期刊
PLANT CELL AND ENVIRONMENT
卷 31, 期 10, 页码 1377-1387出版社
WILEY
DOI: 10.1111/j.1365-3040.2008.01848.x
关键词
altitudinal limit; carbon limitation; C-balance; C-N ratio; growth limitation; non-structural carbohydrates; starch; sugars
资金
- National Natural Science Foundation of China [30540039, 40771071, 40771074]
- Key Laboratory of Forest Ecology and Environment
- State Forestry Administration, Chinese Academy of Forestry [CAFIFEEPYBB2007001]
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.
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