The Status and Ecology of a Juniperus excelsa subsp. polycarpos Woodland in the Northern Mountains of Oman

The Status and Ecology of a Juniperus excelsa subsp. polycarpos Woodland in the Northern Mountains of Oman

Juniperus excelsa subsp. polycarpos (K. Koch) Takhtajan is found in mountain areas from Turkey through to India and as an isolated population on Jebel Akhdar in the northern mountains of Oman. Juniperus is one of the dominant plant species in these mountains and a major landscape feature of several...

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Veröffentlicht in:Vegetatio. - DR W. Junk Publishers, 1948. - 119(1995), 1, Seite 33-51
1. Verfasser: Fisher, Martin (VerfasserIn)
Weitere Verfasser: Gardner, Andrew S.
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 1995
Zugriff auf das übergeordnete Werk:Vegetatio
Schlagworte:Arabia Conifer Die-back Juniper Regeneration Spatial distribution Physical sciences Biological sciences Social sciences
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245 1 4 |a The Status and Ecology of a Juniperus excelsa subsp. polycarpos Woodland in the Northern Mountains of Oman 
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520 |a Juniperus excelsa subsp. polycarpos (K. Koch) Takhtajan is found in mountain areas from Turkey through to India and as an isolated population on Jebel Akhdar in the northern mountains of Oman. Juniperus is one of the dominant plant species in these mountains and a major landscape feature of several proposed National Nature and Scenic Reserves and of Hayl Juwari, a wooded valley at 2250 m altitude proposed as a Botanical Site of Special Interest. Above 2400 m altitude the Juniperus woodlands generally appear to be regenerating and in good condition, both on exposed slopes and in wadis and sheltered gullies, whereas below 2400 m most stands are in poor condition and exhibit few signs of regeneration. If the apparently poor condition of the lower altitude woodlands is due to any long term change in climatic conditions, both tree status and regeneration would be poorer in relatively more xeric habitats. To test this prediction we have carried out a detailed survey of the status and ecology of a 32 ha area of Hayl Juwari, and analysed differences in tree status and regeneration between wadis (relatively more mesic sites) and non-wadi areas (relatively more xeric). Approximately one third of the trees are dead, and an analysis of the height, condition, regeneration, female cone production, preferred germination sites and spatial distribution of trees indicates the importance of topography, hydrology and microclimate for growth. However, although there are relatively greater numbers of dead and poor-condition trees in the more xeric non-wadi habitat, there is no unequivocal evidence that the present distribution of small, sexually immature trees in both habitats could not form a pattern of larger, sexually mature trees similar to that seen today. We speculate, however, that the climate at this altitude may be marginal for the survival of a J. excelsa subsp. polycarpos woodland and that even small increases in climatic stress could imperil the woodland's present status. 
540 |a Copyright 1995 Kluwer Academic Publishers 
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650 4 |a Conifer 
650 4 |a Die-back 
650 4 |a Juniper 
650 4 |a Regeneration 
650 4 |a Spatial distribution 
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650 4 |a Biological sciences  |x Ecology  |x Population ecology  |x Synecology  |x Biocenosis  |x Plant communities  |x Woodlands 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Plant ecology  |x Forest ecology  |x Forest ecosystems  |x Forest litter  |x Dead wood 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Plant ecology  |x Forest ecology 
650 4 |a Social sciences  |x Human geography  |x Housing  |x Living arrangements  |x Standard of living  |x Living conditions 
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650 4 |a Biological sciences  |x Biology  |x Botany  |x Forestry  |x Silviculture  |x Silvicultural practices  |x Forest regeneration 
650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Geomorphology  |x Landforms  |x Tectonic landforms  |x Mountains 
655 4 |a research-article 
700 1 |a Gardner, Andrew S.  |e verfasserin  |4 aut 
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