pure forest

Pure forest is 15724 yuan ;

纯林：15274元/hm2；

Study of Biomass Growth Model of Uniform Pure Forest

同龄纯林立木增长模型的研究

The Study On The New Model Of Even-Aged Pure Forest Density Effect

同龄纯林密度效应新模型的研究

Stability of Age - area Structured Evenaged Pure Forest Systems

一类同龄纯林系统的稳定性

Study on Regeneration and Transformation of the Masson Pine Pure Forest in Eastern Anhui

皖东马尾松纯林更新改造技术研究

On Index Coefficient of Age-area Distribution Structure for Evenaged Pure Forest

纯林同龄的林龄面积分布结构的指标参数

There are significant differences in total biomass between the Chinese fir pure forest and the mixed forest .

杉木-闽粤栲混交林及杉木纯林的总生物量存在明显差异。

The Influence of Stand Factors on Aero-anion Concentration in Masson 's Pine Pure Forest

马尾松纯林林分因子对空气负离子浓度影响的研究

But long-term forestry practices indicate that pure forest of Pinus massoniana has many shortcomings .

然而长期的林业生产实践表明，马尾松纯林存在许多蔽端，在我国南方马尾松混交林的营造面积不断增加。

Generally speaking , the pure forest in the timber volume and growing stock were higher than mixed .

整体来看，杉木纯林的出材量和蓄积量均高于混交林。

The agroforestry systems and the pure forest systems are significantly better than pure agricultural land systems in terms of overall efficiency .

各农林复合系统和纯林地的综合效益明显高于纯农地系统。

A Dynamics Equation of Age-Area Structure for Evenaged Pure Forest

同龄纯林的林龄分布结构变化方程

The ratio of energy accumulation was higher , and the rate of energy flow was lower in mixed forest than in pure forest .

表明杉观混交林是一种能量生产力较高和维持地力能力较强的杉阔混交类型.同时，混交林的能量累积比大于纯林，能量流动速率则低于纯林；

Stand natural renewal capacity and stability of community succession appeared normal , especially there being adverse trend in pure forest .

林分天然更新能力及群落演替稳定性均一般，特别是纯林已经出现不良趋势。

Pinus elliottii and pure forest of Pinus massoniana had bad water conservation effect and poor soil fertility .

而湿地松和马尾松纯林保水效果差，土壤肥力低。

Diameter structure is the single-peak gaussian distributions , typical of pure forest distribution of the diameter of the structure .

直径结构呈单峰正态分布，符合典型的同龄纯林的直径结构分布特点。

Productivity of Cupressus funebris pure forest is almost as same as mixed forest .

柏木纯林的生产力和混交林差距也不大。

With the advantage of the strong resistance , high productivity and outstanding ecological function , the mixed forest is more stable than pure forest .

混交林比纯林稳定、抗性强、生产力高、生态功能显著。

The same kind of species almost appeared clustered distribution in pure forest , of which the species configuration had obvious unreasonable phenomenon .

纯林中同类树种大都成聚集分布，树种配置极其不合理的现象明显。

After 1949 the C. lanceolata culture system taking its pure forest culture system as the main part has formed . the mixed culture system ofC .

1949年后形成了以纯林栽培制为主的杉木栽培制度，杉木混交栽培制初步产生，传统的杉农套种制也有所发展。

The results shows that : 1 . There are more mixed forest of Pistacia Chinensis Bunge than pure forest .

研究结论如下：1.天然黄连木群落多以混交林为主，纯林较少。

The acid leaching and substance migrating in soil of the mixed forest were slighter than those of the pure forest ;

结果表明：针阔混交林林地土壤酸性淋溶过程及物质迁移过程比青林地土壤弱；

The component of entomogenous fungi community and the niche of dominant species in pure forest of Masson 's pine

马尾松纯林虫生真菌群落组成及优势种生态位研究

And each hierarchy of mixed forest is even degree all high than the pure forest is wanted in the community that someone worker disturbed .

而在有人工干扰的群落中，混交林各层次均匀度均要比纯林要高。

Soil productivity ; Investigation of the soil factors showed that the aeration and water perviousness of mixed forest were better than that of pure forest .

林地土壤因子调查的结果是混交林内土壤的通气性、透水性及总孔隙度均好于纯林。

The mixed forest grew fine , and increased the fruit yield as compared with the pure forest , and so improved the economic benefits of stand .

混交林分生长良好，林木产果量比纯林有所增加，提高林分的经济效益。

It is an important greening tree in urban and rural areas in Northwest and often makes up the large stretch of pure forest in alpine area .

是西北各省用材林，水源涵养林，护牧林和城乡绿化观赏的优良树种，常组成高山地区大片的纯林；

The Weibull Distribution has been widely applied in diameter distribution of pure forest , but very few studies have been reported in mui layer forest with different ages .

威布尔（Weibull）分布在同龄纯林的直径分布中已得到广泛的应用，但是在复层混交异龄林中应用的研究报道甚少。

Contents of Trace-elements and Polarizabilities of the Soil of Manmade Pure Forest Soil Semihumid Loessial Hilly Area , Northern Shaanxi

陕北半湿润黄土丘陵区人工纯林土壤中微量元素含量及其极化现状

The result showed that the Welbull Distribution was not only suited to diameter distribution of the even-aged pure forest , but also to the multi .

经研究证明，威布尔分布不但适用于同龄纯林直径分布，而且亦适用于复层异龄林直径分布。