Báo cáo lâm nghiệp: "Steep slopes promote downhill dispersal of Quercus crispula seeds and weaken the fine-scale genetic structure of seedling populations" doc

... on the steep slopes was that the dispersal routes of some of the seeds crossed, thereby merging the seed shadows of the mother trees. In conclusion, most seeds of Q. crispula are dispersed downhill ... 10.1051/forest:2007017 Original article Steep slopes promote downhill dispersal of Quercus crispula seeds and weaken the fine-scale genet...

Ngày tải lên: 07/08/2014, 16:21

... Mill.) and sycamore (Acer pseudoplatanus L.). e analysis of the structure of the number of trees (Fig. 4) may prove that in the species composition of a mature stand (in 2003) beech is the ... evidence of the loss in the fir volume and the increase in beech volume was collected. – However, the increasing share of beech, accompa - nied by a decrease in t...

Ngày tải lên: 07/08/2014, 03:22

... marks, the decisive part of the population abandoned the place of feeding. C. abie- tis showed the most balanced proportion between wintering imagos and abandoned feeding marks. Members of the ... colonizes the crown top part of the stem and the thick branches. e decreased quality of the phloem (high water content) is probably the reason behind the i...

Ngày tải lên: 07/08/2014, 03:22

... strips were eligible for harvest at the beginning of the fi rst period. Of these strips, 234 were cut in the fi rst period, 271 in the second, and 279 in the third (Table 1).  e remain- ing ... economic impact of green-up constraints in the Southeastern U.S.A. Forest Ecology and Management, 145: 191–202. B K., P. B (2006): An economic and landscape ev...

Ngày tải lên: 07/08/2014, 10:21

... information, and diameter-distribution models offer the stand diameter structure, but stand-level outputs from these two types of mod- els often suffer from an accumulation of errors and subsequently ... predict ˆ C Dg , ˆ C Dm , ˆ C Dsd , ˆ min C D and ˆ C N ; and then Weibull parameters b and c were estimated using the stand variables of the forecast combination...

Ngày tải lên: 07/08/2014, 10:22

... (L1) and even 1 to 15 (L2). For L1 damage, there is a very significant concordance be- tween the respective ranks of the clones used in the different places, and in the reactions of the clones to the ... par.) and those without them (No par.). Another advantageous result for the selector lies in the sus- ceptibilities of clones with the same fathers and/ or mother...

Ngày tải lên: 07/08/2014, 16:20

... and SEE denote respectively the coefficient of determination, the standard error for the coefficients a and b and the standard error of the estimate for 38 (ash) and 10 (wych elm) degrees of ... 0.16 and b = 2.34) and for Ulmus americana (a = 0.082 and b = 2.46). Leaf area index is lower than values reported by Kimmins [10] probably because of the high densit...

Ngày tải lên: 08/08/2014, 00:22

... seedlings and whether any of the seedlings noted in the first sampling had died. The location of each seedling in the concentric plots was related to the projection of ... times that of the radius of the canopy of the reserve tree. A detailed inventory of the seedlings and shoots in these concentric areas was also made so...

Ngày tải lên: 09/08/2014, 04:20

... evaluated on a skid trail in the natural forest of north of Iran. Combination of two levels of slope < 20% (SC1) and > 20% (SC2) and three levels of traffic (one, five and nine traffics) were studied. ... forest of Iran; soil compaction 282 J. FOR. SCI., 56, 2010 (6): 278–284 travel speed and the power of the machine are lim- ited and accrued rutting and mixi...

Ngày tải lên: 07/08/2014, 03:22

... both in the gaps (92.8% of the cover and 85.7% of the total species, Tab. V) and under forest (84.2% of the cover and 83.1% of the total species). The mean number of annual species in the community ... and therefore the total number of species is the sum of the two surveys and the cover is the maximum of the two. The soil characteristics w...

Ngày tải lên: 08/08/2014, 00:22