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(A) Variation in the ecosystem carbon use efficiency (CUEe) in different ecologically vulnerable areas (EVAs) and (B) vegetation types in China. The different lowercase letters indicate significant differences at the p < 0.05 level for the CUEe among the different EVAs in China, n.s. indicates no significant differences at the p < 0.05 level for the CUEe among the different vegetation types.
