WANG Cheng–Yuan1, 2, WANG Shi–Jie1, RONG Li3
(1. The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
2. Graduate University of the Chinese Academy of Sciences, Beijing 100039, China;
3. School of Geography and Biology Sciences, Guizhou Normal University, Guiyang 550001, China)
Abstract: The calcareous soil in the karst area has such characteristics as high calcium concentrations and low phosphorus concentrations, which restricted the existence of some species. In order to study why calcifuges cannot exist in calcareous soil, a calcifuge, Diplazium pinfaense, was cultivated by nutrient solutions with different calcium concentrations and phosphorous concentrations. And their chlorophyll fluorescence characteristics were studied. Meanwhile, Cyrtogonellum fraxinellum, an exclusive calciphyte was used as a contrast. The results displayed that there were significant differences in chlorophyll fluorescence characteristics between Diplazium pinfaense and Cyrtogonellum fraxinellum, when under the control of Ca2+ concentrations, but there was no difference in low H2PO4– concentration stress. The effects of Ca2+ concentrations were more negative than those of H2PO4– concentrations, and the discrepancies of effects were up to activity level. The high Ca2+ concentrations could make the values of Diplazium pinfaense chlorophyll fluorescence parameters (Fo ,Fv'/Fm', Fv/Fm, ETR, qP, NPQ ,P) decrease remarkably. It is proposed that the high Ca2+ concentrations in calcareous soil could restrain the abilities to catch and transform the light which will be used in photochemical reaction, thereby it could affect the existence of Diplazium pinfaense in calcareous soil.
Key words: calcareous soil; Diplazium pinfaense; chlorophyll fluorescence; calcifuge
EARTH AND ENVIRONMENT Vol. 40, No.1, Tot No.287, 2012, Page 23-29
