Báo cáo lâm nghiệp: "Element analysis of tree rings in pedunculate oak heartwood: an indicator of historical trends in the soil chemistry, related to atmospheric deposition" ppsx
Báo cáo lâm nghiệp: "Element analysis of tree rings in pedunculate oak heartwood: an indicator of historical trends in the soil chemistry, related to atmospheric deposition" ppsx
... in Ver-mont. Vt Agr Exp Sta, RR 53, Univ Vt, Burlington,VA, USA, 9 pOriginal articleElement analysis of tree rings in pedunculate oak heartwood: an indicator of historical ... tree- ring analysis on the heartwood of pedunculate oak as an indi-cator of temporal trends in some chemicalproperties of the soil. We worked in a forest included in ... 1938 and 1967. Finally, tree- ring analysis of oak heartwood appeared to be an effective approach to reveal historical changes in forest soil chemistry. tree ring / pedunculate...
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Báo cáo lâm nghiệp: "Paternity analysis of Populus nigra L. offspring in a Belgian plantation of native and exotic poplars" doc
... to mislabelling of the seedling.Microsatellite analysis of the remaining 12 SSR loci re-vealed 11 distinct genotypes in the 16 P. nigra candidate fa-thers in the total poplar stand (Tab. IV) and three ... dataset of the three isozymes and two DNAmarkers (WPMS09 and win3), no genes of P. deltoides weredetected in the total offspring analysed. Isozyme analysis of the 5 progenies resulted in a clear banding ... P.trichocarpa and P. deltoides). Despite the abundance of P. ×canadensis hybrids, no evidence of introgression of genes of P.deltoides in the offspring of P. nigra was detected. Therefore, the results of...
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Báo cáo lâm nghiệp: "Argan (Argania spinosa (L.) Skeels) seed germination under nursery conditions: Effect of cold storage, gibberellic acid and mother-tree genotype" docx
... has to do with the fra-gility of the argan nut contained within the slightly crackedstone and weighing less 5 g in average [15] but rich in lipidsand carbohydrates [15]. Therefore, in the ... [7, 10, 11]. In the present study, applying either GA or cold storageincreased germination, decreased time to germination extend-ing germination period and reduced the number of dormantseeds ... for the purpose of establishing a simple germination procedure adaptable to variousnursery situations. The beginning of germination of argan seeds which, were stored at room temperature in the...
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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
... missing rings rarely occur in this part of the tree. Second, these diagnostic rings were identified on discs sampled lowerdown the tree and their dating allowed us to detect missing rings. The dating ... variables to the model. Then, to determine the variables that played a significant role in explaining the variation of ring width index and annual volumeincrement index, we successively eliminated ... located and inventoried again during the snow-free periods between 1998 and 2002. The inventory consisted in measuring the diameter at breast height (± 1 mm) of each tree largerthan 9.0 cm within the...
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Báo cáo lâm nghiệp: "Aboveground biomass relationships for mixed ash (Fraxinus excelsior L. and Ulmus glabra Hudson) stands in Eastern Prealps of Friuli Venezia Giulia (Italy)" pptx
... mm. The stand occupies an area of 2.4 ha andwas partially used in the past as grassland. The forest is dominated byash (Fraxinus excelsior L.) (number of trees = 77%) with the presence of wych ... 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 ... 0.16and 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 density of the stand andbecause of...
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Báo cáo lâm nghiệp: "doubling atmospheric CO concentration on 2 matter distribution and CO exchange of 2 yr growth, dry 2 old sweet chestnut trees (Castanea sativa Mill.)" pptx
... After the end of July, 62% of the enriched plants ceased growth ascompared with 37% of the controls. The early onset of yellowing and the stopped terminal bud growth indicatesearlier ... for the C02-enriched plants (results not shown). The 28% increase in daily carbonexchange was in approximate agreementwith the 43% increase in total dry matter of C02-enriched ... time in the wholechamber (Gaudillere and Mousseau,1989). During the two 1 st 2 wk, the C02concentration in the chamber was main-tained at 330 ppm. It was then increasedto...
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Báo cáo lâm nghiệp:" Foliar N and P resorption and nutrient levels along an elevational gradient in Juniperus oxycedrus L. subsp. " pot
... h, then weighed dry andthen soil moisture was calculated on a volume basis [9]. The results of soil analysis were explained according to Bayraklý [7].One and two-way analysis of variance (ANOVA) ... mesh prior to analysis. Because soil parameters changed very little during both sampling period soil samples belonging to both sampling period were pooled.2.2. Methods of chemical analysis Leaf ... in the slope and upper topographic positions (150–200 m) where soil Table VI. Mean values for soil paremeters along the topographic position and the comparison of soil parameters by one-way ANOVA...
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Báo cáo lâm nghiệp: "An integrated analysis of 33 Eucalyptus trials linking the onset of competition-induced tree growth suppression with management, physiographic and climatic factors" pptx
... clay in top 15 cm of soil 7 Sand % sand in top 15 cm of soil 8 Silt % silt in top 15 cm of soil 9 Oc % organic carbon in top 15 cm of soil Management related explanatory variables10 SeedlingScored ... method of site preparation (burning versus not burning) and the interaction between these two factors were significantly related to the timing of tree growth suppression. Regardless of the method of ... physical and chemical barrier, reducing the rate of seed germination thereby delaying the onset of inter-specificcompetition. The interaction between the site related vari-ables (PC1 and 2) and method...
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Báo cáo lâm nghiệp: " Decay resistance in Dicorynia guianensis Amsh.: analysis of inter-tree and intra-tree variability and relations with wood colour" pptx
... Dicorynia guianensis.Using the calculation of the median mass loss rather than the mean in interpreting the results improves the reproducibility of the results, and reduces the impact of singular ... heartwood and at the base of the tree. 4.Decay resistance decreases from the outer to the innerheartwood. Variations from the base to the top of the trees areless systematic.5. There is no effect of ... thinner the sapwood, the greater the tree diameter and the lower the decay resistance.3.Colour is related to height and radial position in the tree: the wood is darker and redder in the outer...
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Báo cáo lâm nghiệp: " A collection of functions to determine annual tree carbon increment via stem-analysis" pot
... contains fewer rings than the lower one. This means thatit took the tree a number of years equal to the difference in number of rings to grow up from the lower cross-section level to the upper one ... variability of the density and C contentestimates of wood of the sampled trees. The relative contribu-tion of the error to stem C pool or increment range from 0.67% (tree 7), to 25% (tree I), being ... periodgiven to the prior old-growth forest, lasting from the seedingcut to the last cut of the old-growth trees.Estimated errors associated to C pool and increment aredirectly related to the variability...
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