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Volume 38 Issue 3
Jun.  2019
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Article Navigation >  CARSOLOGICA SINICA  > 2019  >  38(3): 450-457
LAI Qianqian, YANG Lin, QIN Xinghua, TIAN Wei, WU Yanzheng, TANG Shuirong, XIE Yu, Christoph Müller, MENG Lei. Study on short-term effects of sugarcane biochar on nitrogen transformation in calcareous soils in karst farmland[J]. CARSOLOGICA SINICA, 2019, 38(3): 450-457. doi: 10.11932/karst2019y03
Citation: LAI Qianqian, YANG Lin, QIN Xinghua, TIAN Wei, WU Yanzheng, TANG Shuirong, XIE Yu, Christoph Müller, MENG Lei. Study on short-term effects of sugarcane biochar on nitrogen transformation in calcareous soils in karst farmland[J]. CARSOLOGICA SINICA, 2019, 38(3): 450-457. doi: 10.11932/karst2019y03
shu

Study on short-term effects of sugarcane biochar on nitrogen transformation in calcareous soils in karst farmland

doi: 10.11932/karst2019y03
  • 1.

    College of Tropical Agriculture and Forestry，Hainan University， Haikou,Hainan 571100，China

  • 2.

    Institute of Agricultural Environment and Soil Research，Hainan Academy of Agricultural Sciences， Haikou ,Hainan 571100，China

  • 3.

    Department of Plant Ecology,Justus-Liebig University Giessen,Heinrich-Buff-Ring 26,35392 Giessen, Germany

  • Publish Date: 2019-06-25
    Abstract
  • The effect of biochar is related to the duration of soil retention. Biochar entering the soil has an effect on nitrogen transformation process, corresponding to agronomic and environmental effects on nitrogen. The researches on the effect of biochar on nitrogen transformation of calcareous soils in karst areas of Southwest China are scarce, especially the research on various pathways of nitrogen transformation. The 15N tracing technique combined with the Markov Chain Monte Carlo（MCMC）algorithm-based numerical optimization model were used to investigate the effect of biochars on nitrogen transformation in calcareous soils, which provide theoretical basis for nitrogen transformation in this area. In this study, three treatments was designed which included biochar-1% （C1）, biochar-3% （C2） and control （CK），with biochar extracted from sugarcane for the experiment to determine the gross soil N transformation rate. The results showed that biochar could rapidly increase soil pH and organic carbon. There was no significant difference in nitrogen mineralization, immobilization and heterotrophic nitrification with the addition of biochar. but the adsorption rate of NH+4 increased with the increase of biochar. The addition of biochar also increased the NH+4 release rate, but the NH+4 release rate decreased with the increase of biochar. The autotrophic nitrification rate and dissimilation reduction rate of nitrogen can be reduced by adding masses of biochar. Therefore, the application of biochar in calcareous soil can quickly achieve NH+4 adsorption, reduce the rate of autotrophic nitrification, and reduce the accumulation of NO-3 in soil, thus reducing its loss and leaching risk.

     

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