【摘 要】
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Stomata control carbon and water vapor exchange between the leaves and the atmosphere, thus influencing photosynthesis and transpiration. Combina-tions of fores
【机 构】
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Beijing Key Laboratory of Forest Resources and EcosystemProcesses , Beijing Forestry University , Be
论文部分内容阅读
Stomata control carbon and water vapor exchange between the leaves and the atmosphere, thus influencing photosynthesis and transpiration. Combina-tions of forest patches with different stand ages are com-mon in nature, however, information of which stomatal traits vary among these stands and how, remains limited. Here, seven different aged forest stands (6, 14, 25, 36, 45, 55, and 100 years) were selected in typical temperate, mixed broadleaf-conifer forests of northeast China. Stomatal den-sity, size and relative area of 624 species, including the same species in stands of different ages were selected. Stomatal density, size and relative area were distributed log-normally, differing across all species and plant functional groups. Sto-matal density ranged from 4.2 to 1276.7 stomata mm –2 , sto-matal size ranged from 66.6 to 8315.7 μm 2 , and stomatal relative area 0.1–93.3％. There was a significant negative relationship between density and size at the species and functional group levels, while the relative stomatal area was positively correlated with density and size. Stomatal traits of dominant species were relatively stable across different stand ages but were significantly different for herbs. The results suggest that stomatal traits remain relatively stable for dominant species in natural forests and therefore, spatial variation in stomatal traits across forest patches does not need to be incorporated in future ecological models.
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