Dulamsuren, Choimaa

[["dc.bibliographiccitation.firstpage","1319"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Biogeosciences"],["dc.bibliographiccitation.lastpage","1333"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Klinge, Michael"],["dc.contributor.author","Dulamsuren, Choimaa"],["dc.contributor.author","Erasmi, Stefan"],["dc.contributor.author","Karger, Dirk Nikolaus"],["dc.contributor.author","Hauck, Markus"],["dc.date.accessioned","2019-07-09T11:45:23Z"],["dc.date.accessioned","2020-05-11T13:15:36Z"],["dc.date.available","2019-07-09T11:45:23Z"],["dc.date.available","2020-05-11T13:15:36Z"],["dc.date.issued","2018"],["dc.description.abstract","In northern Mongolia, at the southern boundary of the Siberian boreal forest belt, the distribution of steppe and forest is generally linked to climate and topography, making this region highly sensitive to climate change and human impact. Detailed investigations on the limiting parameters of forest and steppe in different biomes provide necessary information for paleoenvironmental reconstruction and prognosis of potential landscape change. In this study, remote sensing data and gridded climate data were analyzed in order to identify main distribution patterns of forest and steppe in Mongolia and to detect environmental factors driving forest development. Forest distribution and vegetation vitality derived from the normalized differentiated vegetation index (NDVI) were investigated for the three types of boreal forest present in Mongolia (taiga, subtaiga and forest–steppe), which cover a total area of 73 818 km2. In addition to the forest type areas, the analysis focused on subunits of forest and nonforested areas at the upper and lower treeline, which represent ecological borders between vegetation types. Climate and NDVI data were analyzed for a reference period of 15 years from 1999 to 2013. The presented approach for treeline delineation by identifying representative sites mostly bridges local forest disturbances like fire or tree cutting. Moreover, this procedure provides a valuable tool to distinguish the potential forested area. The upper treeline generally rises from 1800 m above sea level (a.s.l.) in the northeast to 2700 m a.s.l. in the south. The lower treeline locally emerges at 1000 m a.s.l. in the northern taiga and rises southward to 2500 m a.s.l. The latitudinal gradient of both treelines turns into a longitudinal one on the eastern flank of mountain ranges due to higher aridity caused by rain-shadow effects. Less productive trees in terms of NDVI were identified at both the upper and lower treeline in relation to the respective total boreal forest type area. The mean growing season temperature (MGST) of 7.9–8.9 °C and a minimum MGST of 6 °C are limiting parameters at the upper treeline but are negligible for the lower treeline. The minimum of the mean annual precipitation (MAP) of 230–290 mm yr−1 is a limiting parameter at the lower treeline but also at the upper treeline in the forest–steppe ecotone. In general, NDVI and MAP are lower in grassland, and MGST is higher compared to the corresponding boreal forest. One exception occurs at the upper treeline of the subtaiga and taiga, where the alpine vegetation consists of mountain meadow mixed with shrubs. The relation between NDVI and climate data corroborates that more precipitation and higher temperatures generally lead to higher greenness in all ecological subunits. MGST is positively correlated with MAP of the total area of forest–steppe, but this correlation turns negative in the taiga. The limiting factor in the forest–steppe is the relative humidity and in the taiga it is the snow cover distribution. The subtaiga represents an ecological transition zone of approximately 300 mm yr−1 precipitation, which occurs independently from the MGST. Since the treelines are mainly determined by climatic parameters, the rapid climate change in inner Asia will lead to a spatial relocation of tree communities, treelines and boreal forest types. However, a direct deduction of future tree vitality, forest composition and biomass trends from the recent relationships between NDVI and climate parameters is challenging. Besides human impact, it must consider bio- and geoecological issues like, for example, tree rejuvenation, temporal lag of climate adaptation and disappearing permafrost."],["dc.identifier.doi","10.5194/bg-15-1319-2018"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15188"],["dc.identifier.scopus","2-s2.0-85043494931"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59218"],["dc.identifier.url","http://www.scopus.com/inward/record.url?eid=2-s2.0-85043494931&partnerID=MN8TOARS"],["dc.language.iso","en"],["dc.relation.issn","1726-4189"],["dc.subject.ddc","550"],["dc.title","Climate effects on vegetation vitality at the treeline of boreal forests of Mongolia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","55"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Forest Ecosystems"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Klinge, Michael"],["dc.contributor.author","Dulamsuren, Choimaa"],["dc.contributor.author","Schneider, Florian"],["dc.contributor.author","Erasmi, Stefan"],["dc.contributor.author","Bayarsaikhan, Uudus"],["dc.contributor.author","Sauer, Daniela"],["dc.contributor.author","Hauck, Markus"],["dc.date.accessioned","2021-09-01T06:38:24Z"],["dc.date.accessioned","2022-06-29T13:24:59Z"],["dc.date.accessioned","2022-08-18T12:38:34Z"],["dc.date.available","2021-09-01T06:38:24Z"],["dc.date.available","2022-06-29T13:24:59Z"],["dc.date.available","2022-08-18T12:38:34Z"],["dc.date.issued","2021-08-10"],["dc.date.updated","2022-07-29T12:18:50Z"],["dc.description.abstract","Abstract\r\n \r\n Background\r\n Forest distribution in the forest-steppe of Mongolia depends on relief, permafrost, and climate, and is highly sensitive to climate change and anthropogenic disturbance. Forest fires and logging decreased the forest area in the forest-steppe of Mongolia. The intention of this study was to identify the geoecological parameters that control forest distribution and living-tree biomass in this semi-arid environment. Based on these parameters, we aimed to delineate the area that forest might potentially occupy and to analyse the spatial patterns of actual and potential tree biomass.\r\n \r\n \r\n Methods\r\n We used a combination of various geographic methods in conjunction with statistical analyses to identify the key parameters controlling forest distribution. In several field campaigns, we mapped tree biomass and ecological parameters in a study area within the Tarvagatai Nuruu National Park (central Mongolia). Forest areas, topographic parameters and vegetation indices were obtained from remote sensing data. Significant correlations between forest distribution and living-tree biomass on one hand, and topographic parameters, climate data, and environmental conditions on the other hand, were used to delineate the area of potential forest distribution and to estimate total living-tree biomass for this area.\r\n \r\n \r\n Results\r\n Presence of forest on slopes was controlled by the factors elevation, aspect, slope, mean annual precipitation, and mean growing-season temperature. Combining these factors allowed for estimation of potential forest area but was less suitable for tree-biomass delineation. No significant differences in mean living-tree biomass existed between sites exposed to different local conditions with respect to forest fire, exploitation, and soil properties. Tree biomass was reduced at forest edges (defined as 30 m wide belt), in small fragmented and in large forest stands. Tree biomass in the study area was 20 × 109 g (1,086 km2 forest area), whereas the potential tree biomass would reach up to 65 × 109 g (> 3168 km2).\r\n \r\n \r\n Conclusions\r\n The obtained projection suggests that the potential forest area and tree biomass under the present climatic and geoecological conditions is three times that of the present forest area and biomass. Forest fires, which mostly affected large forest stands in the upper mountains, destroyed 43% of the forest area and 45% of the living-tree biomass in the study area over the period 1986–2017."],["dc.identifier.citation","Forest Ecosystems. 2021 Aug 10;8(1):55"],["dc.identifier.doi","10.1186/s40663-021-00333-9"],["dc.identifier.pii","333"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/88925"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/111871"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/112963"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-455"],["dc.publisher","Springer Singapore"],["dc.relation.eissn","2197-5620"],["dc.rights.holder","The Author(s)"],["dc.subject","Biomass"],["dc.subject","Fire"],["dc.subject","Forest-steppe"],["dc.subject","Geoecological factors"],["dc.subject","Mongolia"],["dc.subject","Permafrost"],["dc.title","Geoecological parameters indicate discrepancies between potential and actual forest area in the forest-steppe of Central Mongolia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","139"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Plant Ecology"],["dc.bibliographiccitation.lastpage","152"],["dc.bibliographiccitation.volume","214"],["dc.contributor.author","Dulamsuren, Choimaa"],["dc.contributor.author","Hauck, Markus"],["dc.contributor.author","Leuschner, Christoph"],["dc.date.accessioned","2018-11-07T09:30:43Z"],["dc.date.available","2018-11-07T09:30:43Z"],["dc.date.issued","2013"],["dc.description.abstract","The potential of Scots pine (Pinus sylvestris) for regeneration and encroachment onto dry grasslands in the forest-steppe ecotone was experimentally studied at the south-eastern distribution limit of the species in Mongolia. The experiment consisted of a sowing and planting (2-year old seedlings) assay at two different distances from the forest line and manipulation of the water supply by irrigation in one half of the replicate plots. Seedling emergence was strongly inhibited by post-dispersal seed predation (between 50 and > 90 % of the seeds were apparently consumed) and by drought. Seedling survival was limited by drought and phytopathogenic fungi that infected the needles. Herbivory by insects or rodents, a key factor for seedling mortality in Larix sibirica, the most frequent tree species in Mongolia's forest-steppe ecotone, was of little importance in Scots pine, probably due to the production of efficient allelochemicals. The potential of Scots pine to regenerate in Mongolia's forest-steppe ecotone and to encroach onto the steppe is very limited and mostly restricted to the immediate vicinity of the forest; it might even decrease in future in the face of climate warming. The observed dependence of seedling emergence and survival on soil moisture suggests that regeneration outside the forest may only be successful in exceptionally moist years. Livestock grazing is certainly an additional limiting factor for Scots pine regeneration in Mongolia, but was not relevant in the present study area."],["dc.identifier.doi","10.1007/s11258-012-0152-z"],["dc.identifier.isi","000313413200012"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8871"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31371"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1385-0237"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Seedling emergence and establishment of Pinus sylvestris in the Mongolian forest-steppe ecotone"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1091"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Oecologia"],["dc.bibliographiccitation.lastpage","1102"],["dc.bibliographiccitation.volume","163"],["dc.contributor.author","Dulamsuren, Choimaa"],["dc.contributor.author","Hauck, Markus"],["dc.contributor.author","Khishigjargal, Mookhor"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.contributor.author","Leuschner, Christoph"],["dc.date.accessioned","2018-11-07T08:41:01Z"],["dc.date.available","2018-11-07T08:41:01Z"],["dc.date.issued","2010"],["dc.description.abstract","Central and semiarid north-eastern Asia was subject to twentieth century warming far above the global average. Since forests of this region occur at their drought limit, they are particularly vulnerable to climate change. We studied the regional variations of temperature and precipitation trends and their effects on tree growth and forest regeneration in Mongolia. Tree-ring series from more than 2,300 trees of Siberian larch (Larix sibirica) collected in four regions of Mongolia's forest zone were analyzed and related to available weather data. Climate trends underlie a remarkable regional variation leading to contrasting responses of tree growth in taiga forests even within the same mountain system. Within a distance of a few hundred kilometers (140-490 km), areas with recently reduced growth and regeneration of larch alternated with regions where these parameters remained constant or even increased. Reduced productivity could be correlated with increasing summer temperatures and decreasing precipitation; improved growth conditions were found at increasing precipitation, but constant summer temperatures. An effect of increasing winter temperatures on tree-ring width or forest regeneration was not detectable. Since declines of productivity and regeneration are more widespread in the Mongolian taiga than the opposite trend, a net loss of forests is likely to occur in the future, as strong increases in temperature and regionally differing changes in precipitation are predicted for the twenty-first century."],["dc.identifier.doi","10.1007/s00442-010-1689-y"],["dc.identifier.isi","000280083300025"],["dc.identifier.pmid","20571829"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/4995"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19376"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0029-8549"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Diverging climate trends in Mongolian taiga forests influence growth and regeneration of Larix sibirica"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","275"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Annals of Forest Science"],["dc.bibliographiccitation.lastpage","282"],["dc.bibliographiccitation.volume","68"],["dc.contributor.author","Dulamsuren, Choimaa"],["dc.contributor.author","Hauck, Markus"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.contributor.author","Leuschner, Christoph"],["dc.date.accessioned","2018-11-07T08:58:18Z"],["dc.date.available","2018-11-07T08:58:18Z"],["dc.date.issued","2011"],["dc.description.abstract","Siberian larch (Larix sibirica) has its southern distribution limit in Mongolia in an area of rapidly rising temperatures. Direct effects of climate on tree-ring formation due to drought stress or indirect effects via the control of insect herbivore populations are little studied. The hypotheses were tested that stem increment of Siberian larch is reduced by (1) drought during the growing season and (2) high snow cover, as the latter is thought to protect hibernating herbivores, including gypsy moth (Lymantria dispar). Tree-ring width increases with decreasing summer temperature, increasing precipitation during the growing season and decreasing winter precipitation. The susceptibility of stem wood formation to drought during the growing season suggests that a future climate warming will decrease productivity of Siberian larch, thus affecting its existence within the forest-steppe ecotone of Mongolia. Narrow tree rings in years following winters with low snowfall support the hypothesis that winter precipitation exerts an indirect effect on the growth of Siberian larch by controlling the survival rates of gypsy moth eggs."],["dc.identifier.doi","10.1007/s13595-011-0043-9"],["dc.identifier.isi","000290448000007"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6669"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23610"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1286-4560"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Climate response of tree-ring width in Larix sibirica growing in the drought-stressed forest-steppe ecotone of northern Mongolia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]