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北京九龙山侧柏人工林空间结构多样性

张连金1,胡艳波2,赵中华2,孙长忠1**   

  1. 1中国林业科学研究院华北林业实验中心, 北京 102300; 2中国林业科学研究院林业研究所, 国家林业局林木培育重点实验室, 北京 100091)
  • 出版日期:2015-01-10 发布日期:2015-01-10

Spatial structure diversity of platycladus orientalis plantation in Beijing Jiulong Mountain.

ZHANG Lian-jin1, HU Yan-bo2, ZHAO Zhong-hua2, SUN Chang-zhong1**   

  1. (1Forestry Experiment Center of North China, Chinese Academy of Forestry, Beijing 102300, China; 2 Research Institute of Forestry, Chinese Academy of Forestry, Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Beijing 100091, China)
  • Online:2015-01-10 Published:2015-01-10

摘要:

以北京九龙山面积为0.32 hm2样地调查数据为基础,采用传统方法及结构参数角尺度(W)、大小比数(U)和混交度(M)的二元分布法,分析了侧柏(Platycladus orientalis)人工林的空间结构多样性。结果表明:群落结构较为简单,侧柏占绝对优势,并处于低度混交、大小分化不明显且均匀分布状态,而其他伴生树种则处于高度混交与相对劣势状态;林分径级与树高结构呈单峰分布;侧柏林中平均59%的林木个体周围最近4株树均和它同种,22%林木个体周围最近4株树仅有一株其他树种,总体处于低度混交状态;侧柏样地有52%的林木呈随机分布,且处于随机分布状态的林木其周围57%都是本种,同时处于高度混交状态(M=0.75, 1.00)的林木有50%呈随机分布;不同优势度的林木有相近的概率,但优势木略多于劣势木,且大多处于低度混交和随机分布状态。侧柏人工林的空间多样性是由混交度及直径分化共同决定的,这种结果不仅与群落的发展阶段密切相关,还与群落的起源、人为干扰以及物种组成有关。
 

关键词: DNA损伤, 溴氰菊酯, 彗星试验, 真鲷, 组织损伤

Abstract: Based on survey data of a 0.32 hm2 plot in Beijing Jiulong Mountain, the spatial structure diversity of a Platycladus orientalis plantation was analyzed using traditional approaches and a bivariate distribution of three structural parameters, i.e., uniform angle index (W), dominance (U) and mingling (M). The community structure was relatively simple. The P. orientalis population was in an obviously dominant position, and in a state of low mingling, insignificant size differentiation and uniform distribution, while other accompanying species were in a state of high mingling and relative disadvantage. The diameter and height distribution of the stand presented as unimodal. 59% of individual trees in the P. orientalis forest were surrounded by the same species, and 22% were surrounded by only one other species among their nearest four neighbors, i.e., the forest was in a state of low mingling. More than half (52%) of the trees in the plot were in a random pattern, in which most trees (57%) were surrounded by the same species, while 50% of the trees in high mixture (mingling=0.75, 1.00) were randomly distributed. The trees of different extents of dominance had a similar frequency, but the number of dominant trees was slightly more than that of nondominants, and most of the dominant trees were in a state of low mingling and random pattern. The spatial diversity in the P. orientalis plantation resulted from mingling and diameter differentiation. Such a result was not only closely related to the development stage of community but also connected to its origin, anthropogenic disturbance and species composition.

Key words: deltamethrin, tissue damage, DNA damage, Pagrosomus major, comet assay