The Study Of Soil Carbon Pool And Its Stability In Swan Lake Alpine Wetland Measures

Carbon pool dynamic is the hot topic in the Wetland study in the world, currently the carbonsequestration potential of wetland is still unclear in the arctic-alpine area. In order to determine itscomposition of soil organic carbon pool and influence of water condition, degradation degree, grasslandtypes and fencing, the swan lake wetland was choosed as the research area. The results indicate that:Firstly, the order of soil total carbon and soil total nitrogen in different water condition is the surfacehydrops region(266.54g·kg^-1)＞Seasonally watered region(195.74g·kg^-1)＞Perennial dry area(52.92g·kg^-1); and soil total nitrogen in descending order is：the surface hydrops region(21.81g·kg^-1)＞Seasonally watered region(17.12g·kg^-1)＞dry area(8.98g·kg^-1). The order of soil carbon content is thesurface hydrops region(230.74g·kg^-1)＞Seasonally watered region(185.96g·kg^-1)＞Perennial dry area(53.55g·kg^-1).Soil microbial biomass carbon content in descending order is: the surface hydrops region(1138.00mg·kg^-1)＞Seasonally watered region(872.00mg·kg^-1)＞dry area(256.22mg·kg^-1). SoilDOC’s order is the surface hydrops region(19.14g·kg^-1)＞Seasonally watered region(16.97g·kg^-1)＞dry area(0.77g·kg^-1).Secondly, outside of the fence, soil organic carbon content in the surface of alpine meadows was thegreatest:165.29g·kg^-1, followed by alpine meadows grassland and then alpine grassland with98.37g·kg^-1and83.54g·kg^-1, respectively; soil organic carbon content increased by11.37%、3.26%and2.21%,respectively after fencing. The fencing significantly enhanceed the soil organic carbon content in alpinemeadows and alpine grassland.Both inside and outside of the fence, the soil organic carbon contentdecreased with the increasing of soil depth. Outside of the fence, soil organic carbon content in the surfaceof alpine meadows grassland was the greatest with181.7mg·kg^-1, followed by alpine meadows and alpinegrassland, which were146.37mg·kg^-1and43.06mg·kg^-1, and increased by2.89%and12.04%afterfencing, respectively.the content of microbial carbon intside of fence was greater than outside of the fencein alpine grassland, which were43.06mg·kg^-1and25.68mg·kg^-1, respectively. With the soil depthincreased, microbial carbon content and Microbial entropy were decreaseed both of inside and outside the fence. The organic carbon and microbial carbon showed significantly difference （P<0.05） among differentgrasslands, and microbial carbon and soil rapidly-available potassium is significantly differen（tP<0.01）,butthe difference of alkali solution nitrogen is not significant.Thirdly, soil total carbon and soil total nitrogen in descending order is: the slight degradation(124.17g·kg^-1)＞medium degradation(46.44g·kg^-1)＞serious degradation(41.86g·kg^-1); and soil total nitrogenin descending order is：the slihgt degradation(11.83g·kg^-1)＞medium degradation(7.46g·kg^-1)＞seriousdegradation(4.52g·kg^-1). Soil carbon content in descending order is: the slight degradation(51.88±0.51g·kg^-1)＞medium degradation(46.44g·kg^-1)＞serius degradation(3.55g·kg^-1).Soil microbial biomasscarbon content in descending order is: the slight degradation(1255.11mg·kg^-1)＞medium degradation(256.22mg·kg^-1)＞serious degradation(21.42mg·kg^-1). Soil DOC content in descending order is: theslihgt degradation(11.23g·kg^-1)＞medium degradation(8.82g·kg^-1)＞serious degradation(0.77g·kg^-1).Finally，The carbon stability in descending order is: the surface hydrops region（0.49）＞dry area（0.36）＞Seasonally watered region（0.2）. The carbon stability in descending order is:slight degradation（1.93）＞the medium degradation（1.42）＞serious degradation（0.68）.