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initial planting
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  初植
     Re-sults show that the different initial planting densities (1.5 m×1.0 m, 1.5 m×2.0 m and 1.5 m×2.5 m) had significant effects on wood density and MOE, and the highest mean wood density and indexes of mechanical properties occurred in the stand with an initial planting density of 1.5 m×1.0 m.
     初植密度(1.5m×1.0m,1.5m×2.0m和1.5m×2.5m)对木材密度和抗弯弹性模量有显著的影响。 初植密度为1.5m×1.0m时,木材主要力学指标值最大。
短句来源
     For Cunninghamia lanceolata plantation with different initial planting density, annual average growth rate of basal area and volume of low-density stands was more than that of high density. It showed that the basal area and volume of low density gradually approached to those of high density.
     对不同初植密度的人工杉木林分进行断面积和蓄积的研究,发现不同初植密度对杉木林分的断面积和蓄积的生长有一定的影响,初植密度大的林分断面积和蓄积年平均生长率要小于初植密度小的林分,说明初植密度小的林分有向初植密度大的林分渐近的趋势。
短句来源
     A study was conducted to determine the influences of initial planting densities, thinning intensities, exposures and slope sites on physical property (wood density) and mechanical properties such as modulus of elasticity (MOE), bending strength, impact strength, com-pression strength along grain and hardness) of Pinus sylvestris var. mongolica plantation in Mao’ershan Forest Farm, Northeast China.
     研究了不同培育措施(初植密度、间伐强度、坡向、坡位)对人工林樟子松(Pinus sylvestris var.mongolica)木材的密度和力学性质(横纹抗弯强度、抗弯弹性模量、顺纹抗压强度、冲击韧性、端面硬度)的影响。
短句来源
     According to the analysis of volume and economic benefit, the optimum initial planting density and rotation are determined.
     同时经过经济效益分析,得出了最佳初植密度和最佳采伐年龄。
短句来源
     Based on the results of compatible biomass models, the research calculated biomass of different parts aboveground of Larix olgensis plantation and compared individual biomass difference with different thinning intensity and initial planting density.
     本研究利用相容性生物量模型的研究成果,对长白落叶松地上各部分生物量进行了计算,然后比较了不同间伐强度和初植密度对林分各部分生物量影响的差异。
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  “initial planting”译为未确定词的双语例句
     Study on the Initial Planting Density of Industrial Timber Stands of Slash Pine and Loblolly Pine
     湿地松、火炬松工业用材林造林密度初步研究
短句来源
     Therefore,reasonable thinning of the plantation can be an effective way for well development of undergrowth vegetation Generally,when the plantation with initial planting density of 2 500~3 000 trees·hm -2 grows up to 10 years old,the reasonable retained stand density should be 1 500~2 000 trees·hm -2 and the canopy density should be 0 6~0 7 after thinning.
     通过间伐适当调整密度是促进林下植被发育的有效方法 ,造林密度为 2 5 0 0~ 30 0 0株· hm-2的一般林分 ,10年生以后林分密度应保持为 15 0 0~ 2 0 0 0株· hm-2 ,郁闭度保持为 0 .6、0 .7即可取得较好的效果。
短句来源
     AN APPLIATION OF GREEN CORRELATION AND CALCULATION ANALYSIS ON THE DETERMINING SUITABLE INITIAL PLANTING AND DENSITY ADJUSTMENT OF PINUSSYLVESTRIS LINN VAR MONGOLICA ARTIFICIAL FOREST GROWING IN THE SAND LAND
     灰色关联和预测分析在确定适宜的沙地樟子松人工林初植密度及密度调控中的应用
短句来源
     The Effect Analyses of Pinus massonianaSeedlings with Different Treatments at the Initial Planting Stage
     马尾松不同处理苗木造林初期效果分析
短句来源
     Effect of Initial Planting Spacing on the Growth of Betula alnoides
     西南桦造林密度与林木生长的关系
短句来源
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  相似匹配句对
     Initial D
     “头文字D” 漂移族
短句来源
     Planting
     种植花木
短句来源
     Effect of Initial Planting Spacing on the Growth of Betula alnoides
     西南桦造林密度与林木生长的关系
短句来源
     initial pH;
     初始 pH值 ;
短句来源
     The Effect Analyses of Pinus massonianaSeedlings with Different Treatments at the Initial Planting Stage
     马尾松不同处理苗木造林初期效果分析
短句来源
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  initial planting
Less than 0.2% of the firm, brown rhizomes produced shoots upon initial planting and none produced shoots upon replanting, whereas 50.9% of white rhizomes produced shoots on initial planting.
      
purpurea (48.3% in 1993 of the initial planting density of 20,000 clumps ha-1 in 1980) and G.
      
hondai trees in an old plantation (161 years old), where no silvicultural treatments (e.g., thinning) have been conducted since the initial planting.
      
The plots were hand seeded and the seed raked into the top layer of soil during initial planting.
      
The initial planting was done in March 2001, and fertilizer treatments were implemented in June 2002.
      
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DENTROL(DENsity conTROL model) is a computer model for the opti-mization of stem densities of Chinese fir plantations, which is based on theNational Experiments of Planting Density, and Tending and Thinning ofChinese Fir Plantations, and referencing to the New National ManagementTable of Chinese Fir Plantation, and formed according to distribution zone,distribution area and site indexes. The concept of the optimization of densitycontrol is the selection of a series of elements concerning stem density of astand,...

DENTROL(DENsity conTROL model) is a computer model for the opti-mization of stem densities of Chinese fir plantations, which is based on theNational Experiments of Planting Density, and Tending and Thinning ofChinese Fir Plantations, and referencing to the New National ManagementTable of Chinese Fir Plantation, and formed according to distribution zone,distribution area and site indexes. The concept of the optimization of densitycontrol is the selection of a series of elements concerning stem density of astand, including initial planting density, year of first thinning, thinning intensity, times of thinning, ages of harvesting, and planting aim, from whichthe final internal return rate (IRR) will be maximum or so. Data from 12plots in Tending and Thinning Experiment were used to test the accuracy ofthe model in predicting stem growth. The results showed that the standarddeviation was +/- 8.9%, the systemic error was 1.8%, which are enoughfor the demand of forestry production practice. According to calculations,based on the plantation of the whole country, the average net present valueper hectare of plantation managed with optimized stem density will increase(?)321. 7, bu 17.0% , and which will increase (?)892. 4, by 47.3% , if only basedon the main commercial timber base——the distribution area of Chinese firplantation.

DENTROL模型是根据全国杉木造林密度试验和杉木林抚育间伐强度试验的结果,参照新编的全国杉木人工林经营数表,分别杉木分布带、区和地位指数级,编制成的优化密度控制计算机模型。它主要以内部收益率为目标函数,辅以其它指标,实行全局优化判别。优化密度控制包括初植密度、间伐开始期、间伐强度、间伐次数、保留密度、主伐年龄和培育目标的确定,使最终的内部收益率为最大或接近最大。以12块抚育间伐试验标准地的数据,对模型的材积生长预测的精度进行检验,结果表明模型的材积预测标准差为±8.9%,系统误差为1.8%,符合生产实际的要求。根据计算,采用优化密度控制比非优化的对照区,按全国平均,每公顷净现值可提高321.7元,即提高17.0%。如仅以主要商品材基地——杉木分布区中带计算,则可提高经济效益47.3%,即每公顷可提高净现值892.4元。

Based on the Cunninghamia lanceolata zone and region,which are divided in 14 southern provinces(regions)accordiog to the Chinese fir research coordinated groups,in 1981 the experimental plantations of Cunninghamia lanceolata were established in Guangxi,Jiangxi,Fujian, Sichuan and Henan Provinces,which consisted of 5 different densities.The measurements of 10 years showed that densities influenced the main growth parameters of trees and wood quality. According to the analysis of timber yield and economic benefit,the...

Based on the Cunninghamia lanceolata zone and region,which are divided in 14 southern provinces(regions)accordiog to the Chinese fir research coordinated groups,in 1981 the experimental plantations of Cunninghamia lanceolata were established in Guangxi,Jiangxi,Fujian, Sichuan and Henan Provinces,which consisted of 5 different densities.The measurements of 10 years showed that densities influenced the main growth parameters of trees and wood quality. According to the analysis of timber yield and economic benefit,the optimum initial planting densities for various index classes are determined,i.e.5000 trees per hectare are optimum for the index class of 14-16 in the south and middle zone, and for the index classes of 12-14 in the north zone, 3333 trees for those over 18 classes in the mid zone.

以南方14省(区)杉木栽培科研协作组划分的杉木带、区为基础,于1981年分别在广西、江西、福建、四川及河南各省设置5种密度的杉木造林试验林。经过10年试验结果,研究了密度对主要测树因子和木材质量的影响,还根据出材量和经济效益分析,确定了各带主要指数级的最佳初植密度。即南带。中带14—16指数级和北带12-14指数级每公顷以栽植5000株为宜;中带18指数级以上者,每公顷以栽植3333株为宜。

Three kinds of planting density ( ①2500 tree/hm~2, ②1666 tree/hm~2, ③ 1111 tree/hm~2 ) of 5 year Encalyptus urophylla S.T.Blake were set in Leizhou peninsula in Southern Sub-Tropical. Density rule and 8 functicns are introduced after analyzing the diameter at breast height(DBH), dominant height, crown area, form factor, individual tree volume and volume relative to density. DBH change quickly the size and distribution relative to density, results in the variation of form factor, crown area, individual tree volume...

Three kinds of planting density ( ①2500 tree/hm~2, ②1666 tree/hm~2, ③ 1111 tree/hm~2 ) of 5 year Encalyptus urophylla S.T.Blake were set in Leizhou peninsula in Southern Sub-Tropical. Density rule and 8 functicns are introduced after analyzing the diameter at breast height(DBH), dominant height, crown area, form factor, individual tree volume and volume relative to density. DBH change quickly the size and distribution relative to density, results in the variation of form factor, crown area, individual tree volume and volume.Dominant height is not relative to density. According to the analysis of volume and economic benefit, the optimum initial planting density and rotation are determined.

本文通过对地处亚热带南端的雷州半岛5年生尾叶桉(Eucalyptus urophylla S.T.Blake)3种不同造林密度:①2500株/hm~2、②1666株/hm~2和③111株/hm~2的林分中,密度与胸径、优势高、冠幅、形数、单株材积和蓄积等相关关系的详细分析,得出了尾叶桉密度作用规律和8个相关模型。其中,密度对胸径的影响最敏感,不但影响胸径的大小,而且影响胸径的分布;同时这种影响还波及到形数、冠幅、单株材积和蓄积;密度对优势高的影响不显著。同时经过经济效益分析,得出了最佳初植密度和最佳采伐年龄。

 
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