The Influences Of Hydrothermal Conditions On The Flora Distribution Of Constructive Species Of Chinese Vegetation

This paper takes China as the study area. Through analyses of data about genera of plants, distribution patterns and climate factors, and the uses of ArcGIS and Matlab software, influences on15distribution patterns and234genera of constructive plants by hydrothermal conditions were discussed, and their corresponding climate thresholds were calculated.The results are summarized as follows:(1) The flora of distribution patterns is closely related to climatic factors, which reflects the homoplasy to climate factors in the origin, expansion and evolution of patterns. The reaction from distribution patterns is quite sensitive to heat factor and moisture factor, insensitive to hydrothermal conditions.(2) The relation between15distribution patterns and234genera of constructive plants by hydrothermal conditions was analyzed, and the origin, migration routes and distribution centers on cultivated plants were discussed.(3) Cultivated plants are included in the distribution patterns, but some of the ecological plasticity of the plant may cause some interference to the flora.(4) Based on climatic zones and distribution patterns, the Medit. E. Asia, N. Z. and Mexico-Chile disjuncted distribution was leaned towards temperate type, East Asia and North America disjuncted elements, East Asia elements, and endemic to China elements towards intertropical and semi-tropical type,while other distribution patterns were divided reasonably.The study of flora involves the plant origin, evolution, distribution and relationship with the changes of Earth's history. This paper established the link between hydrothermal conditions and flora of constructive species on a large scale, which is important to the exploration of flora evolution in the context of global changes and the protection of plant resources.