Báo cáo lâm nghiệp: " Sampling strategies in forest soils" ppsx

... follow- ing the level line (Sauras et al, 1992). A sys- tematic sampling in the same plots (Arias et al, 1991 ), showed higher variability Note Sampling strategies in forest ... and Krause, 1984). SAMPLING STRATEGIES The objectives of the study are to determine the sampling strategy since the technique used strongly influences the informat...

Ngày tải lên: 08/08/2014, 18:21

... nothing left, they continue browsing on other standing trees. No such negative browsing occurs in forests where juve- nile thinning is carried out in spring or summer. is way of felling timing ... Content of nitrogen substances in spruce and pine bark in the course of 2-year investigation Fig. 2. Content of Ca in pine and spruce bark in the course of 2-year investiga- tion 2...

Ngày tải lên: 07/08/2014, 04:20

... SCI., 53, 2007 (3): 93–100 97 lings from the forest nursery planted in the substrate from the declining forest stand, 6 – spruce seedlings from the nursery planted in the soil substrate from the ... again, primarily in those variants of the pot experi- ment in which we compared yellowing spruce seed- lings planted in the soil with intensive impact of spruce litter and green...

Ngày tải lên: 07/08/2014, 03:22

... SCI., 55, 2009 (7): 339–344 (1967) forest inventory covered an extended area in- cluding the SNP. H (2005) studied the Salonga forest using remote sensing. Within the scope of my Ph.D. thesis ... species disseminated throughout the forest landscape; it does not appear to be the harvesting of fuelwood areas. Management of these forests with the main objective of maintaining the...

Ngày tải lên: 07/08/2014, 03:22

... showed that the in- dices obtained by the process of anaerobic incuba- tion cannot be used to assess mineralizing nitrogen in clearings and arable soils. We also obtained by anaerobic incubation ... formula: ANI = initial initial – min N NN (3) where: N min – quantity of mineralized N without subtraction of the initial content of available mineral N (for the anaerobic incubation o...

Ngày tải lên: 07/08/2014, 10:21

... structure is also in u- enced by the intensity of silvicultural measures, es- pecially in the period of thinnings (it increases at their higher intensity). Currently, the disintegration of old ... admixed dwarf pine and Norway spruce and inter- spersed rowan is quite even-aged even though the reforestation including repeated repair planting lasted for 9 years. Losses of the fi rst refor...

Ngày tải lên: 07/08/2014, 10:21

... dwarf pine stands in ascending order showed high resistance to air pollutants. In spite of the extant and further expected de- crease in SO 2 emissions, the forest decline will con- tinue in the ... Krkonoše Mts. In: Major tasks for seed production and tree breeding for forest management in air-pollution areas. In: Proceedings of the 8 th National Conference held in Špi...

Ngày tải lên: 07/08/2014, 10:21

... samples in the case of Cd and Zn in the whole country. e results of needle analyses conducted in Nor- way spruce stands on old spoil banks in the Black Forest (Schwarzwald) are very interesting in ... results in some other NFR in the country (Table 1). 01 Krušné hory Mts. – since the middle of the nine - teenth century a heavily polluted area, pollutants originating esp. fr...

Ngày tải lên: 07/08/2014, 10:21

... virgin forest. e testing of the in u- ence of the altitude revealed its great in uence in the growth stage. In the optimum and breakdown stages a statistically significant difference in the index ... of the virgin forest is very heterogeneous in this altitudinal zone. e number of the individuals from natural re- generation (individuals of the height below 130 cm) is declining...

Ngày tải lên: 07/08/2014, 10:22

... density in Finland’s forests were the results of forest man- agement that aimed at increasing the potential of sustainable timber harvests by increasing the GS of trees. The striking in- crease in ... Variation in tree growth in Finland: results from the 6th National Forest Inventory, Folia For. 407 (1979) 1–12. [67] Tomppo E., National forest inventory in Finland and its ro...

Ngày tải lên: 07/08/2014, 16:20