Study on the Effects of Climate Changes and CO_2 Concentration Increase on Forest Ecosystem

With the increased concentration of CO2 and other greenhouse gases,dramatic changes have taken place in the global climate,which affects the structure and functions of forest ecosystem. On the basis of summarizing the existing research results at home and abroad,the effects of climate changes and elevated CO2 concentration on forest ecological system,forest vegetation distribution and structure,forest productivity and the carbon and nitrogen cycle and extreme disaster events,including plant diseases and insect pests and forest fires,were discussed in this paper. At the same time,through the analysis on the mutual relationship between forest ecosystem and climate changes,the key directions and corresponding support technologies which need to be strengthened in the future were raised and prospected. This paper provides some reference and help for climate change science research and the forest ecosystem management.