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西藏林区位于我国的西南部,其地理位置大致居于北纬27°—32°,东经92°—99°之间。北起念青唐古拉山脉南坡,东濒金沙江与川西林区相望,南与滇北林区以及缅甸、印度接壤,西以年降雨量400毫米等值线为界(包括西藏高原的东南部喜马拉雅山东段南侧、雅鲁藏布江中下游,横断山脉(三江流域)中段的高山峡谷林区,以及喜马拉雅南侧西端的几个断续的谷地林区)。全区森林面积为632万公顷,森林蓄积量达14.36亿立方米,森林绵亘起伏,茂密多姿,无论在地貌类型、生态类型、生物种群、森林类型和生长分布等方面均独特而优异,丰富而有规律,诚属珍贵而完好的天然林宝库。本文试就西藏森林的特异性、规律性及其生态成因作一初步探讨。
The forest region of Tibet is located in the southwestern part of our country and its geographical location generally lies between latitude 27 ° -32 ° north latitude and 92 ° -99 ° east longitude. North of the Nyainqentanglha Mountain, on the south slope, facing the Jinsha River to the west of Sichuan Province on the east, bordering on the forests of north Yunnan and Burma to India and on the west to the contour of annual rainfall of 400 mm (including the southeastern part of the Tibet Plateau The middle reaches of the eastern Himalayas, the middle and lower reaches of the Yarlung Zangbo River, the middle reaches of the Hengduan Mountains (Sanjiang River), and several intermittent valleys at the western end of the south Himalayas. The area covers an area of 6,320,000 hectares and the volume of forest reaches 1,436,000,000 cubic meters. The forest is full of ups and downs and is rich in diversity. It is unique and outstanding in terms of landform types, ecological types, biological populations, forest types and growth distribution And regular, sincerity is precious and intact natural forest treasure house. This paper tries to make a preliminary study on the specificity, regularity and ecological causes of the forest in Tibet.