Báo cáo lâm nghiệp: "Seasonal fluctuation in germination of short and longterm stored Norway spruce" ppsx

... characteristics of GE and GC of analysed samples of short- term stored seed (S) and long-term stored seed (L) in the first year (T1) and the second year of testing (T2) Variant N Germination energy (GE %) Germination ... values of germina- tion energy (GE) and germination capacity (GC) in individual months (M = 1, 2, 3 … 12), in total 10 for short- term (...

Ngày tải lên: 07/08/2014, 10:21

... 5.5, and 4.3 in rainwa- ter, 6.0, 6.6, 6.2, and 4.3 in throughfall and 7.0, 6.9, 6.1, and 4.7 in sub-throughfall in spring, summer, autumn, and winter, respectively. Ion exchange in canopies and ... pH of rainwater in summer (4.3) and winter (4.3) was very low, being a little bit higher in spring (4.7). As said, rain quantity in spring and summer accounted fo...

Ngày tải lên: 07/08/2014, 16:20

... manganese and mainly of aluminium. e low content of potassium also indicates the insufficiency of water regimen both in soil and in individual spruce trees. e generally hypothesised deficiency of ... were planted in the soil from the decomposing stand and compared with both yellowing and green seedlings planted in the soil from the beech stand (Table 8). Phenomen...

Ngày tải lên: 07/08/2014, 03:22

... share of 88.7% in the number of trees and 84.9% in the total stand volumes. Additional tree species include fir (5.7% in the tree count and 9.5% in stand volumes) and sycamore (3.8% and 3.5% ... contribute to the future development of mature beech stands in Bieszczady. Both in undergrowth and in natural seedlings significant increase in the number of beech...

Ngày tải lên: 07/08/2014, 03:22

... standing trees maintain higher relative air hu- midity in the stand, do not hinder the development of newly planted seedlings and their eventual break-up and decomposition aid nutrient cycling. ... of dieback and species spectrum are close to qualitative changes in the phloem and the structure of fauna on standing spruce breaks in stands of the 2 nd and 3 rd age...

Ngày tải lên: 07/08/2014, 03:22

... vary in quality and quantity between seasons and habitats. In years with small or failed seed crops rodent numbers are lowest in spring. en, during summer they increase due to breeding and ... Reproduction ceases in autumn, and high winter mortality leads again to low numbers of rodents in the subsequent spring. Changes in rodent numbers are linked to the bio- mass...

Ngày tải lên: 07/08/2014, 03:22

... ruts, degree of damage to the bearing surface and soil sampling. Before the beginning of investigations the radius of turns, lengths of linear plots, weight and geometrical parameters of a tractor ... number of restrictions on the utilization of certain ways of timber cutting and certain systems of machinery. To work out particular principles in detail and to...

Ngày tải lên: 07/08/2014, 03:22

... beginning of November only in one case in RB and HA localities. Apodemus sylvaticus reproduced until August even in the years of abundance culmination. e gradual decline of the population of ... peaks in the course of monitored years depending on the crop of small-seed species in 2001 and of acorns in 2003 and 2006. e preference of small seeds of tre...

Ngày tải lên: 07/08/2014, 03:22

... silviculture and is often found in multiaged stands of natural origin because of frequent, low-severity fires. A variety of methods were used for controlling stock- ing (see O’H 2002) including initially ... 80.312 70.912 46.638 Stand density index ECC 137.3 115.7 84.5 50.5 388.0 Stand density index BCC 62.3 57.8 38.4 158.5 ECC – end of cutting cycle; BCC – beginning of...

Ngày tải lên: 07/08/2014, 04:20

... N min ‒ quantity of mineralized N without subtraction of the initial content of available mineral N (for the anaerobic incubation of NH 4 + -N content); N initial ‒ initial content of available ... 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 anaerob...

Ngày tải lên: 07/08/2014, 10:21