A Study On Key Techniques In Directive Silviculture Of Quercus Acutissima Energy Forest

The main object of this study was provided evidence for the key techniques in directive silviculture of Quercus acutissima energy forest by fertilization and sprout regeneration experiment. The main results were as follows:Soil hydrolyzable nitrogen, total phosphorus and available phosphorus under different fertilizer levels were significantly different. Nitrogen and phosphorus content of leaves under different fertilizer levels were significantly different. There was positive correlation between content of nitrogen, phosphorus, potassium in leaves and fertilizer levels.Pn, Gs and Tr were significantly different under different fertilizer levels and showed gradually increasing trend when fertilizer levels increased. Pn was significantly different among different months in a year and different times in a day. There was a double peak curve of Pn diurnal variation and had a increased at first and decreased subsequently.Ground diameter was significantly different under different fertilizer levels. Tree height and ground diameter was significantly different among different months and increased with fertilizer levels increasing. Total biomass was significantly different under different fertilizer levels. Total biomass was the largest when fertilizer level at 0.45kg/plant. Sequence of caloric value in different components was leaf>bark>branch>stem>root. So we initially determined that the fertilizer at 0.45kg/plant was the best.The length and base diameter of sprouts showed decreasing tendency when stump height and sprout quantity increased. Biomass of sprouts and leaf increased with sprout quantity increasing. Bioenergy in each stump was the biggest in control (without sprout removing) when stump height was at 5cm. However, bioenergy in each stump was the biggest at the combination of stump height of 100cm and with one sprout in each stump except the CK.The length of sprouts showed decreasing tendency when time of setting sprout delayed. The base diameter of sprouts showed decreasing tendency when sprout quantity increased. Initially determined the time of setplanting sprouts in December and with four sprouts in each stump was the best.