【摘要】 桃金娘是我国热带地区优良的林木种质资源，具有重要的食用、药用、生态和观赏价值。全面了解桃金娘在中国的地理分布现状，对该物种的引种与资源开发具有重要意义。为了解桃金娘在中国的地理分布格局和影响其分布的关键性气候因子，本研究通过植物标本数据库记录、文献记载及实地调查获取的地理坐标，对其水平地理分布和垂直分布进行地理分布格局分析。同时基于不同分布点的19个生物气候数据，利用主成分分析法分析了影响桃金娘地理分布的限制性因子。结果表明，桃金娘在中国水平地理分布以热带-南亚热带为主，过渡至中亚热带，东部地区的最北分布点位于浙江的平阳。桃金娘垂直分布多集中在海拔500 m以下的低山丘陵区，体现出桃金娘喜温热而不耐寒冷的特性。主成分分析的结果表明，PC1～PC3主成分的贡献率分别为41.23%、22.44%和16.34%，累计贡献率达80.02%(>75%)；因此影响桃金娘地理分布的主要信息集中在前3个主成分。主成分1表明温度是限制桃金娘往北及高海拔分布的最关键性因子，尤其是最冷季均温和极端最低温。各生物气候因子对桃金娘分布限制的重要性排序依次为：最冷季均温（Bio11）>极端最低温（Bio6）>年均温（Bio1）>最干季均温（Bio9）>年降水量（Bio12）>最湿月降水量（Bio13）>最湿季降水量（Bio16）>最暖季降水量（Bio18）。桃金娘的适宜分布区以最冷季均温为10℃和极端最低温为4℃以上的区域为佳，影响桃金娘在中国地理分布格局的关键性气候因子是1月的低温。水分因子是反映桃金娘喜欢温暖湿润的气候特点，并非是限制其地理分布的关键性因素。更多还原

【Abstract】 As an excellent forest germplasm resource in tropical areas in China, Rhodomyrtus tomentosa(Ait.) Hassk.has important edible, medicine, ecology and ornamental values. A comprehensive understanding of the current geographical distribution of R. tomentosa in China is important for the introduction and resource development of the species.To understand the geographical distribution pattern of R. tomentosa in China and the key climatic factors affecting its distribution, this study analyzed its horizontal geographical distribution and vertical distribution by using the geographical coordinates records in the plant specimen database, documented in the literature and field survey. Meanwhile,the limited factors of the geographical distribution of R. tomentosa were analyzed using principal component analysis(PCA) based on bioclimatic data from various distribution plots. The horizontal geographical distribution of R. tomentosa was mainly from tropical to southern subtropical, transitioning to the middle subtropical, with the northernmost distribution point in the eastern region located in Pingyang, Zhejiang. The vertical distribution of R. tomentosa was mostly concentrated in the low mountain hilly areas below 500 m, which reflected the features of R. tomentosa that preferred warmth and disliked coldness. The results of principal component analysis showed that the contribution of PC1–PC3 were 41.23%, 22.44% and 16.34%, respectively, and the cumulative contribution was 80.02%(>75%); therefore, the main information affecting the geographical distribution of R. tomentosa was concentrated in the first 3 principal components. The results of the PC1 showed that temperature was the most critical limiting factor of R. tomentosa for the northward distribution and at high altitudes, especially mean temperature of coldest quarter and min temperature of coldest month. The order of importance of each bioclimatic factor in limited distribution of R. tomentosa was: mean temperature of coldest quarter(Bio11) > min temperature of coldest month(Bio4) > annual mean temperature(Bio1) >mean temperature of driest quarter(Bio9) > annual precipitation(Bio12) > precipitation of wettest month(Bio13) >precipitation of wettest quarter(Bio16) > precipitation of warmest quarter(Bio18).(4) The suitable distribution area for R. tomentosa was the place where the mean temperature of coldest quarter and min temperature of coldest month were over 10℃ and 4℃, respectively. The key factor influencing the geographical distribution pattern of R. tomentosa was the low temperature condition in January, while water was not a critical limited factor in its distribution in China. The moisture factor only reflected the feature of R. tomentosa’s preference for warm and humid climate, and was not a key factor limiting its geographical distribution.更多还原