LIU Ying1, WU Yan-you1，*, SHEN Zhi-jun2, LIU Hai2, WU Ming-kai3, QIU Yang4, HE Ru-tai4, YANG Ni4, YANG Ning4
(1. State Key Laboratory of Environment Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences , Guiyang 550002, China;
2. School of Life Sciences，Guizhou Normal University, Guiyang 550002, China;
3.Modern Chinese Medical Materials Development of Guizhou Province, Key Lab of Agricultural Biotechnology of Guizhou Province, Guizhou Academy of Agricultural Sciences , Guiyang 550006, China;
4. Fanjing Mountain National Nature Reserve Administration, Tongren 555207, China）
Abstract: Davidia involucrata, which is the only one relict species from the Tertiary in the genus Davidia, is classified as a national level to protect plants in China. The climate of the Fanjing Mountain in Guizhou Province is perennially cool and humid. Man-made forest of Davidia involucrata was the research object. The photosynthetic traits of Davidia involucrata were measured in sunny days and cloudy days, respectively, by comparing the results and analyzing the water hydrogen isotopic compositions of atmospheric precipitation, soil water, groundwater and its branches in the growth area. The results showed that the Davidia involucrata seedling was a kind of heliophyte plant with a lower transpiration rate. And it is suitable for growing in a cool environment where the temperature should not exceed 30℃. The proportion of atmospheric precipitation of Davidia involucrata in both man-made forest and natural forest were 76% and 58%, respectively. The lower proportion of deep soil water was because of the lower tension in the root caused by the lower transpiration rate. The cool, rainy, and misty environment in the Fanjing Mountain would provide a favorable condition for the growth of Davidia involucrata.
Key words: Davidia; photosynthesis; hydrogen isotope; Fanjing Mountain
EARTH AND ENVIRONMENT Vol. 42, No.6, Tot No.302, 2014, Page 726-732
