• Journal of Ecology and Environment
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• v.41 no.4
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• pp.120-124
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• 2017

We report the species of medicinal plants collected in Khuvsgul and Khangai Mountain regions of Mongolia. Of the vascular plants that occur in the study region, a total of 280 medicinal plant species belonging to 164 genera from 51 families are reported. Of these, we collected voucher specimen for 123 species between June and August in the years 2015 and 2016. The families Asteraceae (46 species), Fabaceae (37 species), and Ranunculaceae (37 species) were represented most in the study area, while Astragalus (21 species), Taraxacum (20 species), and Potentilla (17 species) were the most common genera found.

• The Korean Journal of Quaternary Research
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• v.18 no.2 s.23
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• pp.107-107
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• 2004

In this paper we have introduced some results of study on stand growth pattern and stand structure of larch forest which are located in selected forest sites of Khangai and Gobi-Altai mountain ranges of Mongolia. Our investigations showed that growth intensity and stand structure in western Mongolia are very specific from the other forest vegetation zones of Mongolia. Studies on the stand structure and growth trend indicate that tree types of stand structure and different types of growth of Larix sibrica are very common in Western Mongolia. These peculiarities of stand structure and growth of larch stands in Western Monolia could be used for inventory work and an improvement of the forest management in Western Mongolian region. The larch tree is the dominant tree species in Western Mogolia. Forest cover of the region is about 15%, which is two times higher than the country's average. In this region forest area is divided into 4 forest sub-regions: the Central Khangai, Western Khangai, North Eastern Khangai and South Easterun Khangai sub-regions including taiga, pseudo taiga, sub taiga, sub-alpine and forest steppe belts. Silviculture practices and forest research management request to study forest growth trends in local and general conditions, which means to indicate a change of taxonomic characteristics of stand from time to time including diameter, height, basal area, growth stock etc. The forest management practice mostly uses tables of forest growth and yield based on the results of long term research on forest growth. Forest yield tables and other relevant forest standards of Russia are used for the forest inventory and forest management. They are not able to determine forest structure and growth peculiatities of Mongolian forests. Studies on forest resource assessment in Mongolia indicate that after logging operations and forest fires the natural regeneration of desired species such as pine and larch often does not succeed. This situation forces to take a different approach of forest management and silviculture practice depending on the stand structure and growth rate of the forest stands. According to our investigation in last years, forest growth pattern of larch forest depends mostly on stand structure, stand age and growth condition including forest soil, climate and location in different slopes. Due to improve environmental function of forest ecosystem in the region, it is needed to conduct very comprehensive study of high mountain forest ecosystem in selected sub-regions.

• Economic and Environmental Geology
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• v.46 no.5
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• pp.455-468
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• 2013

We performed reconnaissance survey on Dashinchilen Nb-Ta REE area and Sant Cu area which are located in southeastern part of Khangai rare metals mineralized belt. In Dashinchilen area, Nb and Ta have been found in pegmatitic granite that is largely distributed in the survey area and muscovite in pegmatite which is an intrusion in paleozoic sedimentary rocks which are mostly composed of sandstone. While grades of Nb and Ta are not high, an outcrop that has high Th and U contents (542 ppm of Th and 56.9 ppm of U) has been found. Average and maximum REE contents in the survey area is three times and seven times, respectively, larger than average REE contents in the crust of the Earth. In Sant area, copper oxides such as malachite has been found in quartzite in paleozoic sedimentary rocks. A sedimentary rock formation that has high grade of Mn (12.4-34.6 %) has been found in the survey area. This sedimentary rock formation is the same formation with that of Ugii Nuur Fe-Mn mineralization which is located about 200 km northwest of the survey area. Average and maximum REE contents in the survey area is two and half times and seven times, respectively, larger than average REE contents in the crust of the Earth. According to the factor analysis for the data of the geochemical analysis, Nb and Ta in Dashinchilen area are highly correlated with muscovite and Cu in Sant area is highly correlated with Mo, Sn, and Bi. Furthermore, the factor analysis results show that Fe in Sant area was deposited with rare earth elements.

• The Korean Journal of Quaternary Research
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• v.17 no.2
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• pp.75-78
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• 2003

This study is conducted to examine the solar radiation features of landscape in Eastern Mongolia and their space and time distribution characteristics. To many foreigners, the name Mongolia conjures up images of the vast steppes of Central Asia. And, indeed, the extensive grasslands of the steppe make up the heart of Mongolia-geographically and economically. Steppe covers nearly the entire far eastern part of Mongolia, extending west in a narrowing band just south of the Khangai and Khan Khokhii mountains all the way to the Depression of the Great lakes. Eastern Mongolia is recognized as one of the last remaining untouched grassland steppes in the world. Landscape of Eastern Mongolia divided by 19 types that belongs to High Mountain, Middle Mountain and low mountain steppe. Only 5.6% of the total land area is covered by forest. Eastern Mongolian steppe is homeland of migratory rare and endangered birds and about 2.0million freely migrating gazelles. According to Mongolian scientists, there is growing evidence of fundamental changes in the Eastern steppe ecosystems in terms of increasing aridity during the last 70 years. As estimated average annual temperature has increased by approximately 0.7oC, soil moisture, energy supply has been changing. These processes closely interrelated into water and energy cycle of steppe ecosystem.

• Mineral and Industry
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• v.26
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• pp.22-31
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• 2013

KIGAM and MRAM (Mineral Resources Authority of Mongolia) performed joint researches on geological survey of Dulaankhaikhan W-Mo occurrences areas in southeastern part of Khangai region. XRD results of tungsten containing quartz vein sample show that tungsten minerals are wolframite, hubnerite and ferberiteore. $WO_3$ grade of samples obtained in Silurian Khotont formation is 0.11-4.43% and that of samples obtained in Permian Delgerkhan complex is 137-3844 ppm. Average total $R_2O_3$ of samples obtained in survey area is 473 ppm which is 2.5 times larger than that of Earth's crust. The highest total $R_2O_3$ is 1326 ppm. Factor analysis results show that two areas of high tungsten contents have similar correlations with tungsten, and therefore we conclude that these two areas have the similar origin of mineralization.

• Journal of Ecology and Environment
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• v.39 no.1
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• pp.91-97
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• 2016

This paper reports the species of macromycetes collected in Mongolia: all the species are new to the area. Brief notes on taxonomy, ecology and distribution of the species are added. A total of 30 species of macromycetes were registered, 1 belonging to the division Ascomycota and 29 to the division Basidiomycota. It has been registered that 30 species belong to 25 genera, 17 families and occur in the flora fungus of Mongolia, until now. Specimen for 150 of samples macromycetes collected from June to August, 2015 in Tuv, Arkhangai and Huvsgul were enveloped. Macromycetes have been occured in 9 of 16 geographic regions. According to our studies 2 species in Khubsgul region, 2 species in Khangai region, 3 species in Khingan, 3 species in Dornod Mongol, 1 species in Khentei regions newly registered respectively. As a result of this work, determined 7 species (23%) of macromycetes in forest steppe and steppe regions and 23 species (77%) of them in forest region. The trophic structure for the fungal species is as follows: 2 species lignophite (7%), 4 species moss saprophyte (13%), 5 species soil saprophyte (17%), 15 species mycorrhiz (50%) of all species were respectively.