Spore Germination And Protonema Development Of Bryophytes In Hani Peatland In Response To Environmental Change

In peatland,bryophytes are the main ground-object and the most important peat-made plant.Study the regeneration of bryophytes under the global environmental change have important scientific value to population ecology and reproductive ecology of peat moss,and have practical significance to guid the ecological restoration of damaged peatland.Orthogonal design was used to set combinations of different levels of nitrogen concentrations,phosphorus concentrations,temperature and light intensity.Four species of bryophyte spores grow in Hani peatland of Changbai Mountain were cultured to observe and record spore germination and protonema development Situation in different treatment.SPSS software was used to analysis experimental results about variance analysis and multiple comparison,try to find out the respond of spore germination and protonema development of peat moss on the environmental factors change.The main conclusions are as following:1) In the experiment range,P concentration have highly significant onspore germination of Sphagnum magellanicum(P<0.01),higher P concentration can contribute to spore germination of Sphagnum magellanicum.N concentration,P concentration,temperature and light intensity have highly significant on protonema development(P<0.01).Protonema development can be promoted by higher N concentration,but when N concentration is higher than 25mg/L,the influence is small;Higher temperature can promote spore germination and protonema development of Sphagnum magellanicum,the optimum temperature is 27/20℃(day/night),it will inhibit protonema development when the tempereature exceed 33/26℃The more appropriate light intensity for spore germination of Sphagnum magellanicum is 30001ux, and higher light intensity will inhibit the protonema development.2) The affect of temperature on spore germination of Sphagnum palustre is highly significant(P<0.01),the higher temperature the higher germination rate;Spore germination of Sphagnum pa!ustre can be influenced by light intensity secondly(0.05