Báo cáo lâm nghiệp: "Frost resistance of seeds in Mediterranean oaks and the role of litter in the thermal protection of acorns" docx

... freezing and exotherm profiles for the four species studied (in increasing order of frost resistance) . Exotherms represented are obtained from mean values of starting point, width and duration of ... leaf litter cover which protected acorns during winter. The insulating role of leaf litter along a winter season in a Q. faginea stand in the Zaragoza province was...

Ngày tải lên: 08/08/2014, 01:22

... both the minimum and the maximum number of years of a land unit debark- ing cycle and the timing of the first debarking for each land unit. In order to run this model the prescription simulator interprets ... encompasses the defini- tion of both the debarking cycle for each tree in the land unit and the thinning regime. The prescription simulator may cons...

Ngày tải lên: 08/08/2014, 00:22

... for the damage levels observed. To complete our under- standing of the effect of damage and consequently our under- standing of the effect of late frosts we need to carry out the same kind of “cohort ... height of 50 cm were all of the same local origin (Arques state forest in Normandy). During the night of 14/15 May 1995, a frost affecting the whole of France...

Ngày tải lên: 07/08/2014, 16:20

... collected in 1973 and the seeds were extracted from them in the extraction plant Wolfgang in Hessia. After cleaning, dewinging and drying, the seeds were stored there in sealed containers at a ... germinated seeds were planted into the boxes with moist perlite and placed in the Jacobsen tank at the same level as the germinating seeds, in the same condi...

Ngày tải lên: 08/08/2014, 00:21

... mass loss rather than the mean in interpreting the results improves the reproducibility of the results, and reduces the impact of singular results that can- not be explained [49]. The median mass ... is darker and redder in the outer heartwood and at the base of the tree. 4.Decay resistance decreases from the outer to the inner heartwood. Variations fro...

Ngày tải lên: 08/08/2014, 01:21

... walls as these may facilitate the maintenance of cell integrity during the rehydra- tion occurring after the drought ends. In contrast to SS plants, CS plants experienced an increase in the θ and ... topsoil of medium texture, and sand (3:1) (v/v) on August 1999. Seedlings were maintained during the whole experiment in a glasshouse located in the experimental field...

Ngày tải lên: 07/08/2014, 16:20

... 33, 55, and 65% of total N, 6, 15, 15, and 24% of P 2 O 5 , and 9, 16, 34, and 51% of K 2 O released from the fertilizer during the first 13, 20, 27, and 35 weeks, respectively. During the approximately ... period of the present study, 55% of the fertilizer released by weight and 73% of total N, 26% of P 2 O 5 , and of 63% of K 2 O released. This was...

Ngày tải lên: 08/08/2014, 01:22

... units in one direction, most often into the prevailing wind. Strip width is generally set at four times the average dominant height of the target for- est stand. For this site, a total of 58 ... NB(i) as the index number of a strip adjacent to the i-th strip against the pre- vailing wind. en, after completing the recursive operation four times – for the two-cut sys...

Ngày tải lên: 07/08/2014, 10:21

... between the stem volume and the diameter at breast height. e method of measuring the diameter at a certain height of the tree is also appropriate for the sorting in standing trees. For sorting ... calculating the volume in forests (virgin forests) where the yield tables do not exist or for the revision of the existing tables. e stem is divided into parts an...

Ngày tải lên: 07/08/2014, 10:21

... characteristics independently, in order to evaluate their relative in uences on wood density. For the first set of simulations, all the variables in the model were fixed to values they take at the beginning of ... MMD a decreased within the first half of a tree-ring; then it reached a plateau, and remained constant in the second half of the tree-ring (Fig. 2B). Cor...

Ngày tải lên: 07/08/2014, 16:20