Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (24): 5013-5020.doi: 10.3864/j.issn.0578-1752.2011.24.006

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Characteristics of CO2 Emission and Microbial Biomass Dynamics After Adding Various Organic Materials in Red Soil

 ZHANG  Xu-Bo, XU  Ming-Gang, ZHANG  Wen-Ju, LIN  Chang-Hu, DUAN  Ying-Hua, CAI  Ze-Jiang, ZHANG  Chong-Yu   

  1. 1.贵州大学生命科学学院，贵阳 550025
    2.中国农业科学院农业资源与农业区划研究所/农业部作物营养与施肥重点开放实验室，北京 100081
    3.贵州省科学院，贵阳 550001；4贵州大学农学院，贵阳 550025
  • Received:2010-12-27 Online:2011-12-15 Published:2011-04-27

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Abstract: 【Objective】The effects of application of different organic materials on soil organic carbon mineralization and soil carbon and nitrogen fractions were studied in an experiment in lab. 【Method】 An incubation experiment was designed to study the dynamics of water soluble organic carbon (WSOC), water soluble organic nitrogen (WSON), soil microbial biomass carbon (SMBC), soil microbial biomass nitrogen (SMBN) and CO2 emission characteristics after applications of five organic materials (pig manure, cattle manure, chicken manure, maize straw and wheat straw). 【Result】 Soil CO2 emission rate increased significantly after applications of the organic materials. In general, soil CO2 emission rate firstly increased, and then (after 18-20 days) tended to be stabilized during the incubation. Potential CO2-C production derived from the first-order kinetic model was in the following pattern: wheat straw (1.51 g•kg-1)＞maize straw (1.38 g•kg-1)＞pig manure (0.89 g•kg-1)＞chicken manure (0.78 g•kg-1)＞cattle manure (0.50 g•kg-1). There were significant correlations among SMBC, SMBN, WSOC, organic materials C/N and soil CO2 emission amount. There was a significant difference in soil CO2 emission rate between the organic materials. Soil CO2 emission rate of straw was two times higher than manure. Wheat straw showed the highest emission rate, while the lowest value was found for cattle manure. Significant correlations were found between soil CO2 evolved product amount and soil microbial biomass, WSOC or organic material C/N.【Conclusion】 The C-equal organic material applications significantly enhanced soil CO2 emission rate and amount. Soil CO2 emission is closely related to soil microbial biomass, WSOC and organic material C/N. Compared with straw, manure can rapidly increase soil microbial biomass and availabilities of C and N, and therefore contributes to soil nutrient transformation and release.

Key words: red soil, organic materials, CO2 emission, C, N fractions

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