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ABSTRACT No single hypothesis or theory has been widely accepted for explaining the functional mechanism of global alpine/arctic treeline formation. The present study tested whether the alpine treeline is determined by (1) the needle nitrogen content associated with photosynthesis (carbon gain); (2) a sufficient source–sink ratio of carbon; or (3) a sufficient C–N ratio. Nitrogen does not limit the growth and development of trees studied at the Himalayan treelines. Levels of non‐structural carbohydrates (NSC) in trees were species‐specific and site‐dependent; therefore, the treeline cases studied did not show consistent evidence of source/carbon limitation or sink/growth limitation in treeline trees. However, results of the combined three treelines showed that the treeline trees may suffer from a winter carbon shortage. The source capacity and the sink capacity of a tree influence its tissue NSC concentrations and the carbon balance; therefore, we suggest that the persistence and development of treeline trees in a harsh alpine environment may require a minimum level of the total NSC concentration, a sufficiently high sugar:starch ratio, and a balanced carbon source–sink relationship.
Plant Cell & Environment – Wiley
Published: Oct 1, 2008
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