Báo cáo lâm nghiệp: "Observations on Armillaria occurrence in declining oak woods of southern Italy" pdf

... Q frainetto, the latter resulting to be the most heavily declining species (Sicoli et al, 1993). Original article Observations on Armillaria occurrence in declining oak woods of ... pre- dominates on declining oaks in southern Italy, further surveys were carried out in numerous oak woods and additional Armillaria isolates were collec...

Ngày tải lên: 08/08/2014, 18:21

... years. In the society it generates employment among the populations of marginal areas along the Mediterranean basin, contributing to the main- tenance and the enrichment of the rural populations. In ... empreintes génétiques / marqueurs PCR 1. INTRODUCTION Cork oak (Quercus suber L.) is one of the most impor- tant forest species growing in semi-arid regions of southern Europ...

Ngày tải lên: 07/08/2014, 16:21

... slits on the cell inner walls prevent root spi- ralling, and holes in the base facilitate drainage and encourage air pruning of roots. Continual air pruning induces a limita- tion to the main root ... root growth by shortening its length to the depth of the container and preventing the development of re- placement taproots. The confining of lateral roots in the con- tainer and th...

Ngày tải lên: 08/08/2014, 00:22

... presence of more rows of ves- sels forming the porous ring and on the pres- ence of intermediate size elements forming transition wood. DISCUSSION Response function analysis ... and verification (Blasing et al, 1981) and in calculating the response function. Monthly precipitation data was combined with monthly maximum tempera- ture and monthly m...

Ngày tải lên: 08/08/2014, 18:21

... Regeneration on only one subplot was sufficient enough for classifying into plots with regeneration. In total, regeneration was indicated on 70.1% of the investigated subplots. e highest share of ... Reduction of regen- eration during repeated measurement Non-forest No change in presence of regeneration Presence of regeneration only by 1 st measurement Presence of reg...

Ngày tải lên: 07/08/2014, 03:22

... surroundings of a cutting edge, – forces necessary for deflection of chips and sup - pression of chip friction against the leading edge of the tooth, – forces necessary for suppression of friction on ... blunt cutting edge does not cut the material in the process of chip cutting. It is mainly in the plain passing the lowest point of the cutting edge but it is also in t...

Ngày tải lên: 07/08/2014, 03:22

... in initial soils in spoil banks following the mining of lignite may be con- nected with the participation of carbon of geological origin. Based on studies in a spoil bank in Piaseczno, W ... distribution. According to studies in Spain it was reported that the organic carbon content in upper horizons of initial soils was 3.0% already in the 5 th year from t...

Ngày tải lên: 07/08/2014, 10:22

... valuable in general. Moreover, industrial operations using heat treatment such as steaming or hot drying are known to change beech colour by inducing a more or less pronounced reddening and darkening. ... boards are of different type. Figure 4 shows the relation between the colour of PW and corresponding RH or NRH, depending on the case; each point is obtained by averaging the 5 selec...

Ngày tải lên: 08/08/2014, 00:22

... nondestructive. But hydraulic detection gives more information on the cumulative impact of cavitation to the water relations of plants. Hydraulic detection involves measuring hydraulic ... could not influ- ence the amount of air coming out of solu- tion upon freezing, the same amount of air will come out regardless of the initial con- dition...

Ngày tải lên: 08/08/2014, 18:21

... decline’ and the influences of decline on genetic structure of stands in the next generation. Preconditions for that are investigations con- cerning the state of damage of oak trees and ... the level of individuals, among individuals in populations and among populations in the natural range of species in order to adapt to heterogeneous...

Ngày tải lên: 08/08/2014, 18:21