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Summary: Air temperature and photoperiod are important factors for the seedling development of tropical forest species. The method used to calculate thermal time significantly influences the analysis of seedling development, with the method comparing three cardinal temperatures with the mean air temperature performing the best. The influence of photoperiod on seedling development is inconclusive, but seedlings tend to develop better under mild temperatures and a photoperiod shorter than 13 hours.
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Elena A. Erofeeva
Summary: Shelford's law of tolerance illustrates the relationship between environmental factors and species or populations through a curve; hormesis concept is increasingly used to study dose-response relationships in organisms; analysis shows that hormetic model and Shelford's tolerance law curve complement each other.
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