Báo cáo lâm nghiệp: "A comparison of fitting techniques for ponderosa pine height-age models in British Columbia" potx

... ×+=φωε+×+609Ann. For. Sci. 61 (2004) 609–615© INRA, EDP Sciences, 2004DOI: 10.1051/forest:2004064Original articleA comparison of fitting techniques for ponderosa pine height-age models in British ... asthat for model (5). Therefore, I recommend the use of model (4) for estimating the height of ponderosa pine in British Columbia.The models cannot be algebraically inverted to predict siteindex ... index can be obtained fromthe models using iterative techniques [35].It is critically important to have good growth and yield infor-mation for sustainable forest management of ponderosa pine since...

Báo cáo lâm nghiệp: "A comparison of two modelling studies of environmental effects on forest carbon stocks across Europe" ppsx

... NEP of Figure 5, in the temperate zone an increase in NPPis offset by a larger increase in Rs and in the Mediterranean zonea fairly large increase in NPP is heavily offset by the increase in ... exchange can be approached in a number of ways. Penman et al. [14] have described methods for preparing annual inventories of changes in stocks of carbon in forests in the context of the UN Framework ... i.e. fine roots,is decreased in size. These results emphasize the dangers of using simple linear carbon cycling in models in which any bio-mass increase leads to an equivalent increase in all...

Báo cáo lâm nghiệp: "A stochastic height-diameter model for maritime pine ecoregions in Galicia (northwestern Spain)" doc

... longleaf pine stands, respecti-vely. In fact, the evolution of dominant diameter in control(unthinned) and thinned plots was checked, observing a slightincrement in this variable in thinned plots. ... normally defined for this species: coast and interior. The effect of thinningwas examined; however, no benefits were obtained by introducing an additional thinning response variable in the prediction ... model with a dif-ferent set of parameters for each ecoregion is needed.3.3. Effect of thinning in height-diameter relationship In the study of the effect of thinning in h-d relationship, anew...

Báo cáo lâm nghiệp: "Eﬀects of microsite variation on growth and adaptive traits in a beech provenance trial." pps

... dates, again dispersed over the whole season, using a 5-stage scale (1 – green leaves, 2 – beginning of autumn colouring of individual leaves, 3 – beginning of autumn leaf colouring on a ... their values for the positions of individual trees were estimated by ordinary point kriging. The evaluation of phenotypic variation (height, diameter, Julian days of spring flushing and autumn ... using a common two-way analysis of variance showed a significant provenance × block interaction effect indicating the heterogeneity of blocks. Analysis of covariance using single-tree kriging...

Báo cáo lâm nghiệp: "A survey of forest pollution with heavy metals in the Natural Forest Region (NFR) Moravskoslezské Beskydy with particular attention to Jablunkov Pass" docx

... pollutants originating esp. from lignite mining, processing and burning and from oil reﬁneries. In Middle Ages a centre of ore mining and processing.11 Český les (Bohemian Forest)14 Novohradské ... 4).Cadmium In the case of cadmium, evident higher pollution is detected in the area of the Jablunkov Pass in comparison with the remaining area of NFR. e spatial distinctness of distribution of ... needles68 J. FOR. SCI., 54, 2008 (2): 64–72ZincThe contents of zinc are higher in the area of Jablunkov Pass than in the remaining area of NFR (Fig. 3). Its higher contents are evident in the upper-most...

Báo cáo lâm nghiệp: "A two-step mortality model for even-aged stands of Pinus radiata D. Don in Galicia (Northwestern Spain)" doc

... thesystem providing information for decision-making [13, 29]. According to García [14], the basic elements of these types of models are: a description of the forest state at a given point in time; ... totake into account the effect of site index in modelling natural mortalitye.g. [2, 31], but all of them can be included in the general form that has been employed in all the solutions of equations ... relative rate of change in the number of stems (∆N/N·∆t) and site index isinversely proportional (f(S) = S–1). In the other equations in which site index is included, an increase in its value...

Báo cáo lâm nghiệp: " A collection of functions to determine annual tree carbon increment via stem-analysis" pot

... and forest habitat type, For. Sci. 30 (1984) 943–965.[23] Mörling T., Evaluation of annual ring width and ring density deve-lopment following fertilisation and thinning of Scots pine, Ann. For. ... J.D., Dominant height growth models and site index cur-ves for site-prepared Slash pine plantations in the lower coastalplain of Georgia and North Florida, M.S. thesis, University of Georgia, ... Millennio, Proceedings of the thirdmeeting of the Italian Society of Forest Management and Ecology(SISEF), 2003.[22] Monserud R.A., Height growth and site index curves for inlandDouglas fir...

Báo cáo khoa học: "A Comparison of Chinese Parsers for Stanford Dependencies" ppt

... Proceedings of the fourth SIGHAN bakeoff.Fei Wu and Daniel S. Weld. 2010. Open information extractionusing Wikipedia. In Proceedings of the 48th Annual Meet-ing of the Association for Computational ... Association for Computational Linguistics.Li Zhuang, Feng Jing, and Xiao-Yan Zhu. 2006. Movie re-view mining and summarization. In Proceedings of the 15thACM international conference on Information ... Spitkovsky‡vals@stanford.eduTing Liu†tliu@ir.hit.edu.cn†School of Computer Science and TechnologyHarbin Institute of TechnologyHarbin, China, 150001‡Computer Science DepartmentStanford UniversityStanford,...

báo cáo hóa học:" A comparison of classification methods for predicting Chronic Fatigue Syndrome based on genetic data" potx

... algorithms includ-ing naive Bayes, SVM, and C4.5 decision tree in the pres-ence and absence of feature selection techniques toaddress the problem of modeling in CFS. Accounting for models is ... or "control") of data instances in thetesting set, given only the assigned features (that is, theSNP information of the subjects). Given a training set of instance-label pairs, the ... functions,the linear kernel performed better than the other threekernels in terms of AUC. In addition, with the hybridapproach, the desired numbers of the top-ranked SNPs for the SVM models of linear,...

Báo cáo lâm nghiệp: "Current possibilities of using Norway spruce (Picea abies [L.] Karst.) in forest regeneration in the air-polluted region of the northeastern Krušné hory Mts" doc

... stocking of birch stands and that the number of injured plants decreases with the increasing stand density (K 2007).e smoothing of total heights and increments of underplanting in the ... agreement of increments either in the case of identical total height with all plants included in the comparison or in the case of comparing only plants without the injured terminal shoot. ... spruceReconstruction of stands Underplanting birchInspection Bohemian - Moravian uplandLineární (Underplanting of present stands spruce)Lineární (Reconstruction of stands Underplanting birch)Lineární (Inspection...

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