【摘要】 探究不同经营措施对杉木大径材林分林下植被种间联结的影响，对指导杉木大径材高效培育具有现实意义。本研究采用完全随机区组试验设计，运用x~2检验、方差比率法(V_R)、Spearman秩相关系数、M.Godron稳定性等计算方法，分析间伐+补植红锥(A)、间伐未补植(B)、未间伐未补植(C)这3种抚育经营方式对37年生杉木大径材林分林下植被优势种的种间关联性和群落稳定性的影响。研究结果表明，A经营措施林分林下植被物种丰富度、多样性及草本层物种数有显著提升(P<0.05);不同经营措施林分林下植被方差比率(V_R)存在显著差异(P<0.05),处理A林下植被总体关联性表现为正相关，而B、C经营措施林下植物总体关联性均为负相关；x~2检验与Spearman秩相关系数检验结果不一致，但均表明3种处理间物种相关性差异显著(P<0.05),2种检验方法下相关性显著的物种对数差异较大，体现检验方法灵敏性的不同；M.Godron稳定性分析结果表明，处理A林下植被群落整体稳定性最好。本研究表明，间伐+补植红锥经营措施林下植被群落稳定性和生态适应性较佳，对林下资源的利用率较高，更有利于杉木大径材林分林下植被更新演替。更多还原

【Abstract】 It is of practical significance to explore the effects of different management measures on interspecific associations of understory vegetation in Cunninghamia lanceolata large-diameter timber stands to guide the efficient cultivation of C.lanceolata large-diameter timber.A completely randomised block experimental design was used to analyze the effects of the management measures of intermediate felling+replanting of Castanopsis hystrix(A);intermediate felling without replanting(B);no intermediate felling without replanting(C) in 37-year-old C.lanceolata large-diameter timber stands using the x~2 test, the variance ratio method(V_R),the Spearman’s rank correlation coefficient, and M.Godron stability.The results of the study showed that understory vegetation species richness, diversity, and number of herbaceous layer species were significantly increased in the A management practice stand(P<0.05);the variance ratios(V_R) of understory vegetation in stands with different management measures were significantly different(P<0.05),and the overall correlation of understory vegetation in treatment A showed positive correlation, whereas the overall correlation of understory plants in both management measures B and C was negative; the results of the x~2 test and Spearman’s rank correlation coefficient test were inconsistent, but both indicated that the difference in species correlation between the three treatments was significant(P<0.05),and the number of significantly associated species pairs differed between the two tests, reflecting differences in the sensitivity of the tests; the results of the M.Godron stability analysis indicated that the overall stability of the understory vegetation community was best in management measure A.The results showed that management measure of intermediate felling+replanting of C.hystrix had better community stability and ecological adaptability of understory vegetation, higher utilisation of understory resources, and more conducive to understory vegetation regeneration and succession in C.lanceolata large-diameter timber forest stand.更多还原