Modeling of Geographic Distribution of Malus doumeri
Specimens of Malus doumeri (Bois. ) Chev. from some herbaria, including the herbarium of Institute of Botany, Chinese Academy of Sciences (PE) , were re-identified in light of the latest taxonomic outcome of the genus Malus Mill. A total of 243 valuable distribution records were selected and digitized into the geographic coordinate data. Based on these data, the geographical distribution was mapped using DIVA-GIS. This distribution presents a pattern extending mainly from the southwest to southern and east in China, and disconnecting between Chinese Continent and Taiwan Island. It is almost consistent with the distribution of specimen records modeling with current bioclimatic data by BIOCLIM, and some potential distribution areas were found. Nineteen climate variables of the distribution points that fell in the envelope of variables of the Asia climate (spatial resolution 30 arc s) were analyzed by principal component analysis. Precipitation of wettest quarter, annual range of temperature, and precipitation of driest quarter were found to be dominant factors affecting the geographic distribution of M. doumery. Niches of dominant factors were interval only, and other niches overlapped among the varieties. The present and future potential distribution maps were predicted by BIOCLIM with current and future bioclimatic data (spatial resolution 30 arc s). Results showed that the overall distribution profile almost did not change, and it changed only in the scope and size of suitable area for each level within the entire distribution area. Based on the characteristics of ecological requirements and distribution trends of M. doumeri, the original region of M. doumeri is speculated in the borders between Yunnan, Cuangxi, Laos and Vietnam.
Malus doumeriDistribution recordsPotential distribution
NETL
NSTL
万方数据
