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ID:37412123
大小:1.35 MB
页数:36页
时间:2019-05-23
《额济纳胡杨林生长过程的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要本文利用胡杨林同一标准地不同年龄的三株解析木的胸径、树高及材积的调查数据,选取11种生长经验方程对额济纳胡杨林的生长规律和生长模型进行了研究。根据相关指数(R2)最大以及剩余残差平方和(SSe)最小的原则,选取最优的模拟方程,模拟出额济纳地区天然胡杨树高、胸径及材积与年龄的最优生长经验方程。3株解析木的胸径拟合最优方程是吉田正男方程,分别为:y=14.844/(1+965.867t。3·蝻)+O.815、y=O.968/(1+4.06X103t喝‘姻)+1.327、y--8.374/(1+3.44×103t咀酗)+0.3
2、69:树高拟合最优方程是柯列尔方程,分别为y=1.467t仉翩e吼吧‘、y=O.815t¨∞e-O.069‘、y-1.358t0’6船e吨0““;材积拟合最优方程分别为混合型方程y=O.815t¨%e-O.帆、修正Weibull方程Y=O.038(1一e-O.OOlt3“)、混合型方程y=l/(-158.93+2.10×10qt.1瑚5)。并运用X2检验法来检验所选方程,结果表明,预测值与实测值的差异性不显著。在此基础上探讨了额济纳胡杨的生长状况,结果表明胡杨生长具有明显的阶段性。关键词:胡杨;直径:树高;材积;生长过程:生
3、长模型StudiesonthegrowingprocessofPopuluseuphraticaOliver●1一●●mEllna^bstractInthispaper,westudiedthegrowthpattemandthegrowthmodelofPopuluseuphraticaOliverinEjinabyusing1growthexperienceequation,whichalsousedthediameter、heightandvolumeofthethreetimberinthesamestandardg
4、roundandinthedifferentagegroups.Accordingtotheprincipleofrelevantindex(R2)Maximumandthesumofsquares(SSe)ofresidualtheminimumtwofactors,selectthebestsimulationequationstosimulateanEjinaareaofnaturalPopuluseuphraticaOliverheight,diameterandvolumegrowthofage—optimalem
5、piricalequation.ItisbestfittedtheequationofDBH.whichwasrepresentedtheMasaoYoshidaequationy=0.968/(1+4.06x103f3·629)+1.327,MasaoYoshidaequationy=0.968/(1+4.06x103t。3·629)+1.327,MasaoYoshidaequationy=8.374/(1+3.44x103t。朋)+O.369:treeheightequationswel'ethebestfittedRo
6、J甥cpequationy=1.467to’68e’0-02l,Roa叠cpequationy--O.815t1.136一。069tandRonzcpequationy=1.358to·622e-o·024t,volumeequationswerefittedbestmixedequationy=l/(13.596+1.218×105t’3·478),amendedWeibullequationY=0.038(1一e卸·∞1f3心),mixedequationy=l/(.158.93+2.10x10-3t-1-285).An
7、dbyusingthex2testmethodtotesttheselectedequation,theresultsshowedthatitWasnotsignificantbetweenthedifferencevaluesofpredictedandmeasured.Onthisbasis,wediscussedthesituationofPopuluseuphraticaOliverinEjina,theresultsshowedthatthegrowthofPopuluseuphraticaOliverhaveob
8、viousstages.‘KeyWords:PopuluseuphratieaOliver;Diameter;Treeheight;Volume;Growingprocess;GrowingmodelDirectedby:Prof.ZHANGMingTieAppIicantforMaste
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