Báo cáo lâm nghiệp: "Eﬀects of drought and heat on forest in

Báo cáo lâm nghiệp: "Eﬀects of drought and heat on forest insect populations in relation to the 2003 drought in Western Europe" ppt

... insect populations in the context of this exceptional event. Observations of changes in population levels of the main European forest insect pests during and after the drought are presented and ... prolonged drought on bark beetles The success of the establishment of bark beetle populations on their host tree depends, on the level of the...

Ngày tải lên : 07/08/2014, 16:20

12
452
0

Báo cáo lâm nghiệp: "Eﬀects of microsite variation on growth and adaptive traits in a beech provenance trial." pps

... grid and their values for the positions of individual trees were estimated by ordinary point kriging. The evaluation of phenotypic variation (height, diameter, Julian days of spring flushing and ... for the modelling of autumn discoloration.  e length of the vegetation period was then assessed as the diﬀ erence between the midpoints of autumn discoloration an...

Ngày tải lên : 07/08/2014, 10:21

8
364
0

Báo cáo lâm nghiệp: "Eﬀects of selective thinning on growth and development of beech (Fagus sylvatica L.) forest stands in south-eastern Slovenia" docx

... of crop trees in the young stands and al- teration of crop trees caused one of the main weaknesses of the selection thinning type, namely, high costs. In the total stand tending costs, thinning ... Before the last thinning in 2001, the growing stock of the control stands C1 and C2 was 23% and 18% higher compared to the growing stock of the thinned s...

Ngày tải lên : 07/08/2014, 16:20

11
365
0

Báo cáo lâm nghiệp: "Eﬀects of the clear-cutting of a Douglas-ﬁr plantation (Pseudotsuga menziesii F.) on the chemical composition of soil solutions and on the leaching of DOC and ions in drainage waters" pps

... mechani- sation of the thinning, harvesting and regeneration operations result in constraints to the physical, chemical and biological properties of the soil [21]. On the other hand, remediation is technically ... composition of soil solutions and on leaching of nutrients in drainage waters were observed by a continuous monitoring, six years before and three...

Ngày tải lên : 07/08/2014, 16:20

18
416
0

Báo cáo lâm nghiệp: "Eﬀects of soil mechanical treatments combined with bramble and bracken control on the restoration of degraded understory in an ancient beech forest" pptx

... carried out in forest conditions (but see [10, 20, 38]). Moreover, studies investigating the eﬀect of tillage on bulk density and water in ltration have led to con- tradictory and inconclusive ... according to the Indicator Species Analysis with a Monte Carlo test of signiﬁcance (1000 permutations). The table shows the indicator value of each species (% of perfe...

Ngày tải lên : 07/08/2014, 16:20

11
452
0

Báo cáo lâm nghiệp: "Eﬀects of resource availability on condensed tannins and nitrogen in two Quercus species diﬀering in leaf life span" doc

... mg of leaf powder with 70% acetone. Tubes containing the sample and the acetone were sonicated three times for 1 min allowing the tubes to cool for three minutes between successive sonications. ... shade cloth to 8% of the naturally incident PAR for the low-light environ- ment (L8) and to 36% of the incident PAR for the high light envi- ronment (L36), in order...

Ngày tải lên : 07/08/2014, 16:21

7
411
0

Báo cáo lâm nghiệp: "Eﬀect of Melampsora larici-populina on growth and biomass yield of eight clones of Populus nigra" ppsx

... 0.05) in infection from clones 7, 107, 110, 152.  e stability of the intensity of infection of black poplar clones by the rust (the rank of clones according to the intensity of infection) ... t-test Table 5. Increments of stem diameter and plant height from the beginning of vegetation to the ﬁ rst rust incidence (beginning of July 2007) and their p...

Ngày tải lên : 07/08/2014, 10:21

9
523
0

Báo cáo lâm nghiệp: "Eﬀect of tree species substitution on organic matter biodegradability and mineral nutrient availability in a temperate topsoil" pptx

... conditions [3, 16, 41]. Taking into account the bulk production of CO 2 -C in mg per kg of soil, the na- tive forest plot mineralized more carbon than the other plots, suggesting that both the ... was determined on one hand, by the nitrate and water- extractable Ca, Mg, and Mn contents, and on the other hand, by the water-extractable Fe and Al contents. This...

Ngày tải lên : 07/08/2014, 16:20

9
368
0

Báo cáo lâm nghiệp: "Eﬀect of an oil heat treatment on the leachability and biological resistance of boric acid impregnated wood" pps

... aqueous solution as follow and then sterilized by autoclave: for White rot fungi, 85 mL of a solution containing 40 g of glucose, 3 g of peptone, 15 g of malt extract and 1 000 mL of distilled ... fungi: 80 mL of a solution containing 20 g of glucose, 1.5 g of peptone, 7.5 g of malt extract and 1 000 mL of distilled water. After inoculating glass jars with fungal cul...

Ngày tải lên : 07/08/2014, 16:21

6
417
0

Báo cáo lâm nghiệp: " Eﬀect of species and ecological conditions on ellagitannin content in oak wood from an even-aged and mixed stand of Quercus robur L. and Quercus petraea Liebl." docx

... castalin, roburin A and C on the one hand and the percentage of vescalagin and vescalagin/castalagin ratio on the other hand. The signiﬁcance of these correlations is that the increase of the total ... total ellagitannin content, vescalagin, castalagin, grandinin and roburin A-E content. The second axis explains 16.1% of the total variation and is relat...

Ngày tải lên : 08/08/2014, 00:22

10
253
0