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 Posted: Thu 6:56, 27 Jan 2011 Post subject: moncler outlet Test tending and intermediate fir _ |
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,[link widoczny dla zalogowanych]
Test tending and intermediate fir
Thinning thinning method used in all lower. Third, the results of different thinning intensities and Analysis 1. Growth of the diameter through field investigations, the average diameter at breast height control to 8.03 cm in 2001, 2003, the average diameter at breast height l0.54 cm, regular growth 2.52 m3: moderate thinning in 2001, the average diameter 8. 65 cm, 2003 cm average diameter at breast height l235, regular growth of 3.69 cubic meters; intensity of thinning in 2001, an average of 8.97 cm diameter at breast height, average DBH l2.84 cm in 2003, regular growth 3.78 cubic meters. ● Thinning effects in experimental surgery ● Gui-lan Wang Tie An Hexiang any building can be seen on the results of different thinning intensities in diameter growth after thinning there is a big difference in the amount of both. To the control was lOO% N was 146.8% with moderate to ask cutting, thinning intensity of 150%. Asked after cutting to promote growth in diameter. With the different cutting intensity question time, DBH larger changes year by year, control in 2001, an average increase of 0.84 cm diameter at breast height in 2002, an average increase of 0.69 cm diameter at breast height, diameter at breast height in 2003 the average growth 0. 62 cm,[link widoczny dla zalogowanych], 3-year total increase of 2.15 cm; moderate thinning plot in 2001 an average increase of 0.86 cm diameter at breast height in 2002, an average increase of 1.23 cm diameter at breast height in 2003, an average increase of 1.14 cm diameter at breast height, for a total increase of 3 .23 cm: Thinning plots the average growth in 2001 and 0.85 cm diameter at breast height in 2002, an average increase of 1.18 cm diameter at breast height in 2003, an average increase of 1.29 cm diameter at breast height, total growth of 3.32 cm. More than 1 year after thinning can be seen that moderate thinning effect, the growth of large diameter, to the first 3 years is cutting more than moderate thinning intensity Q, such as the DBH growth were 100%, the moderate thinning DBH was 150.2%, Thinning DBH was 150.4%. 2. On the impact of volume growth per unit area of the mark in 2003; short-tailed bird survey to growing stock growth, the control area 3 plots stumpage was 2.674 m3, 2.89 m3, 3.04 m3, the average 42.9 m3 ha of growing stock; moderate Q plots cutting area 3 accumulation was 3. o4 cubic meters, 4.49 cubic meters, 4.32 cubic meters, an average of 57.74 cubic meters per hectare growing stock; strength Q plots cutting area 3 accumulation was 2.97 m3, 4.07 m3, 4 .26 m, the average accumulation of 3.77 cubic meters per hectare. If the volume control area was 100%, the medium asked Volume Growth cutting area is 137.6%, 131.2% for the intensity of thinning area. 3. The impact on the total stock in 2003 on behalf of Canadian production thinning accumulation control area three plots were 6.67 cubic meters,[link widoczny dla zalogowanych], 6.89 cubic meters, 7. o4 cubic meters, an average of 6.87 cubic meters; moderate thinning area three plots were 9.04 m3,[link widoczny dla zalogowanych], 9.29 m3, 9.52 cubic meters, an average of 9.41 cubic meters; intensity of thinning District 3 plots were 837 cubic meters, 8.95 m3, 9.16 m3, with an average 8.82 m3. These results can be seen that the total output increase after forest thinning, moderate thinning large volume growth, 37.6% large than the control area, the total strength to ask cutting smaller volume growth, 28.5% compared with the control District. IV Summary 1. Fir the thinning time to as Too dry, not very effective in promoting tree growth, too late, although deforestation can increase the number of question, but tree growth adversely. Therefore,[link widoczny dla zalogowanych], tree growth by law, thinning time: status index l4 of 8 years should be carried out in the first thinning, the status index l6 of 6 years should be thinned. 2. Tending to ask cutting intensity is directly related to growth and wood quality of trees. Thinning intensity is too large, the growth of beneficial plant can increase the rate of lumber out of wood, but the decline in stand growth, felling the timber when the volume is not high: strength is too small, would not achieve to promote tree growth. According to the results, generally 25% more appropriate to ask, after cutting, a class of plant stands per hectare reservation 1350-1650, 1800-2100 Type II strains of forest reserves per hectare, so that the felling of timber-producing capacity can be increased. 3. Thinning should be based on the number and spacing of the local labor and traffic conditions, and test area easily accessible, adequate social labor, the 1st time in 8 years of thinning, cutting time for the 2nd question should be asked for 13-15 years This not only promote the fast-growing trees, and can increase the median income, improve the felling of timber wood production. (Of a single living: Zhuzhou County Forestry Bureau)
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