Báo cáo lâm nghiệp: " Effects of polyaromatic hydrocarbons on the forest ecosystem and woody plants" pot

... Studies of the effects of phenanthrene, fluoranthene and pyrene were made on lupin mitochondria.Fig. 1 shows the effects of fluoranthene on lupin root and green cotyledon mitochon-dria. ... and chlorophyll degradation and could beconsidered as a new kind of senescence-inducing hormone. The problem of the presence in the atmosphere of organicpollutants of ... Effects of polyaromatic hydrocarbons on the forest ecosystem and woody plantsM. BerteigneC. RoseJ. Gérard2P. Dizengremel21 Laboratoire d’Etude de la Pollution Atmospherique,...

Báo cáo lâm nghiệp: "Effects of artificial damage on the branching pattern of Nothofagus dombeyi (Nothofagaceae)" ppsx

... assessing the effects of treatments and trees on the position of the most proximal offs-pring shoot, the diameter, length and number of nodes of the largest (max.) offspring shoot, the MDR, MLR and ... at the level of the parent shoot. On the other hand, clipping a complete distal offspring shootat the peak of its extension period increased the length and number of nodes of another distal offspring ... position on the parent shoot of the most proximal offspring shoot, (2) diameter of the thickest offspring shoot, (3) length of the longest offspringshoot, (4) number of leaves of the largest offspring...

Báo cáo lâm nghiệp: "Effects of light intensity on the growth and energy balance of photosystem II electron transport in Quercus alba " potx

... estimate of the flux of elec-trons through PS II via the ETR. There was a clear separation of irradiance response due to growth irradiance acclimationamong the seedlings. As 1–qP approached 1, the ... estimate of the conductance of the photosyn-thetic apparatus [44]. The large drop in the ratio seen at lowPPFD in FL plants and slightly evident in HS plants, was aresult of a large reduction in the ... (1989)87–92.[17] Glitzenstein J.C., Canham C.D., McDonnell M.J., Streng D.R., Effects of environment and land-use history on upland forest of the Cary Arboretum, Hudson Valley, New York, Bull. Torrey Bot.Club...

Báo cáo lâm nghiệp: "Effects of seedling density on the growth of Corsican pine (Pinus nigra var. maritima Melv.), Scots pine (Pinus sylvestris L.) and Douglas-fir (Pseudotsuga menziesii Franco) in containers" ppt

... thank the staff of the nurseries at AliceHolt Lodge and the Northern Research Stationfor raising the container seedlings, and the staffrooting volume held constant, ... third grow-ing season. There was a high Hylobiuspopulation during the first two seasons,which was responsible for some of the losses.By the end of the third year after ... has a stronginfluence on the growth and development of Corsican pine, Scots pine and Dou-glas-fir. The relationship between pro-duction of biomass, total and shoot dryweight...

Báo cáo lâm nghiệp: " Comparison of deposition fluxes on the open area and in mountain spruce stands of different density" pdf

... of the studied stands. Water intercepted by the stand canopy of the sparse stand was vaporized faster than in the dense stand, the accumulation and consequen-tial conﬂux of water below the ... both in the precipitation amounts and in the annual distribu-tion of precipitation. A linear relationship between the amount of rainfall on the open area and the amount of throughfall in the ... Mainly the interception of horizontal precipitation is important in mountain forest stands. us the lower amount of water penetrated onto the forest ﬂoor in the sparse stand. From the statistical...

Báo cáo lâm nghiệp:" Effects of competing vegetation on juvenile white spruce (Picea glauca (Moench) Voss) growth in Alaska" pdf

... plant-ing and at the end of each of the first 5 growing seasons. BonanzaCreek seedlings were also measured at the end of the sixth, ninth, and eleventh growing seasons, and Fort Richardson seedlings ... height and diameter through time. Orthogonal and non-orthogonal contrasts were used to test for treatment and unit effects. These contrasts tested for slope differences among the equations,which ... Rich-ardson), and combinations of these variables (46 variables forBonanza Creek and 74 for Fort Richardson). From these analyses, wegenerated a list of 10 potential independent variables for further...

Báo cáo lâm nghiệp: " Effects of tree species on understory vegetation and environmental conditions in temperate forests." pps

... in 26 locations. Within each location the stands had the same soil condition, landscape position and previous land-use history. Ground vegetation and soil were sampled in each stand. The tree species ... Effect of stand age There was no significant effect of the “age” factor, or inter-action between the stand age and tree species.4. DISCUSSION4.1. Validity of the tree species comparisonThere ... conditions, previous land use and eco-logical conditions (slope, exposition, landscape position) of the dif-ferent stands within a site were identical. In most cases, stands within the same...

Báo cáo lâm nghiệp: "Effects of silviculture treatments on vegetation after fire in Pinus halepensis Mill. woodlands (SE Spain)" ppt

... scrubbing because of its high combustibility potential [42] and competition effects on germination of therophytes describedby Pausas et al. [32].As a conclusion to this study, in spite of the intense ... Decrease of intra- and inter-specific competition effects must be considered for forestersin managing of early stages of succession after fire. When it’sconsidered both vegetation responses to ... Naveh and Kutiel [28] and Wilson et al. [44]. Dominancy of thero-phytes during the early stages of succession after fire and theirscarcity in mature stages have been observed in Mediterraneanforests....

Báo cáo lâm nghiệp: "Effects of phosphate deficiency on photosynthesis and accumulation of starch and soluble sugars in 1-year-old seedlings of maritime pine (Pinus pinaster Ait)" doc

... the convexity of the quantum response of the potential electron transport of needles and wasfixed at 0.79 (Leverenz and Jarvis, 1979). a is the initial slope of the quantum ... nostudies on the effects of P deficiency on CO2 assimilation rate in this species. In thispaper, we determined the effects of P defi-ciency on the photosynthesis and non-structural ... and consequently, carbon immobilization. How-ever, little is known about the effects of phosphorus deficiency on carbon assimila-tion in forest tree species (Ericsson and...

Báo cáo lâm nghiệp: " Effects of water deficit on leaf in fast-growing tree species growth and initiation" docx

... al.,1987).Most of our knowledge on the growth of tree seedlings to date comes from fieldexperiments such as the above. In orderto further our understanding of seedlinggrowth, the ... result of more than purely a cessation of growth. Our current studies suggest thatleaf initiation is important and, as demon-strated in Fig. 3, the initiation of newleaves ... patterns of juve-nile E. globulus have been investigatedunder conditions of water deficit, inconjunction with detailed measurements of gas exchange.Materials and MethodsExperiments...

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