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Gradual expansion of moisture sensitive Abies spectabilis forest in the Trans-Himalayan zone of central Nepal associated with climate change

Citation
Tiwari A, Fan Z, Jump A, Li S & Zhou Z (2017) Gradual expansion of moisture sensitive Abies spectabilis forest in the Trans-Himalayan zone of central Nepal associated with climate change, Dendrochronologia, 41, pp. 34-43.

Abstract
Population structure and tree recruitment dynamics in the natural treeline ecotone of high mountains are strong indicators of vegetation responses to climate. Here, we examined recruitment dynamics ofAbies spectabilisacross the treeline ecotone (3439–3638m asl) of Chimang Lekh of Annapurna Conservation Area in the Trans-Himalayan zone of central Nepal. Dendrochronological techniques were used to establish stand age structure by ring counts of adults, and by terminal bud scar count for seedlings and saplings. The results showed abundant seedling recruitment, higher regenerative inertia and colonization with a consistent range shift of theA. spectabilistreeline. The upward expansion of this sub-alpine treeline was found to be driven by a strong dependence of seedling recruitment and radial growth on snowmelt and precipitation as temperatures rise. The radial growth ofA. spectabilisat the alpine timberline ecotone (ATE) and closed timberline forest (CTF) showed sensitivity to spring season (March–May) climate. Tree ring indices of CTF showed a strong positive correlation with spring and annual precipitation, and a significant negative correlation with spring and annual temperature, however, moisture sensitivity was less strong at ATE than CTF.

Keywords
Trans-Himalaya; Treeline; Recruitment; Ecotone

StatusPublished
AuthorsTiwari Achyut, Fan Ze-Xin, Jump Alistair, Li Shu-Feng, Zhou Zhe-Kun
Publication date01/2017
Publication date online04/02/2016
Date accepted by journal31/01/2016
PublisherElsevier
ISSN 1125-7865
LanguageEnglish

Journal
Dendrochronologia: Volume 41

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