[Effects of enhanced UV-B radiation on the growth of five bryophytes in Changbai Mountains].
Five bryophytes (Rhytidium rugosum, Rhytidiadelphus triquetrus, Hylocomium splendens, Hylocomium pyrenaicum, and Polytrichum alpinum) were exposed to 0.2 kJ x m(-2) x d(-1) (visible light under native condition, CK), 3.0 kJ x m(-2) x d(-1) (simulated dose of UV-B irradiance at the tundra in Changbai Mountains, medium dose of UV-B irradiance, T1), and 6.0 kJ x m(-2) x d(-1) (high dose of UV-B irradiance, T2) to investigate the effects of enhanced UV-B radiation on plant height, biomass, and chlorophyll content. The results indicated that medium and high UV-B radiations decreased the plant height, biomass, and chlorophyll content of R. triquetrus and H. splendens by 32.3%, 62.4%, and 81.3%, and 21.4%, 59.4%, and 62.8%, respectively, and the relative growth rates were negative. Enhanced UV-B radiations had less effect on P. alpinum chlorophyll content but doubled its below-ground biomass, and slightly increased the biomass of R. rugosum. P. alpinum and R. rugosum had higher tolerance against UV-B radiation, while R. triquetrus and H. splendens were more sensitive to UV-B radiation.
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. yuhuanwu@iae.ac.cn
Yu-Huan
YH
Wu
Yan-Hong
YH
Gu
Peng
P
Liu
Tuba
T
Zoltán
D000531:Altitude; D018533:Biomass; D044002:Bryophyta / Q000145:classification / Q000254:growth & development* / Q000528:radiation effects*; D002681:China; D004784:Environmental Monitoring / Q000379:methods; D013045:Species Specificity; D014466:Ultraviolet Rays