Báo cáo lâm nghiệp: "Micropropagation of hybrid walnut trees

Báo cáo lâm nghiệp: "Micropropagation of hybrid walnut trees (Juglans nigra x Juglans regia) through culture and multiplication of embryos" ppt

... Micropropagation of hybrid walnut trees (Juglans nigra x Juglans regia) through culture and multiplication of embryos D. Cornu C. Jay-Allemand bres Forestiers, INRA, ... France Introduction Walnuts are very valuable trees for nuts and wood production, but we see a reduction in the number of logs available for veneer. Although Pers...

Ngày tải lên : 09/08/2014, 04:20

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Báo cáo lâm nghiệp: "Micropropagation of Eucalyptus dunnii Maid" pot

... (1968) Nutrient requirements of suspension cultures of soybean root cells. Exp. Cell Res. 50, 151-158 Gongalves A.N. (1983) Reversion to juvenility and cloning of Eucalyptus urophylla ... end of 30 d, maximum shoot production occurred at 0.5 mg ’ I- 1 BAP and 0.01 mg ’ I- 1 IBA (Fig. 1). In this treatment, an average of 10 shoots develope...

Ngày tải lên : 09/08/2014, 04:20

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Báo cáo lâm nghiệp: "Predicting balsam fir growth reduction caused by spruce budworm using large-scale historical records of defoliation" potx

... other sources of interannual variation of ring width index are not included in the model. Past- and cur- rent-year temperature and precipitation are examples of such variables that can explain a large ... fir trees were then selected in the vicinity of the plot at a distance of at least 25 m. These trees were harvested and sample discs (3-cm thick) were cut at 0.15, 0.60,...

Ngày tải lên : 08/08/2014, 00:21

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Báo cáo lâm nghiệp: "Using past growth to improve individual-tree diameter growth models for uneven-aged mixtures of Pinus sylvestris L. and Pinus nigra Arn. in Catalonia, north-east Spain" doc

... error of 0.15, and 19 trees for an error of 0.10; for P. nigra at least 6 trees are required to keep the error under 0.20 with a probability of 95%, 11 trees for an error of 0.15, and 26 trees for ... area of trees larger than the subject tree and thinned during the next 10-year period (m 2 ·ha –1 ), G is stand basal area (m 2 ·ha –1 ), and GI is the stand growth...

Ngày tải lên : 08/08/2014, 01:21

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Báo cáo lâm nghiệp: "Multifunctional forestry practices as a land use strategy to meet increasing private and public demands in modern societies" ppt

... Forest and Landscape Research Institute. JENSEN F.S., 1993. Landscape Managers’ and Politicians’ Perception of the Forest and Landscape Preferences of the Population. Forest and Landscape ... increases. Wood production and the use of wood products imply a largely neutral production and consumption cycle with regard to emissions of carbon dioxide. Expanding the forest...

Ngày tải lên : 07/08/2014, 03:22

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Báo cáo lâm nghiệp: " Game damage to forest trees" ppsx

... potas- sium, sodium and cobalt. RESULTS AND DISCUSSION We performed chemical analyses of the bark of damaged and undamaged trees and we analyzed the changes in the content of nutrients and elements ... development and occurrence of hoofed game were investigated by J et al. (1999). Trees with damaged bark usually suﬀer from the penetration of fungi spores...

Ngày tải lên : 07/08/2014, 04:20

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Báo cáo lâm nghiệp: "Differences in fine root traits between Norway spruce (Picea abies [L.] Karst.) and European beech (Fagus sylvatica L.) " potx

... values of pH that might be related to an exposure of the area to high air pollution in the past. e complex of studied stands belongs to the Abieto-Fagetum forest type. Two neighbouring stands ... 36.5 cm, age of about 80 years. Stocking of the stand was 0.8. Mean tree height of beech in the main canopy was ca 27.5 m, mean dbh 33.0 cm, age of nearly 90 years. Stocking of...

Ngày tải lên : 07/08/2014, 10:22

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Báo cáo lâm nghiệp: "Variation in wood volatile compounds in a mixed oak stand: strong species and spatial diﬀerentiation in whisky-lactone content" pptx

... part of France [2, 31]. The stand is included in a continuous forest of 700 ha, consisting mostly of naturally regenerated mixed stands of Q. petraea and Q. robur. The sampled stand covers approx- imately ... total of 286 standing trees. It consists of three ecological zones: a small valley, a plateau and a regular intermediate slope. The plateau is covered by a well drained...

Ngày tải lên : 07/08/2014, 16:20

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Báo cáo lâm nghiệp: "Can understory vegetation accurately predict site index? A comparative study using floristic and abiotic indices in sessile oak (Quercus petraea Liebl.) stands in northern France" ppt

... predicted and observed mean values; Test 2) an ANOVA that compared the following two models: y = x and y = ax + b, with y = observed site index and x = predicted site index, to detect if site index prediction ... vegetation and site productivity in mature stands of Pinus sylvestris in southern Finland. Using a comparable method, the first ordination axis of a detrended corresp...

Ngày tải lên : 08/08/2014, 00:22

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Báo cáo lâm nghiệp:"Root biomass distribution under three cover types in a patchy Pseudotsuga menziesii forest in western Canada" pptx

... stand, the distribution of trees of different ages and sizes was very irregular. The selective harvest removed most of the sparser patches of large trees and left denser patches of undersize trees. ... choice of hydraulic excavation tech- niques restricted our excavation area to that which was within reach of the hose, which was limited by the power of the pump and...

Ngày tải lên : 08/08/2014, 01:21

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