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. 2015 Oct 30;5:15783. doi: 10.1038/srep15783

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Principle component analysis of the composition of chemical functional groups for (a) four species, including Acer saccharum (ACSA), Drypetes glauca (DRGL), Pinus resinosa (PIRE) and Thuja plicata (THPL), at H. J. Andrews Forest (AND) at decomposition year of 0, 5 and 10 and (b) Pinus resinosa (PIRE) and Drypetes glauca (DRGL) at three sites, including Arctic Lakes (ARC), H. J. Andrews Forest (AND) and Harvard Forest (HRF), at decomposition year of 0, 5 and 10.