Báo cáo lâm nghiệp: " The influence of drought and thinning on leaf area index estimates from canopy transmittance method" pdf

... inoculation of Ips typographus (L., 1758) to spruce trees under various levels of water stress M. T, O. N Faculty of Forestry and Wood Sciences, Czech University of Life Sciences ... Republic ABSTRACT: Manipulated experiments with males of Ips typographus (L., 1758) were conducted in spruce stands in north-western Slovakia. Some...

Ngày tải lên: 07/08/2014, 03:22

... of irradiation on the behaviour and reproduction success of eight toothed bark beetle Ips typographus (Coleoptera: Scolytidae) M. T 1 , J. V 2 1 Faculty of Forestry and Wood Sciences, ... Slovakia ABSTRACT: Irradiation experiments on Ips typographus (L., 1758) with doses of 15 and 30 Gy (cobalt 60) were con- ducted in 2006. e effect...

Ngày tải lên: 07/08/2014, 03:22

... was used in part as liquid with sand (25 cm 3 sand + 20 ml solution), in part reinforced by heating 6g of agar in a 1 l medium. Cultures were incubated for 6 weeks with a daily lighting period ... substances. White silica sand marked PR 21 from the sandpit Provodín near Česká Lípa (http://www.pisky.cz) was used in laboratories of the North-Bohemian Museum in Libere...

Ngày tải lên: 07/08/2014, 03:22

... were observed mainly in regions exposed to the heavy deposition e effect of point application of fertilizers on the soil environment of spread line windrows in the Krušné hory Mts. D. V 1 , ... scarification the top -soil horizons were moved into line windrows, which caused marked degradation of the soil environment. e present revita...

Ngày tải lên: 07/08/2014, 03:22

... of biotic hazard zones in three spruce dominated regions in Slo- vakia; (3) Proposal of zone-specific forest protection mea- sures. Study regions ree regions with different kind of spruce decline ... Descriptive statistics of data on accidental felling of spruce (m 3 of felled volume) used for the proposal of biotic hazard zones in three inves...

Ngày tải lên: 07/08/2014, 03:22

... information on the given problems. Energy requirements were assessed on the basis of measurement and evaluation of electric input e influence of selected factors on energy requirements for plain ... of selected factors of energy require- ments at plain milling of beech wood on cutting input as well as on basic technological parameters v c...

Ngày tải lên: 07/08/2014, 03:22

... test). RESULTS AND DISCUSSION Confirmation of flooding and P. alni infection effects on black alder e analysis of covariance confirmed that the both factors (flooding and P. alni infection) and their ... condition was Table 1. e effect of long-term flooding and Phytophthora alni infection on the development of black alder saplings Treatment per valid N L...

Ngày tải lên: 07/08/2014, 10:21

... reaction Nutrients 0.3 –0.6 –1.0 1.0 Fig. 2. Relation between the proportion of Picea abies and other variables including EIV (CCA with the proportion of Picea abies as the only environmental ... based on comparing the composition of herb species within three groups of relevés. e groups are created with reference to the proportion of Picea abies in tree...

Ngày tải lên: 07/08/2014, 10:21

... insect populations in the context of this exceptional event. Observations of changes in population levels of the main European forest insect pests during and after the drought are presented and ... prolonged drought on bark beetles The success of the establishment of bark beetle populations on their host tree depends, on the level of the...

Ngày tải lên: 07/08/2014, 16:20

... from the similarity of the detected changes with those caused by drought. This part gives an overview of the state of the art in the use of remote sensing for detecting and monitor- ing forest ... are: to briefly review the existing sources of remote sensing data and their potential to detect drought damage; to review the remote sensing applica...

Ngày tải lên: 07/08/2014, 16:20

... 10.1051/forest:2005015 Original article The influence of different overstory removal on planted spruce and several broadleaved tree species: Survival, growth and pine weevil damage during three years Magnus LÖF a *, ... herbivory from Pine weevils on early growth and survival in different tree species. Sec- ondly, to compare the long-...

Ngày tải lên: 08/08/2014, 00:21

... H., Seasonal variations of glutathione reductase and glutathione in leaves and leaf buds of beech trees (Fagus sylvatica L .) , Phyton 32 (199 2) 99–102. [31] Polle A., Rennenberg H., Photooxidative ... 10.1051/forest:2003005 Original article The influence of microclimate and tree age on the defense capacity of European beech (Fagus sylvat...

Ngày tải lên: 08/08/2014, 01:21

... LAI estimates (Bur- ton et al, 1991). Recently, starting from the assumption that the total amount of radiation intercepted by the canopy layer of a stand depends on the ... only the struc- ture and the development of the stand (growth of the understory, natural regener- ation, etc) but also light and rain interception, vertical...

Ngày tải lên: 08/08/2014, 18:21

... signifi- cant effect of acid rain /mist upon cuticle structure and/ or resistance. The lack of The influence of acid mist upon transpiration, shoot water potential and pressure—volume ... expected to influence plant water status. This paper presents some of the results of a detailed study of the influence of acid mis...

Ngày tải lên: 09/08/2014, 04:20

... Central Ltd The influence of genomics and proteomics on the development of potential vaccines against meningococcal infection John E Heckels* † and Jeannette N Williams † R E VIE W *Correspondence: ... that these technologies will continue to inform the field in the identification of proteins associated with the development of immunity and in the el...

Ngày tải lên: 11/08/2014, 12:20