کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6536604 | 1420844 | 2018 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reducing greenhouse gas emissions while maintaining yield in the croplands of Huang-Huai-Hai Plain, China
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علم هواشناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Agroecosystems face double pressures of producing more food to feed growing global population and reducing greenhouse gas (GHG) emissions to mitigate climate change. The Huang-Huai-Hai (HHH) plain produces â¼1/3 wheat and maize of China with very high resource inputs, particularly synthetic nitrogen (N) fertilizers since the 1980â¯s. Although fertilizer input has substantially increased crop yield and enhanced biomass carbon (C) input to the soil and thus stimulating soil C sequestration, GHG emissions (e.g., nitrous oxide (N2O)) relating to the fertilizers have been also dramatically increased. Yet, a systematic regional assessment on the trade-offs between crop yield, soil C sequestration and N2O emissions as impacted by management practices and environmental conditions is lacking. Here we calibrated a farming system model to conduct comprehensive assessment on crop yield and GHG emissions (soil CO2 and N2O emissions) during the period 1981-2010 across the HHH plain at the resolution of 10â¯km. We found that soil in HHH plain was a C sink with an annual C sequestration rate of 1.53 CO2-eq haâ1 yr-1 (0-30â¯cm soil layer) during the period under current typical agricultural practices, but this sink could only offset about 68% of global warming potential from contemporary N2O emissions. By reducing the annual N input rate (from current more than 300 to â¼250â¯kgâ¯N haâ1 yrâ1) and enhancing crop residue retention rate (from current 30% to 100%), the HHH plain could act as a net sink of GHG without sacrificing grain yield. Apart from management, the effects of three key environmental factors, i.e., mean annual rainfall and temperature and initial soil organic carbon stock on dynamics of crop yield, soil CO2 and N2O emissions were also studied. The results will have important implications for the development of management strategies to maintain yield while reducing GHG emissions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agricultural and Forest Meteorology - Volumes 260â261, 15 October 2018, Pages 80-94
Journal: Agricultural and Forest Meteorology - Volumes 260â261, 15 October 2018, Pages 80-94
نویسندگان
Guocheng Wang, Zhongkui Luo, Enli Wang, Wen Zhang,