Trees in the desert: Reproduction and genetic structure of fragmented Ulmus pumila forests in Mongolian drylands

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The potential natural distribution of deciduous forests in Central Asia is the subject of ongoing discussions. Ulmus pumila (Siberian elm) is the only tree species occurring in southern and south-eastern Mongolia. In the semi-arid Mongolian Gobi, the species is restricted to ravines and beds of semi-temporary rivers. Compared to zonal occurrences in moister northern Mongolia, elm trees in the Gobi were found to be larger, in spite of their slower growth. Recruitment was very rare in the field although germination studies revealed that seeds were viable, survived osmotic stress, and were tolerant of repeated cycles of moistening and drying. Thus, they should be capable of germination in episodically flooded river beds. Fingerprinting revealed that clonal growth is of negligible importance in the Gobi as almost all U. pumila individuals studied constituted separate genets. Given that many trees were <100 years old and must have become established under current climatic conditions, we infer that the current lack of recruitment is likely to be caused by grazing impact. Our data imply that Ulmus pumila could potentially be much more common in the drylands of southern Mongolia and northern China.

Original languageEnglish
JournalFlora
Volume206
Issue number2
Pages (from-to)91-99
Number of pages9
ISSN0367-2530
DOIs
Publication statusPublished - 02.2011

    Research areas

  • Biology - Clonality, Distribution map, Genetic structure, Germination, Gobi desert, deciduous forest, desert, DNA fingerprinting, flooding, genetic structure, germination, grazing, habitat fragmentation, recruitment (population dynamics), reproductive biology, riparian forest, semiarid region, Gobi Desert, Mongolia, Ulmus, Ulmus pumila

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