JOURNAL OF NATURAL RESOURCES ›› 2007, Vol. 22 ›› Issue (6): 936-945.doi: 10.11849/zrzyxb.2007.06.010

• Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS • Previous Articles     Next Articles

Distribution Characteristics of Soil Organic Carbon and Microbial Biomass Carbon on the Loess Plateau

DANG Ya-ai1,3, LI Shi-qing1,2, WANG Guo-dong3, SHAO Ming-an2   

  1. 1. State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China;
    2. Institute of Soil and Water Conservation, CAS, Yangling 712100, China;
    3. College of Science, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China
  • Received:2007-03-19 Revised:2007-06-01 Online:2007-12-25 Published:2007-12-25

Abstract: The soil organic carbon(SOC),soil microbial biomass carbon(Mc) and their relationship of the following soils on the Loess Plateau i.e.,Ust-Sandiic Entisols(Shenmu),Los-Orthic-Entisol(Yan'an) and Eum-Orthic Anthrosol(Yangling) were investigated to assess the impacts of location and soil depth(0-200cm) on the contents and to cumulate the first dates to comprehend the soil C on the Loess Plateau.The result showed that the contents of SOC and Mc were different under different soil types and soil depth.In the same location,the contents of SOC and Mc in the profiles decreased remarkably within 0-60cm,decreased slightly within 60-120cm and remained low and stable under 120cm.From south to north on the Loess Plateau,the contents of SOC,Mc and soil organic carbon storage decreased significantly.Within 0-200cm soil depth,the soil organic carbon storage is 102.23±30.12t/hm2,67.78±9.23t/hm2 and 27.07±4.15t/hm2 in Eum-Orthic Anthrosol,Los-Orthic-Entisol and Ust-Sandiic Entisols respectively.The soil organic carbon storage in 100-200cm of the above three types of soil were 65%,74% and 58% of carbon storage in 0-100cm respectively.Soil organic carbon storage in soil depth was important to assess the storage of organic carbon on the Loess Plateau.Mc was significantly related with SOC(P<0.01).The range of Mc/SOC ratio was 0.005-0.05.Though the use of land was closely related with the contents of SOC and soil C/N in Ust-Sandiic Entisols and Eum-Orthic Anthrosol,there was close relationship with the contents of Mc and Mc/SOC(P>0.05) in the three types of soil.The contents of Mc and Mc/SOC in grassland soil increased slightly compared with that of farmland.

Key words: soil, soil microbial biomass carbon, profile distribution, the Loess Plateau

CLC Number: 

  • S153.6+1