Distribution Characteristics of Soluble Organic Carbon and Nitrogen in Urban Topsoil of Nanchong City
Soil soluble carbon and nitrogen play an important role in carbon and nitrogen cycle of urban ecosystem.In order to understand the distribution characteristics of soluble organic carbon and nitrogen in urban soil,this study took urban soil in Nanchong as the research object,and conducted relevant studies from multiple perspectives.The results showed that the contents of soil soluble organic carbon in surface urban soil was between 99.84 and 188.13 mg·kg-1,and the contents of soil soluble organic nitrogen was between 7.57 and 75.09 mg·kg-1,both of which decreased with soil depth.There existed significant differences in soil soluble organic carbon and nitrogen under different vegetation types,e.g.the former followed an order of evergreen forest＞herbaceous＞deciduous forest＞shrub,and the latter decreased significantly in the order of evergreen forest,deciduous forest,shrub,and herbaceous.There was a significant difference in soluble organic carbon in urban soil among the five types of green space with a decreasing order of protective green space,affiliated green space,road green space,street green space,and park green space.However,there was no significant difference in soil soluble organic nitrogen among the different types of green space.The differences in soluble organic carbon and nitrogen in the soils of green space in different urban functional areas were at extremely significant levels.The former decreased in the order of cultural and educational area,commercial area,industrial area,and residential area,while the latter followed an order of cultural and educational area＞commercial area＞residential area＞industrial area.The longer the urban soil was used,the higher the contents of soluble organic carbon and nitrogen in the soil,however,these differences were not significant through the years.The differences in soluble organic carbon and nitrogen in urban soil under different vegetation types,green space types,functional zones,and utilization years were the consequence of the interaction between the natural and human factors.
urban surface soilsoluble organic carbonsoluble organic nitrogenNanchong City
NETL
NSTL
万方数据
