Báo cáo lâm nghiệp: "Evaluation of three methods for estimating the Weibull distribution parameters of Chinese pine (Pinus tabulaeformis)" pps

... leiycai@yahoo.com566 J. FOR. SCI., 54, 2008 (12): 566–571JOURNAL OF FOREST SCIENCE, 54, 2008 (12): 566–571Evaluation of three methods for estimating the Weibull distribution parameters of Chinese pine (Pinus ... on the basis of the mean square error (MSE) and sample size. For these sample plots, the moment method was superior for estimating the parameters of Weibull distribution for tree diameter distribution. Keywords: ... introducing the LSM for ﬁtting the Weibull distribution and compar-ing their performances with the MLE and MOM. The objective of this research is to assess and compare the accuracy of the above three...

Báo cáo lâm nghiệp: "Evaluation of the growth and health status of selected clone mixtures in comparison with ordinary planting stock" docx

... started in the eighties, at the time of the culmination of air-pollution disaster. In that period, within the programme of the gene conservation of indigenous forest tree species in the Krkonoše ... generation. e selection of individuals for further growing was performed on the basis of the complex evaluation of parent trees (the health status was the main crite-rion, and both the individuals ... during controlled desiccation. On the other hand, the worst-growing clone 548 had the least favourable values of these parameters. – The results of measurements of chlorophyll ﬂuorescence and...

Báo cáo lâm nghiệp: "Evaluation of squared timber and log products in the Hyrcanian Forests of Iran" doc

... light on the pro-cesses and trends of squared timber and log pro-duction and the relations between them in the Hyr-canian Forests of Iran during the last 20 years.MATERIALS AND METHODS Areas ... METHODS Areas under StudyLocated in the northern part of Iran, the study areas are known as the Northern Forests or Hyr-canian Forests and are distributed across three provinces: Golestan, Mazandaran, ... all documents of trees cut dur-ing the last 20 years in the three provinces under study have been examined, summarized, and cat-Table 1. Canopies of trees in the Northern Forests of IranSituationClose...

Báo cáo lâm nghiệp: "Evaluation of changes in the landscape management and its influence on animal migration in the vicinity of the D1 motorway in Central Bohemia" ppsx

... was 44.24% of the size of the area of interest. Commercial zone had only begun to appear there in 1988, when they ac-counted for 0.16% of the area. At the same time, the area of forest vegetation ... di-rect occupation of biotopes. Gradual increase in acreage of forest vegetation in the surroundings of the D1 motorway was found. Forests accounted for 14.72% of the area of interest in 1949, ... takes in 200 m on each side from the centre of the motorway and which stipulates the extent of the polygon in the area of interest. In the polygon thus marked out, the individual biotopes were...

Báo cáo lâm nghiệp: "Evaluation of physiological and health state of Norway spruce plants with diﬀerent growth rate at juvenile stage after outplanting at" pdf

... years of age. e deterioration of the condition of some young forest outplantings currently arouses a question whether sorting in a forest nursery did not cause the undesirable narrowing of the ... temperatures the highest damage to the assimilatory apparatus (the highest drop in the values of Fv/Fm ratio) was found out in spruces of the “large” variant, followed by spruces of the “medium” ... nursery. The results of evaluation of physiological parameters and health status confirm a hypothesis that plants with the initial slow growth are a stable component of the population spectrum of...

Báo cáo lâm nghiệp: "Evaluation of twenty-years-old pedunculate and sessile oak provenance tria" doc

... found to be the slow-est growing. Mode 2 (crown in the upper third of the stem) entirely prevails for the type of branching. Only in the case of provenance 30 the majority of the stems were ... results of the stem shape evaluation document that ﬁ ve provenances of sessile oak and four prov-enances of pedunculate oak had the highest propor-tion of straight stems. For the majority of the ... into account the limited reliability of our conclusions and the importance of the choice of monitored traits. Indicated circumstances reﬂ ect that the results from the evaluation of 20 years...

Báo cáo lâm nghiệp: "Evaluation of a semi-empirical model for predicting ﬁne root biomass in compositionally complex woodland vegetation" ppsx

... frequency distribution of bootstrap means of the measured and predicteddata were rather similar for the FRB values calculated on the basis of tree height (Fig. 2). For the mesic woodland site the ... dis-tribution of rFRB. The results showed that for the xeric wood-land site, using tree height to deﬁne the spread and distribution of roots explained a much larger percentage of the variation in the ... thereof [3]. However, the diﬃcult nature of these methods means that studies on rootshave markedly lagged those of aboveground systems [23]. Oneoption for overcoming the relative scarcity of...

Báo cáo lâm nghiệp: "Evaluation through a simulation model of nutrient exports in fast-growing southern European pine stands in relation to thinning intensity and harvesting operations" doc

... means that for whole-tree harvesting there would be critical losses for P, Kand Ca, in the case of radiate pine, and for K in the case of maritime pine. Even in the traditional harvest of no debarkedlogs, ... indicates the critical role of P in the nu-trient dynamics of pine stands [45]. The high amounts of soilnitrogen content and nitrogen ﬁxation in the area explain the Nutrient exports of pine plantations ... the parameters which mainly inﬂuence the pool of nutri-ents exported [3] so our simulations concentrate in achievingan accurate estimation of these parameters. In fact, the selec-tion of the...

Báo cáo lâm nghiệp: "Evaluation of competition and light estimation indices for predicting diameter growth in mature boreal mixed forests" pdf

... reduces the growth of other (subject) trees. In the absence of signiﬁcant collinearity with the indices for otherspecies, this is indicated by the size of the regression coeﬃ-cient for the species’ ... in their compet-itive eﬀect on the subject tree. The analysis also estimates the neigh-bourhood area as a fraction of the maximum neighbourhood radius(8 m). The best performing formulation of ... SORTIE-BC forest dynamics model [13]. The crowding eﬀect of a neighbouring tree on the diameter growth of a subject tree of a given species is assumed to vary as a powerfunction of the size of the...

Báo cáo lâm nghiệp: "Evaluation of new silvicultural alternatives for Scots pine stands in northern Spain" pot

... with the retention of a portion of the stand in the finalcutting, and the extension of rotation to fulfill these non-timber producing objectives in the other case. The results for one stand of ... butalso others involving the preservation of biodiversity and the landscape, etc., are the lengthening of the rotation, retention of part of the trees in final cutting and, to a lesser extent, the ... siteclass 17, how the established order varies in terms of the prof-itability of the various alternatives. Therefore, the traditionalalternative is the second most preferable for an environmentwith...

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