State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.
Beijing Engineering Research Center for Watershed Environmental Restoration &Integrated Ecological Regulation, School of Environment, Beijing Normal University, Beijing, 100875, China.
Sci Rep. 2017 Feb 6;7:42032. doi: 10.1038/srep42032.
Leached cinnamon soil is the main agricultural soil distributed in the North China Plain. In this research, leached cinnamon soil samples were collected in the upper basin of Miyun Reservoir (northeast of Beijing, China). The BaPS method (Barometric Process Separation) was applied to measure nitrification, denitrification and respiration rates. The rates of nitrification, denitrification and respiration were 0-120.35 μg N/kg SDW h, 0-246.86 μg N/kg SDW h and 0.17-225.85 μg C/kg SDW h (Soil Dry Weight, SDW), respectively. The emission rates of CO and NO through nitrification, denitrification and respiration were 1.00-547.80 and 6.00-4850.65 μmol/h, respectively. The analysis of relationships between nitrification, denitrification and respiration rates indicated that these three microbial processes were interacted, which posed impacts on soil nitrogen availability. As indicated by the results, C:N ratio coupled with content could be taken as the indicators of content, which is usually the predominant form of N available to plants growing in soil. Results showed that content was the highest (i.e., >62.4 mg/kg) when C:N ratio was 5.30-8.40, meanwhile content was 3.71-4.39 mg/kg. Nevertheless, content was the lowest (i.e., <6.40 mg/kg) when C:N ratio was 9.2-12.10, meanwhile content was 3.41-4.35 mg/kg.
淋洗肉桂土是分布在华北平原的主要农业土壤。本研究在密云水库上游流域（中国北京东北部）采集了淋洗肉桂土样品。应用气压过程分离（BaPS）方法测量硝化、反硝化和呼吸速率。硝化、反硝化和呼吸的速率分别为 0-120.35μg N/kg SDW h、0-246.86μg N/kg SDW h 和 0.17-225.85μg C/kg SDW h（土壤干重，SDW）。硝化、反硝化和呼吸过程中 CO 和 NO 的排放速率分别为 1.00-547.80 和 6.00-4850.65μmol/h。硝化、反硝化和呼吸速率之间关系的分析表明，这三个微生物过程相互作用，对土壤氮素有效性产生影响。结果表明，C:N 比与含量结合可以作为含量的指标，通常是土壤中植物生长可利用氮的主要形式。结果表明，当 C:N 比为 5.30-8.40 时，含量最高（即>62.4mg/kg），同时含量为 3.71-4.39mg/kg。然而，当 C:N 比为 9.2-12.10 时，含量最低（即<6.40mg/kg），同时含量为 3.41-4.35mg/kg。
