马尾松人工林种群自然稀疏模型的研究

SELF-THINNING MODEL IN PLANTATION OF PINUS MASSONIANA LAMB.

摘要:

在福建北部丘陵山区生长发育正常的各种类型的马尾松人工林中，设置固定样地，测算胸径、株高、优势高、株数、蓄积量、年龄等数据，以植物种群生物量增长模型dB/dt=rB[1-(B/K)^θ]和3／2自疏法则为理论依据，出森林自然稀疏过程密度变化规律的模型：N＝｛[A(1+ce^-ft)^b]^-p-[A(1+ce^-ft₀)^b]^-p+N₀^-p｝^-1/p，该模型适用于描述各种密度林分的自然稀疏规律。经用闽北马尾松人工林固定样地资料验证，证明此模型能很好地拟合实际的密度观察资料，显示了较高的准确性和较大的适用性，有良好的使用价值。

Abstract:

Data for breath height diameter, stand height，number of individuals，standing biomass plant age we measured from 256 temporary plots and 24 permanent undisturbed plots of Pinus massoniana plantations on hilly land of north Fujian Each plot covered an area of 0.06-0.08 hm^-2 Permanent plots were investigated for five times in the study. The original stand density was 3 000-4 500 trees aged from 8 to 34 with site index of 16 m．Self-thimting mode1 was based on the model for biomass of population growth, ie. dB/dt=rB[1-(B/K)^θ] and by law of 3／2 self-thinning，from which the following model was dcduced：N＝｛[A(1+ce^-ft)^b]^-p-[A(1+ce^-ft₀)^b]^-p+N₀^-p｝^-1/p. This modeI can well imitate the actual population density observed，suggesting that it is a more accurate and applicable model．