新物种环江黄连在我国的潜在分布区研究

Study on Potential Distribution Area of a New Species Coptis huanjiangensis in China

目的研究黄连属新物种环江黄连在我国的潜在分布区,为合理制定新物种资源保护政策、促进黄连属物种多样性稳定发展和开发利用的区域划分提供基础。方法通过资源普查和在线数据库检索,筛选出与环江黄连同属且近缘的黄连和短萼黄连的分布点。根据“同域近缘物种可能存在相似适生特点”假设,利用最大熵模型分别得到黄连和短萼黄连分布概率≥0.5的区域;利用ArcGIS软件,先获取与环江黄连采样点具有相似生态环境特征的区域,再与黄连和短萼黄连分布概率≥0.5的区域进行空间叠加。结果黄连和短萼黄连分布概率≥0.5的潜在分布区域分别归一化处理后,再空间叠加得到的区域包括四川省中部、湖南省、江西省、广西壮族自治区、福建省、浙江省及安徽省南部地区。环江黄连受降水量、温度、日照时长、土壤、地形、植被类型及寒冷指数影响下得到的潜在分布区域在广西壮族自治区北部和贵州省东南小部分地区。环江黄连的25个连续型变量经归一化处理和二值化处理后与近缘种黄连、短萼黄连分布概率≥0.5的区域分别归一化处理,叠加形成的分布区主要在广西壮族自治区与贵州省交界地带。结论环江黄连潜在分布区在广西壮族自治区与贵州省交界地带,可为黄连属物种多样性研究提供参考。

Objective To study the potential distribution area of a new species of Coptis huanjiangensis in China;To provide a basis for the rational development of new species resources protection policy,promoting the stable development of Coptidis Rhizoma species diversity and regional division of exploitation and utilization.Methods The distribution points of Coptis chinensis and Coptis chinensis var.brevisepala were identified and screened through resource census and online database.Based on the hypothesis of“the relatives in the same domain may have similar habitability characteristics”,the maximum entropy model was used to obtain the distribution probability≥0.5 of Coptis chinensis and Coptis chinensis var.brevisepala respectively.ArcGIS software was used to obtain the areas with similar ecological environment characteristics to the sampling points of Coptis huanjiangensis.The spatial superposition was carried out with the distribution probability≥0.5 of Coptis chinensis and Coptis chinensis var.brevisepala.Results The potential distribution regions of Coptis chinensis and Coptis chinensis var.brevisepala with distribution probability≥0.5 were respectively normalized and then spatially superimposed,including the central of Sichuan Province,Hunan Province,Jiangxi Province,Guangxi Zhuang Autonomous Region,Fujian Province,Zhejiang Province,and the south of Anhui Province.Influenced by precipitation,temperature,sunshine duration,soil composition,topography,vegetation types and cold index,the potential distribution area of Coptis huanjiangensis was primarily located in the northern part of Guangxi Zhuang Autonomous Region and a small portion of southeastern Guizhou Province.After normalization and binarization treatment,the 25 continuous variables of Coptis huanjiangensis were overlaid with the distribution probability≥0.5 of the related species Coptis chinensis and Coptis chinensis var.brevisepala after respectively normalization treatment,primarily lied along the border between Guangxi Zhuang Autonomous Region and Guizhou Province.Conclusion The potential distribution area of Coptis huanjiangensis is located at the border of Guangxi Zhuang Autonomous Region and Guizhou Province,which can provide references for the study of Coptids Rhizoma species diversity.