Greenhouse gas emissions broken the balance of the carbon budget in global biogeochemical cycles.Forest ecosystems plays a great important role in maintaining the carbon-oxygen biosphere balances by absorbing CO2.Quantifiable forest carbon sinks has become hot spot in worldwide research.As species of high economic value,Phyllostachys violascens was widely planted in south of Yangtze River with an expanding planting area.Due to shorter growing season and efficient operations,bamboo forestcould not olny brings significant economic benefit but also has a meaningful impact on climate change and forest carbon sinks.Under a special style management as well as its own eco-physiological processes,Phyllostachys violascens has both characteristic of forest and farmland system.Comparing other types of forest,Phyllostachys violascens had a greater annual photosynthesis intensity,a shorter cuttingcycle,masses of planting area and consideralbe potential capacity of the carbon sink. But about bamboo flux process and solid carbon ability reported in the literature at home and abroad is very few,enhancing the research is highly requirement.In subtropical regions to establish long-term continuous observation of the flux tower,to reveal bamboo carbon source and sink process and the mechanism which influence carbon balance has profound significance for regional scale characteristics of ecosystem carbon balance research and it have inspired guiding role.In the Zhejiang,linan city establishedbamboo forest flux observation tower,pick up three dimensional ultrasonic anemometer,H2O/CO2 infrared analyzer,and multi-layer gradient of the temperature and humidity,wind speed,the radiation of the conventional meteorological instruments,from September 2010 observation so far.In a year of observation data basis,through coordinate rotation correction data,through the threshold to eliminate quality control,the application of average daily variation method(MDV)plug fill a gap of data,and related calculation and analysis. Annual carbon fluxes from high-efficiency management of bamboo forest were measured using eddy covariance technology.The observation were to investigate the variation of CO2 fluxes on seasonal scale,analyze the relationship between carbon budget and related environmental factors.Results showed that annual carbon budget of bamboo forest ecosystem was a carbon sink.Carbon sequestration capacity of bamboo forest was less than that of Phyllostachys heterocycla,Cunninghamialanceolata,paddy fields and farmland in northern China.The research indicated: annual NEE(Net Ecosystem Exchange,NEE)(126.303 gC · m-2 · a-1),RE(Ecosystem Respiration,RE)(1108.845 gC · m-2 · a-1)and GEP(Gross Ecosystem Exchange,GEE)(1235.15 gC · m-2 · a-1).Except covered in winter(December-February),carbon budget for other months was carbon source.Carbon sequestration peaked in November,then in June.It showed a double-peak curve.Carbon emissions peaked in January.The diurnal variation of bamboo forest carbon flux was significantly changing with seasonal pattern.With mean annual value of 11%,the annual carbon sequestration efficiency was highest in November(33%) and was negative from December to February.Ecosystem respiration peaked in summer,which would be increasing along with the higher soil temperature by straw mulching in winter.Annual RE has an exponential relationship with temperature.In winter,temperature in plantations was a major factor in CO2 fluxes variation.Meanwhile a large number of organic mulch leaded to an increasing carbon emission.