Impacts of Fertilization Alternatives and Crop Straw Incorporation on N_2O Emissions from a Spring Maize Field in Northeastern China
查看参考文献49篇
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文摘
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Spring maize is one of the most popular crops planted in northeastern China. The cropping systems involving spring maize have been maintaining high production through intensive management practices. However, the high rates of nitrogen (N) fertilizers application could have introduced a great amount of nitrous oxide (N_2O) into the atmosphere. It is crucial for sustaining the maize production systems to reduce N_2O emissions meanwhile maintaining the optimum yields by adopting alternative farming management practices. The goal of this study was to evaluate effects of alternative fertilization and crop residue management practices on N_2O emission as well as crop yield for a typical maize field in northeastern China. Field experiments were conducted during the 2010-2011 maize growing seasons (from early May to late September) in Liaoning Province, northeastern China. N_2O fluxes were measured at the field plots with six different treatments including no N fertilizer use (CK), farmers’ conventional N fertilizer application rate (FP), reduced N fertilizer rate (OPT), reduced N fertilizer rate combined with crop straw amendment (OPTS), slow-release N fertilizer (CRF), and reduced N fertilizer rate combined with nitrification inhibitor (OPT+DCD). The static chamber method combined with gas chromatography technique was employed to conduct the measurements of N_2O fluxes. The field data showed that N_2O emissions varied across the treatments. During the maize growing season in 2010, the total N_2O emissions under the treatments of CK, FP, OPT, OPTS, and CRF were 0.63, 1.11, 1.03, 1.26, and 0.98 kg N ha~(-1), respectively. The seasonal cumulative N2O emissions were 0.54, 1.07, 0.96, 1.12, and 0.84 kg N ha~(-1), respectively, under CK, FP, OPT, OPTS, and OPT+DCD in 2011. In comparison with FP, CRF or OPT+DCD reduced the N_2O emissions by 12 or 21%, respectively, while the crop yields remained unchanged. The results indicate that the reduction of N-fertilizer application rate in combination with the slow-release fertilizer type or nitrification inhibitor could effectively mitigate N_2O emissions from the tested field. The incorporation of crop residue didn’t show positive effect on mitigating N_2O emissions from the tested cropping system. The field study can provide useful information for the on-going debate on alternative N fertilization strategies and crop straw management in China. However, further studies would be needed to explore the long-term impacts of the alternative management practices on a wide range of environmental services. |
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来源
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Journal of Integrative Agriculture
,2014,13(4):881-892 【核心库】
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DOI
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10.1016/s2095-3119(13)60496-7
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关键词
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nitrogen fertilization
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straw incorporation
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nitrous oxide
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crop yield
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spring maize
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地址
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1.
CAAS-UNH Joint Laboratory for Sustainable Agro-Ecosystem Research/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Non-Point Source Pollution Control, Ministry of Agriculture, Beijing, 100081
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Institute of Plant Nutrition and Environmental Resources, Liaoning Academy of Agricultural Sciences, Shenyang, 110866
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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2095-3119 |
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学科
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社会科学总论;大气科学(气象学) |
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基金
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funded by the National Natural Science Foundation of China
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the Special Fund for Agriculture Scientific Non-Profit Research of China
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国家973计划
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the National Nonprofit Institute Research Grant of Chinese Academy of Agricultural Sciences
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文献收藏号
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CSCD:5130077
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