Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (5): 987-994.doi: 10.3864/j.issn.0578-1752.2013.05.014

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

Effects of Biochar on Soil Organic Carbon Mineralization of Farmland

 ZHAO  Ci-Xian, CHEN  Xiang-Bi, LI  Lei, XIAO  He-You, LIU  Kun-Ping, HE  Xun-Yang, SU  Yi-Rong   

  1. 1.The Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125
    2.University of Chinese Academy of Sciences, Beijing 100049
    3.Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang 547100, Guangxi
  • Received:2012-12-15 Online:2013-03-01 Published:2013-01-31

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Abstract: 【Objective】To provide scientific reference for the rational use of the resources of organic waste, the SOC mineralization dynamics after biochar added were studied. 【Method】The paddy and upland soils with addition of different amounts of biochar (0.1%, 0.5%,1.0%, 2.0%, calculated on the dry soil) were incubated for 100 days under 25℃ and 100% air humidity. 【Result】 The change of soil organic carbon mineralization rate with time conformed the logarithmic relationship (P＜0.01). The SOC mineralization was affected significantly (P＜0.01) by soil use pattern, the added amount of biochar and their interaction. Compared with controls , the SOC mineralization in paddy soil was reduced by 2.18% and 4.62% in upland soil when 0.1% biochar was added. The response of the mineralization of SOC to the addition of biochar in upland soil was more significantly than those in paddy soil when lower amount of biochar (0.1% and 0.5%) was added. However, the opposite tendency was observed when higher amount of biochar (1.0% and 2.0%) was added. The positive priming effect of biochar on native SOC mineralization in paddy soil was higher than upland for the early stage of incubation experiment, but for later stage of incubation experiment the negative priming effect of biochar on native SOC mineralization in upland soils was more stable. 【Conclusion】The tendency of SOC mineralization remained the same after addition of biochar (0.1%-2.0%) under the condition of incubation experiment. Low added amount of biochar (0.1%) promoted the accumulation of soil organic carbon.

Key words: biochar , farmland soil , organic carbon mineralization

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