对青海麦秀林场 2 个 50m×50m 紫果云杉( Picea purpurea Mast.) 样方调查和 604 株树木年轮系统及 157 个树
桩的分析结果表明:2 个样方的干扰强度总体都较高, 如 PⅠ 样方 1950′s 达到 31.4% 10a, PⅡ样方 1980′s 达到
18 .1% 10a, 说明存在经常性的择伐或盗伐活动, 设定近 30 a 来实际发生的干扰强度用树桩断面积与树桩和树木断
面积的百分率来表示, 并与用树轮分析的干扰重建百分比相比较, 结果发现具有正态树龄分布的 PⅠ 样方的重建值
与实际值较为接近, 而不具有正态树龄结构分布的PⅡ样方, 其重建值明显高于实际值。
 

Two 50m×50m sample plots in the secondary forest of Picea purpurea Mast .in Maixiu, Qinhai Province were investigated for reconstructing disturbance intensity .Based on the analysis of 604 tree ring series and 157 stumps, it was found that the intensities of disturbance in both plot Ⅰ and plot Ⅱ generally were high, for example, it reached 31 .4 %10a in 1950′s in plot Ⅰ and 18 .1 %10a in 1980′s in plot Ⅱ, which indicated local frequent activities of selective or illegal cutting .The percent rate between section area of tree stumps and all section area of trees and stumps which was assumed to be the actual disturbance intensity of recent 30a were also compared with the reconstructed percent rate from tree ring analysis .It was found that the reconstructed rate was close to the actual rate in plot Ⅰ with a normal distribution of tree age structure, but it was larger than the actual rate in plot Ⅱ with non-normal distribution of tree age structure .