Impact Of Management On Series Silviculture Measure Of Second Generation Of Chinese Fir

We have systematically studied the effects of yield modes, different plough modes, different slash treatments on growth situation ,the soil properties, the decomposition of slash mulching of the second rotation stand of Chinese fir, then show results:1. The treatment of all the biomass harvest from the forest land and the shrubwhich the diameter is more than 2cm,ditch plough and control burning (A1B3C1) is the best way of diameter growth of one year-old Chinese fir. Control burning has significant effects on diameter growth; but for two year-old young Chinese fir, the main factors turn into the treatment of stem harvest, strip plough (2m,1m )and control burning (A3B3C1) is the best. The main factors of diameter growth are decomposition of slash mulching (control burning) and yield mode (only the treatment of stem harvest).2. The yield modes, the slash treatment of the first rotation young stand ofChinese fir and the plough modes of the second rotation stand of Chinese fir have significant effects on the growth of tree height of one year-old and two-year-old of the second rotation young stand of Chinese fir. The treatment of stem harvest, ditch plough and control burning (A3B3C1) is the best way of the growth of tree height of one-year-old Chinese fir.3. The yield mode has significant effect on the biomass of one-year-old Chinesefir, the treatment of the biomass harvest of the forest land and the shrub which the diameter is more than 2cm, ditch plough and control burning (A1B3C1) is the best .The yield modes and the treatment of slash also have effect on the biomass accumulation of two-year-old Chinese fir, the treatment of the stem harvest and strip plough (2m, lm) and control burning (A3B1C1) is the best.4. The treatment of slash and yield have significant effect on soil organic matter,the treatment of branch harvest which diameter is more than 2cm (including arbor and shrub) on the forest land, strip plough (2m, lm) and the stacking of slash mulching and grass and shrub (A2B1C2) can improve the content of soil organic matter.5. The yield modes have significant effects on content of soil total N of thesecond rotation young stand of Chinese fir; the treatment of branches harvest diameter is more than 2cm on the forest land (including arbor and shrub), ditch plough and the stacking of slash mulching and grass and shrub canimprove the content of soil total N of the second rotation young stands of Chinese fir.6. The yield modes have significant effects on the content of soil total P of thesecond rotation young stand of Chinese fir, the treatment of all biomass harvest and shrub which diameter is more than 2cm on the forest land, ditch plough and control burning (A1B3C1) can improve the content of soil total P of the second rotation young stand of Chinese fir.7. The plough modes have significant effects on the content of soil available K ofthe second rotation young stand of Chinese fir, the treatment of branches which diameter is more than 2cm on the forest land (including arbor and shrub), ditch plough and the stacking of slash mulching and grass and shrub (A2B3C2) can improve the content of available K of the second rotation young stand of Chinese fir.8. The yield modes, the treatments of decomposition of slash mulching of thefirst rotation young stand of Chinese fir and the plough modes of the second rotation stand of Chinese fir have significant effects on the change of the surface soil pH of the second rotation young stand of Chinese fir; the treatment only the stems harvest, control burning and ditch plough (A3B3C1) can regulate acidity and alkalinity of soil and suit for the growth of Chinese fir. It has difference between the surface and inner layer soil.9. The change of the decomposition of slash mulching and the content of nutrient.The weight of decomposing slash mulching can lose with time, but loses fast at first and then slows, the release and the remove of elements is complicated in different phase of decomposition of slash mulching because of the...