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Fig. 1 | BMC Biology

Fig. 1

From: Stomatal conductance limited the CO2 response of grassland in the last century

Fig. 1

Relationship between yield and botanical traits and nutrition. Total herbage yield as a function of the percentage of grasses (a), percentage of forbs (b) percentage of legumes (c), nitrogen nutrition index (NNI) (d), phosphorus nutrition index (PNI) (e), and N fertilizer input (f). Values present the 15-year averages (2004–2018) of individual treatments, except for PNI, which was determined for samples collected between 2000 and 2009. The continuous lines and the shaded areas indicate the regression line for the relationship ± CI95%. The PNI linear regression was calculated for values < 1 only, as yields for PNI values > 1 are assumed independent of phosphorus nutrition status

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