Differences of Soil Organic Carbon Components in Different Grassland Types of Qilian Mountain
In order to determine the composition and stability of soil organic carbon pool in alpine areas,different grassland types(alpine meadow,alpine steppe and alpine swamp meadow)in Qilian Mountain area were selected as the research objects,the heavy and light components in 0-50 cm soil were separated and extracted by layer,and the contents of heavy fraction organic carbon(HFOC)and light fraction organic carbon(LFOC)were determined and analyzed.The results show that the effects of different grassland types on the content and distribution of soil HFOC and LFOC were different,the contents of HFOC and LFOC had obvious vertical changes among soil layers,show the trend of high and low,and there were obvious differences among different regions.The order of LFOC content in different grassland types is alpine swamp meadow>alpine steppe>alpine meadow,The order of soil organic carbon pool stability in different grassland types is alpine meadow>alpine steppe>alpine swamp meadow.Soil pH,moisture content,TC,SOC,TN content and C/N value were significantly correlated with soil HFOC and LFOC content(p<0.01).In summary,the composition and stability of soil organic carbon pool in Qilian grassland ecosystem were affected by grassland types,soil physical and chemical properties and environmental variables.
alpine areagrassland typeheavy fraction organic carbonlight fraction organic carbonsoil physical and chemical propertiesenvironmental geology
NETL
NSTL
万方数据
