the Middle-aged
     健美操对中年人健康的影响
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     In the Middle
     人在中途
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     middle contradiction;
     存在中间矛盾;
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     forest .
     林。
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A increment of main forest communities in the forest region of the Daxingan mountain is discussed by means of checking up 23 plots which were set up in 1954. For young forest of form, Larix gmelinii, the current annual increment is, 5.94m~3/ha; the mature forest is 0.90m~3/ha and overmature forest is -0.11m~3/ha; the middle-aged forest of Pinns sylvestris var. mongolica 2.53m~3/ha; the mature and overmature forest 1.34m~3/ha; the forest of Betula platyphylla...

A increment of main forest communities in the forest region of the Daxingan mountain is discussed by means of checking up 23 plots which were set up in 1954. For young forest of form, Larix gmelinii, the current annual increment is, 5.94m~3/ha; the mature forest is 0.90m~3/ha and overmature forest is -0.11m~3/ha; the middle-aged forest of Pinns sylvestris var. mongolica 2.53m~3/ha; the mature and overmature forest 1.34m~3/ha; the forest of Betula platyphylla 1.55m~3/ha and forest of davurica 1.70m~3/ha. The author indicates that attending felling should be speedily exploited or annual loss would be 1100 million yuan Per year.

本文根据复查的23块1954年设置的标准地材料,分析了大兴安岭林区主要森林群落的生长规律。兴安落叶松中龄林的年净生长量为5.94m~3/ha,成熟林为0.90m~3,过熟林为-0.11m~3;樟子松中龄林为2.53m~3,成过熟林为1.34m~3;白桦林为1.55m~3;黑桦林为1.70m~3。作者指出,对该区的中龄林应进行抚育采伐,成过熟林应强化开采,否则,每年将损失11亿元。

In the middle-aged forest of pine (Pinus armandii), the distribution characteristics of diameter of raindrop was measured and calculated. The relationships between Kinetic energy of per unit precipitation and intensity of rainfall, and among kinetic energy of raindrop and precipitation and its intensity, were revealed. The results proved that throughfall has greater kinetic energy of per unit precipitation, while the height of canopy is over 7 meters, that canopy can not effectively diminish...

In the middle-aged forest of pine (Pinus armandii), the distribution characteristics of diameter of raindrop was measured and calculated. The relationships between Kinetic energy of per unit precipitation and intensity of rainfall, and among kinetic energy of raindrop and precipitation and its intensity, were revealed. The results proved that throughfall has greater kinetic energy of per unit precipitation, while the height of canopy is over 7 meters, that canopy can not effectively diminish the kinetic energy of rainfall when storm, heavy rain and rainfall with middle intensity occur. To prevent, forest soil from erosion compound storied forest should be planted, especially litter layer should be protected.

本文测算并分析了华山松中龄林林内雨滴直径的分布特点,单位雨量的动能与降雨强度的关系;降雨过程中降雨动能与降雨量、降雨强度的关系。研究结果证明,当华山松林冠层下限高度超过7米时,林内透过降雨具有较大的单位雨量动能;在中雨、大雨和暴雨情况下,林冠层不能有效地降低降雨动能;要使林地土壤免除水蚀危害,应使林分构成复层结构,保护下木和活地被物,特别应注意保护林地上的枯枝落叶层。

Based on the method of the grey connected analysis in the grey system theory, the author analysed the relation among the height, diameter of black locust and the main chemical factors of soil: HCO3-, C-~, SO24-, Ca2+ Mg2+, K++Na+, the total amount of anion, saliferous amount of soil and pH value. The order of arrangment of chemical factors is as follows according to their connected degrees (l)on the height of tree: pH, SO24-, HCO3-, Mg2 + , Ca2 + , the total amount of anion, Na++K+, Cl~, saliferous amount of...

Based on the method of the grey connected analysis in the grey system theory, the author analysed the relation among the height, diameter of black locust and the main chemical factors of soil: HCO3-, C-~, SO24-, Ca2+ Mg2+, K++Na+, the total amount of anion, saliferous amount of soil and pH value. The order of arrangment of chemical factors is as follows according to their connected degrees (l)on the height of tree: pH, SO24-, HCO3-, Mg2 + , Ca2 + , the total amount of anion, Na++K+, Cl~, saliferous amount of soil} <2)玭 the diameter of tree. pH, SO24-, HCO3-, Mg2+ , Ca2+ the total amount of anion, CI-, Ma+ + K+, saliferous amount of soil. The results show that pH value is the most important chemical factor of soil which can influence the growth of middle aged forest of black locust on the sea shore, but not the salt amount of soil. Our research effects can be used as a theory for soil amendment and improvement of the quality of afforestation on the sea shore.

本文利用灰色系统理论中的关联分析方法,对滨海土壤化学因子与刺槐中龄林生长的关系进行了定量和定性分析。在所分析的9个土壤化学因子中,对刺槐中龄林的直径和树高生长影响最大的是土壤pH值,其次为SO_4~(2-)离子含量,再次为HCO_3离子含量,影响程度最小的因子是土壤含盐量。

 
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