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. 2015 Sep 25;5:14454. doi: 10.1038/srep14454

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SD_L, SL_L, SD_C, and SL_C are the stomatal density and length at the species and community levels, respectively. Environmental variables include mean annual temperature (MAT), mean annual precipitation (MAP), and soil N. n, number of observations. Error bars in panels (D) and (E) represent ± 1 standard error.