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2006年5月和2011年8月,以秦岭南坡商洛地区近自然经营的不同间伐强度(30%、20%、10%)下栓皮栎天然林为对象,未间伐林分为对照,分析了间伐前后林分的生长情况,以及间伐5年后种群更新、物种多样性和土壤肥力等指标的变化,并对抚育间伐后的林地更新、群落发育等效果进行综合评价.结果表明:1~6年生栓皮栎幼苗个体数量随着间伐强度的增加而增加,6年生以后的幼苗数量在各间伐强度下无显著差异;间伐10%、20%和30%样地的种群更新潜力分别比对照提高10.8%、28.5%和32.9%;间伐促进了乔灌层植株(尤其是喜光植物)胸径、树冠以及灌木层植株树高的增加,且随着间伐强度的增加,其促进作用越来越显著;间伐后林地的物种多样性和土壤肥力得到改善,表现为间伐30%>20%>10%>对照样地.在栓皮栎郁闭度≥0.85的天然林中,间伐强度30%(郁闭度保留0.6)更有利于其可持续发育.
In May 2006 and August 2011, the Quercus variabilis forest was planted under the natural deforestation (30%, 20%, 10%) in Shangluo area near the southern slope of Qinling Mountains. The growth of forest stands before and after thinning, and the change of population renewal, species diversity and soil fertility after five years of thinning were evaluated, and the comprehensive evaluation was made on the effects of regeneration and community development after thinning. The results showed that: 1 ~ 6 The number of seedlings of annual cork oak increased with the increase of thinning intensity, and the number of seedlings after 6-year-old had no significant difference among the cutting densities. The population renewal potential of 10%, 20% and 30% of the plots was increased by 10.8 %, 28.5% and 32.9%, respectively. The thinning promoted the increase of the tree height at canopy, crown and shrub layer of Q. officinalis plantations, especially the shrubs, and the promotion effect was more and more obvious with the increase of thinning intensity. The species diversity and soil fertility of the post-forest land improved, with the thinning rate of 30%> 20%> 10%> control plots.In the natural forest with Q. = 0.85, the thinning intensity was 30% 0.6) is more conducive to its sustainable development.