西北林学院学报2024，Vol.39Issue(4)：39-45,260,8.DOI:10.3969/j.issn.1001-7461.2024.04.05
不同间伐强度对华北落叶松人工林天然更新的影响
Effects of Different Thinning Intensities on the Natural Regeneration of Larix principis-rupprechtii Plantations
摘要
Abstract
The objective of this study was to investigate the effects of different thinning intensities on the spatial pattern and interspecific correlation of the natural regeneration of 30-year-old Larix principis-rup-prechtii plantations that is crucial for adjusting the spatial structure and conserving natural regeneration of the artificial forests in the Saihanba Forest Farm.The pure forest of L.principis-rupprechtii in Saihanba area was selected as the research object.Three kinds of thinning intensity were set up:high(60％-65％),medium(45％-50％)and low(35％-40％),and three fixed plots each with an area of 900 m2 were set respectively.The average tree density before thinning was 2 611 trees/hm2.The g(r)and g12(r)functions were utilized to investigate the changes in individual characteristics of natural regeneration,the spatial pat-tern between dominant canopy trees and natural regeneration,and the interspecific correlation under differ-ent thinning intensities.The results indicated no significant differences in species richness among the vari-ous thinning intensities.The medium thinning intensity exhibited the highest values for average height,av-erage diameter at breast height,and average crown width,reaching 52.68 cm,5.18 cm,and 34.49 cm,re-spectively.Only the average density was the lowest under the medium thinning intensity,at 93 stems/hm2.The spatial pattern of the dominant canopy layer was primarily random,while that of natural regeneration was predominantly aggregated.The interspecific correlation between natural regeneration and the dominant canopy layer was mainly unrelated.The resuls of this study suggests that a medium thinning intensity(45％-50％)is advantageous for adjusting the spatial structure of pure L.principis-rupprechtii planta-tions and conserving natural regeneration in the Saihanba Forest Farm.关键词
华北落叶松/抚育间伐/天然更新/空间点格局/种间关联性Key words
Larix principis-rupprechtii/tending thinning/natural regeneration/spatial point pattern/inter-specific association分类
农业科技引用本文复制引用
姜雨,白宇,吕宝磊,李丹阳,马莉薇..不同间伐强度对华北落叶松人工林天然更新的影响[J].西北林学院学报,2024,39(4):39-45,260,8.基金项目
河北省自然科学基金项目(C2021204002) （C2021204002）
2021年度引进留学人员资助项目(C2021036). （C2021036）
