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. 2017 Feb 10;7:42085. doi: 10.1038/srep42085

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Copyright © 2017, The Author(s)

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Warm season net photosynthetic rate per unit leaf mass (A_m; a,b), seasonal decrease in A_m (c,d), and relative (percent) seasonal decrease in A_m (e,f) in relation to leaf mass per area (LMA) and leaf C/N ratio. Points denote means ± SEs. Red points represent cycads in Fairylake Botanical Garden (FBG), while green points cycads in Xishuangbanna Tropical Botanical Garden (XTBG).The black lines are exponential relationships (a,b) fitted to all the points. The green lines are standardized major axis lines (c,d,e,f) fitted to the species in XTBG. *P < 0.05; **P < 0.01. Caution is needed when interpreting the r² value in (a) as A_m is calculated as photosynthetic rate per area (A_a) divided by LMA, which raises the issue of non-independence. Photo credit: Y-J Zhang.