过熟林

近熟林、成熟林和过熟林采用收益方式估价方法。

Benefit valuation method is often used to estimate submature , mature and overmature forest .

龄组结构劣变，近成过熟林比例过低；

A low-grade forest age groups that the proportion of near-mature , mature and overmature forest is comparatively lower ;

本文用收获法、相关曲线法测定并估算了该群落近熟林和成过熟林的生物量与年平均净积累量，结果分别为508.57t／hm2，12.1051t／（hm2·a）；

The biomass and mean annual net accumulation for the pre-matured and the matured or over-matured forest communities were estimated through harvesting and correlation . The results show that the biomass was 508.57t · hm-2 and 293.04t · hm-2 in the prematured and the matured or over-matured forests , respectively .

红松成过熟林伐区调查设计中资源误差的分析

Error analysis of resources in survey and design for over-aged korean forests

由成过熟林占据绝对优势演变为幼中龄林占优势的结构，很难实现可持续。

It 's difficult to realize sustainable development .

根际多酚氧化酶活性在过熟林阶段高于其它阶段。

As for the variation of the soil enzyme activity in different stages of C.

而中龄林的碳贮量最多，过熟林碳贮量最少。

The most carbon storage are middle age forests , and the least are excess mature forests .

森林资源的结构不太合理，中龄林和近熟林面积占据较大比例，中龄林和近熟林的蓄积量有所增加，成过熟林的蓄积明显减少；

The structure of forest resources was unreasonable : the proportions of immature and near-mature forests were larger ;

采伐改变了树种年龄结构，降低了过熟林的相对面积；

Cutting changed the age structure of tree species , and reduced the distribution area of over-matured forests .

研究区以成熟林和过熟林为主，生态环境保护较好。

In study area , there are mainly mature and over-mature forests and the eco-environment is in good conditions .

作者指出，对该区的中龄林应进行抚育采伐，成过熟林应强化开采，否则，每年将损失11亿元。

The author indicates that attending felling should be speedily exploited or annual loss would be 1100 million yuan Per year .

近、成过熟林在景观中所占比例减小，针叶和珍贵阔叶林比重增加，建筑用地斑块扩大明显。

Old growth forest ratio in landscape decreases , softwood forest ratio and rare broad-leaved forest ratio turn high and constructive land patch enlarge apparently .

结果表明：该地区针叶混交过熟林、冷杉成熟林林地的土壤在低吸力段，各吸力值含水量高，其持水性能有利于森林水文功能的发挥和林木的生长；

The results showed that the soils of over-mature coniferous mixed forest and mature fir forest had higher water content and retention capacity within low suction , were favorable for forest hydrological function and growth .

两期景观格局的空间特征定量分析的结果表明，在景观空间组成上，1998年景观类型增多，但成过熟林斑块比例显著减少，作为顶级群落的天然针叶类斑块的比例进一步减少；

On respect of landscape composition , patch types was increased in 1998 , but the area ratio of mature and over-mature patch was decreasing strikingly , and conifer patch ( belonging to local climatic community ) having decreased further .

按各龄组面积排序为：中龄林〉幼龄林〉近熟林〉成熟林〉过熟林，中、幼龄林占据了研究区总面积的86.2%，成熟林只有5.35%。

According to the age group of area of order : middle age of stand young forest near-mature forest mature forest overmature forest in the research area , sapling occupies 86.2 % of the total area , grove and only 5.35 % .

不同经营管理模拟情景中，林业用地的成过熟林所分布的面积都占很大比例，森林景观变化是一个长期渐变的过程，区域景观结构在短期内不会有很大的变动。

Mature and Over-mature forest holds very large proportion in different management plan Scenarios , this indicates that forest landscape dynamic is a long-term process , landscape structure of the study area will not have a big change in the short term . 5 .

天然红松成过熟林伐区设计与实际商品出材量存在着误差.一元立木材积表超过20.635、红松误差为15.68%。实际超采伐量的设计资源消耗量大25%－50%。

There is error between cutting area design and practical wood product in the crude pine overstand wood . Wood cubic table over percent 20 . 63 . pine error is percent 15 . 68 . Practical cutting out & put is percent 25 to Percent 50 than resource design .