Báo cáo lâm nghiệp: " aggregation by Tomicus piniperda L (Col: Scolytidae) in Yunnan, southwestern China" pdf

... traps give information influenced by mi- gration of beetles. CONCLUSIONS I. typographus remained dominant species on the majority of sites having high intensity of tree infes- tation mainly along ... understanding of bark beetles spatial distribution. It may be used for practical forest protection only as preliminary information. No environmental factor controlling observed...

Ngày tải lên: 07/08/2014, 03:22

... soils under broadleaved tree species but also to refer to the likely patterns in selected soil properties among different soil units in silver birch (Betula pubescens Ehrh.) stands. In addition ... variation in an evaluation of the nutrient pools of organic layers and the mineral soil in forest stands dominated by silver birch. CONCLUSIONS Referring to properties of s...

Ngày tải lên: 07/08/2014, 03:22

... the current results of the evaluation of the degree of the beech bark necrotic disease in selected localities in Southern Poland. Be- cause of the absence of analogical investigations in Poland, ... 2/7004/27. Current state of beech bark necrotic disease in Southern Poland A. C, I. M Institute of Forest Ecology of the Slovak Academy...

Ngày tải lên: 07/08/2014, 04:20

... in the last decade of April, the snow melting rate in spruce reached about 26 mm/day, in beech about 28 mm/day and in the open area maximally 37 mm/day. All snow melted in spruce and in the ... process of snow precipitation in the spruce and beech stands, snow depth and snow water equivalent were always higher in the leafless br...

Ngày tải lên: 07/08/2014, 04:20

... primary productivity in ter- restrial ecosystems (J et al. 1999), N miner- Moisture effect on carbon and nitrogen mineralization in topsoil of Changbai Mountain, Northeast China G. Q 1,2 , Q. ... is maintained at 20°C. For the given vegetation type of Changbai Mountain, soil C and N mineralization rate, potential mineralizable C (C 0 ) and potential ra...

Ngày tải lên: 07/08/2014, 10:21

... shedding light on the pro- cesses and trends of squared timber and log pro- duction and the relations between them in the Hyr- canian Forests of Iran during the last 20 years. MATERIALS AND METHODS Areas ... 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...

Ngày tải lên: 07/08/2014, 10:21

... of Wooded Agricultural Lands Soil Conditions Towards a Restoration of Forest Soil Conditions. How does legacy of agriculture play role in formation of afforested soil properties? D. K, ... important soil- forming and even soil- creating factor of soil genesis being likely the oldest human-induced alteration of soil proper- ties. Even rather extensi...

Ngày tải lên: 07/08/2014, 10:21

... forest trees in Slovakia. Nauka za Gorata – Forest Science, 43: 29–36. SCHIEBER B., 2006b. Spring phenology of European beech (Fagus sylvatica L.) in submountain beech forest stand with various ... deciduous forest tree species (Carpinus betulus L., Fagus sylvatica L., Quercus dalechampii Ten., Tilia cordata Mill.) was studied in a submountain beech forest...

Ngày tải lên: 07/08/2014, 10:21

... agro-forestry system in changing climate: A case study of the middle Himalayan region of Tehri Garhwal, India C. P. K Ecosystem and Environment Management, Indian Institute of Forest Management, ... climate change; conservation and management; Tehri Garhwal  e majority of indigenous hill agricultural sys- tems in the Garhwal Himalayan region...

Ngày tải lên: 07/08/2014, 10:21

... methods of forest land maintenance in protective zones of high-voltage power lines (HVPL) 400 kV in the protective zone of 70–80 m in width, and 220 kV in the protective zone of 50–60 m in width ... on the number of trees and tree species that would naturally regenerate in zones of HVPL or in open areas outside the forest the resu...

Ngày tải lên: 07/08/2014, 10:21

... biomass functions applicable to oak (Quercus robur, Quer- cus petraea) trees grown in the conditions of Central-European forestry. It is based on destructive measurements of 51 grown trees sampled ... conducted in early spring before bud break. All selected trees were measured both standing and lying on the ground after felling. All basic measurable information was...

Ngày tải lên: 07/08/2014, 10:21

... differences in the selected characteristics of the assimilation apparatus of beech transplants growing in various light conditions of blue spruce small pole stage in the Jizerské hory Mts. in the ... the individual and on Supported by the Ministry of Agriculture of the Czech Republic, Project No. MZe 0002070201. Assimilation apparatus variability of bee...

Ngày tải lên: 07/08/2014, 10:22

... confirmed by the study of N (1961), who stated that the percentage of heartwood in Scots pine decreased with an increase in the length of the live crown and an increase in the widths of the ... the incidence of pipes conductively inactive or periodically inactive. In the dynamic model of crown structure it would be necessary to consider the...

Ngày tải lên: 07/08/2014, 10:22

... article Management criteria for Ficus insipida Willd. (M oraceae) in Amazonian white-water floodplain forests defined by tree-ring analysis Jochen Sch ă ongart a,c * ,FlorianW ittmann a,c , Martin Worbes b , ... gradients in white-water forests across the Amazon Basin, J. Biogeogr. 33 (2006) 1334–1347. [39] Worbes M., Growth rings, increment and age of trees i...

Ngày tải lên: 07/08/2014, 16:21

... bole attacks. It would thus play an essential role in the tree killing process and in the dieback of the forest, possibly explaining the very unusual nocivity of T piniperda ... tronc de tels sujets. Il pourrait donc expliquer le caractère très anormalement nui- sible de Tomicus piniperda en Chine méridionale. Chine / Tomicus piniperda...

Ngày tải lên: 08/08/2014, 18:21