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Nutrient Cycling in Agroecosystems

, Volume 98, Issue 1, pp 15–26 | Cite as

Greenhouse gas intensity and net annual global warming potential of cotton cropping systems in an extremely arid region

  • Jinling Lv
  • Xuejun Liu
  • Hua Liu
  • Xihe Wang
  • Kaihui Li
  • Changyan Tian
  • Peter Christie
Original Article

Abstract

A long-term fertilizer experiment investigating cotton-based cropping systems established in 1990 in central Asia was used to quantify the emissions of CO2, CH4 and N2O from April 2012 to April 2013 to better understand greenhouse gas (GHG) emissions and net global warming potential (GWP) in extremely arid croplands. The study involved five treatments: no fertilizer application as a control (CK), balanced fertilizer NPK (NPK), fertilizer NPK plus straw (NPKS), fertilizer NPK plus organic manure (NPKM), and high rates of fertilizer NPK and organic manure (NPKM+). The net ecosystem carbon balance was estimated by the changes in topsoil (0–20 cm) organic carbon (SOC) density over the 22-year period 1990–2012. Manure and fertilizer combination treatments (NPKM and NPKM+) significantly increased CO2 and slightly increased N2O emissions during and outside the cotton growing seasons. Neither NPK nor NPKS treatment increased SOC in spite of relatively low CO2, CH4 and N2O fluxes. Treatments involving manure application showed the lowest net annual GWP and GHG intensity (GHGI). However, overuse of manure and fertilizers (NPKM+) did not significantly increase cotton yield (5.3 t ha−1) but the net annual GWP (−4,535 kg CO2_eqv. ha−1) and GHGI (−0.86 kg CO2_eqv. kg−1 grain yield of cotton) were significantly lower than in NPKM. NPKS and NPK slightly increased the net annual GWP compared with the control plots. Our study shows that a suitable rate of fertilizer NPK plus manure may be the optimum choice to increase soil carbon sequestration, maintain crop yields, and restrict net annual GWP and GHGI to relatively low levels in extremely arid regions.

Keywords

Carbon dioxide Nitrous oxide Methane GHGI GWP Long-term fertilizer experiment Arid land 

Notes

Acknowledgments

This work was funded by the Chinese National Basic Research Program (2014CB954200), the National Natural Science Foundation of China (Grant 41005001), the West Light Foundation of Chinese Academy of Sciences (XBBS201206) and the National Grey Desert Soil Station of Xinjiang Academy of Agricultural Sciences.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Jinling Lv
    • 1
    • 2
    • 3
  • Xuejun Liu
    • 1
    • 3
  • Hua Liu
    • 4
  • Xihe Wang
    • 4
  • Kaihui Li
    • 1
  • Changyan Tian
    • 1
  • Peter Christie
    • 3
    • 5
  1. 1.Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqiChina
  2. 2.Graduate University of the Chinese Academy of SciencesBeijingChina
  3. 3.College of Resources and Environmental SciencesChina Agricultural UniversityBeijingChina
  4. 4.Soil and Fertilizer InstituteXinjiang Academy of Agricultural SciencesUrumqiChina
  5. 5.Agri-Environment BranchAgri-Food and Biosciences InstituteBelfastUK

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