Analysis About Carbon Storage And Influencing Factors Following With The Transformation Between Farmland And Grassland In Tongliao From Inner Mongolia

The change of lands use are the second largest carbon for greenhouse gas emissions,there is important to solve the problem of global warming for research of carbons changes law.the total areas of grassland ecosystem in the Inner Mongolia is78.8million hectares,accounting for22%of whole country,it’s ranking the first,there effects between social and ecological are the most important.The ecosystem under constant intervention by human activities,pasture and farmland reclamation activity is frequent,so make the problem of carbon release in this ecosystem become comple and changeable. This experiment aiming as the research object of newly reclaimed farmland(2years),Tillage farmland in everyear(over4years),castor farmland,soybean fields,Artificial grasslands natural grass、pasture grass(2years).Determination of carbon content of plants,photosynthesis accumulation of olant%the carbon content in soil、the rate ofsoil respiration and soils temperature、soil physical and chemical properties、the resporation rate of litter and other indicators,contrast7kinds of grounds differences of carbon fixation and carbon emission,results are follows that:1. the carbon for plant upon the ground is that:natural grass is1.89t·hm-2、reaturn grass is1.4t·hm-2、artificial turf is2.85t·hm-2、tillage farmland in everyear is6.21t·hm-2、new opend farmland is6.98t·hm-2、castor farmland is4.26t·hm-2、soybean farmland is5.34t·hm-2,4kinds of farmland was significantly higher than three grassland types;The carbon for plant under the ground is that natural grass is1.32t·hm-2,return grass is0.50t·hm-2、artificial turf is1.62t·hm-2、tillage farmland in everyear is0.30t·hm-2、new opend farmland is0.38t·hm-2、castor farmland is0.36t·hm-2、soybean cropland is0.46t·hm-2、 grasslands type is aboved for farmlands type.2. The results of soil carbon measurement is that:natural grass is19.63t·hm-2, return grass is17.74t·hm-2, artificial turf is18.84t·hm-2, tillage farmland in everyear is16.38t·hm-2, new opend farmland is13.37t·hm-2,castor farmland15.49t·hm-2,soybean farmland18.14t·hm-2;the soils carbon density for3kinds of grass types is higher than 4kinds of farmland types.the carbon density for natural grass is19.63t·hm-2,they higher than new opend farmland46.78%.this shows that the soil carbon density of farmland reclamation will significantly reduce,especially in the topsoil occurred.the soil carbon density for tillage farmland in everyear is16.38t·hm-2,the soil carbon density for return grass is17.74t·hm-2.it is shows that illustrates the pasture can helps to improve soil carbon density.3. the picture of soil respiration rate for7kinds of grounds during dates change are shows single peak curve.which the total soil respiration rate is most higher as5.23g· m-2·d-1.there was positively correlated Between temperature for soil and soil resporation rate.which the new opend farmland is most correlated for positively.from the entire growing season.the average soil respiration rate are show from7kinds of types is that new opend farmland>soybean farmland>artificial turf>natural grass>return grass>tillage farmland in everyear>castor farmland were1.98t·hm-21.93t·hm2、1.89t·hm-2、1.86t·hm-2、1.82t·hm-2、1.74t·hm-2、1.71t·hm-2. The soil bulk density in0-10cm and10-20cm for the soil resporation rate is shows significant negative correlation.4. the reaserch show-that relevance significant level for photo synthetic accumulation in stem and the organic carbon for plant for7kinds of grounds type, but root system’s relevance can’t in significant level for photosynthetic accumulation in stem and the organic carbon for plant.0-20cm soil readily oxidizable carbon content and0-40cm microorganisms can significantly reflect the dynamic change of soi organic carbon content. The soil temperature and soil bulk density and litter quantity are bean affected for carbon emission for7kinds of ground.while the soil bulk density effected soil carbon emission in the surface layer.the litter emission is contribution to soil carbon emission rate between6.24%-8.98%.