| Tests under different condition of site of white birch wildwood in the Northeast Forestry University Mao'ershan forest farm.selects 49 standard places according to the site type, investigated the forest growth target and the site factor, each standard elects to cut down 1 ruling stem to carry on the stem analysis. Using mathematical quantification method study white birch growth and site factor relations. At the same time, through different microsite (cuts down pile, rough terrain, thick lignin remnant body, burning down ashes to the same conventional criterion condition of local growth under to pile and exposed rock piles) on the white birch sapling growth and the environment factor investigation, analyzed the young growth stage white birch to live the microste condition suitably. The findings are as follows: (1) Establishment superiority stem high (H), tree diameter at chest height (DBH) and slope position,aspect of slpoe,gradient of slpoe, between soil A thickness and age (A) regression equation. white birch wildwood height growth regression model:H=33.25161+37.76582δ(1-1)+41.70224δ(1-2)+12.71135δ(1-3)+16.70022δ(2-1)-20.22336δ(2-2)+9.34563δ(3-1)+8.082210δ(3-2)+11.23526δ(3-3)-19.87232δ(4-1)-15.21602δ(4-2)-0.931A (correlation coefficient R=0.9348) white birch wildwood tree diameter at chest height growth regression model:DBH=28.6323-10.46260δ(1-1)+9.36141δ(1-2)+12.7501(1-3)+10.15354δ(2-1)-21.50139δ(2-2)+8.45221δ(3-1)+10.05138δ(3-2)+12.12564δ(3-3)-14.23014δ(4-1)-11.150412δ(4-2)-0.827A(correlation coefficient R=0.9282).the correlation analysis result indicated that affects the main site factor which the white birch wildwood grows is in turn the slope position, aspect of slpoe, soil A thick and gradient of slpoe, slope position for leading factor.(2) White birch sets up the place the tree high theory growth equation is H=18.8377(1-Exp(-0.0717 A))1.6866(correlation coefficient R=0.9082), the definite index age is 20 years.(3) At index age, various slopes position's white birch growth existence difference, height growth quantity order from high to low is in turn slope position 12.01m, uphill position 11.63m, downhill position 10.80m, flat land 9.76m, the meadow and bog 9.48m. Arrives when 50 years live, on the land on slopes forest high growth tends to be consistent, but with on the flat land and the meadow, the bog white birch height growth is away from further enlarges.(4) Acted according to site affects the factor to divide 24 site types. Condition of local growth which grows in the Mao'ershan area being suitable white birch for sunny slope or hermaphrodite slope, soil A thick, slope 6-15°, uphill position. (5) This research along with the slope position's rise, the different microsite type the influence which grew to the white birch sapling has also had the change. By cuts down the pile, the thick lignin remnant body and the burning down ashes piles the constitution the microsite environment to be advantageous in each slope position to the white birch sapling's growth; The indentation terrain and in the slope position is advantageous in the downhill position to the white birch sapling's growth, does not favor the white birch in the uphill position the growth. The raised terrain is advantageous in the downhill position to the white birch sapling's growth, the uphill position does not favor the white birch sapling the growth. The leeward slope existence is also advantageous to the white birch sapling's growth. Microsite has the obvious correcting action to the convention, therefore unifies the various projects' advantageous category together, is more advantageous to white birch's growth.
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