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locust forest
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  刺槐林
     Study on Water and Density Growth Effect of Locust Forest at Semiarid Region on Loess Plateau
     黄土高原半干旱区人工刺槐林水分密度生长效应研究
短句来源
     The rat density was 44. 86%, 14. 61%and 3. 17%respectively in locust forest,weeds and wheat fields. EHF virus dead hamsters were only present on the surface of the expressway, with traces of vehicle crushing.
     夹夜法调查刺槐林、杂草地、麦田的鼠密度分别为 44. 86%、14.61%及 3. 17%.
短句来源
     Influence of Black Locust Forest Improvement on the Water Situation of Forestland
     刺槐林更新改造对林地水分环境的影响
短句来源
     At last, the total transpiration of black locust forest during the period of 1998 and 2000 in the growth season of May to October, as an average transpiration of the different density stands, were 192 46, 187 07 and 195 59? mm respectively.
     由全年连续日蒸腾模拟计算 ,1998年至2 0 0 0年 5月~ 10月生长季不同密度刺槐林的平均总蒸腾量分别为 192 4 6 ,187 0 7和 195 5 9mm .
短句来源
     The analysis results pointed out, thepractical productivity of locust forest in gully slope land approached climate productivity, it insunless slope land was 60. 11% of climate productivity, and it in sunny slope land only was2. 5% of climate productivity.
     分析表明陇东黄土高原为壑区南小河沟流域4种主要立地条件类型中,沟坡刺槐林的现实生产力已接近气候生产力,阴山坡为气候生产力的60.11%,阳山坡仅为气候生产力的2.5%。
短句来源
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  人工刺槐林
     Study on Water and Density Growth Effect of Locust Forest at Semiarid Region on Loess Plateau
     黄土高原半干旱区人工刺槐林水分密度生长效应研究
短句来源
  刺槐
     Based on the field monitoring data, the daily transpiration, monthly transpiration, water requirement and their season changes of black locust forest with 1.5 m×6 m, 1.5 m×3 m density in Fangshan County runoff forest field were studied using Penman-Monteith equation, combining with the data of weather observation and water surface evaporation.
     通过对人为给水和自然水分条件下的1.5m×6m和1.5m×3m密度的刺槐(Robiniapseudoacacia)林的林地蒸发和林木蒸腾定位观测,并结合气象观测资料和水面蒸发观测结果,应用Penman-Monteith方程对该林分日、月蒸腾量和需水量及其季节变化进行了估算。
短句来源
     Study on Water and Density Growth Effect of Locust Forest at Semiarid Region on Loess Plateau
     黄土高原半干旱区人工刺槐林水分密度生长效应研究
短句来源
     The rat density was 44. 86%, 14. 61%and 3. 17%respectively in locust forest,weeds and wheat fields. EHF virus dead hamsters were only present on the surface of the expressway, with traces of vehicle crushing.
     夹夜法调查刺槐林、杂草地、麦田的鼠密度分别为 44. 86%、14.61%及 3. 17%.
短句来源
     Modeling of the daily transpiration variaton in locust forest by Penman-Monteith equation
     刺槐日蒸腾过程的Penman-Monteith方程模拟
短句来源
     Influence of Black Locust Forest Improvement on the Water Situation of Forestland
     刺槐林更新改造对林地水分环境的影响
短句来源
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  “locust forest”译为未确定词的双语例句
     Therefore, the thinning intensity with remaining density of 1110 individuals·hm -2 was optimum for black locust forest in this region.
     因此 ,1110株·hm-2 左右的保留密度是可考虑的间伐强度 .
短句来源
     Study on the relationship of soil hydraulic conductivity in artificial locust forest and its environmental factors on loess gullied-hilly region
     黄土丘陵沟壑区人工刺槐林地土壤导水性与其外界环境关系的研究
短句来源
     Probe into Reasonal Density or Locust Forest in Semi-arid Area of East Gansu Province
     陇东半干旱地区刺槐水保林合理密度分析与探讨
短句来源
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The site types were classfied according to enviromental factors in this paper. Both of the relationships between soil water and other enviromental factors, and between the mean height of dominant trees and some factors of site (topography, the type of lithic and the soil type utilized) were analysed with quantitative theory I . The results showed major factor influncing the growth of local artificial forest of locust (Robinia pseudoacacia L. ) was soil water condition affected mainly by local topographic factors....

The site types were classfied according to enviromental factors in this paper. Both of the relationships between soil water and other enviromental factors, and between the mean height of dominant trees and some factors of site (topography, the type of lithic and the soil type utilized) were analysed with quantitative theory I . The results showed major factor influncing the growth of local artificial forest of locust (Robinia pseudoacacia L. ) was soil water condition affected mainly by local topographic factors. A table of local soil water class and forecasting equation of mean height of dominant trees of artificial locust forest with base age were established in this paper. A table of the site types suit for this region and a site map within the area of 1335.0 hectares were made as well

此项研究根据环境因子划分立地条件类型,用“数量化理论Ⅰ”分析了土壤水分与其它环境因子之间,以及刺槐人工林地的优势木平均树高与林地某些因子(地形、黄土母质类型和造林前的土地利用类型)之间的关系。结果认为,土壤水分因子是影响当地刺槐人工林生长的主导因子,而土壤水分状况主要受当地地形因素的影响。提出了该地区土壤水分等级表,和刺槐人工林标准林龄优势木平均树高的预测方程式。并编制了适合该地区的立地条件类型表,绘制了1355.0公顷面积范围内的立地图。

The characteristics of black locust forest for firewood were studied. The results are summarized briefly as follows: Black locust grows fast on light soil on hill slopes facing south or half south in semiarid areas. The root system develops horizentally to 3×12m~2. The yield of firewood from the ravine facing south is higher than that from hillsides facing south or other directions after the planting. Firewood yield may increase if the hilldes are closed to facilitate afforestation. As for har-...

The characteristics of black locust forest for firewood were studied. The results are summarized briefly as follows: Black locust grows fast on light soil on hill slopes facing south or half south in semiarid areas. The root system develops horizentally to 3×12m~2. The yield of firewood from the ravine facing south is higher than that from hillsides facing south or other directions after the planting. Firewood yield may increase if the hilldes are closed to facilitate afforestation. As for har- vesting method, short interval clear-cutting (at the interval of 2~3years) is recommended. Black locust sprouts easily. When the trees of twelve years are cut, each plant may sprout 9.6 shoots on average. The firewood after cutting has a low water content (29%) and is combustible when moist. Its caloric value is higher than that of poplar or willow trees. The forest can be renewed easily with suckers.

发展薪炭林是尽快解决农村能源有效的途径之一,1983年经对凌源、建平刺槐薪炭林特性的测试表明:刺槐在半干旱地区的阳坡半阳坡薄土层山地生长较快,8年生进入材积速生期,水平根系发达,根幅3×12米~1,产柴量;朝南沟谷地高于半阴半阳坡地;造林后封山育林明显高于不封山育林;采用短周期平茬高于其它采柴方式。刺槐萌芽力强,12年生树平茬后平均每株发萌条9.6根,薪柴含水率较低(湿柴含水29%);易燃,湿柴就可做燃料,热值高于杨、柳树。

Using the hydraulic data of soil observed during two years in site and the basic principles of the soil physics, the paper systemtically analyses soil hydraulic conductivity of plant Locust forests in the loess gulliedhilly region of Longdong. Surface infiltration intensity and unsaturated hydraulic conductivity in soil were survied by means of soil moisture rearrangement. Through selecting infiltration model, Philip's formula(1957) [i(t)=1/2st~(-1/2)+A] has been determined as optimum model in the areas....

Using the hydraulic data of soil observed during two years in site and the basic principles of the soil physics, the paper systemtically analyses soil hydraulic conductivity of plant Locust forests in the loess gulliedhilly region of Longdong. Surface infiltration intensity and unsaturated hydraulic conductivity in soil were survied by means of soil moisture rearrangement. Through selecting infiltration model, Philip's formula(1957) [i(t)=1/2st~(-1/2)+A] has been determined as optimum model in the areas. In order to examine real infiltration capacity in a rain, we simulated infiltration causes under different rain patterns. Moreover, the soil hydraulic conductivity K(θ) may be presented using parameter a and parameter b of soil moisture rearrangement. We have obtained the result that moisture volume percentage is linear with a and b, all correlation coefficients are more than 0.9. Finally, relationship between the soil hydaulic conductivity and main effect factors were also analysed using typical correlaton analysis. According to the above analysis, we could conclude that a great stand should recreate an intensive improvement for the soil hydraulic conductivity, otherwise,a very week improvement on the one hand, its improvement effects are in close relationship with landforms and plain where the stand was planted on the other hand.

本文应用土壤物理学的基本原理,根据两年定位观测的土壤水文资料,对陇东黄土高原沟壑区人工刺槐林地土壤的导水性进行了较为系统的分析和研究。在实验中应用土壤水分再分布法,实测了地表的入渗能力和土体内部的非饱和导水能力。模型选择结果表明,该地区土壤的入渗过程符合菲利普(Philip)方程: i(t)=1/2St~(-1/2)+A 所表示的入渗规律。为了判断实际降雨时地表的入渗情况,确定了S值和积水前时间t_P的计算方法。根据霍顿(Horton)产流理论,用微机模拟计算了不同雨型下的入渗过程。土体内部的导水性可以由土壤导水率K(θ)来表示,而K(θ)又完全可以由土壤水分再分布参数a、b反映出来。拟合结果表明,θ与a、b(θ=at~b)的相关系数在各测点上均在0.9以上。最后,应用典型相关法分析了土壤导水性与各环境因子之间的关系。分析结果证明,林龄较大的林分对土壤的导水能力有较强的改善作用,而林龄较小的林分的这种作用很弱。同时,这种作用的强弱与林分配置的地貌部位有密切的关系。

 
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