Báo cáo lâm nghiệp: "Influence of tree species on gross and net N transformations in forest soils" ppsx

... by 15 NO 3 production from the addition of 15 NH 4 . In the plantations, gross and net mineralization and nitrification from pool dilution were lowest in the spruce stand and highest in the beech and Corsican pine ... balance between gross transformations of organic N into ammonium or nitrate and immobilisation of mineral N by living microorganisms. Net nitr...

Ngày tải lên: 07/08/2014, 16:20

... emission of compounds inhibiting nitrogen mineralization (i.e. 20000-fold less in clear-cut plot than in the forest) . Net nitrification was mainly the highest in soils originat- ing from beech and ... biodegradability and consequently on mineral element and major nutriments release and availability. The results showed that carbon mineralization and nitrogen mineralizati...

Ngày tải lên: 07/08/2014, 16:20

... eff ect of environmental diff erences among trials on pheno- typic variation rather than its decomposing into the eff ects of single environmental factors. In any case, the study demonstrates that ... variation of environment aff ects growth and adaptive traits in a provenance trial, and whether blocking can effi ciently handle this variation. MATERIALS AND METHODS  e study...

Ngày tải lên: 07/08/2014, 10:21

... of thinning methods varies due to different criteria, including the type of thinning, intensity (grade), re- turn interval, and the timing of the first thinning [48]. Two major types of thinning ... used in forest tending are low (from below) and high (from above) thinning. In low thinning, only suppressed trees are removed, whereas high thinning removes dominant and co-domi...

Ngày tải lên: 07/08/2014, 16:20

... related to interannual changes of climatic conditions and/ or of ring translocations inside the tree would proba- bly conceal the effects on the ring mineral content of possible ... Potential in using elemental concentrations in radial increments of old growth eastern redcedar to examine the chemical history of the environment. In: Proc of...

Ngày tải lên: 08/08/2014, 18:21

... consumption. The main purpose was the determination of input power and comparison of revolution frequency on the outlet shaft of a skidder regarding the dimension of the torque depending on variable ... con- centration into lines, skidding to transporting plac- es, its dimensional homogenization, e.g. chipping, grinding, etc. Wood for energy production can come from either wa...

Ngày tải lên: 07/08/2014, 10:21

... Calcare- 36 34 32 30 28 26 24 22 20 18 16 14 12 10 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 3.2 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 Evenness No. of species Shannon-Wiener index 1 2 3 1 2 3 1 2 3 Group Group Group Fig. 3. Number of species, evenness and Shannon-Wiener index (mean, standard error, standard deviation) for ... selection and unrestricted permutation and 999 runs. e Mon...

Ngày tải lên: 07/08/2014, 10:21

... cutting intensity. e ANOVA results document a significant in uence of cutting intensity on the abundance of both one-year-old and older seedlings. e abundance of beech seedlings was initially ... between the number of beech, hornbeam, fir, oak, linden and sycamore seedlings and the number of fructifying trees, stand density, illumination in the growing season – GS (illu...

Ngày tải lên: 07/08/2014, 10:22

... Högberg N. , Dahlberg A., Jonsson L., Nylund J E., Inter- and intraspecific variation in the ITS region of rDNA of ectomycor- rhizal fungi in Fennoscandia as detected by endonuclease analysis, New ... increase N and P concentrations of inocu- lated plants. Also performance and survival of the Pinus pinea seedlings outplanted in formerly arable land, is improved after ino...

Ngày tải lên: 07/08/2014, 16:20

... Howell C., Plantations of Australia – A report from the National Plantation Inventory and the National Farm Forest Inventory, National Forest Inventory, Bureau of Rural Science, Canberra, 2001. [48] ... rotation age for MFA and MOE and at least 80% effective for wood density. 5. Thinning of trials increased ring width and MFA, reduced ring wood density and MOE of remainin...

Ngày tải lên: 07/08/2014, 16:20