Resources Science ›› 2017, Vol. 39 ›› Issue (1): 105-115.doi: 10.18402/resci.2017.01.11

• Orignal Article • Previous Articles     Next Articles

Effects of fertilization on greenhouse gas emissions in paddy fields in the Middle and Lower Reaches of Yangtze River based on Meta-analysis

ZHU Liqun1, 3, WANG Chunjie2, YANG Manjun2, LI Jing3, CHEN Ligen3   

  1. 1. College of Rural Development,Nanjing Agricultural University,Nanjing 210095,China;
    2. College of Economics and Management,Nanjing Agricultural University,Nanjing 210095,China;
    3. College of Public Administration,Nanjing Agricultural University,Nanjing 210095,China
  • Received:2016-08-01 Revised:2016-11-24 Online:2017-01-20 Published:2017-01-20

Abstract: Agricultural greenhouse emissions are an important source of emissions responsible for climate warming. To comprehensively evaluate the effect of fertilization management (Inorganic nitrogen fertilization(N),Inorganic nitrogen,phosphorus and potassium fertilization (NPK),Inorganic and organic fertilization(OF))on greenhouse emissions,net emission reduction potential and greenhouse gas intensity we used 40 documents on greenhouse gas emissions in paddy fields in the Middle and Lower Reaches of Yangtze River and 339 sets of data. A meta-analysis was conducted to determine the effects of the three fertilization modes on CH4 and N2O emissions,fertilization times and fertilization application. The results showed that the effects sizes of N,NPK and OF on annual CH4 emissions were 0.24,0.27 and 0.63,respectively. While the effect sizes of N,NPK and OF on annual N2O emissions were 1.25,1.26 and 1.41,respectively. The effect sizes of N,NPK and OF on CH4 and N2O emissions increased with increasing fertilization time. The effects size of OF on CH4 and N2O emissions showed an increase and then decrease with increasing fertilization;the N and NPK showed an increasing and decreasing tread respectively. In addition,the net warming potential of fertilization was OF > NPK > N,and CH4 emissions were a large proportion of greenhouse gas emissions. The greenhouse gas intensity was OF > NPK > N. From the point of view of higher yields and greenhouse gas emission reduction,NPK is more appropriate than the other two fertilization modes in the Middle and Lower Reaches of Yangtze River.

Key words: fertilization, greenhouse, Meta-analysis, Middle and Lower Reaches of Yangtze River, net warming potential