age class

The age class structure is one of the most important forest structures .

龄级结构是森林结构中最重要的结构之一。

On the Current Status and Strategy of Teaching in Multi - age Class

幼儿混合班教学现状与对策研究

Study on Stand Age Class Based on RS & GIS

基于RS、GIS的林分龄组分析

The mean weight per tiller decreases with the age class increased .

平均单蘖生产力随着龄级增加而下降.生殖蘖平均单蘖重具有相对稳定性。

Application of Age Class Method in Forest Management Work for Collectively Owned For-est Area

龄级法在集体林区森林经理中的应用

Investigation on the fruit cone age class distribution in the Chinese fir seed orchards

杉木种子园无性系球果年龄段分布调查

The 1st age class rhizome emerges at mid of growing season .

1龄根茎是在生长季中期开始形成的。

Majority of the entrepreneurs ( 80 % ) was between the age class 30 and 50 years .

80%手工业者的年龄在30～50岁。

And the mortality of yong trees is 48.7 % with an increase of age class .

幼树则每增加一个龄级死亡48.7%。

The 2nd age class and 3rd age class tillers were minority in the population .

2龄、3龄的分蘖株数量很少。

Maximizing the Response of Selection with Control of Inbreeding and Different Number of Age Class between Sire and Dam

公母畜间有不同的年龄组数目条件下控制近交最大化选择反应

The gradual optimal mathematical programming series model is applied to rational management of forest kind , tree species and age class in forest farm .

用逐级优化的数学规划序列模型解决林场合理经营中林种、树种与龄级三级结构的优化问题。

Most of the entrepreneurs ( 55 % ) are in the age class 40-50 years and only ( 18.33 % ) are > 50 years .

大部分的企业（55%）已有40-50年的历史，仅有18.33%的企业历史超过50年。

The storage of nutrients in rhizomes was determined by the productivity of tillers in the same age class .

各龄根茎的养分贮量决定于地上部分相关龄级蘖的物质生产；

The genetic diversity Nei index of the age class 10 is the lowest , while the age class ' is the highest .

红松各龄级内平均基因多样性Nei指数中，第10龄级最低（0.0450），第1龄级最高（0.4147）。

Two indexes of RAPD and ISSR showed genetic differentiation in temporal dimension is lower than in space and genetic variation existed within age class .

RAPD和ISSR的两种指数都表明，红松在时间尺度上的遗传分化比空间尺度的低，红松的遗传变异主要存在于龄级内。

30 years later , however , its distribution type diverted from normal distribution , and showed that the number of individuals of each age class decreased linearly .

年龄结构，在30年之前，各龄级的株数基本符合正态分布规律，而30年之后却偏离了这个规律，表现为各龄级的株数成直线减少；

The resin increasing effect on 50 age class A. fargesii treated by chemical stimulants was markedly higher than that on other age class trees .

用化学刺激剂刺激50龄级的巴山冷杉后增产效率最大。

Death density function curve displayed the character of descent in the earliness and stabilization in the late stage with the concave point in the third age class .

死亡密度函数曲线呈现前期下降，后期平缓稳定的特点，凹点出现于第3龄级；

Under same age class ( black locust is 19 years , Chinese pine stand is 21 years ), black locust stand water use is much higher than Chinese pine stand .

若按相近龄级比较（刺槐19年生，油松21年生），刺槐林地耗水能力大于油松林。

The SOD activity of D.involucrata leaves as affected by both biological and non-biological factors , and varied with age class , leaf position and leaf layer .

即珙桐叶SOD活性受生物和非生物因子共同影响，且不同年龄级、叶位、层次均存在差异。

The model allows for a population with multiple sex-age classes , different number of age class between sires and dams , and varied genetic contribution of the age class .

该模型允许群体有多个性别年龄组、公母畜间有不同的年龄组数、各年龄组有不同的遗传贡献。

Meat consumption crowd age class analysis shows that , 30 to 40 years old for meat leading consumer groups , proportion of 33 % , the second 40-50 years old consumption group 27 % .

肉制品消费人群的年龄阶层分析表明，30-40岁为肉制品的主导消费群体，比例达33%，其次40-50岁的消费群体占27%。

The results showed that the capabilities of ramet growth and production were the lowest in the 1st age class , and heightened in the 2nd and 3rd age classes .

研究结果表明，分株的生长与生产力以1龄级最低，2、3龄级依次增高。

The capacity for contribution of the modules of every age class of population was 2nd > 1st > 3rd > 4th in terms of dry matter production in the milk stage .

乳熟期各龄级物质生产对种群的贡献力为2龄级>1龄级>3龄级>4龄级。

The age class structure of Acanthopanax senticosus population was stable in the Quercus mongolica forest , but they were unstable in the theropencedrymion and secondary forest .

对不同生境下刺五加种群的年龄级结构、高度级结构和径级结构进行了研究。

Based on Leslie matrix , the change of the number of individual trees was different in the different age class under the undisturbed condition and the population dynamic changed from declination type to growth type .

利用Leslie矩阵定量模拟种群动态，发现在受外界干扰很小条件下，该种群具有波动特点，各龄级的个体数变化趋势不同，种群由衰退型向增长型过渡。

This paper reports the use of state space analysis and the optimal controlling theory to set up an optimal controlling model for adjusting age class in forest management , and gives examples in using mathematical programming to solve problems .

本文应用状态空间分析法和最优控制理论，建立了林业生产中调整树种龄级的最佳控制模型，并给出了运用数学规划求解的实例。

The potential clone population consist of rhizome buds of 0 age class and tillering node buds of 1 age class , of which 0 age class constitute the majority , 84.8 % .

无性系潜在种群是由0龄级的根茎芽和1龄级分蘖株芽所组成，其中以0龄级芽占绝对优势，达84.8%。

The rhizomes of the 1st age class of two populations had not been formed by then . The cumulate length and biomass of their rhizomes were mainly the 2nd age class .

当时2种群的1龄根茎尚未形成，根茎累积长度与生物量均以2龄为主。