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Relationships between daily photosynthetic photon flux density (PPFD; mol m–2 day–1) and daily accumulated sap flux density (g cm–2 day–1) for four age categories (A0, A1, A2, and A3) of Moso bamboo over five spring phenological stages (incubation, culm-elongation, branch-development, leafing, established stages of newly sprouted culm).
