Ecological Research

, Volume 26, Issue 4, pp 735–743

Seasonal dynamics of soil CO2 efflux in a conventional tilled wheat field of the Loess Plateau, China

  • Hongxing Zhang
  • Xiaoping Zhou
  • Fei Lu
  • Junzhu Pang
  • Zongwei Feng
  • Wenzhao Liu
  • Zhiyun Ouyang
  • Xiaoke Wang
Original Article

DOI: 10.1007/s11284-011-0832-5

Cite this article as:
Zhang, H., Zhou, X., Lu, F. et al. Ecol Res (2011) 26: 735. doi:10.1007/s11284-011-0832-5
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Abstract

An automated chamber system was employed to measure the soil CO2 efflux (SCE) in situ for 2 years in a conventional wheat field of the Loess Plateau, China under semi-arid conditions. The annual mean SCE values were 2.44 ± 2.52 μmol m−2 s−1 in 2006 and 2.37 ± 2.33 μmol m−2 s−1 in 2007. Distinct seasonality in the SCE was observed, with significant differences occurring among four periods divided by harvesting, tillage and sowing. In the period from tillage to sowing, the mean SCE values were 2.82 and 2.69 times the annual mean values in 2006 and 2007, respectively, and SCE accounted for 39% and 48% of the annual total within 14% and 18% of the days of the years. Although there were significant exponential correlations between the SCE and soil temperature, and significant linear correlations between the SCE and soil moisture for measurements conducted in the periods before tillage and after sowing each year, the SCE from tillage to sowing was significantly beyond the correlation curves. These findings indicated that seasonal variation in the SCE in a conventional field was controlled not only by soil temperature and moisture, but also by tillage practice. The confounding effects of climate and practice on SCE should be considered when developing ways to mitigate soil carbon loss in conventional cropland in semi-arid regions.

Keywords

Soil CO2 effluxSeasonal dynamicsTemperatureMoistureTillage

Copyright information

© The Ecological Society of Japan 2011

Authors and Affiliations

  • Hongxing Zhang
    • 1
  • Xiaoping Zhou
    • 1
  • Fei Lu
    • 1
  • Junzhu Pang
    • 1
    • 2
  • Zongwei Feng
    • 1
  • Wenzhao Liu
    • 3
  • Zhiyun Ouyang
    • 1
  • Xiaoke Wang
    • 1
  1. 1.State Key Laboratory of Urban and Regional EcologyResearch Center for Eco-Environmental Sciences, CASBeijingChina
  2. 2.Forest College of Northwest A&F UniversityYanglingChina
  3. 3.Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water ResourcesYanglingChina