Annual N_2O and CH_4 emissions from intensively managed vegetable fields in Nanjing, China(Environment)

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概要

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• Nitrous oxide (N_2O) and methane (CH_4) emissions were monitored from an intensive vegetable production region with four typical consecutive rotations and a bare fallow in Nanjing, China, from 2009 to 2010. The four consecutive rotations were established as follows: Celery (Apium graveolens dulce L.)-Tung choy (Ipomoea aquatica Forsk L.)-Baby bok choy (Brassica rapa Chinensis L.)-Amaranth (Amaranthus mangostanus L.) (C-T-Bb-A), Choy sum (Brassica rapa Chinensis L.)-Celery-Tung choy-Bok choy (Brassica rapa Chinensis L.) (Cs-C-T-Bc), Garland chrysanthemum (Chrysanthemum coronarium L.)-Tung choy-Bok choy (G-T-Bc), and Celery-Choy sum-Lettuce (Lactuca sativa L.)-Bok choy (C-Cs-L-Bc). Annual cumulative N_2O emissions were 237.7±18.3, 137.2±8.5, 100.9±7.5, 56.4±10.6 and 29.2±3.7 kg N ha^<-1> from the G-T-Bc, C-T-Bb-A, Cs-C-T-Bc, C-Cs-L-Bc rotation fields and the bare fallow, respectively. Cumulative N_2O emissions from the rotation fields, except the C-Cs-L-Bc rotation, were significantly higher than that from the bare fallow. Annual cumulative CH_4 emissions were 9.0±3.5, 13.9±1.5, 18.8±1.2, 12.1±3.8 and 16.1±3.5 kg C ha^<-1> from the bare fallow, C-T-Bb-A, Cs-C-T-Bc, G-T-Bc and C-Cs-L-Bc, respectively, and they did not show significant differences among systems. The annual N_2O emission factor averaged 2.6%, ranging from 1.2% to 5.0%, and was higher than the current IPCC default value (1.0%). Total N fertilizer application rate explained 35.5% of annual N_2O emissions. N_2O emissions from intensively managed vegetable fields were characterized by high fluxes and emission factors that varied with cropping systems. Frequent year-round monitoring of N_2O fluxes from intensively managed vegetable fields is essential for better constraint of the national N_2O budget.

• 一般社団法人日本土壌肥料学会の論文
• 2012-02-00

著者

• Yan Xiaoyuan

  State Key Laboratory Of Soil And Sustainable Agriculture Institute Of Soil Science Chinese Academy O

• JIA Junxiang

  Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University

• XIONG Zhengqin

  Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University

• XIONG Zhengqin

  Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University:State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of

• SUN Liying

  Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University

• KONG Xianwang

  Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University

• YAN Xiaoyuan

  State Key Key Laboratory of Soil and Sustainable Agriculture, Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences

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