Study On Vertical Distribution Of Soil Organic Carbon And Its Fractions In Ebinur Lake Wetland

To clarify the distrubution regular of soil organic carbon, soil organic carbon fractions and the influencing factors, six typical of habitas in Ebinur Lake Wetland were choosen. The six typical habitas were Kuitun wetland,Aqikesu wetland,Shitoufangzi wetland,Jing river wetland,Ebinur lakefront wetland and Bo river wetland.The vertical distribution and its influencing factors of the soil organic carbon and its fractions were analyzed. The results showed:(1) The soil organic carbon,light fraction organic carbon(only exists in Kuitun wetland, Aqikesu wetland and 20-50cm of Ebinur lakefront wetland),dissolved organic carbon,soil microbial biomass carbon and easy oxidation state carbon of the six typical habitas in Ebinur Lake Wetland were all low. The contents were 1.08～11.49g·kg-1,0.019～0.111g·kg-1,41.6-151.3mg-kg-1,8.23～609.58mg·kg-1 and 0.06～2.38g·kg-1.The average contents were 4.73g-kg-1,0.074g·kg-1,81.0mg·kg-1,134.01mg·kg-1 and 0.70g～kg-1. The variation were 61.6%,27.3%,39.6%,100.41% and 87.9%.(2) In the whole, the content of soil organic and its fraction in Kuitun wetland was higher than others, and the Bo river wetland was the lowest of all.(3) The organic carbon reserves of the six typical habitas was 0.08 to 2.04 kg·m-2. The average soil organic carbon content was 0.74kg·m-2, and the averge variation was 66.6%. The organic carbon reserves of Kuitun wetland was the highest and the Bo river wetland was the lowest.(4) There were significant correlation between soil organic and its fractions(p<0.01). Soil moisture content,the silt content and the total nitrogen were all significantly influencing on the soil organic carbon and its fractions(p<0.01).