highly significantp < 0.01
Effects of Water Regime and Fertilization on Photosynthetic Parameters of Pinus koraiensis and Fraxinus mandshurica Seedlings Water regime had highly significant effects on all photosynthetic parameters in both P. koraiensis and F. mandshurica seedlings ( p < 0.01), confirming that water availability was the dominant factor controlling photosynthetic performance ( Figure 1 ).