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[1]LI Yu-jin,WANG Bai-qun,DING Ting-ting.Profile Distribution Characteristics of Microbial Biomass Carbon and Particulate Organic Carbon of Farmland Soil in East Gansu Province of Loess Plateau[J].Research of Soil and Water Conservation,2013,20(06):1-5.

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Profile Distribution Characteristics of Microbial Biomass Carbon and Particulate Organic Carbon of Farmland Soil in East Gansu Province of Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 20 Number of periods: 2013 06 Page number: 1-5 Column: Public date: 2013-12-28

Title:: Profile Distribution Characteristics of Microbial Biomass Carbon and Particulate Organic Carbon of Farmland Soil in East Gansu Province of Loess Plateau

Author(s):: LI Yu-jin¹, WANG Bai-qun^1,2,3, DING Ting-ting²; 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China

Keywords:: Loess Plateau; dark loessial soil; microbial biomass carbon; particulate organic carbon; distribution characteristics

CLC:: S153.6⁺2

DOI:: -

Abstract:: Combining field sampling with laboratory analysis, we studied the soil profile distribution of microbial biomass carbon (MBC) and particulate organic carbon (POC) of dark loessial soil in farmland in East Gansu Province of Loess Plateau. The results showed that the contents of MBC and contents of POC were significantly different with the soil layer changes， which mainly distributed in 0—20 cm and 20—40 cm soil layers, mostly distributed in the top soil layer. The contents of MBC decreased with the soil depth increase in 0—60 cm soil layer. With the altitude increase, the contents of MBC had the relative increase tendency in 0—20 cm soil layer with the range of 180.92～282.53 mg/kg. The contents of POC were in the range of 1.02～1.68 g/kg and 0.25～0.96 g/kg in the of 0—20 cm and 20—40 cm soil layers, respectively, which were lower below 40 cm soil layer than those in the upper layers; with respect to the proportion MBC and POC to soil organic carbon(SOC), the percentages of MBC/SOC and POC/SOC in the 0—20 cm and 20—40 cm soil layesr were significantly higher than the others, MBC/SOC varied from 2.29% to 3.70% and 1.00% to 2.11%, respectively, POC/SOC varied from 13.46%～19.13% and 5.08%～16.16% in these two layers, respectively. With the soil layer increase, the trends of MBC/SOC and POC/SOC were consistent with that of MBC and POC. MBC/SOC and POC/SOC can be served as indexes to reflect the soil quality changes along profile.

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