Hu Yan-Chen, Zhang Xiao-Lin, Han Xiao-Yi, Wan Xiao-Liang, Liang Tai-Ming, Lu Xiu-Jun
College of Forestry, Shenyang Agricultural University, Shenyang 110866, China.
Ying Yong Sheng Tai Xue Bao. 2022 Mar;33(3):727-732. doi: 10.13287/j.1001-9332.202203.003.
Six plots with an area of 0.1 hm were thinned in 2018. A field survey was carried out in 2020 to examine the effects of different stand densities (high: 900 trees·hm; medium: 720 trees·hm; low: 600 trees·hm) on growth and regeneration of stands and understory species diversity of secondary . forests in Qingyuan, Liaoning Province. Due to the short interval after thinning, there was no significant difference in tree height and diameter at breast height under different densities. However, the crown symmetry index under low stand density was significantly higher than that of high stand density, indicating that crown growth was more sensitive to stand density than trunk growth. The abundance of seedlings was the highest in the medium density, and the basal diameter of the seedlings with the same height was significantly higher, and the seedling regeneration and growth at the medium density were much better than the other two densities. A total of 70 species were recorded, belonging to 41 families and 67 genera. , , , and were the dominant species of trees and herbs, respectively. Simpson index, Pielou index and Shannon index of shrub layer and herb layer were the highest at the medium density. It indicated that the stand density of 720 trees·hm could help maintain the sustainable development of secondary forest in the mountainous area of eastern Liaoning.
2018年对6块面积为0.1公顷的样地进行了间伐。2020年进行了实地调查，以研究不同林分密度（高：900株·公顷；中：720株·公顷；低：600株·公顷）对辽宁省清原次生林林分生长与更新以及林下物种多样性的影响。由于间伐后间隔时间较短，不同密度下树高和胸径没有显著差异。然而，低林分密度下的树冠对称指数显著高于高林分密度，这表明树冠生长比树干生长对林分密度更敏感。中等密度下幼苗数量最多，相同高度幼苗的地径显著更大，中等密度下幼苗更新和生长比其他两种密度要好得多。共记录到70种，隶属于41科67属。 、 、 和 分别是乔木层和草本层的优势种。灌木层和草本层的辛普森指数、皮洛指数和香农指数在中等密度下最高。这表明720株·公顷的林分密度有助于维持辽东山区次生林的可持续发展。
