Soil Carbon, Nitrogen and Phosphorus Fractions and Response to Microorganisms and Mineral Elements in Zanthoxylum planispinum ‘Dintanensis’ Plantations at Different Altitudes

The Carbon (C), nitrogen (N) and phosphorus (P) fractions, mineral element concentrations, microbial density, biomass in 0–10 10–20 cm soil fractions under Zanthoxylum planispinum ‘dintanensis’ plantations, were measured at altitudes of 531, 640, 780, 871, 1097 m the mountainous karst areas Guizhou Province, Southwest China, correlations between altitude variables analyzed. results showed that: (1) with increase altitude, there was no significant linear change C total N, effective microorganism or concentration each layer; however, ammonium-N nitrate-N concentrations gradually decreased, P fraction higher highest altitude; (2) C, microorganisms elements same a surface aggregation effect; (3) principal component analysis identified main indicators affecting N as calcium, iron, zinc, bacteria; (4) correlation that both positively correlated more closely (especially) than abundance. Overall, effect on soluble organic carbon stronger particulate easily oxidized carbon, inorganic closer P. In conclusion, it shows research focusing conservation, nutrient stoichiometry balance, application mineral-rich fertilizers is important for plantation maintenance.