摘要
种群格局信息维数能够刻划格局强度的尺度变化程度 ,揭示出种群个体分布的非均匀性状况。采用信息维数对大兴安岭兴安落叶松种群格局的研究显示 ,各类兴安落叶松林中兴安落叶松种群格局的信息维数大小依次为越桔 -兴安落叶松林 ( 1 .4 80 ) >杜香 -兴安落叶松林 ( 1 .3 73 ) >杜鹃 -兴安落叶松林 ( 1 .3 2 1 ) >草类 -兴安落叶松林 ( 1 .0 93 )。虽为群落建群种 ,兴安落叶松种群格局的信息维数较低 ( <1 .5,远离 2 ) ,格局强度尺度变化程度较低 ,个体分布比较均匀。兴安落叶松 -白桦林中兴安落叶松种群处于劣势伴生地位 ,种群格局的信息维数更低 ( 1 .0 65) ,格局强度的尺度变化更加微弱 ,种群个体以星散分布为主。对以上几类森林类型的比较分析显示 ,格局强度尺度变化程度由高至低的次序为兴安落叶松天然林 ( 1 .3 1 7) >兴安落叶松 -白桦林 ( 1 .0 65) >兴安落叶松人工林 ( 0 .74 5)。
The information dimension of population patterns quantifies the scale variation degree of pattern intensity,and discloses the unevenness of individual distribution.The spatial pattern of Larix gmelini population in Daxing′an Mountains,China was studied by using information dimension.The results showed that,the order of information dimensions of different Larix forests was Vaccinium Larix forest(1.480)> Ledum Larix forest (1.373)> Rhododendron Larix forest (1.321)> Grass Larix forest (1.093).Since Larix gmelini population was the dominant species in these communities and the individuals were evenly distributed in space,information dimensions of population patterns were low (<1.5,far from 2) and the scale variation degree of pattern intensities were also low. Larix gmelini was in an accompaniment position in Larix Betula forests and the individuals were scattered in space,so information dimension of the population pattern was lower (1.065) and the scale variation degree of pattern intensity was also lower.Comparisons among the above forest types showed that,the order of the scale variation degree of pattern intensities was natural Larix forest (1.371)> Larix Betula forest(1.065)> Larix plantation (0.745).The variation of information dimension reflects the differences of population regeneration conditions in different forest types.
出处
《生态学报》
CAS
CSCD
北大核心
2000年第2期187-192,共6页
Acta Ecologica Sinica
基金
国家自然科学基金!资助项目 ( 3 94 70 1 2 9)
关键词
兴安落叶松
种群格局
信息维数
分形特征
Larix gmelini, population pattern,information dimension,pattern intensity,scaling
