Soil Organic Carbon And Nitrogen Storage And The Dynamic Changes In Hilly Area Of Central Sichuan Basin

Along with the research of global changes,the research of the soil carbon cycle receives people's universal attention。This article take the Sichuan Yanting County as an example,and studies the farmland soil carbon nitrogen reserves and the dynamic change in hilly Area of Central Sichuan Basin in nearly 23 yesrs。Rested on the second general detailed soil survey material data in Yanting County in 1984 and the open country soil sampled data in 2007, through methods of field sampling, the experiment analysising and model calculation,this article estimated and analyzed soil organic carbon density dynamic change in this County, improved measures for improving soil the carbon storage。Research results show that the soil organic carbon density increased slightly overall, with a weak carbon sink effect in nearly 23 years。The change between different soil types is larger, And in terms of land use,soil carbon density of the county's rice fields increased slightly, while dry soil carbon density decreased slightly。The average total nitrogen content of the soil surface large upward trend,but various types of soil different dynamic changes in trends Yanting County nearly 20 years。Rice soil decreased, Chao soil,purple soil,yellow soil showed an upward trend,and the rising trend more apparent。The past 20 years Yanting County surface soil carbon and nitrogen than the overall upward trend, the rate of soil types change little difference。Yellow soil surface of the carbon and nitrogen increased more than the other types of surface soil carbon and nitrogen than the smaller increase。 Complex and diverse farmland ecosystem and land-use,the complex and volatile of the impact of human activities manner and the strength in hilly Area of Central Sichuan Basin,make soil carbon cycle of farmland ecosystem extremely complex。In future work,we shoud strengthen dynamic monitoring and analysis of soil organic carbon (soc)pools of farmland ecosystems in the area and nitrogen storage content of the dynamic monitoring and analysis of land use on further revealed agro-ecosystem of soil carbon and soil carbon and nitrogen than the impact。To improve soil organic carbon reserves,a series of measures should be taked in Yanting County in the future,such as improved farming systems,Promotion of eco-agricultural technology,Increased soil organic matter restitution;Further strengthen the construction of the ecological environment and prevent soil erosion through the construction of irrigation projects,to further stabilize and expand the area of paddy fields,improving fertilizer,cultivate good crop varieties by organic fertilizer,such as promotion of straw。...