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Northwest Guizhou light Betula secondary forest growth and operating

Author: WangJie
Tutor: WenZuoWu;ChenXun
School: Guizhou University
Course: Agricultural Extension
Keywords: Betula luminifera Winkler secondary forest community style distribution pattern growth status foster thinning management technical measures
CLC: S792.159
Type: Master's thesis
Year: 2008
Downloads: 14
Quote: 0
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Abstract


Betula luminifera Winkler is special material tree in our country. It formed secondary forest in Guizhou Province mostly,and distribute in the northwest of Guizhou.Betula luminifera H Winkl secondary forest is the important part of Guizhou forest,and has notability function to improve mountain area environment in Guizhou.In order to improve the zoology,economy and society benefit of Betula luminifera H Winkl,explore the manage technology,the paper investigated community style,species distribution,component biology estimate,forest development status, forest foster strike,management technology measure and etc,with the associative methods of management experience summarize,temporary sample plot and fastness sample plot orientation observation.The main investigation result is in the following.In the Betula luminifera H Winkl secondary forest of northwestern Guizhou there are 4 sub formation and 9 association group.They are Betula luminifera H Winkl pure crop,Betula luminifera H Winkl and Chinese aspen bark of leaf mixed forest,Betula luminifera H Winkl and fir mixed forest, Betula luminifera H Winkl and Chinese red pine mixed forest.Most of the Betula luminifera H Winkl secondary forests don’ t have the level to breed into timber forests.The aim to protect and use is for conservation of water and soil.Betula luminifera H Winkl species group distribute assembly in plane space.The distribution pattern is continued from seedling rebirth period to sapling forest and middle aged stand.In mature stand,species group distribution situation developed from assembly distribution of seedling rebirth and sapling forest to randomize or equality distribution.The apparatus distribution proportion of Betula luminifera H Winkl species group living weight is bole > branch > leaf.Bole occupies the largest and is 76.38%averagely.Leaf occupies the smallest and is 7.42 %.Branch is 16.20%.The cubic function model is the best forecast precision of living weight.The correlation coefficients are above 0.97. The forecast model of bole living weight is W?=-0.251+0.03X-(1.81E-005)X2+(1.12E-008)X3(X=D2H)From the observation of secondary forest,the average growth of breast height diameter and highness are reduced when the crop age increased in two different forests.The annual average growth of single volume of timber increased as the crop age increased.The annual average growth of cumulate declined when crop age increased before 12a.After 12a it will increased when crop age increased.There is no clear rule between breast height diameter,highness,single volume of timber and cumulate.For a long period,people look Betula luminifera H Winkl as fast growing tree. From the study,we know the forest break for frost disaster in winter. There is jamming.Most forests are not fast growing or fertility.We will choose better forestation land to breed Betula luminifera H Winkl timber forest with good fertility level and economy value.The main method will be manpower plant seedling and forestation.From the accidence result of foster intermediate cutting,we know the condign intermediate cutting is necessary in management to breed Betula luminifera H Winkl secondary forest into timber forest for construction, fitment,pit prop and etc.The intermediate cutting intension will be about 50%account from strains,with the condition of middling site conditions,7a forest age,normal growth forest,7500 plants/ hm2 density (500 plants / mu).The management experience,temporary sample plot inquiry and test sample plot long period observation will be assort.Advance the main technology measure of the Betula luminifera H Winkl secondary forest management in northwest of Guizhou.The steps are forest conservation, fire protection,seed tree conservation,thinning in reason,foster intermediate cutting,selection cutting,clear cutting patches,adequacy harvest cutting and etc.

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CLC: > Agricultural Sciences > Forestry > Forest tree species > Broad-leaved trees > Birch > Other
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