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应用生态学报 ›› 2022, Vol. 33 ›› Issue (10): 2687-2694.doi: 10.13287/j.1001-9332.202210.001

• 研究论文 • 上一篇    下一篇

不同密度华北落叶松林天然更新及其影响因子

卫舒平, 梁文俊*, 魏曦, 卜瑞瑛, 姚佳峰   

  1. 山西农业大学林学院, 山西晋中 030801
  • 收稿日期:2022-02-28 修回日期:2022-04-26 出版日期:2022-10-15 发布日期:2023-04-15
  • 通讯作者: * E-mail: liangwenjun123@163.com
  • 作者简介:卫舒平, 女, 1996年生, 硕士研究生。主要从事水土保持和林业生态研究。E-mail: wxb_680218@163.com
  • 基金资助:
    国家自然科学基金项目(31901365,31971644)、山西省高等学校科技创新项目(2021L105)、山西省优秀博士来晋工作奖励资金科研项目(SXYBKY2018032)和山西农业大学科技创新基金项目(2018YJ09)

Natural regeneration of Larix principis-rupprechtii plantations with different densities and its influencing factors

WEI Shu-ping, LIANG Wen-jun*, WEI Xi, BU Rui-ying, YAO Jia-feng   

  1. College of Forestry, Shanxi Agricultural University, Jinzhong 030801, Shanxi, China
  • Received:2022-02-28 Revised:2022-04-26 Online:2022-10-15 Published:2023-04-15

摘要: 以关帝山区8种林分密度(128、240、320、400、480、560、640和720株·hm-2)华北落叶松纯林为研究对象,分析了不同密度下华北落叶松天然更新优劣及其影响因子。结果表明: 更新指数随林分密度增大先升高后降低,中密度(400~560株·hm-2)林分更新效果明显优于过疏和过密林分;林下光环境、草本植物及凋落物对落叶松更新有双重作用,光照过强、草本植物盖度过大或凋落物过厚不利于林下更新,土壤有机质可使土壤质地松软、水分含量充足并形成低磷高氮环境促进林分更新;各因子对更新指数的影响依次为:土壤含水量(0.798)>全氮(0.621)>凋落物厚度(-0.597)>土壤孔隙度(0.504)>土壤有机质(0.493)>全磷(-0.404)>林下总光照(-0.274)>草本植物盖度(-0.021)。在后续森林经营中,可通过抚育间伐或补植将林分密度控制在480株·hm-2左右,并适当清理林下凋落物,改善土壤条件,促进华北落叶松天然更新。

关键词: 天然更新, 华北落叶松, 土壤因子

Abstract: In this study, we analyzed the natural regeneration of Larix principis-rupprechtii pure plantations with stand densities of 128, 240, 320, 400, 480, 560, 640 and 720 trees·hm-2 in the Guandi Mountains and its influencing factors. The results showed that the regeneration index first increased and then decreased with the increases of stand density, and that the regeneration performance of stand with medium density (400-560 trees·hm-2) was significantly better than other stands. Light conditions, herbaceous plants and litter of the understory had a dual effect on the regeneration of L. principis-rupprechtii. Excessive light, herbaceous plant cover or over-thick litter was not instrumental to the regeneration. Soil organic matter promoted stand regeneration by providing soft soil texture, adequate water content, low phosphorus but high nitrogen. The effects of the examined factors on the regeneration index were as follows: soil water content (0.798) > total nitrogen (0.621) > litter thickness (-0.597) > soil porosity (0.504) > soil organic matter (0.493) > total phosphorus (-0.404) > transmitted total light (-0.274) > herbaceous plants cover (-0.021). In the plantation management, stand density could be controlled at about 480 trees·hm-2 by thinning or replanting, while litter could be cleared properly to improve soil condition and to promote natural regeneration of L. principis-rupprechtii.

Key words: natural regeneration, Larix principis-rupprechtii, soil factor