Abstract
Background and aim Significant differences in tree growth were observed in an exotic pine plantation under different harvest residue management regimes at ages 2–10 years. However, the variations in tree growth between residue management treatments could not be explained by soil and foliar nutrient analyses, except by potassium (K) concentration. Therefore, this study determined the carbon isotope composition (δ13C) and oxygen isotope composition (δ18O) of current and archived foliar samples from the exotic pine plantation to establish relationships with foliar K concentration and tree growth indices as a means to determine changes in stomatal conductance (gs) and photosynthetic rate (Amax) or water use efficiency (WUE), and therefore understand the variations in tree growth across treatments.
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