Production efficiency of loblolly pine and sweetgum in response to four years of intensive management

摘要: We tested the hypothesis that productivity of intensively managed loblolly pine (Pinus taeda L.) and sweetgum (Liquidambar styraciflua stands is dependent not only on leaf area, but also foliar photosynthetic rate. Effects irrigation (irrigation treatment), with a fertilizer solution (fertigation fertigation + pest control (loblolly only; treatment) physiology growth were compared plots during third fourth growing seasons. Complete weed was maintained all plots. Aboveground net primary increased from 16.3 to 40.5 Mg ha(-1) 4.2 23.9 ha(-1), respectively, in response most intensive treatment. Relative treatment, neither nor had significant or consistent influence N concentration, quantum yield, carboxylation efficiency, photosynthesis, stomatal conductance, production efficiency (increment woody biomass per unit area). Irrigation predawn water potential photosynthesis pine, it no effect efficiency. Leaf area predominant determinant maximum these rapidly plantations.