次生林

土壤颗粒度、pH值、有机质和全氮含量在灌草丛和原生林之间存在显著差异，但所有土壤理化指标在次生林和原生林之间无显著差异。

There were significant differences in soil grain structure , pH , organic matter and total nitrogen between shrub-grassland and virgin forest , but no significant differences between secondary forest and virgin forest were detected .

这充分表明了三参数的Weibull分布具有较大的灵活性，并且能够很好地拟合天然次生林直径分布。

This fully shows that the three-parameter Weibull distribution is of greater flexibility , and better able to fit the diameter distribution of natural secondary forest .

所获数据表明，地表凋落物数量（现存量干重）和质量（N和C/N）总体上表现为35年次生林最好，23年次生林次之；

The results showed that both the quantity and quality ( N and C / N ) of litter in the 35-year secondary forest were higher than those of the 23-year secondary forest and the seasonal rainforest .

结果表明：（1）橡胶林比次生林具有更低的土壤有机质和全氮含量以及更高的土壤pH值。

Our results showed that : ( 1 ) Soil organic matter and total N concentration in secondary forest were significantly higher than those in rubber plantation . In constrast , soil pH showed a different pattern .

并利用径阶株数分布直方图、Weibull分布等函数及拟合检验方法，分析不同地区白桦天然次生林直径结构的差异。

And using the diameter number distribution , Weibull distribution function and fitting inspection method , analysis of different regions of birch natural secondary forest diameter structure differences .

由此可见，太行山天然次生林在维持大气中O2和CO2平衡、调节气候、净化空气等方面起着相当重要的作用。

Thus , the natural secondary forest in Taihang Mountain plays a very import role in maintaining the equilibrium of CO2 and O2 , regulating climate , cleaning air and so on .

对辽宁东部山区次生林中的混合硬杂木，利用APMP制浆方法进行了研究。

This paper reports the study of APMP using mixed hardwood , which grows in the secondary forest in Liaoning eastern mountain area .

在植被恢复的过程中，该岛土壤pH值按退化草坡→人工林→次生林的顺序呈现出逐步降低的趋势。

During vegetation restoration in the order of degraded grassland → artificial forests → secondary forests , the pH value of soil was decreasing gradually , while the soil total nitrogen , available phosphorus and exchangeable Ca , K , Mg were increasing gradually .

比例方面，天然次生林DOC比例比农田和草地中低，人工林比它们高，差异主要在0~10cm土层；

The difference of the soil solution DOC concentration or fraction between the natural secondary forest or plantation and rangeland or cropland was greater at 0-10 cm soil depth than 10-20 cm soil layer .

ITTO对原始林、退化原始林、次生林和其他热带森林类别的界定

ITTO 's Classification and Definition on Primary Forest , Degraded Primary Forest , Secondary Forest and Other Categories of Tropical Forests

在次生林带状改造中，经过方差分析表明：选择6m、4m采伐带宽度对落叶松更新成活率效果较好；

In the course of secondary forest strip reform , the result of variance analysis shows that in the 6m-width and 4m-width harvesting strips , the surviving rate of larch is better .

次生林下栽植红松生长的最适生态条件是无灌，距大立木2m以远及林冠郁闭度0.5&0.6。

Optimal ecological conditions for the growth of planted Korean pine are sites with sparse bush cover , more than 2m far from big tree and a canopy density of 0 . 5-0 . 6 .

等级聚类分析和无偏对应分析（DCA）结果显示：次生林群落多样性较高，人工林较低。

The results of Hierarchy Clustering Analysis and Detrended Correspondence Analysis ( DCA ) showed similar trend : Secondary forest had the highest diversity , while the diversity of the plantations is relatively lower .

随着林龄的增大，次生林与原始暗针叶老龄林间的Bray-Curtis指数也有增大的趋势。

With increasing age , the value of Bray-Curtis index between secondary forest and old-growth dark brown coniferous forest had an increasing trend .

在珠海市10个陆生次生林群落中设置了112个10m×10m样方，用于珠海市次生林群落23个优势种的生态位宽度和生态位重叠的研究。

A total of one hundred and twelve 10 m × 10 m quadrats were set up in ten terrestrial secondary forest communities of Zhuhai City , Guangdong Province to study the niche breadth and niche overlap of the dominant plant species .

从森林景观恢复和森林经营的角度，建立了适用于FLR的森林景观要素分类系统，包括退化原始林、次生林、退化林地、人工林等类型。

In view of forest restoration and rehabilitation , system of forest landscape element types was set up , mainly including degraded primary forest , secondary forest , degraded forest land and plantation .

采用野外采样及室内测试分析方法，研究了风干、烘干对西双版纳3种不同热带森林（季节雨林、人工林、次生林）0&15m土壤NH4-N、NO3-N测定结果的影响。

Variation of contents NH4-N 、 NO3-N in three tropical forests ( seasonal rainforest , artificial forest , secondary forest ) soil samples ( 0 & 15cm ) during air-drying and heat-drying was investigated .

油松保护林是在60～70a前，受某种干扰后形成的相对同龄次生林。

The gene conserved stand of Pinus tabulaeformis was formed by age of 60 ~ 70 , and is secondary stand in comparatively the same age range after disruption .

结果发现，岩溶山地次生林下贮存有丰富的植物种子，在厚度为10cm的表层土壤中的种子储量变动于4930～14930粒/m2之间，高于对照成熟林的3780粒/m2。

There were abundant viable seeds stored in the soil seed banks under karst secondary forests . Seeds identified in soils at 10 cm depth ranged from 4 930 to 14 930 indi . / m ~ 2 , higher than that of 3 780 indi .

采用正交设计，对立地指数为12~14的23a生马尾松天然次生林不同肥种与配比施肥4a后的效果进行了系统研究.单个萝卜重量随着化肥用量的增加和施用腐殖酸盐而增加。

Systematic research was done on measuring the effects of fertilizer application on different single fertilizer and different proportioning fertilizer 4 years after fertilization in the 23-year-old natural secondary forest of Pinus massoniana by orthogonal design method . Single radish 's weight increased with the using of fertilizer and humate .

一个新的格局检验模型及在天然次生林生态采伐中的应用

A New Pattern Testing Model and Application on Secondary Forest Cutting

马尾松次生林研究现状和展望

The Status and Prospects in Research of Secondary Masson Pine Froest

天然次生林主要种群生态位结构的研究

Study on Niche Structure of Dominant Population in Natural Secondary Forests

环境和火对次生林演替有一定影响；

Environment and fire have some effects on secondary forest succession .

山地次生林冬季鸟类集群的初步研究

On bird flocking in secondary forest of Mountainous District in winter

次生林的经营，一直是林业研究的热点问题。

Secondary forest management is a hot issue in forestry research .

水曲柳天然次生林能量结构的研究

Study on the energy structure of Manchurian ash natural secondary forest

无想寺森林公园麻栎次生林群落学特征

Community Characteristics of Quercus acutissima Forest in Wuxiang Temple Forest Park

山地次生林鸟类集团结构及关系的研究

On the guild structure and its relationship of secondary forest bird community

次生林全面清坡造林幼林地，其群落优势种为甘肃鼢鼠。

In clear cutting forest , the dominant species was Gansu zokor .