馬尾松二元立木材積表范圍本文件規定了XX自治區馬尾松二元材積主要技術計量術語與定義、相關模型及表的使用方法。本文件適用于馬尾松林木在廣西的適生區。規范性引用文件下列文件中的內容通過文中的規范性引用而構成本文件必不可少的條款。其中，注日期的引用文件，僅該日期對應的版本適用于本文件；不注日期的引用文件，其最新版本（包括所有的修改單）適用于本文件。GB/T1.1—2020標準化工作導則第1部分：標準化文件的結構和起草規則LY/T2416-2015林業數編制數據采集技術規程LY/T2102-2013二元立木材積表編制技術規程術語和定義下列術語和定義適用于本文件。

胸徑thediameteratbreastheight從根莖起向上1.3m處樹干的帶皮直徑。

徑階thediameterclasses林木胸徑的整化，即把一定區間范圍內的胸徑整化為胸徑數值階層，并用該區間范圍內的中間數值來表示。

相對胸徑therelativediameteratbreastheight指樣地各徑階平均胸徑或單株立木胸徑與樣地平均胸徑的比值。

地徑thegrounddiameter指立木根莖起向上5cm處的直徑。

樹高thetreeheight從根莖起向上到樹梢的樹干全部高度。

樹高階thetreeheightclasses林木樹高的整化，即把一定區間范圍內的樹高整化為樹高數值階層，并用該區間范圍內的中間數值來表示。

相對樹高therelativetreeheight指樣地各徑階平均樹高或單株立木樹高與樣地平均樹高的比值。

二元立木材積表thebinarytreevolumetable指依據立木材積與胸徑、樹高兩個因子的關系編制的立木材積計量數表。

立木材積thetreevolume不包括枝丫材積的全樹干材積。二元立木材積計算相關模型及表馬尾松二元立木材積模型及表 V=0.00007645×D1.75859×H1.00835 式中：V——立木材積，單位：m3;D——胸徑，單位：cm;H——樹高，單位：m。依據該模型展開的二元立木材積表見附錄A。馬尾松地徑對胸徑回歸模型 D=-1.49427+0.85007×D0 （AUTONUM式中：D——胸徑，單位：cm;D0——地徑，單位：cm。馬尾松相對樹高曲線模型 R?=(1-e-2.25459)式中：Rh——相對樹高；Rd——相對胸徑；e——自然指數。使用方法徑階劃分徑階按2cm級距劃分，如5.0～6.9cm為6徑階，7.0～8.9cm為8徑階。樹高階劃分樹高階按1m級距劃分，如5.5～6.4m為6樹高階，6.5～7.4m為7樹高階，但4.0～4.4m為4樹高階。胸徑計算胸徑一般需要實測；若在無法實測的情況下（如采伐跡地上只保留有伐根的情況），計算原立木胸徑可依據實測的地徑代入模型（2）直接計算。相對胸徑計算根據樣地每木檢尺計算結果得出樣地平均胸徑，以樣地各徑階平均胸徑或各單株立木胸徑除以樣地平均胸徑得到各徑階相對胸徑或各單株立木相對胸徑。相對樹高計算計算單株立木相對樹高、徑階相對樹高可根據單株立木、徑階相對胸徑代入模型（3）直接計算。樹高計算進行樣地調查時，一般需要對各徑階平均樹高進行實測；為了提高工作效率，也可將各徑階相對胸徑代入模型（3）計算得出相對樹高值再乘以樣地平均樹高得到各徑階的樹高估計值。立木材積計算計算單株立木材積可依據實測或模型估計的胸徑、樹高值查附錄A，或者將單株立木實測或模型估計的胸徑、樹高代入模型（1）直接計算。

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廣西馬尾松二元立木材積表廣西馬尾松二元立木材積表DH456789101112131460.007230.009050.010880.012710.014540.016370.018200.02004———8—0.015010.018040.021070.024110.027150.030190.033240.036290.039340.0423910——0.026710.031200.035690.040200.044700.049210.053720.058240.0627612———0.042990.049190.055390.061600.067810.074030.080250.0864814————0.064500.072640.080780.088930.097080.105240.1134116—————0.091860.102160.112460.122780.133100.1434318——————0.125670.138350.151030.163730.1764320———————0.166510.181780.197060.2123522———————0.196900.214950.233020.2511024————————0.250490.271550.2926226—————————0.312590.3368528——————————0.3837330——————————0.43324DH1516171819202122232425100.067280.071800.07633————————120.092710.098940.105180.111420.11766——————140.121580.129750.137930.146120.154300.162490.170690.17889———160.153760.164100.174440.184790.195150.205500.215870.226230.236610.24698—180.189150.201860.214590.227320.240060.252800.265550.278300.291060.303820.31659200.227650.242960.258270.273590.288920.304260.319600.334950.350310.365670.38104220.269190.287290.305400.323520.341650.359780.377920.396070.414230.432400.45057240.313700.334790.355900.377010.398140.419270.440410.461560.482720.503890.52506260.361110.385400.409690.434000.458310.482640.506980.531330.555690.580050.60443280.411380.439040.466720.494410.522110.549830.577550.605290.633040.660800.68856300.464450.495680.526920.558190.589460.620750.652060.683370.714700.746040.77739320.520270.555250.590260.625270.660310.695360.730430.765510.800600.835700.8708234—0.617720.656660.695620.734600.773590.812600.851630.890670.929720.9687936—0.683040.726100.769180.812280.855390.898530.941680.984851.028041.0712438——0.798530.845900.893300.940720.988161.035611.083091.130581.1780940——0.873910.925750.977631.029521.081441.133371.185331.237311.2893042———1.008691.065211.121761.178321.234911.291531.348161.4048144———1.094681.156021.217391.278781.340191.401631.463091.52457表A.1廣西馬尾松二元立木材積表（續）DH151617181920212223242546———1.183691.250021.316371.382751.449161.515591.582051.6485348————1.347161.418671.490211.561781.633381.705001.7766550————1.447431.524261.601131.678031.754951.831901.9088852————1.550791.633111.715461.797851.880271.962712.0451954————1.657211.745181.833181.921222.009292.097402.1855456—————1.860441.954252.048112.142002.235922.3298858—————1.978862.078652.178482.278352.378252.4781960—————2.100432.206352.312312.418312.524352.6304362—————2.225112.337312.449572.561862.674192.7865764—————2.352882.471532.590222.708962.827752.9465866—————2.483712.608962.734252.859602.984993.1104268—————2.617582.749582.881633.013743.145883.2780870—————2.754482.893383.032343.171353.310413.4495272————2.748482.894383.040343.186353.332423.478543.6247274————2.884163.037253.190423.343643.496923.650263.8036576————3.022643.183093.343613.504193.664833.825523.98628DH2627282930313233343536180.32936——————————200.396410.411780.42716————————220.468740.486920.505110.52330———————240.546250.567430.588630.609830.631040.65225—————260.628810.653200.677600.702010.726420.750840.77526————280.716340.744130.771920.799720.827540.855350.883180.911010.93885——300.808750.840120.871500.902890.934290.965690.997111.028531.059961.09140—320.905950.941090.976241.011401.046581.081761.116951.152151.187361.222581.25780341.007871.046971.086071.125191.164321.203461.242611.281771.320941.360121.39931361.114451.157681.200921.244171.287441.330721.374011.417311.460621.503951.54728381.225621.273161.320711.368281.415861.463461.511071.558691.606321.653971.70162401.341311.393341.445381.497441.549521.601601.653711.705821.757951.810101.86225421.461481.518171.574871.631601.688341.745091.801861.858651.915451.972262.02909441.586071.647591.709131.770691.832271.893861.955472.017102.078742.140402.20207461.715031.781561.848101.914661.981252.047852.114472.181112.247762.314432.38112481.848321.920011.991732.063472.135222.207002.278802.350622.422452.494302.56617501.985892.062922.139972.217052.294152.371272.448412.525572.602752.679952.75717522.127692.210232.292782.375362.457972.540592.623242.705912.788612.871322.95405542.273702.361892.450122.538362.626642.714932.803252.891602.979973.068353.15676562.423872.517892.611932.706012.800112.894242.988403.082583.176783.271003.36525表A.1廣西馬尾松二元立木材積表（續）DH2627282930313233343536582.578162.678162.778202.878262.978363.078483.178623.278803.379003.479223.57947602.736542.842692.948873.055083.161323.267593.373893.480223.586583.692963.79936622.898983.011433.123913.236433.348973.461553.574163.686803.799473.912174.02489643.065443.184353.303293.422273.541283.660323.779403.898504.017644.136814.25600663.235903.361423.486973.612563.738193.863853.989554.115284.241044.366844.49266683.410323.542603.674923.807293.939694.072124.204604.337104.469644.602224.73482703.588683.727883.867124.006404.145734.285094.424494.563934.703404.842914.98245723.770943.917214.063524.209884.356284.502734.649214.795734.942285.088875.23550743.957094.110584.264114.417704.571324.724994.878715.032465.186255.340085.49394764.147094.307954.468864.629824.790824.951875.112965.274105.435275.596495.75774DH3738394041424344454647341.43851——————————361.590631.63398—————————381.749291.796971.84466————————401.914421.966602.018792.07099———————422.085932.142782.199652.25653———————442.263762.325462.387172.448902.51064——————462.447822.514542.581272.648012.714772.78155—————482.638062.709962.781882.853812.925762.99772—————502.834402.911662.988933.066223.143523.220843.29817————523.036803.119573.202363.285173.367993.450833.53369————543.245193.333643.422113.510603.599113.687633.776173.86473———563.459523.553813.648133.742463.83681