The Effects of 7 Fertilizers on the Growth and Nutrient Concentrations of Fraxinus rhynchophylla, Fraxinus mandshurica, Pinus koraiensis,and Abies holophylla Seedlings

摘要

Fertilization is required to keep the balance of tissue nutrients and to produce high qualify seedlings at the permanent nursery. This study was conducted to verify the optimum fertilization method for Fraxinus rhynchophylla, F. mandshurica, Pinus koraiensis, and Abies holophylla seedlings with vector diagnosis method. Seven treatments include nitrogen (N, 13.8 g-nr2), phosphorus (P, 6.1 g-nT2), potassium (K, 7.5 g-nr2) fertilization and lx (N 6.9-g irf2, P 3.05 g-nr2, K 3.65 g-m 2), 2x (twice of lx), 4x (four times of lx) fertilization and no fertilization. Soil pH decreased as fertilization increased. Nitrogen and NPK fertilization decreased exchangeable Ca2' and Mg2* concentrations. Height and root collar diameter of F. rhynchophylla and F. mandshurica significantly increased with N and NPK fertilization, but those of P. koraiensis and A. holophylla did not. The biomass of F. rhynchophylla and F. mandshurica was about twice higher at NPK fertilization compared to the control. The responses of vector diagnosis were different by tree species and fertilization treatment: F. rhynchophylla was in the status of N "dilution", which means the N concentration decreases with N content. Phosphorus and K were "sufficiency" state with 4x fertilization. F. mandshurica showed "retranslocation" as N content decreased without change of dry weight at N, P, K fertilization, but "dilution" state at NPK fertilization. This result suggested that optimal fertilization was required for F. rhynchophylla and F. mandshurica in seedling production stage, but was not essential for P. koraiensis and A. holophylla.