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Paddy and Water Environment

, Volume 16, Issue 1, pp 199–205 | Cite as

Response of N2O emission to straw retention under two contrasting paddy water conditions: a field experiment over rice–rice-fallow rotation

  • Xiaohong Wu
  • Wei Wang
  • Xiaoli Xie
  • Haijun Hou
  • Chunmei Yin
Short Communication

Abstract

Few studies are available on comprehensive impacts of straw retention and water regimes on nitrous oxide (N2O) emission from rice–rice-fallow rotation systems. A field experiment with or without rice straw (5000 kg ha−1 each rice season) retention under two contrasting water regimes (1. continuous flooding; 2. rain-fed with exception flooding irrigation about 15 days after transplanting) was conducted in south China. N2O emission was monitored using the closed chamber method over the entire rice–rice-fallow rotation. The results demonstrate that there were significant differences in the responses of N2O emission to water regime, straw retention, and their interaction. N2O emission was negligible in the continuously flooded treatments, with annual N2O emission of 0.052 kg ha−1 with straw and − 0.008 kg ha−1 without straw, respectively. In contrast, substantial N2O fluxes were observed under rain-fed condition when water layer disappeared, with annual N2O emission of 0.969 kg ha−1 with straw and of 0.618 kg ha−1 without straw, respectively. About 50–60% of annual N2O emission occurred in fallow season under rain-fed treatments. The results indicate that rice straw retention has a potential to accelerate N2O emission depending on paddy water conditions.

Keywords

Rice straw Water regime Rice–rice-fallow rotation Fallow season Greenhouse gas 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Numbers 41401292 and 41503081) and the International Science and Technology Cooperation Program of China (Grant Number 2015DFA90450).

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Copyright information

© The International Society of Paddy and Water Environment Engineering and Springer Japan KK 2017

Authors and Affiliations

  • Xiaohong Wu
    • 1
    • 2
  • Wei Wang
    • 1
  • Xiaoli Xie
    • 1
  • Haijun Hou
    • 1
  • Chunmei Yin
    • 1
  1. 1.Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical AgricultureChinese Academy of SciencesChangshaChina
  2. 2.Faculty of Life Science and TechnologyCentral South University of Forestry and TechnologyChangshaChina

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