土地利用方式对内蒙古典型草地生态系统碳氮固持的影响(英文)

编号 zgly0001585847

文献类型 期刊论文

文献题名 土地利用方式对内蒙古典型草地生态系统碳氮固持的影响(英文)

作者 何念鹏  张云海  代景忠  韩兴国  宝音陶格涛  于贵瑞 

作者单位 KeyLaboratoryofEcosystemNetworkObservationandModeling  InstituteofGeographicSciencesandNaturalResourcesResearch  CAS  Beijing100101  China  StateKeyLaboratoryofVegetationandEnvironmentalChange  InstituteofBotany  CAS  Beijing100093  China 

母体文献 Journal of Geographical Sciences 

年卷期 2012年05期

年份 2012 

分类号 S812 

关键词 carbon  grazing  land-use  nitrogen  reclamation  soilfractions 

文摘内容 To explore the optimal land-use for soil carbon(C) sequestration in Inner Mongolian grasslands,we investigated C and nitrogen(N) storage in soil and soil fractions in 8 floristically and topographically similar sites which subjected to different land-use types(free-grazing,grazing exclusion,mowing,winter grazing,and reclamation).Compared with free-grazing grasslands,C and N storage in the 0-50 cm layer increased by 18.3%(15.5 Mg C ha-1) and 9.3%(0.8 Mg N ha-1) after 10-yr of grazing exclusion,respectively,and 21.9%(18.5 Mg C ha-1) and 11.5%(0.9 Mg N ha-1) after 30-yr grazing exclusion,respectively.Similarly,soil C and N storage increased by 15.3%(12.9 Mg C ha-1) and 10.2%(0.8 Mg N ha-1) after 10-yr mowing,respectively,and 19.2%(16.2 Mg C ha-1) and 7.1%(0.6 Mg N ha-1) after 26-yr mowing,respectively.In contrast,soil C and N storage declined by 10.6%(9.0 Mg C ha-1) and 11.4%(0.9 Mg N ha-1) after 49-yr reclamation,respectively.Moreover,increases in C and N storage mainly occurred in sand and silt fractions in the 0-10 cm soil layer with grazing exclusion and mowing.Our findings provided evidence that Inner Mongolian grasslands have the capacity to sequester C and N in soil with improved management practices,which were in the order:grazing exclusion > mowing > winter grazing > reclamation.