Figure 5.

Final plant N mass (A and B), final plant [N] (C and D), and final plant δ¹⁵N (E and F) of seedlings of two tropical tree species grown at either ambient (40 Pa) or elevated (70 Pa) CO₂ partial pressure and in four soil treatments. Soil treatments were as follows: high water supply, fertilizer addition (+W+N); high water supply, no fertilizer addition (+W−N); low water supply, fertilizer addition (−W+N); and low water supply, no fertilizer addition (−W−N). O. macrocalyx is a legume and S. macrophylla is a nonlegume. Each bar represents an average of five plants. Error bars represent se.