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Chinese Journal of Applied Ecology ›› 2016, Vol. 27 ›› Issue (4): 1196-1202.doi: 10.13287/j.1001-9332.201604.022

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Effects of straw returning combined with medium and microelements application on soil organic carbon sequestration in cropland.

JIANG Zhen-hui, SHI Jiang-lan, JIA Zhou, DING Ting-ting, TIAN Xiao-hong*   

  1. College of Natural Resources and Environment, Northwest A&F University/Key Laboratory for Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, Shaanxi, China
  • Received:2015-09-22 Revised:2016-01-23 Online:2016-04-22 Published:2016-04-22
  • Supported by:
    This work was supported by the National Science & Technology Pillar Program of China (2012BAD14B11) and the National Natural Science Foundation of China (41371288).

Abstract: A 52-day incubation experiment was conducted to investigate the effects of maize straw decomposition with combined medium element (S) and microelements (Fe and Zn) application on arable soil organic carbon sequestration. During the straw decomposition, the soil microbial biomass carbon (MBC) content and CO2-C mineralization rate increased with the addition of S, Fe and Zn, respectively. Also, the cumulative CO2-C efflux after 52-day laboratory incubation significantly increased in the treatments with S, or Fe, or Zn addition, while there was no significant reduction of soil organic carbon content in the treatments. In addition, Fe or Zn application increased the inert C pools and their proportion, and apparent balance of soil organic carbon, indicating a promoting effect of Fe or Zn addition on soil organic carbon sequestration. In contrast, S addition decreased the proportion of inert C pools and apparent balance of soil organic carbon, indicating an adverse effect of S addition on soil organic carbon sequestration. The results suggested that when nitrogen and phosphorus fertilizers were applied, inclusion of S, or Fe, or Zn in straw incorporation could promote soil organic carbon mineralization process, while organic carbon sequestration was favored by Fe or Zn addition, but not by S addition.