43Measurementandmonitoringmodelsoftreevolume,biomassandcarboncoefficientsI 2 3 34.3樣木數(shù)據(jù)采集 34.4樣地數(shù)據(jù)采集 3 3 3 36.2林分平均樹高計算 3 36.4生長率計算 3 3 36.7相對直徑計算 3 46.9林分形高計算 4 4 47.2模型結構 4 7.4模型評價 本文件按照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(guī)則》的規(guī)定——第2部分：杉木立木材積與生物量模型；——第6部分：其他軟闊立木材積與生物量模型；——第8部分：主要森林類型相對樹高曲線模型；請注意本文件的某些內(nèi)容可能涉及專利。本文件的發(fā)布機構不承擔識別專利的責任。為便于標準的使用、實施以及后續(xù)擴展，DB43/T3080《湖南省立木材積、生物量及碳系數(shù)計——第2部分：杉木立木材積與生物量模型?！?部分：其他軟闊立木材積與生物量模型?！?部分：主要森林類型相對樹高曲線模型。1湖南省立木材積、生物量及碳系數(shù)計量監(jiān)測系列模型（類）、馬尾松（Pinusmassoniana類）、楊樹類（Pop3.13.23.3胸徑diameteratbreas2林木距地面或根頸1.3m處的帶皮直徑（坡3.43.53.63.73.83.9），3.103.11按照一定的抽樣方法和要求抽取的、用于采集林業(yè)數(shù)表編制所需數(shù)3.123.134樣本采集34.2樣本分布4.3樣木數(shù)據(jù)采集6.4生長率計算根據(jù)樣地調(diào)查結果，以樣地各株立木胸徑除以樣地平均胸徑得到各株立木相對4根據(jù)樣地調(diào)查結果，以樣地各株立木樹高除以樣地平均樹高得到各株立木相對按照歷史經(jīng)驗和LY/T2416-2015中H=c0DC1············································································(1)H=1.3+c0DC1e一C2D···············H——樹高，單位為米（mD——胸徑，單位為厘米（cm5D——胸徑，單位為厘米（cmH——樹高，單位為米（mh——從樹干根頸0cm處至某相對位置的長度，單位為米（mk=c1+c2z+c3z2+c4z3+c5z4+c6z5+c7(D/H)D——胸徑，單位為厘米（cmH——樹高，單位為米（mh——從樹干根頸0cm處至某相對位置的長度，單位為米（mz——h與H的比值（Z=h/H無量綱；f(X)——分別徑階擬合式（7）后，其參數(shù)c0與D/H、D、H、z的關系模型。依據(jù)LY/T2102-2013確定由式（12）建立二元立木材積常規(guī)模型），V=c0DC1HC2·······································································(12)V=c0Df1(D,H)Hf2(D,H)································································(13)D——胸徑，單位為厘米（cmH——樹高，單位為米（m6模型代替式（12）中的樹高，重新擬合樹高曲線模型的參數(shù)，模型通式見式V=c0DC1···················································EQ\*jc3\*hps21\o\al(\s\up7(=),H)EQ\*jc3\*hps24\o\al(\s\up7(D),f)EQ\*jc3\*hps14\o\al(\s\up7(1H),D)D——胸徑，單位為厘米（cmH——樹高，單位為米（mV=c0DEQ\*jc3\*hps17\o\al(\s\up5(C),0)1····················································V=c0DEQ\*jc3\*hps17\o\al(\s\up5(C),0)1HC2·······································································(18)H=f(D0)··········································································(19)V=c0DEQ\*jc3\*hps17\o\al(\s\up5(C),0)1f(D0)C2···················································EQ\*jc3\*hps24\o\al(\s\up7(D),f)EQ\*jc3\*hps24\o\al(\s\up7(H),0)V——立木材積，單位為立方米（m3D0——地徑，單位為厘米（cmH——樹高，單位為米（mB=c0(D2H)C1······································································(22)B=c0DC1HC2·······································································(23)B=c0DC1HC2CWC3CLC4······························································(24)7B——立木生物量,單位為千克（kgD——胸徑，單位為厘米（cmH——樹高，單位為米（mCW——冠幅直徑，單位為米（mB總——立木總生物量，單位為千克（kgB地上——立木地上生物量，單位為千克（kgB地下——立木地下（根）生物量，單位為千克（kg7.2.4.3.2假設干材占地上生物量的相對比例為1，干皮、樹枝和樹葉占地上生物量B地上——立木地上生物量，單位為千克（kgB干材——立木干材生物量，單位為千克（kgB干皮——立木干皮生物量，單位為千克（kgB枝——立木樹枝生物量，單位為千克（kgB葉——立木樹葉生物量，單位為千克（kg8立木碳儲量與立木生物量呈正線性相關，同時與林木胸徑、樹高相關。設C=c0B·················································C=(c0+c1D)B·····························C=(c0+c1H)B····································C——立木碳儲量，單位為千克（kgB——立木生物量，單位為千克（kgD——胸徑，單位為厘米（cmH——樹高，單位為米（mC地上——立木地上碳儲量，單位為千克（kgC地下——立木地下（根）碳儲量，單位為千克（kgRHi——立木相對樹高，無量綱；RDi——立木相對直徑，無量綱；9依據(jù)LY/T3183-2020在式（33式（36）中選擇林分形高模型結FH=C0+C1H+C2H2·································································(33)FH=C0+C1H······································································(34)FH=C0+eC1/H·····································································(35)FH=C0HC1·········································································(36)FH——林分形高；H——林分平均樹高，單位為米（mPD=C0DC1··········································································(37)PD——林木胸徑生長率（%PV=C0DC1··········································································(38)PV——林木材積生長率（%·························PM——林分蓄積量