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应用生态学报 ›› 2000, Vol. ›› Issue (5): 641-645.

• 研究论文 •    下一篇

利用竞争指数评价水曲柳落叶松种内种间空间竞争关系

王政权, 吴巩胜, 王军邦   

  1. 东北林业大学森林资源与环境学院, 哈尔滨150040
  • 收稿日期:2000-03-06 修回日期:2000-05-11 出版日期:2000-09-25
  • 通讯作者: 王政权,男,1956年生,博士,教授,主要从事森林培育学的教学和研究工作,已发表论文40余篇.E-mail:wzqsilv@mail.nefu.edu.cn
  • 基金资助:
    国家“九五”科技攻关项目(96-011-02-01)

Application of competition index in assessing intraspecific and interspecific spatial relations between manchurian ash and dahurian larch

WANG Zhengquan, WU Gongsheng, WANG Junbang   

  1. School of Forest Resources and Environment, Northeast Forestry University, Harbin 150040
  • Received:2000-03-06 Revised:2000-05-11 Online:2000-09-25

摘要: 林木之间的竞争包括地上和地下两部分.竞争影响空间的确定对预测生长有重要的意义.本研究将竞争影响空间划分为两部分:距对象木最近的一圈,称为内圈,包括地上和地下竞争影响;除最近一圈以外称为外圈,主要为地下竞争影响.在此基础上将竞争指数分解为不同的竞争指数分量.并以水曲柳和落叶松纯林和混交林为例,定量地分析了竞争影响空间内地上竞争和地下竞争,种内和种间竞争影响大小.结果表明,纯林中两树体最近一圈内地上和地下竞争影响大于外圈的地下竞争影响.在混交林中,对水曲柳来自种内竞争影响小于种间竞争影响,对落叶松种内竞争影响明显大于种间竞争影响.此外,水曲柳以来自外圈种内的地下竞争影响为主,落叶松以来自内圈的地上和地下竞争影响为主.水曲柳与落叶松混交可明显减轻水曲柳种内的竞争压力,落叶松可保持正常生长.

Abstract: The competition among trees within a stand includes aboveground and underground parts.How to determine the zone of competition influence is important for predicting tree growth.We divide the zone into two parts: one part is defined as inside radius, the distance from nearest competitors to subject tree,in which, the competition influence is the sum of both aboveground and underground;the another part is defined as outside radius, the distance of competitors to subject tree,where the competition influence comes mostly from underground.Thus,the competition index,based upon the divided two radii,could be decomposed into different components.We used the data of manchurian ash(MA) (Fraxinus mandshurica) and dahurian larch(DL)(Larix gmelini) from pure and mixed stands to analyze the competition influence of aboveground and underground in inside and of underground in outside radius.The results show that for MA in pure stand,the competition effect was 59.06% from inside radius,and 40.94% from outside radius.For DL in pure stand,the competition effects in both radii were 71.31% and 28.69%,respectively.There was a stronger competition influence in inside than in outside radius.Underground competitions were the important issues for both species in pure stands.In a mixed stand of MA and DL,there were two species in both radii,and the effects of competition came from intraspecific and interspecific competitors.For subject tree of MA, the effect of interspecific competition was 49.55%,and that of intraspecific was 50.45%. For subject tree of DL,the effects were 81.11% and 18.89%,respectively.DL displayed a stronger interspecific competition than MA in the zone of competition influence, and was a main effect of competition on MA.For subject tree of MA, the effect of competiton from inside radius was 25.33%,which was the sum of competition influence from aboveground and underground,and about 74.67% was from outside radius.For subject tree of DL,both in inside and outside radii were 55.37% and 44.64%,respectively.Comparing with the information from both species and two radii,the root root competition from underground was an important component.DL grew well,and could reduce the impact of intraspecific competition for MA when both species mixed in a stand.