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Litter decomposition of typical forests along an altitude gradient in Mt. Shennongjia, Hubei, China. Decomposition dynamics of leaf litter in logging residue of a secondary Castanopsis carlesii plantation and its chemical composition changes. A COMPARISON STUDY BETWEEN MEDICINAL PLANT UNCARIA RHYNCHOPHYLLA(MIQ.) MIQ. EX HAVIL. AND UNCARIA RHYNCHOPHYLLOIDES HOW