林分

最后对研究林分制定了示范设计。

The standing forest studying finally has been worked out setting an example design .

密度多大将会影响林分生长，须分坡向、坡位进行量化。

Density will affect the growth of standing forest and shall be quantized according to slope and slope position .

基于RS、GIS的林分龄组分析

Study on Stand Age Class Based on RS & GIS

Logistic分布预测林分直径结构的研究

Quantifying and Predicting Stand Diameter Structure with the Logistic Distribution

由定义正常林分可视为k值最大的林分，所以提高k值可求正常林分断面积生长曲线，编制出正常收获表。

Thus basal area growth curve of normal stand could be easily obtained by increasing K and normal yield table was constructed .

参数q与林分平方平均直径紧密相关，为分布的位置参数，指代林分分布数据的平均大小；参数r决定分布曲线的拐点，为分布的形状参数。

The location parameter q was highly correlated with quadratic mean DBH and the shape parameter r indicated the inflection point of the distribution .

Richards函数在桉树无性系林分生长预测上的应用研究

Application of Richards growth function in prediction of the growth of Eucalyptus clone stands

2）2种林分直径分布的偏度系数（Sk）差别较大；

2 ) The skewness ( Sk ) of diameter distribution had great distinction .

林分直径分布，幼龄林呈倒“J”型，壮龄林近似于正态分布；

The stand diameter distribution of juvenile stand appears an inversed " J " form , and that of the half mature forest approximately a normal distribution .

在建模的过程中可以发现，ANN的精确度比传统的模型高，所做出的资产评估也符合实际情况，这对今后的林分密度控制图的编制有重要的指导意义。

As a result , the accuracy of ANN model is higher than traditional one , which has an important significance for the future formulation of stand density control chart .

在植被层中该林分营养元素的年吸收量、年存留量、年归还量分别为92.29、61.93、30.36kg（hm2·a）。

The annual uptake , store and return of the nutrient elements were 92.29 , 30.36 and 61.98 kg / hm 2 respectively .

叶面积指数（LAI）是群体结构的重要参数，也是衡量林分质量的重要指标。

Leaf area index ( LAI ) is an important parameter in plant population structure research , and of significance in the estimation of stand quality .

通过3年的实践共完30万hm2的抚育任务的工程建设目标，达到了调整林分密度，优化林分结构，改善林木生长环境，加速森林资源培育的目的。

The tending has aimed to adjust stand density , optimal stand structure , better forest growth environment and speed up the cultivation of forest resources .

可见，与未围栏相比，围栏对提高樟子松林N养分有效性、林分生产力和稳定性以及保护环境都是有利的。

All of these mentioned above demonstrates that it is advantageous to improve soil N availability , stand production and protect environment , when the P. sylvestris var. mongolica stands on sandy soil are intensively managed ( from unfenced to fenced ) .

利用双向指示种分析法（TWINSPAN）和除趋势对应分析（DCA）对昆嵛山不同林分类型下的灌木层和草本层进行了数量生态学分析。

The TWINSPAN classification and DCA ordination were employed for the quantitative analysis of the shrub layer and herbage layer under different stands .

用台湾相思更新木麻黄防护林使土壤pH值呈上升趋势，这与台湾相思林分土壤中水解性总酸度、交换性总酸度和交换性铝含量降低有关；

PH value showed the trend of declination in soil of Acacia confusa plantation compared with the first and second generation of Casuarina protection forest , and it was related to the declination of hydrolytic acidity , exchangeable alkalini , and exchangeable aluminum ;

高密度的LiDAR点云数据与高空间分辨率的高光谱数据不仅能够提供林分尺度的森林参数，还能提供单木尺度的森林参数。

High density LiDAR point cloud data , as well as the high spatial resolution hyper-spectrum image , can provide not only forest parameters in stand scale , but also in individual tree scale .

该文研究了3种林分类型樗蚕Philosamiacynthia自然种群动态。结果表明：樗蚕世代内种群数量呈不断减少趋势；

The result of the survey in three types of stands showed that the population density of Philosamia cynthia decreased gradually in the generation .

通过设置4种不同的造林密度试验来研究密度对桉树无性系林分生长的影响，并以Richards生长函数为模型拟合了不同造林密度条件下桉树无性系林分生长模拟预测模型。

This paper deals with the effects of 4 different planting densities on the growth of Eucalyptus clone stands and a growth prediction model was established based on Richards function .

不同林分土壤和枯枝落叶层DOM紫外-可见吸收值均随波长的增加而减小，枯枝落叶层的在200nm附近出现吸收峰，而土壤的则不明显。

UV / VIS absorption spectra of DOM from forest floor showed a peak at around 200 nm , but it is not true for DOM from forest soil .

随着海拔的升高，土壤pH值降低，有机质和速效P、K含量增大，土壤肥力空间分异程度减小，这可能与随着海拔升高人为干扰强度降低及林分类型趋向单一有关。

The soil pH value decreased with the altitude , whereas organic matter and available P 、 K increased ; The soil fertility spatial variation decreased as the altitude went up , which may have something to do with mankind disturbance strength lowering and forest type inclining to sameness .

另外，由于营造单纯林，林分密度高，水分亏缺，以及感染枯梢病等，使生育期更加缩短，章古台樟子松更新的林龄为40～45a。

Additional , the high density of the pure stand and the disease also shorten the maturity period .

在给定初始条件后，模拟了自然演替和实行采伐控制的林分断面积、径阶、年龄和采伐收益200a的变化。

Under the given initial conditions , the variation of stand section area , diameter size , age , and effect from cutting during 200 years were simulated under natural succession and dynamic cutting respectively .

利用桂南地区收集的人工实生林分标准地材料和优势解析木杉木93株，马尾松162株，建立优势高生长Richards模型。

Based on data obtained from 93 Chinese fir and 162 Masson 's pine dominant analysis trees which collected from the two tree species stands in the south region of Guangxi , the high growth models which adapting Richards function as a basic model were established .

对湘南低山丘岗区林分密度为9001125和1500株·hm-2的6年生巨尾桉Eucalyptusgrandis×urophglla丰产示范林进行了生物量及生产力的测定分析。

The biomass and productivity of 6 year old Eucalyptus grandis × urophglla high yield demonstration forest with densities of 900 , 1 125 , and 1 500 trees · hm - 2 were investigated in the low hilly area of Southern part of Hunan .

并以此提出不同间伐强度林分主伐期：对照24a、弱度和中度30a、强度30～35a。

The final cutting time for the stands with the different intermediate cutting intensities : 24 years for the control , 30 years for the weak or moderate intermediate cutting and 30 ~ 35 years for the strong intermediate cutting .

在郁闭度小于0.5林分中，平均中误差为0.502m，集中分布在0~0.7m范围内，频率为82.8%，中误差小于1m的频率为91.4%。

In the forest stand whose crown closure is under 0.5 , the average value of mean square error is 0.502m , distributed between 0 to 0.7m and the frequency is 82.8 % and the frequency whose mean square error is under 1m is 91.4 % .

依据6～7a的调查结果，分析了初植密度对林分个体生长、群体发育、形质和材性等因子的影响，和不同密度下由于林分发育进程的不同所产生的生长因子的变化。

According to 6 ~ 7 years ' field survey results the effects of initial density on the stand factors of individual tree growth , population development , tree form and wood property , and the changes of growth factors due to the difference of stand development process were analyzed .

现实异龄林分最佳直径分布模型的探讨

Study on Model of Optimum Diameter Distribution in Actual Uneven-aged Forests

林分密度影响木麻黄他感物质的分泌。

The density of Casuarina stand affected the producing of self-allelopathy .