Analysis Of Stand Structure And The Investigation On Aboveground Biomass Of Larix Principis-rupprechtii Mayr

In this paper, the north ditch Weichang County forest area of Larix principis-rupprechtii Mayr plantation as the research object,Analysis and research on forest structure and biomass, the conclusions are as follows:Studyon diameter、height distribution and Simulation of Larix principis-rupprechtii Matr plantations, the results shows that:(1) In diameter, 17 years to 43 years the fitting diameter distribution of larch plantation were in accord with normal distribution, the normal distribution is the best distribution of larch plantation.Along with the age increased, the peak frequency theory of normal distribution gradually decreased, the diameter distribution range increases gradually, the peakto size offset, the diameter of the curve discrete degree increases with age. In the same age of different density stand, with the stand density increasing, the peak diameter distribution curve decrease dgra dually.The diameter distribution curve gradually to the diameter direction(left)offset, the mean DBH decreased gradually. At the same density, with the age increased, the peak diameter distribution curve increases, the diameter distribution curve towards large diameter direction, the mean DBH increased gradually.(2) In the study of high structure distribution in the tree, with the increase of forest age, the average tree height increases in the whole tree,minimum value and maximum value distribution is gradually increased,from 17 to 30 years range increases gradually, gradually decreased in30 to 43 years, the tree height in 25 years to 30 years of rapid growth, 30 years stand in the growth of tree height distribution is discrete. With the increase of forest tree high, average height increases, the approximate linear distribution. average tree height fitting of Quadratic of each diameter of Larixprincipis-rupprechtii Mayr, R2 in 0.9041 ~ 0.9925, the fitting effect is good.Study on the artificial pure forest of Larch plant biomass of different organs and biomass, results show:(1) From the two function model is the most suitable for Larch biomass growth model, the optimal model is: W 干 =2++-312.0648.2067.65 DD 、 W枝=26DHDH)(10868.4024.0701.0-′-+- 、W叶=2210673.6479.0205.2 DD-′+-- 、 W 皮=2282HDHD)(10998.7004.0536.3-′-+- 、W总=2+--558.0486.0846.53 DD(2) Larch forest biomass, organ biomass in 43 years of Larch were the largest, reached 156.01t/ha, 17 ~ 43 years Larch aboveground biomasswere increased by 128.99t/ha, the average annual growth amount is 4.78t/ha A-1, the total growth of stem, branch, leaf, skin quantityis92.78t/ha, 21.43t/ha, 2.93t/ha, 11.85t/ha respectively. Along with the age increased, the biomass of branches, leaves, bark, the growth rate is relatively small, the largest increase in trunk biomass, stem biomass andbiomass and other growth rate gap becomes larger, at a distinct advantage.(3) biomass proportion relationship: The trunk> bark >branch> leaves, The proportion of trunk biomass, increased with stand age increased first and then decreased, at a distinct advantage position; the biomass proportion of branches increased with stand age decreases first and then increases gradually; the proportion of biomass of leaves decreased gradually with the increase of age bark; biomass proportion of the total variation is very small and unstable.