Báo cáo lâm nghiệp: "Soil compaction caused by 450C Timber Jack wheeled skidder (Shefarood forest, northern Iran)" doc

... and water and air infiltration (D et al. 1993). Soil compaction caused by 450C Timber Jack wheeled skidder (Shefarood forest, northern Iran) R. N 1 , I. B 1 , M. A 2 , A. ... done by a ground-based skidding system. e skidder type used in this study was 450C Timber Jack cable skidder, model 6BTA5.9 with 177 hp and 10,257 kg weight. In...

Ngày tải lên: 07/08/2014, 03:22

... application to assess the effects of timber harvest at Wiangaree State Forest, New South Wales, J. Environ. Manage. 11 (1980) 243–265. [40] Sist P., Why RIL won’t work by minimum-diameter cutting alone, Trop. ... created by single-tree selection cutting practices (500–600 m 2 ) to estab- lish and maintain good growth, especially those of commercial value [24, 41, 46, 50]. High extrac...

Ngày tải lên: 08/08/2014, 01:21

... were found. e level of both CEC and BS were also found by G et al. (2000). Upper B horizons ese horizons were characterized by low values of CEC and BS, less acid with equally lower ... horizons were characterized by low CEC and BS values, and less acidity than other horizons with equally low exchangeable acidities, and (iv) C horizons were characterized by relatively...

Ngày tải lên: 07/08/2014, 03:22

... nutrients was also confi rmed by the calcu- lated statistically signifi cant correlation between the foliar content of N and P and the degree of damage to underplantings caused by nutrient defi ciency. ... Karst.) underplantings that were ac- companied by the overall diminished vitality of af- fected trees. Stand nutrition disorders are manifested there by homogeneous yellowing of...

Ngày tải lên: 07/08/2014, 10:21

... FOR. SCI., 54, 2008 (12): 554–565 565 Předmětem studie bylo celkem 20 míst, která byla opuštěna před 5, 17, 20 a 25 lety. Tyto lokality byly zařazeny do dvou kategorií: rekultivované a nerekultivované. ... expressed by the Shannon ('H') diversity index rose with the time gradient from approximately 1.0 to 1.4–1.6 (Table 4). In post-mining areas, community diversity expressed...

Ngày tải lên: 07/08/2014, 10:22

... výšce 420–440 m. Byly odebírány vzorky horizontů humusových forem (L, F, H, Ah) v počtu opakování 4, holorganické horizonty kvantitativně. U všech vzorků byly stanoveny základní pedochemické charakteristiky: ... evaluation was performed using the statistical software S-PLUS by the analysis of vari- ance. e results were evaluated by Scheffe’s method by multiple comparisons at the 95%...

Ngày tải lên: 07/08/2014, 10:22

... The annual fluxes of DOC were estimated using a mean value per stand computed by averaging the data obtained at the three temperatures (4, 10 and 18 ◦ C) since the influence of temperature on DOC production could ... of 70, 74 and 84% of the annual carbon input by litterfall were released annually by heterotrophic respiration and that 8, 9 and 8% were leached as DOC in the oak, mixe...

Ngày tải lên: 07/08/2014, 16:20

... the sample ordination on gradient by averaging, C k ( j)the species ordination on gradient by weighted averaging. It assesses the degree of community organization by measuring species dispersion along ... dominated by epigeous taxa (many species of woodlice and millipedes) while old stands host numerous populations of earthworms. In the beech integral biological reserve of Article pub...

Ngày tải lên: 07/08/2014, 16:20

... moth, Outlook on Agriculture 12 (1983) 34–39. [9] Cadehia D., Insuan A., Estimation of the injury caused by Thaume- topoea pityocampa in Pinus radiata plantation, Bol. Serv. Plagas For. 13 (1970) 159–171. [10] ... 131 (1999) 455–463. [22] Markalas S., Observations on the biology, the behavior and the damage caused by the pine processionary moth (Thaumetopoea pityocampa Schiff.), Arist...

Ngày tải lên: 08/08/2014, 00:21

... dis- tinctly lower than in the healthy stand. In the Hakel Forest, considerable insect defo- liation caused by Tortrix viridana L occurred in May 1993. At the first date ... pressure in the leaves of dam- aged oaks were caused by the reduction in water content of the leaves and not actively by osmotic adjustment. However, osmotic adjustm...

Ngày tải lên: 08/08/2014, 18:21