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Analysis of functional traits of woody plant seedlings in an old-growth tropical lowland rain forest on Hainan Island, China Equilibrium solubility of ginkgo flavonoid components in water and PBS of different pHs with mass fraction weight coefficient method Study on solubility of ginkgolide components with mass fraction weight coefficient method Measurement of mass fraction of Sanjie Zhentong capsules with near infrared reflectance spectroscopy