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首页> 外文期刊>The Science of the Total Environment >Cropping systems affect paddy soil organic carbon and total nitrogen stocks (in rice-garlic and rice-fava systems) in temperate region of southern China
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Cropping systems affect paddy soil organic carbon and total nitrogen stocks (in rice-garlic and rice-fava systems) in temperate region of southern China

机译：种植系统影响了中国南部温带地区的稻田土壤有机碳和总氮储量（水稻-大蒜和水稻-耕作系统）

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摘要

The accumulation of soil organic carbon (SOC) in agricultural soils is critical to food security and climate change. However, there is still limited information on the dynamic trend of SOC sequestration following changes in cropping systems. Paddy soils, typical of temperate region of southern China, have a large potential for carbon (C) sequestration and nitrogen (N) fixation. It is of great importance to study the impacts of changes in cropping systems on stocks of SOC and total nitrogen (TN) in paddy soils. A six-year field experiment was conducted to clarify the dynamics of SOC and TN stocks in the paddy topsoil (0-20 cm) when crop rotation of rice (Oryza sativa L) -garlic (Allium sativum) (RG) was changed to rice-fava (Vicia faba L.) (RF), and to examine how the dynamics were affected by two N management strategies. The results showed that SOC stocks increased by 24.9% in the no N (control) treatment and by 18.9% in the treatment applied with conventional rate of N (CON), when RG was changed to RF. Correspondingly, TN stocks increased by 8.5% in the control but decreased by 2.6% in the CON. Compared with RG, RF was more conducive to increase the contents of soil microbial biomass C and N. Moreover, changing the cropping system from RG to RF increased the year-round N use efficiency from 21.6% to 34.4% and reduced soil N surplus in the CON treatment from 547 kg/ha to 93 kg/ha. In conclusion, changes in the cropping system from RG to RF could markedly increase SOC stocks, improve N utilization, reduce soil N surplus, and thus reduce the risk of N loss in the paddy soil. Overall, this study showed the potential of paddy agro-ecological systems to store C and maintain N stocks in the temperate regions.
机译：农业土壤中土壤有机碳（SOC）的积累对于粮食安全和气候变化至关重要。但是，关于种植系统变化后SOC隔离的动态趋势的信息仍然有限。中国南方温带地区典型的稻田土壤具有很大的固碳（C）和固氮（N）的潜力。研究耕作制度的变化对稻田土壤SOC和总氮（TN）储量的影响非常重要。进行了为期六年的田间试验，以阐明将水稻（Oryza sativa L）-大蒜（Allium sativum）（RG）的轮作改变后，水稻表层土壤（0-20 cm）中的SOC和TN储量的动态。 -fava（Vicia faba L.）（RF），并研究两种N管理策略对动力学的影响。结果表明，当RG改为RF时，无氮（对照）处理的SOC储量增加了24.9％，而以常规氮（CON）施用的处理中的SOC储量增加了18.9％。与此相对应，对照中的TN库存增加了8.5％，而CON中的库存减少了2.6％。与RG相比，RF更有利于增加土壤微生物生物量碳和氮的含量。此外，将耕作制度从RG改为RF可以使全年的氮利用效率从21.6％提高到34.4％，并减少了土壤氮的过剩。 CON处理从547公斤/公顷增加到93公斤/公顷。总之，从RG到RF的种植体系的变化可以显着增加SOC储量，提高氮的利用率，减少土壤中的氮过剩，从而减少稻田土壤中氮素流失的风险。总体而言，这项研究显示了水稻农业生态系统在温带地区储存碳和维持氮资源的潜力。

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  • 来源
    《The Science of the Total Environment》 |2017年第31期|1640-1649|共10页
  • 作者

    Tao Zhang; Anqiang Chen; Jian Liu; Hongbin Liu; Baokun Lei; Limei Zhai; Dan Zhang; Hongyuan Wang;

  • 作者单位

    Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences (CAAS), Beijing 10087, PR China;

    Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 65205, PR China;

    Department of Plant Science, Pennsylvania State University, University Park, PA 16802, USA;

    Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences (CAAS), Beijing 10087, PR China;

    Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 65205, PR China;

    Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences (CAAS), Beijing 10087, PR China;

    Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences (CAAS), Beijing 10087, PR China;

    Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences (CAAS), Beijing 10087, PR China;

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  • 正文语种 eng
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  • 关键词

    Nitrogen balance; Paddy soil; Rice-fava system; Rice-garlic system; Soil organic carbon stock; Total nitrogen stock;

    机译：氮平衡水稻土;稻谷系统米蒜系统;土壤有机碳储量;氮总量;

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