Báo cáo lâm nghiệp: " Primary productivity of a" pot
Báo cáo lâm nghiệp: " Primary productivity of a" pot
... effect of water stress on net stand productivity (Monteny, 1987). The coefficient of conversion from carbon dioxide to dry matter is 0.56 g DM-g C02 !. The annual evolution of ... attenuation of solar radia- tion by clouds from the ITC and the deple- tion of soil water at the end of the short dry season; 3) October-November: the physiol...
Ngày tải lên: 09/08/2014, 04:20
Báo cáo lâm nghiệp: "Small mammals of a forest reserve and adjacent stands of the Kelečská pahorkatina Upland (Czech Republic) and their effect on forest dynamics" pps
... stand and a certain level of resistance to the impact of small rodents in spite of unfavourable years of the total disposal of seed crop. In addition to the eff ect of small mammals on stands ... of the Statistica.cz version 8 programme. e t-test was used for independent samples (comparisons of the weight of animals, diversity of two sites and rel- ative abundance...
Ngày tải lên: 07/08/2014, 10:21
Báo cáo lâm nghiệp: "Energy consumption of a chipper coupled to a universal wheel skidder in the process of chipping wood" pptx
... share of dust and the sharpness of cutting is decreased. e overhang of knives from the plane of the disc defines the prede- termined length of chips, which directly influences the length of chips ... the type, moisture and qual- ity of wood, lock and cutting angle of knives, angle of the contact, cutting speed, length of the slotted hole and feeding speed of wooden ma...
Ngày tải lên: 07/08/2014, 10:21
Báo cáo lâm nghiệp: "The role of Hylastes cunicularius Erichson (Coleoptera: Scolytidae) in transferring uropodine mites in a mountain spruce forest" pptx
... proportion of beetles vectoring deutonymphs of uropodine mites, and on assemblage structure, frequency dis- tribution and placement of uropodids on the bark beetle vector. A total of 3,302 adults of ... presence of fresh wounds on lower parts of trunks, at heights of 1.3–1.6 m, measured from the ground to the lower margin of trap panes. In each sample plot they were posi-...
Ngày tải lên: 07/08/2014, 03:22
Báo cáo lâm nghiệp: "Earthworms (Lumbricidae) of an air-polluted area affected by ameliorative liming" pdf
... eff ects of the storage of soil samples before extraction were proved on the amount of caught juvenile and adult earthworms on the spring and autumn date of sampling at the level of signifi ... high content of phosphorus, and nega- tively to the high level of calcium. D. octaedra responded positively to the higher level of calcium and D. vejdovskyi to the higher content of...
Ngày tải lên: 07/08/2014, 10:21
Báo cáo lâm nghiệp: "Effects of microsite variation on growth and adaptive traits in a beech provenance trial." pps
... – beginning of autumn colouring of individual leaves, 3 – beginning of autumn leaf colouring on a mass scale, 5–10% of leaves coloured, 4– mass autumn leaf colouring, ~ 50% of leaves coloured, ... (m) Fig. 1. Spatial patterns of the assessed envi- ronmental variables over the area of the beech provenance trial Table 1. Analysis of variance (signifi cance of F-tests) of...
Ngày tải lên: 07/08/2014, 10:21
Báo cáo lâm nghiệp: "old hardiness as a factor for assessing the potential distribution of the Japanese pine sawyer Monochamus alternatus (Coleoptera: Cerambycidae) in China" pdf
... distribu- tion of the PWN [16]. Therefore, determination of the northern limit for distribution and forecast of potential dispersal regions of the beetle has important significance in the management of the ... as a factor for potential distribution of Monochamus alternatus, parameters of cold hardiness and acclimation responses of the beetle were examined. Supercooling points (...
Ngày tải lên: 07/08/2014, 16:20
Báo cáo lâm nghiệp: "Infrared images of heat fields around a linear heater in tree trunks: what can be learned about sap flow measuremen" pptx
... same eccentricity of ellipse. Increase of temperature was caused by increase of stem tem- perature. Comparably visible range of iso-temperature profiles (compare upper parts of ellipses) demonstrates ... images of heat field and sap flow 657 Figure 3. ( A) IR-image of the heat field in the stem xylem around a linear heater under zero-flow conditions: M – center of an ellipse, F1, F...
Ngày tải lên: 07/08/2014, 16:20
Báo cáo lâm nghiệp: "Effect of leaf biomass and phenological structure of the canopy on plot growth in a deciduous hardwood forest in northern Japan" pot
... had 85.0% of the leaf biomass of UT, whereas HT had 55.3% of the leaf biomass of UT. This was similar to differences in BA among plots (LT: 88.4% of UT; HT: 59.3% of UT). With the exception of 2 years ... INTRODUCTION Foliar or leaf biomass of a forest stand is the primary deter- minant of stand growth [26, 31, 35] because foliage constitutes the photosynthetic organ of a...
Ngày tải lên: 07/08/2014, 16:20
Báo cáo lâm nghiệp: "Effect of tree species substitution on organic matter biodegradability and mineral nutrient availability in a temperate topsoil" pptx
... highest content of 40.3 mg.kg −1 for spruce soil (p < 0.05). Concerning the net production of ammonium for the 40 days of incubation, soil from native forest released 17.1 mg.kg −1 of NH4-N against 13.4 ... accurately the impact of tree species, further studies are needed in a long-term incubation so as to determine the ex- tent and dynamic of the biodegradation of organic ma...
Ngày tải lên: 07/08/2014, 16:20