[Correlation of spatial distribution and habitat factors of based on GeoDetector].

is an endemic species of Danxia landform in China. Identifying the main driving factors of its distribution can provide scientific basis for the conservation of and related habitats. With GeoDetector, we analyzed the correlation (measured by value) between the spatial distribution of and its habitat factors in Nature Reserve in Nanxiong City and the Guangdong Danxia Mountain Tourism Scenic Area (core scenic area).

[Analysis and comprehensive evaluation on cold resistance of six varieties of Michelia].

Taking six varieties of Michelia as test materials, their responses under cold situation in the field were investigated and the semilethal low temperatures were calculated by fitting Logistic equation. The nine structure indexes of leaf tissue were observed by paraffin section, and a comprehensive evaluation on cold resistance of different varieties was given according to subordinate function value analysis. The results showed that the relative electrical conductivity of six varieties of Michelia was significantly positively correlated with the semilethal low temperature (LT) of 3 h 0-25 ℃ treatment.