Grimmia and Racomitrium are two important genera of the family Grimmiaceaern(Musci,Bryophyta). To predict and compare their potential distribution regions in relation to climatic conditions in China,and thereby help their conservation and subsequent field investigations,we modeled the geographical distribution at the genus level by using a maximum entropy algorithm modeling program (MaxEnt) based on 172 presence-only data for Grimmia and 181 data for Racomitrium, as well as 19 bioclimatic variables. We found Grimmia had higher habitat suitability in Zhejiang (0. 7099, integrated habitat suitability index), Jiangsu (0. 6212),Beijing (0. 5987) Jianjin (0. 5648),Yunnan (0. 5532) ,Liaoning (0. 5515),Taiwan (0. 5422) ,Anhui (0. 5398) ,and Jilin (0. 4945),while Racomitrium had higher habitat suitability in Zhejiang (0. 889 ), Shanghai (0. 6564), Hong Kong (0. 5897 ), Taiwan ( 0. 5858 ), Guizhou ( 0. 5354 ), Hubei ( 0. 5039 ), Yunnan (0. 4885 ), Chongqing ( 0. 4871 ), Jiangsu (0. 4793) ,and Anhui (0. 4552). Comparison between the predicted distribution of Racomitrium and that of Grimmia showed that Racomitrium had higher distribution probability in Hong Kong,Chongqing, Guizhou, Guangdong, Guangxi, Hubei, Hainan, and Taiwan than Grimmia,similar distribution probability to that of Grimmia in Jiangxi,Fujian,Hunan,and lower than Grimmia in the other provinces (municipality autonomous regions). Grimmia belonged to the typical moderate geographical element,mainly in the high altitude and cold districts.%基于19个生物气候因子和紫萼藓属(Grimmia) 172个、砂藓属(Racomitrium) 181个国内分布记录,应用MaxEnt模型和ArcGis 9.3软件,定量预测了紫萼藓属与砂藓属植物在“属”水平上在我国各省区的生境适应性特点.预测结果表明,紫萼藓属植物在浙江(0.7099,综合生境适宜性指数,下同)、江苏(0.6212)、北京(0.5987)、天津(0.5648)、云南(0.5532)、辽宁(0.5515)、台湾(0.5422)、安徽(0.5398)和吉林(0.4945)有较高的气候适应性,而砂藓属植物在浙江(0.889)、上海(0.6564)、香港(0.5897)、台湾(0.5858)、贵州(0.5354)、湖北(0.5039)、云南(0.4885)、重庆(0.4871)、江苏(0.4793)和安徽(0.4552)具有较高的生境适宜性.对砂藓属与紫萼藓属的分布预测范围进行比较发现,砂藓属植物在香港、重庆、贵州、广东、广西、湖北、海南和台湾的生境适应性比紫萼藓属的总体上要高,而在江西、福建和湖南,两属的分布概率比较接近,其余省区则紫萼藓属植物的生境适宜性比砂藓的要高.紫萼藓属植物属于典型的温带性种类,其分布主要在高海拨的寒冷地段.
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