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Study On The Relationgship Between Growth Pattern And Response To Climate Of Pinus Tabulaeformis In Lizi Forest Farm

Posted on:2018-03-07Degree:MasterType:Thesis
Country:ChinaCandidate:D R DuFull Text:PDF
GTID:2393330563955746Subject:Forestry
Abstract/Summary:PDF Full Text Request
This dissertation takes the main tree species of the artificial pinus tabulaeformis in Lizi Forest Farm as the research object,which adopts the method of fixed sample plot surveyed by the artificial pinus tabulaeformis' DBH growth observation from 2006 to 2016.And it also combines with the corresponding period of the meteorological factors through the study of pinus tabulaeformis plantation DBH growth and temperature,precipitation and air relative humidity correlation analysis,stepwise regression analysis and path analysis in that area,which aims to explore different altitude plantation age pinus tabulaeformis in 2006-2011 and DBH growth during 2011-2016 with the corresponding period of various meteorological factors relationship.The purpose is to slightly reveal the artificial community and the growth characteristic of trees in Lizi Forest Farm.To find significant effects on the growth of meteorological factors,in order to provide the reference to artificial community slightly management in Lizi Forest Farm.The main conclusions were as follows:1.The variation in the size of artificial pinus tabulaeformis plantation DBH in the region varies greatly.The lower elevations(1601m and 1645m)were significantly higher in the size of the artificial oblong(1750m and 1799m)than in high-altitude areas(1750m and 1799m).2.Between 2006 and 2011,the growth rate of artificial pinus tabulaeformis in the region was higher than that of artificial pinus tabulaeformis in between 2011 and 2016.3.Based on correlation analysis between the artificial pinus DBH growth and meteorological factors,and regards pinus tabulaeformis DBH growth as the dependent variable(y),the correlation between strong meteorological factors as the independent variable(x)stepwise regression,the coefficient of regression equation is obtained,an optimal pinus tabulaeformis DBH growth and meteorological factor regression equation model is built.The effect of the meteorological factors on the average growth of the oil on the pine forest which was determined by the method of size analysis via the direct and indirect path coefficient.Research shows that:1)In low elevations,the size of the artificial size of the manubrium sternum from 2006 to 2010 was directly positive for the 3-may rainfall.The indirectly negative effect of the temperature of 3-5 months.During the period of 2011 ~ 2016,the growth of the artificial size of the manubrium sternum was directly positive for the average air relative humidity,and the temperature has mainly indirectly negative effect in 3-5 months.Results show that in low altitude area,2006-2011,3-5 month rainfall and low temperature is advantageous to the artificial pinus tabulaeformis DBH growth,2011 ~ 2016 annual air relative humidity and the increasing temperatures in 3 to 5 month is bad for artificial pinus tabulaeformis DBH growth.That is,the average annual air relative humidity in the rainfall of 3-5 month are favorable for the growth of the artificial pinus tabulaeformis BDH,and the increase of the temperature in 3-5 is bad for the growth of the artificial pinus tabulaeformis BDH growth.2)In high altitude area,artificial pinus tabulaeformis DBH growth from 2006 to 2011 in 6-8 is largely influenced by direct path coefficient of relative humidity and indirect path coefficients,which has the direct positive effect;From 2011 to 2016,6-8 rainfall have directly positive effect on artificial pinus tabulaeformis DBH growth,in high altitude area,six to eight months rainfall is conducive to artificial pinus tabulaeformis DBH growth.
Keywords/Search Tags:Pinus tabulaeformis, DBH growth, climatic factors, stepwise regression analysis, path analysis
PDF Full Text Request
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