000029803 001__ 29803
000029803 041__ $$aEnglish
000029803 100__ $$aGaire, N. P.
000029803 245__ $$aTreeline Dynamics with Climate Change at the Central Nepal Himalaya
000029803 269__ $$cJuly 2014
000029803 260__ $$c2014
000029803 520__ $$aTreeline shifting in tandem with climate change has widely been reported from various parts of the world. In Nepal, several impacts of climate change on the physical environment have been observed, but study on the biological impacts is lacking.This dendrochronological study was carried out at the treeline in the high mountain slope of Kalchuman Lake (3750–4003 m a.s.l.) area of Manaslu Conservation Area in the central Nepal Himalaya to explore the impact of climate change on the treeline dynamic. Two belt transect plots (size: 20 m wide, > 250 m long) were laid which included treeline as well as tree species limit. Ecological mapping of all individuals of dominant trees Abies spectabilis and Betula utilis was done and their tree cores were collected. Stand character and age distribution revealed an occurrence of more matured B. utilis (max. age 198 years) compared to A. spectabilis (max. age 160 years) A. spectabilis contained an overwhelmingly high population (89 %) of younger plants (< 50 years) indicating its high recruitment rate. Population age structure along the elevation gradient revealed an upward shifting of A. spectabilis at the rate of 2.61 m year−1 since AD 1850. The upper distribution limit of B. utilis was found to be stagnant in the past few decades. An increment in plant density as well as upward shifting in the studied treeline ecotones was observed.The regeneration of A. spectabilis, on the other hand, was positively correlated with August precipitation and monthly maximum temperature of the month of the current year. The growth and regeneration of A. spectabilis was more sensitive to maximum and minimum temperature rather than average temperature. The growth of the B. utilis was mainly limited by moisture stress during the pre-monsoon season .As these two species presented species-specific responses to climate change with differential pattern in regeneration condition, much wider differences are anticipated in their population status as climate continues to change throughout the century.
000029803 700__ $$aKoirala, M.
000029803 700__ $$aBhuju, D. R.
000029803 700__ $$aBorgaonkar, H. P.
000029803 773__ $$pClimate of the Past
000029803 8564_ $$uhttp://www.clim-past.net/10/1277/2014/cp-10-1277-2014.pdf$$yExternal link (Open access)
000029803 888__ $$ainternal-pdf://Treeline-4044990217/Treeline.pdf
000029803 980__ $$aARTICLE