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生态学杂志 ›› 2012, Vol. 31 ›› Issue (09): 2191-2196.

• 研究报告 • 上一篇    下一篇

辽东山区次生林冠下红松生长与顶端透光环境的关系

苗杰1,2,3,于立忠1,2**,孙一荣1,2,3   

  1. (1中国科学院沈阳应用生态研究所, 沈阳 110016; 2中国科学院清原森林生态实验站, 沈阳 110016; 3中国科学院研究生院, 北京 100049)
  • 出版日期:2012-09-10 发布日期:2012-09-10

Effects of secondary forest canopy openness on the growth of Pinus koraiensis saplings in eastern Liaoning Province of Northeast China.

MIAO Jie1,2,3, YU Li-zhong1,2**, SUN Yi-rong1,2,3   

  1. (1Institute of Applied Ecology, Chinese Academy of Sciences; 2Qingyuan Experimental Station of Forest Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 3Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2012-09-10 Published:2012-09-10

摘要: 通过调查3种不同人为干扰强度(轻度择伐、重度择伐和皆伐)下次生林林分结构及其冠下红松生长状况,应用全天空照片法测定红松(Pinus koraiensis)顶端的透光孔隙度,分析红松当年高生长量与顶端透光环境的关系。结果表明:以蒙古栎(Quercus mongolica)为建群种的皆伐样地林冠下,林分透光较强,以杂木阔叶林为主的轻度择伐样地和重度择伐样地林冠下,林分透光较弱;对29年生红松生长起主要阻碍作用的是下木层(≥10 m)阔叶树;在透光较好的皆伐样地内,红松当年高生长量均比透光较弱的轻度择伐样地和重度择伐样地高,红松当年高生长量与顶端林分透光孔隙度显著正相关(R2=0.516,P<0.01);为促进辽东山区次生林向阔叶红松林正向演替,应调控红松顶端林分透光孔隙度达30%以上。

关键词: 根系特性, 矿物钾活化量, 植物高钾机理

Abstract: To understand the effects of light regimes on the height growth  of Pinus koraiensis saplings, an investigation was made under the canopies of secondary forests treated by light thinning (stand A), heavy thinning (stand B), and clear cut (stand C) as well as the currentyear height growth of P. koraiensis under the canopies. The canopy openness on the top of P. koraiensis saplings was measured by hemispherical photographs, and the relationship between the light regimes and the height growth increment of P. koraiensis saplings was established. The light transmittance in stand C dominated by Quercus mongolica was highers, while that in stands A and B dominated by mixed broadleaved species was lower. The major factor limiting the growth of P. koraiensis saplings was the shading of the understory broadleaved trees with a height of 10 m. The height growth increment of the P. koraiensis saplings in stand C was significantly higher than that in stands A and B. There was a significant positive relationship (R2=0.516, P<0.01) between the currentyear height growth increment of P. koraiensis saplings and the canopy openness. It was suggested that to accelerate the positive succession of the secondary forests in eastern Liaoning Province, the canopy openness on the top of P. koraiensis saplings should be modified to more than 30%.

Key words: root characteristics, available potassium releasing from mineral, mechanism of potassiumenriched.