摘要
通过现代植被剖面和表土花粉分析 ,阐述了呼伦贝尔高平原 (北部 )到大兴安岭山地 (中段 )一线不同植被类型的孢粉组合特征。在草原带与森林带之间明显地存在森林草原过渡地带 ,其孢粉组合独特 ,木本植物花粉含量略高于草本 ,一般为 30 %～ 70 %。同时 ,还发现花粉含量与母体植物丰度间为非线性关系 ,校正系数 R值在特定状态下才是“常数”。植物 -花粉系统存在三种状态 :优势、混合及劣势状态 ,相应地其 R值各不相同。
According to the profile of modern vegetation and pollen analysis of surface samples,the character of sporo pollen assemblages from the steppe of Huluengbar to forest of Daxinganling mountain being investigated,indicated that,there existed a sylvosteppe zone in between the steppe and forest zones,in which the percentage of A.P.is a little more than that of N.A.P.(about 30%～70%).At the same time,a nonlinear correlation was found between the percentage of pollen and the abundance of maternal plant.There were three states in the of plant/pollen system:(1)inferior position with abundance of pollen or the maternal plant both less than 30% or 20%;(2) dominant position with both over 70% and (3) mixed pisition with both between 30%～70%.In the first state,there existed a value of Po(pollen from another place) or Vo(short of pollen,or if none at all);in the second state,the linear correlation of pollen and plant became nonlinear and only in the third state,did the correction factor (value of R) approach constant.
基金
国家自然科学基金
中国科学院湖泊沉积与环境开放研究实验室资助项目
关键词
植物-花粉系统
表土
孢粉组合
Plant and pollen system
Sylvosteppe
Value of R
Quantitaitve character
