Báo cáo lâm nghiệp: "Experimental study of pine ectomycorrhizae: ectomycorrhizal organization after girdling of the hypocoty" potx

... McGraw-Hill, London, pp. 383-417 7 Experimental study of pine ectomycorrhizae: ectomycorrhizal organization after girdling of the hypocotyl J. Lei J. Dexheimer Laboratoire de Biologie ... leading morphologically in the pine to the swelling of the stem above the ablation (Fig. 1 ) and in the fungal partner to the more or less complete...

Ngày tải lên: 09/08/2014, 04:20

... factor of age, the fi nal numbers of cells of par- ticular tissues (EP, AP, LP) did not diff er consider- ably, however, there were diff erences of weeks in the timing of the formation of the tissues. ... conclude, the number of cells is not the only important aspect for the description of the phloem cell formation.  e timing of their formation, it means t...

Ngày tải lên: 07/08/2014, 10:21

... to the forest showed that the best initial tool for the response evaluation was the significance analyses of the changes in the nutrient composition in the soil and nee- dles. e comparison of ... pool in the soil. en, about 27–34% of N could be taken up for the growth of the current year needles and only 2–3% of the total amount in the soil goes to ste...

Ngày tải lên: 07/08/2014, 03:22

... their effect on the weathering of minerals has not yet been studied to any great extent. A lysimeter experiment was performed in a greenhouse to study the influence of Laccaria ... 1989). They were inoculated or not with the ectomycorrhizal fungus, L. laccata. Phlogo- pite particles, mixed with the sand, were the only source of Mg, F...

Ngày tải lên: 09/08/2014, 04:20

... parts of the trunk and transported to the Agriculture University of Cracow. The sections were cut from the trunk at a distance between 2 and 8 m from the base of the trees. In the laboratory the ... vir- ulent than the other fungi evaluated in this study. These fungi were capable of killing whole plant and penetrated deeper into the sapwood than other species. Th...

Ngày tải lên: 07/08/2014, 16:20

... assessing the complexity of field situations, they al- low gaining insight into the capability of harvest residues to decrease N leaching. The amount of N leached from the soil in the absence of harvest ... ac- cording to the occurrence of rainfall. At the end of the experimental period (May 2003) the lysimeters were destructively sampled and the potential miner...

Ngày tải lên: 07/08/2014, 16:21

... spatial distribution of mature trees (circles) and offspring (crosses) within the plot. Four main groups of offspring are shown (A to D). The shadowed area represents the range of the species. Genetic ... 43]. Considering the number of offspring that cannot be generated by the adult trees within the stand and assuming that when offspring matched only one adult in the s...

Ngày tải lên: 08/08/2014, 01:21

... of the natural regeneration of Scots pine (Pinus sylvestris L.) in the High Ebro Basin (Northern Spain), Ann. For. Sci. 58 (2001) 277–288. [21] Grashof-Bokdam C.J., Geertsema M., The effect of ... Aerial photographs of the study area in 1947, 1963 and 1999. White squares indicate the approximate location of the 44 sample plots. Table I. Main stand characteristics of...

Ngày tải lên: 08/08/2014, 01:21

... physio- logical age and/or linked to the relation of the bud to the other growth centers of the plant. An anatomical description of the bud with regard to its organogenetic ... 4). The type of development of the axillary buds depended upon their position on the shoot (Table II). The buds located at the base of the ramification...

Ngày tải lên: 09/08/2014, 04:20

... for the forthcoming studies at the peak of the mountain. e summit of the mountain takes up an approximately 4,000 ha area representing our study site, where the main tree species is black pine ... addition, the study material and some specific properties of the study site are given in Table 2. Sampling and analysis e lower elevations of Kaz Mt. were presen...

Ngày tải lên: 07/08/2014, 03:22