Báo cáo lâm nghiệp: "Modeling the impact of thinning on height development of dominant and codominant loblolly pine trees" pot
Báo cáo lâm nghiệp: "Modeling the impact of thinning on height development of dominant and codominant loblolly pine trees" pot
... growth of dominant and codominant loblolly pine trees, the mean value of total height of dominant and codominant trees was calculated for each unthinned and once thinned stand at each location (site) ... right hand side of Equation (8) for agiven set of variables. The integral of Equation (8) can also becomputed online [16].4. CONCLUSIONSThis study shows that height growth of dominant and codominant ... is the stand age, Atis the stand age at the time of thinning (A > At), and r is the rate parameter corresponding to thinning response. In orderto account for the thinning response in the...
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Báo cáo lâm nghiệp: "About the benefits of poststratification in forest inventories" potx
... compares the square root of the means of the estimates s2y st.post.uncond for the conditional vari-ance (1), the means of s2y st.post.cond as estimates for the unconditional variance ... by far, and the conditional and uncondi-tional variance estimators, on an average, exhibit no remarkable differences. us, the component of variability associated to the variability of the sample ... sizes of the systematic samples and related c/k values, standard deviations (black diamonds), and coefficients of variation (grey diamonds)18Fig. 4. Sample sizes of the systematic samples and...
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Báo cáo lâm nghiệp: "Estimating the sustainable harvesting and the stable diameter distribution of European beech with projection matrix models" pdf
... defines the stable diameter distribution and, consequently, the long-term dynamics of the non harvested populations. On the other hand, and assuming that condition (C1) holds, conditions (C2) and ... distribution. Condition (C3), to-gether with conditions (C1) and (C2), define the harvesting strategyfor the model, and are formulated as follows:(C1) A necessary condition to carry out the harvesting ... the threshold of 99 stems/ha in the (8,12) diameter class, the recruitment was in-sufficient to maintain on the long run the structural stability of the stand, and it is necessary to reverse the...
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Báo cáo lâm nghiệp: "Predicting the vertical location of branches along Atlas cedar stem (Cedrus atlantica Manetti) in relation to annual shoot length" pdf
... influences more the occurrence and the length of the zones than the axes composition of eachzone. The length of every zone was modeled as a function of the length of the whole annual shoot. These parameters ... of the stem measured below the branch at the height hi+1, riis the radius of the stem measured above the branchat the height hi and α is the branch insertion angle.between the height of ... hr is the calculated height of insert point of the branch to the pith, hm is the measured height of insert point of the branch to the trunk, ri+1is the radius of the stem measured below the branch...
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Báo cáo lâm nghiệp: "Optimising the management of even-aged Pinus sylvestris L. stands in Galicia, north-western Spain" ppt
... basal area. Therefore, the reliabil-ity of the projections done after thinning may be questioned. On the other hand, some studies on Scots pine suggest that the post -thinning growth of trees can ... between stand age and the ratio of the meandiameter between post- and pre -thinning stand.However, the effect of timber prices on the timing and inten-sity of thinnings is rather small. The optimal ... arestand age, dominant height, number of trees per hectare and standbasal area. Stand age and dominant height define the site index whichis dominant height at 40 years. In this study the age of the...
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Báo cáo lâm nghiệp: " Optimising the management of uneven-aged Pinus sylvestris L. and Pinus nigra Arn. mixed stands in Catalonia, north-east Spain" pps
... combination of DVs was fed into the simulator, which simulated cuttings and the development of the stand, and from these results the value of the objective function wascalculated. The objective ... itera-tively. The direct search starts from an initial point. A better solutionis sought both along the DVs, to discover the pattern of the objectivefunction, and along the direction of the discovered ... rounds, the firstdirect search was started from the best solution of the previous round. The other 10 direct searches began from the best of 5000 random com-binations of decision variables. The...
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Báo cáo lâm nghiệp: "Predicting the environmental thresholds for cambial and secondary vascular tissue development in stems of hybrid aspen" pptx
... iscrossed once more as the season of the year changes. In the context of the inter-relationship between the tree and its environment, it is of interest to discover which of the manypotentially informative ... inresponse to any one of these variable alone [9]. The seasonal cycles of growth and development of temper-ate tree species are responses to variations in the ambient, abi-otic environment ... raisesa problem of how best to sample them for analysis. Their dis-tribution suggests that the development of one group of fibresprecludes the development of another group in the immediatevicinity....
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Báo cáo lâm nghiệp: "Optimising the management of Pinus sylvestris L. stand under risk of fire in Catalonia (north-east of Spain)" ppsx
... the integration of the risk of forest fires in the decision-making process of forestry. In this context, the stand level offers the first meaningful level of decision making where the risk of fire ... However, these studies only evaluated the effect of the risk of fires on the optimal rotation age of the stand. In all these stud-ies thinnings were ignored and risk was considered as constantor ... m and 2 thinnings (Fig. 4): the higher the fire risk and the discounting rate, the shorter was the optimal rotation and the lower was the SEV. The rotation variedfrom 105 y under no risk of...
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Báo cáo lâm nghiệp: "Assessing the nutritional and climatic response of temperate tree species in the Vosges Mountains" doc
... The closer the eigenvalues of the m firstaxes of CCA are to the m first axes of CA, the greater the efficiency of environmental variables and the closer em is to 1. The efficiency of the different ... ordination axis of CCAor CA and em can be considered as the empirical index that measures the efficiency of the ecological variables used in E for predicting the composition of the vegetation. The ... response of tree species in the Vosges Mountains 767hand, the better relationship between the composition of shrubs, herbaceous species and bryophytes and the nutritionalvariables measured at the...
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Báo cáo lâm nghiệp: "Modelling the demographic sustainability of pure beech plenter forests in Eastern Germany" pot
... depends on this particular variable. The concentration of the yield on large timber and consequentially the minimising of small timber is deemed to be one of the biggest advantages of the plenter ... otherwise the standing volume would increase and change the relation-ship of growth. The distribution pattern of the removal rate over the d-class depends on the silvicultural need for selection and nurturing ... individualisation and to shade than conifers,because of differences in space occupancy and their reaction to shade. Therefore application of the plenter system (or selection system) presentsother constraints...
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