Dear Muneer,
Please have a look at this link and PDF attachments.
https://www.trails.com/facts_39349_what-timberline.html
Good luck
http://lib.icimod.org/record/28904/files/10HAR.pdf
http://lib.icimod.org/record/28903/files/9HAR.pdf
https://www.fs.fed.us/rm/pubs_int/int_rp218.pdf
https://www.researchgate.net/publication/264352891_Alpine_Timberline_Research_Gap_in_Himalaya_A_Literature_Review
Go through these files, will help you.
Article Alpine Timberline Research Gap in Himalaya: A Literature Review
I worked on timber line vegetation of Kumaun Himalaya in early 1980s , you can find many simple to very complex suggestions to define timber line vegetation . A simple explanation for timber line - As altitude increases you will find tree and shrub vegetation to certain point at a higher altitude in temperate zone , but suddenly on mountains , one finds a location where all tree and shrub vegetation has just disappeared , only grasses and other herbacious species are remaining . Such grass+herbacious vegetation is often referred as alpine grasslands in temperate zone .In fact , alpine grasslands are covered with snow to the location where last strip of tree /shrub species occurs for relatively longer period in winter +spring .This last woody vegetation strip in temperate mountains are generally known as timberline or snowline.
Plz, see through here too..
http://www.nationalgeographic.org/encyclopedia/timberline/
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