呼和浩特市土地利用方式对土壤团聚体稳定性及有机碳的影响OA

Exploring the relationship between the spatial differentiation patterns of soil aggregate stability and soil carbon sequestration in different land use patterns is of great significance for ecosystem function assessment,soil resource sustainability and land use management.We selected 0-80 cm soil layers of arable land,forest land,grassland,water area and unused land in Hohhot City as the research object,analyzed the spatial differentiation characteristics of soil aggregate stability and the relationship among the organic carbon content of aggregates in different land-use types,and then revealed the influence of land-use practices on soil aggregate stability and soil carbon sequestration capacity.The results showed that:(1)The soil in the study area was dominated by microaggregates and powdery clay particles,and there were significant differences in the stability of soil aggregates and organic carbon content between different land uses.(2)In terms of mean weight diameter(MWD)and geometric mean diameter(GMD)values,water area＞arable land＞forest land＞grassland＞unused land,and the stability of soil aggregates in unused land was the worst.(3)The pH,electrical conductivity,water content and soil bulk weight were important indicators affecting soil aggregate stability and whole-soil organic carbon content.(4)Correlation analysis showed that whole soil organic carbon content was significantly and positively correlated with soil aggregate stability.Macroaggregates can protect organic carbon more effectively.The study results will help to clarify the potential impacts of different land-use practices on soil quality and carbon cycling,and provide a scientific basis for the improvement of soil structure,the optimal management of soil carbon pools and the promotion of environmental sustainability in Hohhot City.