Content and density of soil organic carbon under different land use types in Shenzhen

The change of soil carbon pool has a significant impact on the global greenhouse effect and carbon cycle.Urban soil is an important part of the global carbon cycle.The impact of urbanization on soil organic carbon pool needs to be examined.Based on the field investigation and samples in Shenzhen City,soil organic carbon content,density and distribution were analyzed.The soil depth of samples from different land use types were 0～10,11～20 and 21～30 cm.The results are as follows.(1) The average soil organic carbon content was 0.72～40.52 g·kg~(-1),and average soil organic carbon density was 0.27～13.36 kg·m~(-2) in the soil depth of 0～30 cm.(2) The soil organic carbon content and density decreased with the increase of soil depth.In the soil depth of 0～10 cm,the average soil organic carbon content ranged between 1.56 to 71.88 g·kg~(-1),and the average organic carbon density ranged between 0.18 to 7.05 kg·m.~(-2)In the soil depth of 11～20 cm,the average soil organic carbon content ranged between 0.59 to 36.79 g·kg~(-1),and the average organic carbon density ranged between 0.09 to 4.5 kg·m~(-2).In the soil depth of 21～30 cm,the average soil organic carbon content ranged between 0 to 12.90 g·kg~(-1),and the average organic carbon density ranged between 0 to 1.78 kg·m~(-2).(3) The soil organic carbon content and density in forest land decreased with increasing altitude,and those in urban construction land and unused land were very low.(4) The land use change could affect the storage and distribution of soil organic carbon.