Báo cáo lâm nghiệp: "How to identify larvae of the protected species: Dioszeghyana schmidtii (Diószeghy 1935), and survey its presence and abundance (Lepidoptera: Noctuidae; Hadeninae)" pot

... ad- vantages of such. MATERIAL AND METHODS To obtain D. schmidtii larvae it is recommended to simply beat the bottom branches of the food- plant up to 3 m above ground level. The larvae of this ... possibilities. (C) Degree of isolation of the population present on the site in relation to the natural range of the species. (D) Global assessment of...

Ngày tải lên: 07/08/2014, 10:21

... less obvious level, the occurrence of reaction wood is linked to the history of tree growth, and in particular to the evolution of its shape where the environmental factors and the competition for ... measurements such as the height, the local tree slope, the eccentricity of the tension wood area, or the eccentricity of the disc are discussed to ill...

Ngày tải lên: 08/08/2014, 01:21

... During storage the containers should be tightly sealed and never opened before the end of storage. Seed moisture content and temperature of storage should be the lower, the longer is the planned storage ... Because of the limited number of seeds, they were stored in one polyethylene bag. When these seeds were used for testing their viability, the bag was opened in t...

Ngày tải lên: 08/08/2014, 00:21

... paths of each tree (eq. [1]) and the true totals and variances of the target variables and the estimates of the totals, respectively. Choice of the auxiliary variable and variance of the estimate As ... individual trees and defined the product of the squared diameter and the length of the branch beginning at the base of the segment, a proxy...

Ngày tải lên: 07/08/2014, 03:22

... Finally, the carbon content (CC) enabled the conversion from total dry mass to total carbon stock. As the aim of our study was to improve the methodology for the calculation of the total carbon stock ... for the most important tree species in the Belgian forests, (ii) to calculate the total car- bon stock in the living biomass of the Belgian forests for the...

Ngày tải lên: 08/08/2014, 00:22

... microdensitometry tends to underevaluate the DNA content of nuclei. To evaluate this fluctuation, we tested five isolation buffers for cytometric assessment of Quercus spp and found ... identi- fied and paired on the basis of C-band pat- terns (Ohri and Ahuja, 1990). These authors also assessed nuclear DNA con- tent by Feulgen microdensi...

Ngày tải lên: 08/08/2014, 18:21

... correspondence be- tween the development of the vascular system of poplar, the growth of the organs and the development of absolute growth rate of the plant. Adaptation proceeds ... analyzed the develop- ment of the vascular system of poplar. The number and the length of the vascular bundles in the vascular cylinder increase...

Ngày tải lên: 09/08/2014, 04:20

... influ- ence of insects’ predation and parasitoids on the total population of the bark beetle was calculated on base of the following mathematic relations. Presumptions of utilize mathematic relations ... rates of parasitoids and its relevance to biological control. L et al. 1994 studied the role of the para- sitism and intraspecific competition in the...

Ngày tải lên: 07/08/2014, 03:22

... difficult factor to consider in relation to the mammalian population regulation without taking into account its interactions with the behaviour and abundance of the prey popu- lation. As the Cg ... M 1991). As to the dynamics of abundance during the 3 years of study the years 2002 and 2004 seem to be similar. As the harvest of seeds in for...

Ngày tải lên: 07/08/2014, 03:22

... forest complexes of southern Moravia depending on the biotope and food supply including the response of the population to the crop of acorns and small- seed trees. MATERIAL AND METHODS e material ... of 0.5 m 2 and the average amount of mast was deter- mined. e plots were selected randomly in the oak stand and the number of acorns was determined on...

Ngày tải lên: 07/08/2014, 03:22