缙云山森林次生演替中优势种群的特性与生态因子的关联度分析

 本文用灰色系统理论的关联度分析对缙云山森林群落次生演替系列优势种群的生长、分布、显著度及其生态因子的相关性进行了尝试性研究。基本方法采取空间差异代替时间变化，利用相邻格子法每木实测取样。结果表明缙云山森林群落次生演替系列8个优势种群对应9个生态因子的关系。马尾松受限于较差的环境条件，如土层薄、坡度大等；亚热带演替顶极群落常绿阔叶林第一层树种，如大头茶、小叶栲等受控于土壤条件最大。9个生态因子对优势种群作用由强到弱的潜在序列为土壤有机质>土壤厚度>种丰富度>土壤pH>土壤水分>干扰度>海拔高度>坡度>群落透光度。8个优势种群受9个因子综合作用的反应由强到弱的可能序列是栲树>银木荷>大头茶>小叶栲>马尾松>白毛新木姜子>川山矾>光叶山矾。

ANALYSIS OF THE RELATEDNESS OF DOMINANT POPULATIONS AND ECOLOGICAL FACTORS IN THE SECONDARY SUCCESSION FOREST COMMUNINIES OF JINYUN MOUNTAIN

By analysing the relatedness degree adopted in the grey system theory, priliminary study on the relatedness of the growth of the dominant popula-tions',distribution and notability vs. the ecological factors in the secondary sere of the evergreen broadleaved forest communities in Mt. Jinyun of Sichuan was reported in this paper. After the adoption of the basic idea that the sp-atial difference can substitute for the time change,each tree in the contigu-ous grid quadrats is measured.The result reveals the relationship between the growth of eight dominant populations,distribution and notability of the sec-ondary sere of forest communities in Mt. Jinyun and the nine ecological fa-ctors.The analysis of the values of relational grades expresses that the pio-neer species,i.e. Pinus massoniana,is controlled by much weak environme-ntal conditions, and the climax species, namely,Gordonia acuminata, Casta-nopsis jargcsii, Castanopsis carlesii var. spinulosa,etc.,are mainly controlled by the conditions of the soil, such as organic matter, thickness, moisture and pH. The sequence of the latent effect of the nine environmental factors on the eight dominant populations from the strongest to the weakest is orga-nic matter content of soil>thickness of soil>richness of species> pH of soil>moisture content of soil>interference>elevation>slope gradient>transpare-nce of community. And the order of the eight dominant populations synthe-tically influenced by the nine ecological factors from the strongest to the we-akest is probably Castanopsis fargesii>Schima argentea>Gordonia acuminata>Castanopsis carletii var. spinulosa> Pinus massoniana>Neolitsea aurata var. glat4ca>Symplocos setchuanensis>Symplocos lancifolia.