Characteristics Of Distribution Into Organic Carbon Stock In Bayanbulak Swan Lake Alpine Wetland

The background of climate warming under global scale,previous results showed that the work more and more focusing on the greenhouse emission.However,wetlands play an important role in global carbon cycling.Therefore,studies of soil carbon(C)stock,distribution and response of climate change are highly important,especially is the alpine wetland.The study located at Bayanbulak Swan Lake alpine wetland in Xinjiang province.We were using that investigation and remotely sensed data by Landsat8 in 2013,2015 and 2016,estimating organic C stock of vegetation,soil and water in this study area.Results showed that:Firstly,we were estimating that organic carbon stock by the method vegetation types of average carbon density,indicating that soil organic C density was 5.10 kg/m2 at the Bayanbulak Swan Lake alpine wetland.In addition,aboveground biomass organic C density was 0.13 kg/m2,meanwhile,the roots biomass organic C density was 2.55 kg/m2.Our results also showed that the concentration of solubility organic C was 12.78mg/L in the region.Moreover,the total organic C stock,aboveground biomass C stock,soil organic C stock,roots C stock and water C stock were 51.67×108 kg,1.12×108 kg,33.59×108 kg,16.95×108kg and0.008×108kg,respectively.The proportions of total organic C stock were 2.17%,65.02%,32.79% and0.02%,respectively.Secondly,we were building a model by NDVI and aboveground biomass,roots,soil C concentration and water C concentration.The results showed that the correlation were positive and significance between NDVI data by Landsat8 and aboveground biomass,soil organic carbon concentration on the topsoil,and the model showed that y =434.87 x +10.126 was better and the accuracy reach 80.3%.Spatial interpolation method estimating was better by roots C density,soil C concentration and water C concentration.Thirdly,we were using the model and GIS estimating C stock in Bayanbulak Swan Lake alpine wetland based on NDVI.The results showed that soil organic C density,aboveground biomass C density,roots C density and water C concentration were 4.856 kg/m2,0.140kg/m2,1.073kg/m2 and 2.299 mg/L,respectively.In addition,the total organic C stock,aboveground biomass C stock,soil organic C stock,roots C stock and water C stock were 46.17×108kg,1.06×108kg,36.94×108 kg,8.16×108kg and 115.71 kg,respectively.The proportions of total organic C stock were 2.31%,80.01% and 17.68%,respectively,the water C concentration was less and ignore.Fourthly,there were errors showed that 5.50×108kg under the two difference estimate methods.The error was higher occurs on roots organic carbon concentration,and the value was 0.477 kg/m2.However,the errors were lower occurs on aboveground biomass C density and soil organic C density,the value were0.001 kg/m2 and 0.144 kg/m2,respectively.Lastly,organic C stock was analyzed in the Bayanbulak Swan Lake alpine wetland.The results showed that vegetation on the organic C density is greater in the surrounding than the center of organic carbon density,and distribution of organic C density was patchy in the low center region.However,distribution of roots organic C density showed the center area was higher than southeast and northwest in the study areas.Moreover,the distribution characteristics of soil organic C density to the southeast of are higher than thenorthwest,and appeared a gradually decreasing trend.The view of organic C density in the study area showed the organic C density in the southeast is larger than the organic C density in the northwest region,and the trend of decreasing gradient.