Red-stemmed Feather Moss Pleurozium Schreberi (Britt.) Mitt. – A Bioindicator of UV Radiation?
A field study was conducted in a dry pine forest at the Finnish Ultraviolet International Research Center (FUVIRC, http://fuvirc.oulu.fi/) in Sodankyl(a), Finland (67°22 N, 26°38 E). We investigated the responses of UV-absorbing compounds in the transplanted moss Pleurozium schreberi to enhanced UV radiation. The experiment lasted for a year (2003). The mosses had been transplanted in the previous fall. They were exposed to UV-BCIE radiation at 52％ above the ambient level, simulating an approximate 20％ reduction in the ozone column, under arrays of lamps filtered with cellulose diacetate, which transmitted both UV-B and UV-A radiation. The moss was also exposed to elevated UV-A radiation under control arrays of lamps filtered with Melinex polyester and to ambient radiation under arrays with no lamps in them. Simultaneously, in the same experiment, P. Schreberi growing in situ was monitored for four years, in 2002-2005 1. The results of the transplanted mosses were compared to the results of the in situ mosses. An increase of UV-absorbing compounds was found in the in situ mosses under enhanced UV-B radiation compared to the UV-A control mosses during the first year 1. Even though the treatment effect on UV-absorbing compounds was transient, the compounds correlated with the amount of UV-A and UV-B radiation under elevated UV-B treatment. The transplanted mosses showed no treatment effect. A correlation with the irradiation of the preceding days and month was found in the in situ mosses but not in the transplanted mosses 1. There were less UV-absorbing compounds in the transplanted mosses compared to the in situ mosses, which may imply that the transplanted mosses had not yet adapted to their new growing site. Our data indicate that P. Schreberi tolerates a 52 ％ increase in UV-BCIE radiation above the subarctic ambient level. The UV-B-absorbing compounds of the transplanted mosses responded to high ambient early summer levels, but the treatment differences were not significant. The in situ mosses responded during the first year of exposure by increasing their UV-absorbing compounds and after three years of exposure by acclimating to their altered radiation environment 1. Our results indicate that P. Schreberi can be used to assess the local radiation climate, but that in situ mosses are more useful than transplanted mosses.
UV-absorbing compounds in situ transplanted field study
LAPPALAINEN Niina M. HUTTUNEN Satu SUOKANERVA Hanne
Department of Biology, University of Oulu, P. O. Box 3000, FIN-90014 University of Oulu, Finland Finnish Meteorological Institute, Arctic Research Centre, T(a)htel(a)ntie 62, FIN-99600 Sodankyl(a),
国际会议
2007环境科学与技术国际会议(The 2007 International Symposium on Environmental Science and Technology)
北京
英文
2007-11-13（万方平台首次上网日期，不代表论文的发表时间）