摘要
分别对黄龙山林区近自然经营间伐强度为15%(弱度间伐)、30%(中度间伐)和45%(强度间伐)的油松人工林进行样地调查,以未间伐林为对照,研究间伐7年后油松人工林幼苗更新、林分生长、物种多样性和土壤特性等指标的变化,评价间伐抚育的效果.结果表明:随着间伐强度的增加,1～7年生油松幼苗的数量和各项生长指标均增加,而生长指标的年均增长率表现出先增大后减小的趋势,且以中度间伐最大;与对照相比,弱度、中度和强度间伐使油松单株材积分别提高了20.9%、32.1%和52.6%,单位面积蓄积量分别减少了4.4%、15.1%和25.3%,但蓄积量的年均增长率却增加了28.6%、46.2%和82.0%;间伐样地内的物种多样性和土壤特性得到改善,表现为强度间伐>中度间伐>弱度间伐>未间伐.本试验条件下,间伐强度45%更适宜黄土高原地区油松人工林的抚育管理.
A sampling plot investigation was conducted on the seedling regeneration, stand growth, species diversity, and soil characteristics in a Pinus tabulaeformis plantation in Huanglong Mountain on the I^ess Plateau of Northwest China after 7 years of close-to-natural management thinning 15% （light thinning）, 30% （medium thinning）, and 45% （heavy thinning）, with the effect of differ- ent thinning intensities evaluated. With the increase of thinning intensity, the amount and growth indices of 1-7 years old P. tabulaeformis seedlings increased, but the mean annual increments of the growth indices decreased after an initial increase, with the maximum under medium thinning. As compared with the control （ un-thinned plantation）, the individual volume under light, medium, and heavy thinning was increased by 20.9%, 32.1% and 52.6% , the volume per hm2 decreased by 4.4% , 15.1% , and 25.3% , and the mean annual growth rate of volume increased by 28.6% , 46.2% and 82.0%, respectively. The species diversity and soil characteristics were improved under thinning, with the order of heavy thinning 〉 medium thinning 〉 light thinning 〉 un-thinning. In this study, 45% thinning was most suitable to the management of P. tabulaeformis plantation in Huanglong Mountain.
出处
《应用生态学报》
CAS
CSCD
北大核心
2013年第5期1313-1319,共7页
Chinese Journal of Applied Ecology
基金
中国科学院战略性先导科技专项(XDA05060300)
"十二五"国家科技支撑计划项目(2012BAD22B0302)资助
关键词
油松人工林
近自然经营
幼苗更新
林分生长
物种多样性
土壤特性
Pinus tabulaeformis plantation
close-to-natural forest management
seedling regenera- tion
stand growth
species diversity
soil characteristics.
