Home – Home – Jornals – Contemporary Problems of Ecology 2007 number 1

The data on the microelement composition of Siberian larch (Larix sibirica Ledeb.) growing in the Olkhon region

Seeding qualities and content of general and protein nitrogen in the seeds of Siberian spruce (Picea obovata Ledeb.), pine (Pinus sylvestris L.), Siberian larch (Larix sibirica L.) and Gmelin larch (Larix gmelinii Rupr.) from different regions of East Siberia were determined. It was revealed that the seeds of pine contain the highest level of total and protein nitrogen; the same seeds demonstrated the best seeding properties. A high correlation was found between the potential germination of the seeds of conifers under investigation and total nitrogen content in them. It was shown that the seeding qualities of the seeds and their nitrogen content vary depending on the region of seed collecting and exhibit an essential correlation with the mean July temperature in the regions and with the length of vegetative season.

The influence of environmental factors on the annual growth of crown organs (current year shoots and needles) of Scotch pine from Predbaikal forest-steppe zone was studied during 1976

The data on the understory renewal and analysis of height-age structure of maple (Acer platanoides L.) under the conditions of the Bashkir PreUrals (Ufa plateau) are reported on the basis of field research (during the years 1999

The data on the dynamics of diversity parameters for the grass suffruticous synfolium of the bilberry pine forest in the vicinity of the Reft electric power station are reported. Investigation showed that even with weakly expressed negative changes in parameters, as a rule, the dose

The polyvariation reality of response characteristics of balsam poplar (Populus balsamifera L.) on the sharp increase in metal concentration in the environment was established. It was shown that the metals stipulate changes in breath of poplar leaves. Is was shown that under the action of K⁺, Na⁺,

The state of winter dormancy and release for some evergreens, semi- and deciduous woody and shrubby plants growing under the natural and anthropogenic conditions in the Republic of Altay were investigated by means of recording fast and delayed fluorescence of chlorophyll. It was shown that the degree of winter dormancy, the rate of release and stability to thermal stress are the informative indices for early diagnostics of the injury of plants with industry-related emissions and biological indication of the level of environmental pollution in the region. It was noted that the brown colour of the leaves of Daurian rhododendron in winter has the adaptive importance.

Representative regions of cedar plantations were revealed in different height-belt complexes of the Borus ridge (the northern part of the Zapadny Sayan Ridge). Test grounds were settled with sampling the model trees according to the differentiated procedure checked in the Sayan-Shusha reserve. A retrospective analysis of seminiferous characteristics and the growth of female shoots of Siberian cedar was carried out. The dynamics of seminiferity was determined for the cedar forests growing under different ecological conditions. A less expressed amplitude of productivity over years is characteristic of the under-cliff taiga cedar growth. A possible dependence of the next-year productivity on the growth of the shoots of female generative stage was analyzed: a substantial development of the female generative stage is observed during the year preceding a good crop.

The species of epiphytic lichens on bark of Mongolian and dentate oaks in the south of Khasan region (Primorsky Territory) were investigated. The list of lichens includes 67 species, 55 of which are registered on Mongolian oak and 42 occur on dentate oak. On the basis of the distribution of species on lichen plots, the analysis of paired floristic similarity of lichen plots was carried out. Two graphic models which reflect the structure of lichen groups on both species of oaks were constructed.

Microbial communities of the thermal alkaline spring Seya (the Barguzin valley, North Pri-Baikalia) are investigated. Physicohcemical parameters of the medium, species and structural-functional composition of microbial mates are determined. The dependence of production processes and diversity of phototrophic organisms on physicochemical conditions is demonstrated, first of all on temperature and hydrogen sulphide content. Production processes go on most actively at a temperature of 30

Study relating to changes in the physiological state of Duschekia fruticosa (Rupr) Pouzar buds and content of stilbene growth-inhibiting substances (pinosylvin and its monomethyl ether) in the annual cycle of its development was made. It is shown that the processes of day length shortening from early to mid-August and water level decrease in cells cause the state of true dormancy for axillary buds of Duschekia fruticosa growing in Central Yakutia. Pinosylvin and its monomethyl ether are stored in buds in the course of inhibition of growth processes. During true dormancy, the content of pinosylvin monomethyl ether in young bud leaves comes to maximal values (50

Variability of the flavonoid content in 30 individual plants of Artemisia dracunculus L. during 5 years (1998

The high explanatory potential of Brown-Blanke method for the investigation of biological diversity of plants was demonstrated for the forests of two reserves of the Republic of Bashkortostan as examples. The method allows one to establish the types of plant communities of different ranks in the most formalized manner and to estimate on this basis beta diversity of specific territories, as well as absolute and relative synthetic alpha diversity of the communities. It was shown that higher relative synthetic alpha diversity of the communities of forests of Zhulgan-Tash reserve is a reason of higher gamma diversity, in spite of the fact that this reserve possesses smaller area and smaller hyperspace of environmental conditions in comparison with the Bashkyr reserve.

The diversity of life forms of Siberian rowan in the forest and under-cliff belts in the mountains of the Kuznetsky Alatau is investigated. Seven life forms of Siberian rowan were described. It was shown that the character and width of the biomorphological spectrum of the species are determined by the ecological cenotic conditions of the habitat. On the basis of an

For 32 North-Asiatic species of 6 sections of Euphorbia genus, the features of cyathia arrangement in general inflorescence, such as quantity, arrangement and branching of inflorescence axes were studied. The differences between inflorescences of different species were established. The features of the general inflorescence structure were revealed, which have important diagnostic value on different taxonomical levels in the system of genus, such as differentiation of terminal umbel, number of rays of the umbel and axillary rays, number of secondary rays and degree of branching, etc. A key for the diagnostics of the studied species of Euphorbia using inflorescence features was worked out and short characteristics of inflorescences in each species were listed.