Relationships between Plant Biodiversity and Soil Fertility in a Mature Tropical Forest, Costa Rica

Figure 3

Linear regression relationships between tree species richness and the following soil chemical factors: (a) K content (cmol(+)/kg), (b) Ca content (cmol(+)/kg), (c) P content (mg/kg), (d) cation exchange capacity, and (e) soil fertility index and Shannon-Wiener tree species diversity and (f) C/N ratio (means ± 95% C.I.).

(a)

(b)

(c)

(d)

(e)

(f)