Carbon and Nitrogen Stable Isotope Abundance and Soil Stoichiometry of Zanthoxylum planispinum var. dintanensis Plantations of Different Ages

Understanding the relationships between carbon; nitrogen, their stable isotopes δ13C and δ15N, soil stoichiometry may further our understanding of regulatory mechanisms quality index on equilibrium isotopic fractionation. Four plantations Zanthoxylum planispinum var. dintanensis (5–7, 10–12, 20–22 30–32 years) in karst plateau gorge area, Guizhou Province, China, were selected to determine variation characteristics interactions leaves, leaf litter, carbon (C), nitrogen (N) with plantation age, explore relationship δ15N. The results as follows: (1) −28.04‰ ± 0.59‰, −26.85‰ 0.67‰, −19.39‰ 1.37‰, respectively. contents δ15N 2.01‰ 0.99‰, 2.91‰ 1.32‰, 3.29‰ 0.69‰, ranked order, > litter leaf. (2) With increasing 13C decreased; increased first then decreased, did not vary significantly. (3) layer was positively correlated negatively (4) Redundancy analysis showed that microbial biomass (MBC) bacteria/fungi (BAC/FUN) dominant factors affecting natural abundance C N