植物区系过渡性及其生物地理意义  

Flora transitiona and its biogeographical significance

作　　者：冯建孟[1] 徐成东[2] 

机构地区：[1]大理学院生命科学与化学学院,云南大理671000 [2]楚雄师范学院化学与生命科学系,云南楚雄675000

出　　处：《生态学杂志》2009年第1期108-112,共5页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(30760040);大理学院人才引进科研启动基金资助项目(KY431040)

摘　　要：利用野外考察和文献记载资料,结合气候数据,探讨了植物区系过渡性的生物地理意义及其与年平均温度之间的联系,并将区系过渡性的生物地理意义应用于中国东部地区植被的分区。结果表明:海拔与纬度均与Ttrop/Ttemp(热带区系成分与温带区系成分所占比重之比值)呈明显的负相关关系。区系过渡性可以通过其与纬度、海拔的回归方程进行估算;当区系过渡性为恒值时,出现恒定值的海拔高度,随着纬度的升高呈单调递降格局;区系过渡性随着温度的升高,先增强后减弱,呈偏峰分布格局。通过对区系过渡性与年平均温度之间联系的抛物线方程式的分析,中国东部地区热带雨林北缘与南亚热带季风常绿阔叶林、北亚热带常绿落叶阔叶混交林与暖温带落叶阔叶林、中温带落叶阔叶针叶混交林与北温带针叶林之间的分界线分别在21.5°N以南、34°N—35°N和47.5°N以北,年平均温度分别在23.40℃、12.45℃和1.51℃。这与过去的相关研究比较一致,并为中国东部地区植物区系的变化以及植被地理分布的研究,提供了一种新的思路和方法。Based on field survey and document information, and combining with climate data, the biogeographical significance of flora transition and its correlations with climate factors were examined, and in terms of the hiogeographical significance, the vegetation regionalization in eastern China was explored. The results showed that the ratio of tropic flora component to temperate flora component （ Ttrop/Ttemp ） had significant negative correlations with altitude and latitude, and thus, the flora transition could be estimated by the regressive equation among them. When the flora transition was constant, the altitude decreased against latitude. With increasing mean annual temperature, the flora transition increased first and decreased then, representing a hump-shaped pattern. Through the analysis of the relationship between flora transition and mean annual temperature, the boundaries between tropic rain forest and southern subtropical evergreen forest, between northern subtropical evergreen-deciduous mixed forest and warm temperate deciduous for- est, and between cool temperate deciduous forest and temperate needle forest in eastern China were the south of 21.5°N and the north of 34°N-35°N and 47.5°N, with the mean annual tem- perature of 23.40℃, 12. 45 ℃, and 1.51℃, respectively, which was consistent with the previous studies. This study provided a new idea and methodology in exploring the spatial variation of flora transition and the geographical distribution of vegetation in eastern China.

关 键 词：区系过渡性 年平均温度 生物地理意义 植被分区 

分 类 号：Q948[生物学—植物学]