塞罕坝华北落叶松人工林合理抚育间伐参数的研究

2013年夏季以河北塞罕坝地区7个林龄的华北落叶松人工林林分为研究对象，对样地进行每木检尺。以15a生林分平均木制作解析木5株，并进行年轮分析后，以林分胸径连年生长量的变化为依据，研究确定了不同立地条件的抚育起始期、抚育间隔期，最后基于合理经营密度确定间伐强度。曼甸立地林分，在第10年进行间伐，每6~8a进行一次间伐，抚育强度应在42.18%~62.50%；阳坡薄土立地林分，在第14年进行间伐，每5~10a进行一次间伐，抚育强度在35.75%~60.57%；阴坡厚土立地林分，在第10年进行间伐，每5~8a进行一次间伐，抚育强度应在29.31%~54.10%。本研究为冀北山区人工用材林的抚育间伐工作及提高森林资源质量等提供一定的科学依据。

Research on Thinning Parameters of Larix Princicpis-rupprechtii Plantations in Saihanba

In summer 2013,Larix Princicpis-rupprechtii stands of 7 different stand ages in Saihanba were surveyed.Every tree in temporary plot was measured its DBH and tree height and the average tree was tree-ring analyzed.This paper determined the start period of thinning,thinning interval and thinning intensi-ty of Larix Princicpis-rupprechtii stands at different sites.At Mandian site,the first thinning should be start at 10 years old.The thinning interval was 6~8 year and the thinning intensity was 42.18%~62.50%.At site of sunny slope and thin soil,the first thinning should be start at 14 years old.The thinning interval was 5~10 year and the thinning intensity was 35.75%~60.57%.At site of shady slope and thick soil,the first thin-ning should be start at 10 years old.The thinning interval was 5~8 year and the thinning intensity was 29.31%~54.10%.This study provide scientific basis for the most proper management of Larix Princicpis-rup-prechtii forests.