Báo cáo lâm nghiệp: "Use of stem diameter variations for detecting the effects of pathogens on plant water status" pptx

... plugs of PDA only. At the end of the experiment isolations were made from all the plants to confirm the presence of the pathogens in the inoculated plants. Reisolations were ... decrease in stem diameter, which corresponds to the extension of the cankers and finally the death of the plants. The relations between the global...

Ngày tải lên: 08/08/2014, 18:21

... concerning the significance of the individual species is in contradic- tion with the information the foresters provided on the distribution of damage which is the greatest on grass-covered clearings ... forest environment, their feeding behaviour and the damage they cause. At the beginning of the research, we conducted a survey among foresters in the form of...

Ngày tải lên: 07/08/2014, 03:22

... level of uncertainty of natural, economic and social conditions during the long for- est production cycle. If the information about goals, solution variants and their consequences, and the information ... of tree species situated in lower sites for the estima- tion of their future growth on the basis of ecological analogy. Both, the change in climate conditions...

Ngày tải lên: 07/08/2014, 10:21

... the PWN [16]. Therefore, determination of the northern limit for distribution and forecast of potential dispersal regions of the beetle has important significance in the management of the pine wood ... in the field, in theory the disease is likely to extend farther and even exceed the distribution range of the beetle. The beetle is one of the most important v...

Ngày tải lên: 07/08/2014, 16:20

... substitu- tions, the equation (2) is constrained to estimate the dominant height of the stand when the diameter at breast height of the sub- ject tree equals the dominant diameter of the stand. Thus, the ... to make predictions for data from the other ecoregion. The mean error was calculated as follows: where n is the number of the predictions in the ec...

Ngày tải lên: 08/08/2014, 00:22

... transition functions to define the rate of change of the system depending on the current state of the stand; and finally some control functions to regulate the modifications of the values of the main ... all the solutions of equations (3) to (5). The differential equation (3) implies that the relative rate of change in the number of stems is proportiona...

Ngày tải lên: 08/08/2014, 01:21

... depend on the general architecture of the tree root system. Considering the potential plasticity of the root system architecture in response to the soil environment, the evaluation of the usefulness ... as the ratio of the square of root diameter before bifurcation ( ) to the sum of squares of the diameters of bifur- cating roots (Σ ): . (1) The all...

Ngày tải lên: 08/08/2014, 01:21

... technique was there- fore undertaken to estimate the components of the residual variance of the non-linear least-square global model, i.e. the additional sources of variations, once all of the covariates ... calibrated for one region can not be used in another one: on the scale of an interregional observation, a sig- nificant portion of branch diameter variance...

Ngày tải lên: 08/08/2014, 01:22

... the condition number of the correlation matrix for the partial derivates with respect to each one of the parameters. The condition number is defined as the largest condition index, which is the ... while the difference form of the Richards equation with n as the free parameter was selected for diameter growth. These models increase our knowledge of the grow...

Ngày tải lên: 08/08/2014, 00:22

... microsatellite regions. The high conservation of the chloroplast genome permitted the design of (a few) conserved primer pairs for the study of mononucleotide repeats variation in angiosperms ... selection of all motifs of at least seven repetitions), there was a positive relationship between the variability of the loci (number of alleles per locus) and the maxim...

Ngày tải lên: 08/08/2014, 01:22