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On the mountains in humid East and South Asia, arboreal life-forms at the forest limit depend on their latitude relative to c. 20 o N: to the north there are mostly evergreen needle-leaved trees with some deciduous broad-leaved trees, while to the south, evergreen broad-leaved trees prevail. These contrasting patterns relate to temperature conditions both at the forest limit and at the upper limit of evergreen broad-leaved forests. (...)
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Masahiko Ohsawa (1990) studied this question.
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