林业科学2011，Vol.47Issue(8)：7-13,7.
长白落叶松人工林林隙间伐对林下更新及植物多样性的影响
Effect of Gap Thinning on the Regeneration and Plant Species Diversity in Larix olgensis Plantation
摘要
Abstract
The regeneration and plant diversity in different sized gaps and understorey were investigated in a 34-year-old Larix olgensis plantation in 8 years after thinning operated respectively only in gaps and uniformly in a stand. The results showed that saplings of shade tolerant tree species ( Juglans mandshurica, Populus davidiana, Ulmus japonica ) with height more than 1. 5 m were found in gaps rather than understorey in the uniformly thinned stand. Even higher saplings more than 2 m of J. mandshurica was found in relatively large gaps. Simpson diversity index and coverage of woody species in gaps were greater than understorey of the uniformly thinned stand ( P < 0. 05 ) , and the coverage in large gaps was greater than that in small gaps ( P < 0. 05 ). There was significant difference in the composition of under canopy functional groups. The ranking of importance values of woody competitor species was; large gaps small gaps, and understorey of the uniformly thinned stand, and the ranking of importance values of stress tolerant species was opposite ( P < 0. 05 ). In large gaps, annual herby species had greater importance value and perennial herby species had lower importance value than those in small gaps and understorey of the uniformly thinning stand ( P < 0. 05 ). The importance values of weeds in Grime' strategy groups in large gaps were greater than that in small gaps and understorey of the uniformly thinned stand ( P < 0. 05 ) . Our results suggested that gap thinning, combined with uniformly thinning of forests were able to transform the pure L. olgensis into a mixed forest with the larix, and promote natural regeneration and improve plant diversity, and the performances were better in relatively larger gaps (120-150 m2).关键词
长白落叶松/人工林/近自然化改造/林隙间伐/均匀间伐/更新/植物多样性Key words
Larix olgensis/ plantation forest/ close-to-nature transformation/ gap thinning/ uniform thinning/ regeneration/ plant diversity分类
农业科技引用本文复制引用
张象君,王庆成,郝龙飞,王石磊..长白落叶松人工林林隙间伐对林下更新及植物多样性的影响[J].林业科学,2011,47(8):7-13,7.基金项目
黑龙江科技计划项目“人工林天然化经营技术研究与示范”(GA07B301-06). （GA07B301-06）
