Net annual global warming potential and greenhouse gas intensity in Chinese double rice-cropping.pdf

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Received: 17 Aug 2010 Revised: 30 Oct 2010 Accepted: 16 Nov 2010 Running title: Long-term fertilizer effects on GWP and GHGI Net annual global warming potential and greenhouse gas intensity in Chinese double rice-cropping systems: a 3-year field measurement in long-term fertilizer experiments QINGYIN SHANG$, XIUXIA YANG$, CUIMIN GAO$, PINGPING WU, JINJIAN LIU, YANGCHUN XU, QIRONG SHEN, JIANWEN ZOU* and SHIWEI GUO* College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China $These authors contributed equally to this paper. *Corresponding authors. Tel.: +86 25 8439 6393 Fax: +86 25 8439 6286 E-mail: jwzou21@njau.edu.cn (J. Zou) sguo@njau.edu.cn (S. Guo) This is an Accepted Article that has been peer-reviewed and approved for publication in the Global Change Biology, but has yet to undergo copy-editing and proof correction. Please cite this article as an “Accepted Article”; doi: 10.1111/j.1365-2486.2010.02374.x 1 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Keywords: carbon dioxide, methane, GHGI, GWP, long-term fertilizer experiment, nitrous oxide, rice paddy, soil organic carbon To be submitted to Global Change Biology (Accepted version, manuscript ID GCB-10-0680R1) Abstract The impact of agricultural management on global warming potential (GWP) and greenhouse gas intensity (GHGI) is not well documented. A long-term fertilizer experiment in Chinese double rice-cropping systems initiated in 1990 was used in this study to gain an insight into a complete greenhouse gas accounting of GWP and GHGI. The six fertilizer treatments included inorganic fertilizer [nitrogen and phosphorus fertilizer (NP), nitrogen and potassium fertilizer (NK), and balanced inorganic fertilizer (NPK)], combined inorganic/organic fertilizers at full and