信州落叶松人工林生长模型及其系统收获表的研究

系统收获表能预测现实林分在各种经营体系下的生长过程和收获量。本文根据信州落叶松人工林固定标准地观测数据，从林分和单木两个水平分析和建立了生长模型，在此基础上编制了信州落叶松人工林系统收获表，提出系统收获表的一般编制方法。本研究的特点是以现实林分为研究对象，建立全林分生长模型和林分径阶生长模型，将前者的总生长量通过后者分配给各直径阶和树高阶，以保证林分水平的预测结果和单木水平的生长是相容的。     

基于系统收获表和地理信息系统的森林预测图──空间检索和预测(英文)

基于系统收获表和地理信息系统（ＧＩＳ），该文提出能为森林资源管理提供实用有效森林空间信息的一种方法．该方法能结合系统收获表的生长预测功能和地理信息系统的空间信息处理功能，检索、表示和绘制将来的森林预测图，并且明确了森林预测图的制作过程．该研究成果有助于扩大系统收获表的作用，使系统收获表成为森林资源管理的实用工具     

永定县马尾松人工林经验收获表编制及其用材林资产评估的应用研究

搜集福建省永定县森林资源清查中按随机或抽样方式设置的样地资料,选择317块符合要求的样地的测树因子数据,采用Shumacher方程描述平均胸径和平均树高的生长过程,并用平均胸径和平均树高建立株数预估模型,结合林分收获模型及有关公式编制了马尾松(Pinus massoniana Lamb)人工林经验收获表,并探讨该表在生长收获预测和用材林资产评估中的应用,分析了评估中的影响因子。     

杉木人工林全林分模型及货币收获表的研制

利用杉木人工林现场实际造材样木以及木材价格、生产成本、税费等技术经济指标测算单木纯收益,并建立单木货币预估模型。以年龄、地位指数、林分密度为辅助变量,选择Korf理论生长方程构建杉木人工林全林分模型,结合单木货币预估模型按经营类型编制杉木人工林林分货币收获表。应用林分货币收获表,既可预估林分在各种年龄时的木材产量及与材积有关的林分因子,同时还体现了林分货币收获量,在森林资源经营、资产化管理和资产评估中有实际应用价值。     

蕉城区马尾松人工林经验收获表的编制及应用研究

选择理查德方程描述平均胸径和平均高的生长过程,采用平均胸径和平均高二个因子控制各龄阶的株数,并用逐步回归技术建立林分蓄积量预估模型,在此基础上,结合有关方程和公式编制了蕉城区马尾松人工林经验收获表,该表经检验证明适用。最后,给出了应用经验收获表进行生长收获预估的实例。     

杉木人工林标准蓄积量收获模型

本文根据江西永新县31块杉木人工林林分生长过程解析标准地资料．分析了立木株数随林分平均直径的变化规律。通过林数标准化，将合标准地林分蓄积量转换到标准林分（郁闭度1．0）水平，采用改进的8参数Chapman－Richards函数，用Marquardt迭代法建立了以地位指数和年龄为解释变量的杉木人工林多形标准蓄积量收获模型，为立地质量评价和森林资源的生长预测提供依据。     

杉木人工林标准蓄积量收获模型的研究

根据３１块形杉木人工林林分生长过程解析标准地资料，分析了立木株数随林分平均直径变化的规律。通过株数标准化，将各标准地林分蓄积量生长过程数据转换到标准林分（郁闭度１．０）水平，采用改进的８参数Ｃｈａｐｍａｎ－Ｒｉｃｈａｒｄｓ函数，用Ｍａｒｑｕａｒｄｔ迭代法建立了以地位指数和年龄为解释变量的杉木人工林标准蓄积量收获模型，为立地质量评价和森林资源的生长预测提供了依据。     

太行山区油松人工林收获表的编制

本表是在地位指数表和林分密度控制图的基础上，利用地位指数曲线和林分密度控制图中的等树高线，等直径线数学模型进行编制的。其理论上是可行的，编制方法简便、实用。由于上两表（图）都是经过严格检验，且精度较高，因此编出的收获表的精度也能满足要求。     

马尾松人工林货币收获表的研究

利用马尾松人工林伐倒木实际造材和木材价格、生产成本等技术经济指标建立单木货币纯收入模型,选择Korf理论生长方程构建全林分模型,按用材林树种经营类型编制马尾松人工林货币收获表。该表除了具备传统的林分可变密度收获表所具有的林分因子外,还体现了林分货币收获量,在森林经营管理和资产评估中有着实际应用价值。     

林分密度指数研究现状

林分密度指数是基于林分层次,对于量化林分密度与生长情况所提出的一项指标,其研究的核心是掌握林分的自然稀疏规律。在森林决策经营问题上,林分生长收获预估研究是最重要的一环,但其中林分生长收获模型的建立及预测的准确性一直是个难题,考虑众多林分生长指标后,林分密度成为了林分生长预估模型的核心问题。对于多种多样的林木种类和复杂的林分立地条件,林分密度指数的应用范围也受到限制,本文将就林分密度指数研究现状展开论述。     

Management and yield prediction of Kunugi (Quercus acutissima) grazing forests

This study deals with grazing in kunugi (Quercus acutissima) forests in the Aso district of Kyushu Island in southwest Japan. These forests are managed for production of bed-logs for shiitake mushrooms and cow-calf farming. One of their characteristics is short-term rotation such as 10–15 years for bed-logs and a year for calf production. A forest grazing experiment was begun in Minamioguni to look at forest growth, vegetation change and grazing intensity. Stem densities dropped in a few years. After sprout cutting, they also dropped gradually, then stabilized. Although grazing caused tree damage and suppressed tree growth, grazing intensity of up to 150 cow-days/ha·year did not harm forest regeneration. Herbage volume decreased as grazing was repeated and trees grew. Another investigation of kunugi grazing forests in Minamioguni and Asaji showed the correlation betweenRy (yield index in Stand density diagram) and grazing capacity could be expressed with a regression equation. The results were also used to design a yield table for kunugi grazing forests. The yield table has items ofRy and grazing capacity in addition to usual yield table items, and can indicate timber yield and grazing capacity at the same time. The table estimates that proper grazing capacity is 60–80 cow-days/ha·year in wild grass sites. In the light of these results, an optimal management plan was proposed as a diagram integrating stem density, forest yield, and forest management.     

全国杉木人工林间伐表编制的研究

根据全国各带，区，各指数级杉木林分生长过程，编制了８～２２指数级相应的间伐表共５组（即南带，北带，中带东区，中区和西区）利用５３块间伐标地材料，以ｙ＝ａ＋ｂｘ模型，求出间伐后的平均高和平均胸径的回归经验式，该表与利用杉木林分密度管理图编制的间伐表进行检验比较，误差在１．９％～２．６７％之间，间伐开始期，则视初植密度的大小，与指数级的高低而异，间伐终止期，一般为１５ａ，最大不超过１８ａ，且与初植密度     

Growth and yield models for Dahurian larch plantations

IntroductionDahurianlarch(L8risgmeliniiRupr.)isoneofthemostimportanttimberspeciesinChina.AsaresuItofovercuttingforseveraIdecades,thenaturaIDahurianIarchforestresourcesaredecliningrapidly.PIantationsofdahurianIarchhavebecomeanimportantpartofforestpreserveresourcesinDaxing'anMountains.ConsequentIystudyingthegroWthofDahurianlarchandformingtheforesttabfesareofsignrficancetofor-estproduction.ThispaperpresentsinformationongroWthandyieIdmodeIsofDahurianlarchpIantations.MethodsDataof4O5stema…     

天然林区小班森林资源数据的更新模型

以吉林省汪清林业局为例,根据１９９７年森林经理调查的８４８块固定样地数据,与全林整体模型方法相结合,建立了适合于天然林区林业局（场）无人为干预小班森林资源数据更新的林分级生长模型组。该组模型包括林分密度指数,平均高,断面积,形高,郁闭度等林分测算因子的生长或变化模型。     

马尾松人工速生丰产林林分生长模拟与最适密度管理技术研究

以固定样地观测和临时样地调查相结合的办法收集林分现实生长与经间伐或间伐设计后所保留群体的生长资料;以固定样地观测资料为依据,以林分平均胸径连年生长量及胸径度离散度的指标,确定不同地位指数林分间伐的起始年龄;采用Ｒｉｃｈａｒｄｓ函数模拟合理密度与生长水平下的林分平均树高及胸径生长;并采用间伐或间伐设计前,后林分生长标准的调查资料,以地位级指数,林林分平均胸径及胸径离散度为自变量建立起人工速生丰产林的     

安徽亳县泡桐立地质量评定

本文在分析林木直径和树高的相关性的基础上,结合平原农区地形地貌特征,以林分内最大径阶木的平均胸高直径代替优势木的平均树高作因变量,以林分平均林龄和土壤种类、土层厚度、地下水位、株距等定性因子作为自变量,分别编制出安徽省亳县泡桐人工林地位指数表和数量化地位指数表,并在此基础上将泡桐人工林划分为14个立地类型。该项研究对于探讨平原农区主要树种有关经营数表的编制方法、立地类型划分和林木生长预估等具有普遍意义。     

黄冕林场桉树人工林经营利用与经济效益分析

对广西黄冕林场3-5年生桉树人工林进行生长调查,探讨分析桉树经营利用经济效益。结果表明：桉树人工林中,不同林龄和同一林龄桉树人工林之间生长差异明显。不同的立地条件、初植林分密度对桉树人工林胸径、树高等生长影响很大。随着林分密度（标准地样木数）的增大,样木数与生长指标之间具有较强的负相关性。随着林龄的增大,这种林分密度负效应就越明显。从财务指标看,随着林龄的增大,总产值、纯利润和NPV均呈现增大的趋势,但IRR却并不如此,而是先增大后减少,在4a时,IRR达到最大值。从年份看,投资回收期为3a。结果表明桉树在广西黄冕林场这样的立地条件和气候条件下,表现适生、速生,且经济效益好,是营造短周期用材林的好树种。但为获得好的经济效益,必须注意树种、立地条件和栽培等措施的选择。     

A growth and self-thinning model for pure even-age stands: theory and applications

A self-thinning model is developed for fully stocked and under stocked pure even-aged stands. The self-thinning power law for fully stocked stands can be considered as a special case of this model. A stand growth model is developed by combining the self-thinning model with a basal-area increment model. This stand growth model can be used to estimate the average diameter and stand density at any given stand age with any initial stand conditions. The model was tested with yield table data. The model predictions were found to be agree with independent developed yield table data.     

GROWTH AND YIELD MODELS FOR DAHURIAN LARCH PLANTATIONS

Growth and yield models were developed for individual tress and stands based on336 temporary plots with 405 stem analysis trees of dahurian larch(Larix gmelinii(Rupr.)Rupr.)plantations throughout Daxing’anling mountains.Several equations were selected using nonlinearregression analysis.Results showed that the Richards equation was the best model for estimatingtree height,stand mean helght and stand dominant height from age; The Power equation was thebest model for prediction tree volume from DBH and tree height; The logarithmic stand volumeequation was good for predicting stand volume from age,mean height,basal area and other standvariables.These models can be used to construct the volume table, the site index table and other for-estry tables for dahurian larch plantations.     

A silvicultural management tool for the Oriental beech (Fagus orientalis Lipsky) forests

Stand density management tools help forest managers and landowners to more effectively allocate growing space so that specific silvicultural objectives can be met. Due to the economic importance of Oriental beech (Fagus orientalis Lipsky) forests in Turkey, a stand density management tool was developed for this species to optimize regeneration success rate and tree growth. For the development of this tool, named stand density management diagram (SDMD), we utilized forest inventory data from the Kastamonu Regional Forest Directorate in Turkey. Previously published forest management approaches and models were employed during the development of the tool. The SDMD illustrates the relation among four forest indexes: the basal area per hectare, number of trees per hectare, forest stand volume per hectare, and quadratic mean diameter of the beech stands. The stand stocking percent (SSP) can be determined based upon any two of these four measurements. The results suggest that SSP is a better predictor of tree growth than BA in Oriental beech forests. The newly developed SDMD allows for a more effective use of the growing space to achieve specific silvicultural objectives including tree regeneration, timber production, thinning planning, and wildlife protection in Oriental beech forests.