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forest border
相关语句
  林缘
     forest border has a positive one; and the results show that the artificial planting area should be limited to 4hm 2,if the effective distance of provenance disturbing was chosen 120m.
     研究表明 ,林分密度产生负效应 ,林缘产生正效应 ,以 12 0 m作为种源干扰的有效距离指标 ,人工造林面积应控制在 4 hm2 左右比较适宜
短句来源
  “forest border”译为未确定词的双语例句
     The following results were shown: the breadth of the forest border is between 20 meters and 65 meters in this region.
     结果表明:该地区主要森林群落边际带的宽度范围在20—65m 之间。
短句来源
     During the winter, the thermal effect was more obvious on the rubber forest border than in the forest deeps. The temperature of the forest border was 2 ℃ higher than that of in the forest deeps.
     冬季胶林边行热效应较明显,比林内树温高2℃左右,若加充分利用对防寒有一定意义。
短句来源
  相似匹配句对
     forest .
     林。
短句来源
     Broken Chapters Written on the Border of the Forest
     写在森林边上的断章
短句来源
     The Catcher on the "Border"
     “边缘”里的守望者——“风入松”首届福州青年国画家邀请展有感
短句来源
     ELF IN FOREST
     森林之灵
短句来源
     Border and Imagination
     边界与想象
短句来源
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  forest border
The tree stands are not restricted to any specific habitat, and occur within an area stretching 650?km westwards from the current forest border of Southern Tibet.
      
Factors that inhibit tree establishment within the shrubland, as well as factors that affect shrub establishment within the forest border likely affect the `permeability' of this ecotone.
      
Population age structure was determined in 10 m wide transects established perpendicular to the plain-forest border.
      
The four upper forest border chronologies all show an anomalous increase in growth since the late 19th century, and an apparent change in climate control of ring growth.
      
There are, however, significant correlations between the low-frequency components of the upper forest border chronologies in the different ranges, consistent with their containing a growing season temperature signal on decadal time scales.
      
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The biological effects of the community structure of one artificial rubber forest were observed with the modern instruments and the traditional microclimate observations. The variation regularity of some ecological factors was preliminarily discussed. It was observed that the temperature of rubber trees and the sunlight intensity at the experimental locality were closely related. In Xishuan-banna, the rubber tree temperature of facing southwest part is higher than that of facing northeast part. The highest temperature...

The biological effects of the community structure of one artificial rubber forest were observed with the modern instruments and the traditional microclimate observations. The variation regularity of some ecological factors was preliminarily discussed. It was observed that the temperature of rubber trees and the sunlight intensity at the experimental locality were closely related. In Xishuan-banna, the rubber tree temperature of facing southwest part is higher than that of facing northeast part. The highest temperature difference between W and N parts of rubber trees was 1 ℃. The temperatures of the surface and shallow parts of the rubber trees were directly and obviously influenced by the sunlight intensity. And the influence was gradually reduced to the deeper parts of the rubber trees. The core parts of the rubber trees were indirectly influenced by the sunlight intensity. But they were not only influenced by the environment but also subjected to the regulations of the rubber trees themselves. During the winter, the thermal effect was more obvious on the rubber forest border than in the forest deeps. The temperature of the forest border was 2 ℃ higher than that of in the forest deeps. This kind of temperature difference may be used in the cold prevention on artificial rubber forest. Since the temperature of rubber trees is different from the air temperature. While the air temperature changes relatively limited. This difference of temperature variation is favourable to the normal growth of plants. It is proposed that to measure the temperature of rubber trees can be used in the observation of cold injury. It is useful to cultivate some tea trees in rubber forest to increase the forest temperature in winter. It is not an ideal method of cold prevention to apply a black coating on the trunks of rubber trees because the increase of the temperature on the forest border is not much obvious in winter. Moreover, if such method to be used in rubber forest deeps, there would be a tendency of slight decrease of the temperature which may increase the cold injury to rubber trees.

采用近代仪器与传统小气候观测相结合的方法,研究了人工胶林群落结构的生物学效应;对若干生态因子变化规律进行了初步讨论。胶树体温与测试地日照强弱密切相关。西双版纳树温西南高,东北低,西向与北向最高温之差约为1℃;树表和浅层受日照影响直接而明显,随深度增加而减弱,树心比较间接,既受环境影响又受本身机体调节。冬季胶林边行热效应较明显,比林内树温高2℃左右,若加充分利用对防寒有一定意义。树温和气温有差别,气温变幅大,树温变幅小,有利于植物正常生活,建议直接测定树温观察寒害。胶林中适当种植茶树,冷季有增暖效果,能对轻度寒害起缓冲作用。涂黑树干法不是理想防寒措施,因边行增温不明显,况且密林深处有轻微降温趋势,可能导致寒害加重。

This paper compares three methods——computerized simulativevariable plot,angle counting,criusing and tally.An experiment of point sampling with different basal area factors (F) was conducted.The results indicated that it is unbiased to estimate basal area of stand but inefficient when estimating stems per hectare by point sampling.The bias in estimation results from lower counting of trees,unsuitable F,the effect of forest border or ect..Further,this paper presents several technical suggestions on how to...

This paper compares three methods——computerized simulativevariable plot,angle counting,criusing and tally.An experiment of point sampling with different basal area factors (F) was conducted.The results indicated that it is unbiased to estimate basal area of stand but inefficient when estimating stems per hectare by point sampling.The bias in estimation results from lower counting of trees,unsuitable F,the effect of forest border or ect..Further,this paper presents several technical suggestions on how to prevent bias when using point sampling.

利用计算机模拟角规、角规观测和每木实测的方法,进行了不同角规常数的点抽样试验比较。结果表明:点抽样估计林分断面积是无偏的,而估计林分每公顷株数效率不高。点抽样的偏差主要是因漏计、角规常数选择不当,林缘效应等原因引起的。同时,还就如何防止点抽样产生偏差的技术措施提出了一些建议。

Gitpinia massoniana is a new forest pest occurred in Changchong Forest Farm of Chu County, Anhui Province, whose major host is Pinus massoniana. According to the survey conducted in May, 1991, the area infested by the pest was about 9000mu. It has 2 generations a year. It pupates under the litter, in the root part of the grass or in the soil from mid-June to early July and from late October to mid-November, and aestivatea and hibernates by prepupa. The larva has 6 instars, feeding on an average of 573.1 cm of...

Gitpinia massoniana is a new forest pest occurred in Changchong Forest Farm of Chu County, Anhui Province, whose major host is Pinus massoniana. According to the survey conducted in May, 1991, the area infested by the pest was about 9000mu. It has 2 generations a year. It pupates under the litter, in the root part of the grass or in the soil from mid-June to early July and from late October to mid-November, and aestivatea and hibernates by prepupa. The larva has 6 instars, feeding on an average of 573.1 cm of the needle during the period of lst~5th instar. After entering into the 6th instar, the larva feeds on nothing and makes cocoon in 5 hours to 2 days. The sex ratio of the adults is 1:1. After mating, the female lays eggs on the needles, the average number of an egg mass is 87.6. It mainly distributes in the pure P. massoniana forest of 20~30 years old, especially in the sparse forest and forest border. The pest can be effectively controlled by 10% Fenvalerate or 10% Mevinphos.

马尾松吉松叶蜂(Gilpinia massoniana Xiao)发生于安徽省滁县长冲林场,主要危害20~30年生马尾松纯林,疏林、林缘受害严重。1991年5月调查,发生面积达9000亩。一年发生两代,6月中旬至7月上旬,10月下旬至11月中旬老熟幼虫在枯枝落叶层下、草丛根部、土壤中结茧,以预蛹越夏、越冬。幼虫共6龄,1~5龄食叶量平均573.1 cm,第6龄不取食,经5~48 h结茧。一、二代幼虫危害期分别在5月上旬至7月上旬和9月中旬至11月中旬。幼虫雌性比0.5。雌成虫交尾后将卵散产于松针中,产卵量平均87.6粒。

 
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