Use of stable isotopes to quantify nitrogen, potassium and magnesium dynamics in young Scots pine (Pinus sylvestris)

摘要: Two-yr-old Scots pine (Pinus sylvestris) seedlings were grown in sand culture for 1 yr with a generous supply of balanced nutrient solution Trees repotted into clean February 1998 and given either reduced or adequate containing enriched 15 N, 41 K 26 Mg to label uptake during spring 1998. doubled their biomass the experiment. Whole-tree net photosynthesis was by 43% after 95 d trees that received lower (P <0.001), although differences between two treatments less pronounced. Remobilization contributed 83, 82 52% Mg, respectively, used support growth new tissues supply. Those receiving higher still obtained 44-59% nutrients from remobilization. Current had no significant effect on amount N remobilized but remobilization = 0.025). The importance young problems associated quantifying internal cycling are discussed.