Báo cáo lâm nghiệp: "Evaluation of competition and light estimation indices for predicting diameter growth in mature boreal mixed forests" pdf

... CONCLUSIONS In this examination of competition indices for predicting diameter growth in mixed- species forests, we found that the flexible, distance-dependent crowding index was superior to other indices, but ... based indices [6, 7, 27] is also costly to ob- tain in a forest inventory. The similarity amongst the fit of Competition indices in boreal mixed fo...

Ngày tải lên: 07/08/2014, 16:21

... ca 2ha in size). One of the objectives was to investigate the in uence of specifi c sorting in a forest nursery on the growth and stability of out- plantings of Norway spruce mountain populations. ... at increasing light intensity with an Imaging-PAM 2000 device (Heinz Walz GmbH, Eff eltrrich, Germany). Mea- suring light of the intensity 3 µmol·m –2 ·s –1 and sat-...

Ngày tải lên: 07/08/2014, 10:21

... described in rooted cuttings compared to seedlings, e.g. later onset and lower intensity of dormancy and cold hardiness and earlier flushing in spring (F et al. 2000). e evaluation of the ... artificial forest regeneration in extreme mountain conditions and formation of stable forest ecosystems. It is not a classical breeding programme that would allow using sta...

Ngày tải lên: 07/08/2014, 03:22

... bordering the northern part of the Alborz Mountains and ex- tend from Astara in the west of Gilan Province to Giledarreh in the east of Golestan province, and are about 800 km in length and ... export and import of wood and timber market, the trend of timber products in these forestlands has not been so regular during the last 20 years.  e main types of ti...

Ngày tải lên: 07/08/2014, 10:21

... in uencing the landscape structures in the vicinity of the linear construction in the form of a motorway, and especially due to the accompanying structures of linear or polygon character and ... indicators for sustainable land use? A case study in alpine and lowland landscapes of Austria. In: D J.W., B R.G.H. (eds): Key Concepts in Landscape Ecology, Pr...

Ngày tải lên: 07/08/2014, 10:21

... the main reason and in the case of fl oodplain wood- land the grain size of the sediments can also be con- sidered. Also the in uence of diff erent silvicultural treatments of plants in the ... assessment of growth of individual oak prov- enances at the age of 20 years.  erefore it was chosen as the main criterion for our conclusions.  is value decides on stand de...

Ngày tải lên: 07/08/2014, 10:21

... m in the uneven-aged stand and 10 m in the mature even-aged stand. No relationship was found between CDI5 and LM indices in the plantation, as a result of thinning during the last 10 years in ... diameter increment in Scots pine stands [11]. Simple size ratio competition indices, such as that of Hegyi [9], ex- plained over 50% of the variation in radial growth...

Ngày tải lên: 07/08/2014, 16:21

... other hand, the period of the second intervention has significantly corrobo- rated our original hypothesis about the in uence of forest management on the water-regulating function of forest stands. e ... amount of (surface and ground) water significantly in uences, both in a positive and negative way, the processes of biomass production in individual constituents of al...

Ngày tải lên: 07/08/2014, 03:22

... the findings in Poland, next to the outbreak area (G 1997). The incidental infestations on Scots pine were also observed recently in North- ern Poland (Kartuzy Forest District), in the ... occurs on pine in Siberia. Its occurrence on Pinus strobus and Pinus sylvestris was discovered in the eastern part of the Czech Republic and in southern Poland, where the populati...

Ngày tải lên: 07/08/2014, 03:22

... February and March of the year in question. e standard tree-ring chronology shows an obvious decrease in radial increments starting at the beginning of the 1970s and ending at the end of the 1980s. ... analysis of negative pointer years (Table 3). In the following period there is an increase in increments, with slight interruptions in 1996 and 2000. Another decrea...

Ngày tải lên: 07/08/2014, 03:22