Spatial Patterns of Floristic Transition and the Biogeographical Implication in East China
  • 【摘要】

    Geographical patterns of organisms are key points in Biogeography. East China is an ideal place to explore spatial patterns of floristic transition with highly rugged mountains and great span in latit... 展开>>Geographical patterns of organisms are key points in Biogeography. East China is an ideal place to explore spatial patterns of floristic transition with highly rugged mountains and great span in latitude. This study quantitatively investigated floristic transition's correlation with altitude, latitude and mean annual temperature based on documented information of flora and climate data from 15 study sites. In addition, we tentatively defined the floristic boundaries between major vegetation types. The results indicated that the ratios of tropic to temperate flora negatively correlated both with altitudinal and latitudinal gradients. Elevation where any given floristic transition occurred decreased against latitude when floristic transition was controlled, implicating energy requirement of any given floristic transition. Both altitude and latitude significantly shaped the geographical patterns of floristic transition, and its magnitude was obtained reliably through a regression model combining altitude and latitude. Floristic transition was strengthened first, and then decreased against mean annual temperature. Floristic boundaries between such pairs of vegetation types as rain forest and southern sub-tropical evergreen forest, northern sub-tropical evergreen forest and warm temperate deciduous forest, mixed needle-broad-leaved forest and temperate needle forest were tentatively assumed as floristic transition which was completely occupied by tropical elements, deuced by tropical elements and temperate elements, and entirely took up by temperate elements, in this order. Based on correlation between floristic transition and mean annual temperature, latitudinal boundaries of such pairs of vegetation types as rain forest and southern sub-tropical evergreen forest, northern sub-tropical evergreen forest and warm temperate deciduous forest, mixed needle-broad-leaved forest and temperate needle forest, were around 22.2oN, 34.5oN and of 47.6oN, with mean annual temperature around 22.70℃, 12.66℃ and 2.62℃, respectively. It supported the previous studies, and proposed a new idea and method in probing the zonation of vegetation. 收起<<

  • 【作者】

    Chengdong XU  Jianmeng FENG 

  • 【作者单位】

    Department

  • 【会议名称】

    Conference on Environmental Pollution and Public Health (CEPPH 2010)(2010年环境污染与大众健康学术会议)

  • 【会议时间】

    2010-09-10

  • 【会议地点】

    武汉

  • 【主办单位】

    武汉大学

  • 【语种】

    chi

  • 【关键词】

    floristic transition  biogeographical implication  spatial patterns  mean annual temperature  vegetation zone  East China