Responses and feedbacks of lacustrine wetland to global changes
- 作者：Kong weijingZhang yuanTian ziqiang
- 会议时间：2009-11-01
- 关键词：Tempcrature increase ; Precipitation change ; Land use and land cover change ; Carbon dioxide
- 作者单位：River and Coastal Environmental Research Center, Chinese Research Academy of Environmental Sciences
- 母体文献：第十三届世界湖泊大会论文集
- 会议名称：第十三届世界湖泊大会
- 会议地点：武汉
- 主办单位：中国环境科学学会
- 语种：chi
摘要
Effects of global changes on lacustrine wetland and its feedbacks were reviewed based on published literatures.Global changes included climatic change,carbon dioxide concentration increase and land use and land cover change.And these changes can all alter the ecological processes of lacustrine ecosystems.Temperature change can influence water physical and chemical properties,and hence the biological distribution,biology survival,food web,biomass and primary productivity.Lacustrine ecosystem changed under temperature change,while it may not work on phytoplankton.Precipitation change influenced greatly on lacustrine wetlands,because it may result in wetland area decrease,biodiversity.decrease and influence the carbon cycle.The interaction of temperature increase and precipitation decrease can lead to long elemental cycle period and hence lacustrine eutrophication.Carbon dioxide concentration increase can enhance photosynthesis,restrain respiration and hence improve the primary production while it is not obvious in some lacustrine ecosystems.Methane release from lacustrine wetlands may improve as carbon dioxide concentration increase.Land use and land cover changes can import more carbon into lakes and hence resulted in more release of carbon dioxide to atmosphere.Although many researches there are still lacks in the influence of global changes on lacustrine ecosystems,e.g.response of macrophytes to global climate change,nitrogen and phosphorus biogeochemistry under global climate change,and this should be further studied.