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Agroforestry Systems

, Volume 76, Issue 1, pp 67–80 | Cite as

Crop residue effect on crop performance, soil N2O and CO2 emissions in alley cropping systems in subtropical China

  • Z. L. Guo
  • C. F. CaiEmail author
  • Z. X. Li
  • T. W. Wang
  • M. J. Zheng
Article

Abstract

Land management practices that simultaneously improve soil properties are crucial to high crop production and minimize detrimental impact on the environment. We examined the effects of crop residues on crop performance, the fluxes of soil N2O and CO2 under wheat-maize (WM) and/or faba bean-maize (FM) rotations in Amorpha fruticosa (A) and Vetiveria zizanioides (V) intercropping systems on a loamy clay soil, in subtropical China. Crop performance, soil N2O and CO2 as well as some potential factors such as soil water content, soil carbon, soil nitrogen, microbial biomass and N mineralization were recorded during 2006 maize crop cultivation. Soil N2O and CO2 fluxes are determined using a closed-based chamber. Maize yield was greater after faba bean than after wheat may be due to differences in supply of N from residues. The presence of hedgerow significantly improved maize grain yields. N2O emissions from soils with maize were considerably greater after faba bean (345 g N2O–N ha−1) than after wheat (289 g N2O–N ha−1). However, the cumulated N2O emissions did not differ significantly between WM and FM. The difference in N2O emissions between WM and FM was mostly due to the amounts of crop residues. Hedgerow alley cropping tended to emit more N2O than WM and FM, in particular A. fruticosa intercropping systems. Over the entire 118 days of measurement, the N2O fluxes represented 534 g N2O–N ha−1 (AWM) and 512 g N2O–N ha−1 (AFM) under A. fruticosa species, 403 g N2O–N ha−1 (VWM) and 423 g N2O–N ha−1 (VFM) under Vetiver grass. We observed significantly higher CO2 emission in AFM (5,335 kg CO2–C ha−1) from June to October, whereas no significant difference was observed among WM (3,480 kg CO2–C ha−1), FM (3,302 kg CO2–C ha−1), AWM (3,877 kg CO2–C ha−1), VWM (3,124 kg CO2–C ha−1) and VFM (3,309 kg CO2–C ha−1), indicating the importance of A. fruticosa along with faba bean residue on CO2 fluxes. As a result, crop residues and land conversion from agricultural to agroforestry can, in turn, influence microbial biomass, N mineralization, soil C and N content, which can further alter the magnitude of crop growth, soil N2O and CO2 emissions in the present environmental conditions.

Keywords

N2O emission CO2 emission Crop residue Hedge Microbial biomass N mineralization WFPS 

Notes

Acknowledgements

This study was financial support from the Major State Basic Research Development Program of the People’s Republic of China (Project Number 2007CB407201) and the National Natural Science Foundation of China (Project Number 40671114). We are also grateful to Dr. Luuk Koopal from Wageningen University for his revision, and the anonymous reviewer and editor for their helpful comments and suggestions that improved the manuscript greatly.

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© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Z. L. Guo
    • 1
  • C. F. Cai
    • 1
    Email author
  • Z. X. Li
    • 1
  • T. W. Wang
    • 1
  • M. J. Zheng
    • 1
  1. 1.College of Resource and EnvironmentHuazhong Agricultural UniversityWuhanPeople’s Republic of China

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