[Dynamic characteristics of nutrient elements in Castanea henryi plantation at beginning of fructification and its...

The dynamic variation of nutrient elements in Castanea henryi plantation was analysed and simulated by means of a system analysis, and the models of four compartments including aboveground, root, soil and litter were constructed. Evaluation on the nutrient pools of N, P, K, Ca and Mg in the four compartments at the beginning of fructification showed that soil compartment had highest content of N, P, K and Ca which was up to 311.47, 11.64, 218.90 and 87.56 kg.hm-2, respectively. The highest Mg occurred in litter compartment, up to 7.563 kg.hm-2. Based on the compartment model, the fluxes and rates of the five nutrient elements between the compartments were calculated, and their changing trends in compartments in 5 years were forecasted. The results showed that the most suitable amount of annually compensating the five elements was 20(N), 8(P), 5(K), 10 (Ca) and 5 (Mg) kg.hm-2, respectively. This nutrient compensation promoted the nutrient flows, and normalised the growth and metabolism of the tree. The research could provide with important basic data for nutrient management of this type of plantation at this stage.