20年生杉木人工林干物质积累及相对生长模型研究

Dm Accumulation and Growth Model of Cunninghamia lanceolata Plantation

在闽侯县荆溪镇三块立地条件大体属好、中、差不同坡位的杉木人工林样地进行生物量调查,调查结果表明,20年生杉木人工林在不同立地条件下干物质积累量差异显著,下坡干物质积累量(生物量)为154.2 t.hm-2,其中干、枝、叶的生物量分别为128.9、13.0、12.3 t.hm-2,干材积年增长量为19.63 m3.hm-2;而上坡干物质积累量仅为62.6 t.hm-2,其中干、枝、叶的生物量分别为48.1、7.4、7.1 t.hm-2,干材积年增长量仅为5.64 m3.hm-2,干、枝、叶、林分总生物量及干材积年增长量分别是下坡的37.3%、56.9%、57.7%、40.6%、28.7%。干的生物量、干的去皮材积可分别用WS=0.034 20(D2H)0.881 4、VS=0.000 046 47(D2H)0.966 5生长模型预测,枝、叶生物量分别符合经验公式1/WB=1/(0.002 831×D2H)+1/14.9、1/WL=1/(0.002 747×D2H)+1/13.71。

Biomass of Cunninghamia lanceolata plantation was investigated on 3 plots with better, middle ＆ poor slope in Jingxi town in Minhou County. Results show that Dm accumulation of 20-year-old Cunninghamia lanceolata plantation shows significant differences in different sites. Dm accumulation （biomass） is 154.2 t · hm^-2 at downhill among these, biomass of trunk, branch, leaf is 128.9 , 13.0, 12.3 t · hm^-2 respectively. Annual trunk volume increment is 19.63m^3 · hm^-2. Dm accumulation uphill is 62.6 t · hm^-2. Trunk, branch, leaf, total stand biomass, annual trunk volume increment is 37.3%, 56.9% , 57.7%, 40.6%, 28.7% of downhill. Biomass and volume inside bark of branch should forcast growth model by the formula of Ws = 0.034 20 （D2 H）^0.8814 and Vs = 0. 000 046 47 （D^2H）^0.9665 respectively. Biomass of branches and leaves accord with empirical formula of 1/WB = 1/（0.002 831 × D^2H） ＋ 1/14.9 and 1/WL = 1/（0.002 747 ×D^2H） ＋ 1/13.71 respectively.