Báo cáo lâm nghiệp: "Growth of hybrid poplars in silviculture at the age of 6 years" pps

... to the low age of poplar plantation, the eval- uated clones were divided into two groups: – A. group of candidate clones yielding more than cultivar 'I-214' at the age of 6 years in ... clones) at the age of 6 years. Survival rate of 11 clones was 91 .6% of individuals and survival rate of only 2 clones was 83.3%. Trees in border rows der...

Ngày tải lên: 07/08/2014, 10:21

... initiation of an extensive research focused on monitoring the population dynamics of rodents in forest environment, their feeding behaviour and the damage they cause. At the beginning of the ... half of the foresters concluded that the existing possibilities of plantation protec- Fig. 2. Distribution of damage according to the composition of the herb lay...

Ngày tải lên: 07/08/2014, 03:22

... considering the change in climate water balance in forest altitudinal zones was suggested, using the actual growth rates 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 and the shift in the relation of prices and costs have been regarded as fac...

Ngày tải lên: 07/08/2014, 10:21

... data to differentiate between genetically compatible and incompatible parents for a given offspring. In this case, the selfing rate was obtained computing the percentage of established offspring ... méditerranéenne 1. INTRODUCTION The mating pattern of a species determines partly the distri- bution of genotypes within populations and influences the degree of differentiatio...

Ngày tải lên: 08/08/2014, 01:21

... through the evolution of the variables over time. At the beginning of the experiment, the mean tree was lar- ger in the control treatment, but after thinning and through the three inventories, the ... initial height of the tree as covariant. 3.2. Stand development and structure The main stand variables per plot at the beginning of the experiment and the...

Ngày tải lên: 08/08/2014, 01:22

... presence in the vicinity of the tree base (Tab. I). This is due to the fact that in order to minimize tree damage with the machinery, the area at the base of the tree is often left uncul- tivated. ... among the measurements made at the tree base and those made between the planting rows. PRS-probes analysis indicated that the H and LH treatments increased the...

Ngày tải lên: 07/08/2014, 16:20

... development in the studied period shows quite a stable situation in the codominant (main) layer while trees belonging to class 3 have slimmer stems. However, data indicate that a silvicultural intervention ... 4.1 264 J. FOR. SCI., 55, 2009 (6) : 264 – 269 JOURNAL OF FOREST SCIENCE, 55, 2009 (6) : 264 – 269 Actual silvicultural and management regimes should ensure the sustai...

Ngày tải lên: 07/08/2014, 03:22

... the sun that indicate partial photoinhibi- tion.  e higher photosynthetic electron transport rate (ETR) evaluated at the increasing intensity of photosynthetically active radiation (PAR) in ... higher dry matter of leaves per 1 plant were de- termined in seedlings grown in the sun. The average area of one leaf was larger in seedlings grown in the shade. The hi...

Ngày tải lên: 07/08/2014, 10:21

... concentrations of St at the beginning of autumn [2], coinciding with the date of harvest in our study, while ever- greens do so at the end of winter, just before bud break [14]. In the case of N, the larger ... coccifera [ 26] . Thus, the rate at which C uptake increased with increasing water supply might be more limited by stomatal conductance in the ever-...

Ngày tải lên: 07/08/2014, 16:20

... composition of the radiation below the canopy. In particular the ratio of the red components of radiation to those of the far red (R/FR-ratio) is altered below the crowns of the canopy trees due to the ... length (in cm respectively)) and the dry mass of the main stem (DM shoot ) at the end of the experiment, the dry mass of the main stem at...

Ngày tải lên: 08/08/2014, 01:21