Báo cáo lâm nghiệp: "A dendroecological study in a declining

Báo cáo lâm nghiệp: "A dendroecological study in a declining coppice stand E Amorini M Biocca a" pdf

... correlated; March and April mini- mum temperatures, May and June maximum temperatures, July and August maximum temperatures are negatively correlated (table V). The same ... 191-254 Original article A dendroecological study in a declining oak coppice stand E Amorini M Biocca a MC Manetti E Motta 1 Istituto Sperimentale per la Sel...

Ngày tải lên : 08/08/2014, 18:21

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Báo cáo lâm nghiệp:"The extreme drought in the 1920s and its effect on tree growth deduced from tree ring analysis: a case study in North China" ppsx

... typical continental and semiarid temperate steppe climate predominates in the Xilin River Basin [6]. Winter is cold and dry, while summer is warm and wet. The mean annual temperature was about –0. ... found around the typical steppe. Thus, a tree-ring database covering a broad range of spatial and temporal scales may provide an alterna- tive approach to assess and understand the stand...

Ngày tải lên : 08/08/2014, 01:21

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Báo cáo lâm nghiệp: "Seasonal ionic exchange in two-layer canopies and total deposition in a subtropical evergreen mixed forest in central-south China" pps

... data based on the three-year observations may reduce the yearly variability and increase the accuracy to ex- amine the dynamics of nutrients in forest ecosystems. Acknowledgements: The study was ... stemﬂow to the total ﬂux, in general, is less than 10% [10, 22]. The estimates of canopy exchange via throughfall measurements are, therefore, to be underestimated or overestimated. Draaijer...

Ngày tải lên : 07/08/2014, 16:20

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Báo cáo lâm nghiệp: " Influence of environmental conditions on radial patterns of sap flux density of a 70-year Fagus crenata trees in the Naeba Mountains, Japan" ppsx

... shaded canopies indicate the measurement trees. Table I. General characteristics of the investigated Fagus crenata trees at 900 -m elevation in the Naeba Mountains, Japan. Tree No. Tree diameter at ... one another as possible. The sensors were installed between the end of April before the leaves flushed. The sensors were removed in November after leaves had fallen to avoid damage by hea...

Ngày tải lên : 08/08/2014, 00:21

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Báo cáo lâm nghiệp: "Carbon stock changes in a peaty gley soil profile after afforestation with Sitka spruce (Picea sitchensis)" potx

... 2000 and 2001. The research was under- taken in stands of different ages to represent the continuum of stand development since initial afforestation, an area where a mature stand had been clearfelled, ... clearfelled and the planting of trees takes place after two or three years. Tree harvesting is conducted by mechanical har- vesters with a mechanically operated harvesting head tha...

Ngày tải lên : 08/08/2014, 00:22

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Báo cáo lâm nghiệp:" Dynamics of litterfall in a chronosequence of Douglas-fir (Pseudotsuga menziesii Franco) stands in the Beaujolais mounts (France)" potx

... litterfall to the stand nutrient uptake increased with stand age as a result of three main factors: (i) The amount of litterfall tended to decrease after the maximum current annual increment (MCI) ... increased with stand age, tending to decrease the mean annual immobilization in the ligneous compartments. Return by litterfall is an important mechanism in the inter- action betwe...

Ngày tải lên : 08/08/2014, 01:21

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Báo cáo lâm nghiệp: "Ecological light measurement in forests using the light degradation effect in hydrogenated amorphous silicon(a-Si:H)" pot

... the aluminium contacts of the samples during the current measurements. Experimental test in forest Immediately after completing the first measuring step four samples were ... fact that the samples at the measuring points exposed to the greatest amount of radiation had already reached maximum defect density before the tests had been completed and,...

Ngày tải lên : 08/08/2014, 18:21

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Báo cáo lâm nghiệp: " Mating system parameters in a natural population of Abies borisii regis Mattfeld" pdf

... genotypes when one or both alleles of the maternal genotype are omitted from the data. In MLTF, mating system parameters are estimated by maximum likelihood and stan- dard ... maternal and paternal alleles can be identified from megagametophytic and embryo tissues in seeds from gymnosperms: the most likely maternal genotype is assigned from megag...

Ngày tải lên : 08/08/2014, 18:21

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Báo cáo lâm nghiệp: "Assessment of the effects of below-zero temperatures on photosynthesis and chlorophyll a fluorescence in leaf discs of Eucalyptus globulu" pps

... the fluorescence decrease kinetics to reach the final stea- dy-state fluorescence, which is well expressed by the decrease in R fd values when treatment temperatures declined, ... were recorded when the treatment was at -5°C. Comparing the percentage of tissue necrosis, measured 1 wk after the treatment, with R fd values gave rise to a li...

Ngày tải lên : 09/08/2014, 04:20

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Báo cáo lâm nghiệp: "Extraction and study of enzymes linked to malate metabolism in tree leaves" pdf

... activity. Discussion Spruce needles and oak leaves possess potential NAD- and NADP-malic enzyme activities. NAD-malic enzyme has an absolute requirement for Mn2+ , whereas NADP-malic enzyme can work ... mitochondrial markers: fumarase implicated in the tricarboxylic acid cycle and NAD-malic enzyme which generates pyruvate internally. By contrast, NADP- mal...

Ngày tải lên : 09/08/2014, 04:20

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