›› 2017, Vol. 29 ›› Issue (9): 1430-1436.DOI: 10.3969/j.issn.1004-1524.2017.09.02

• Crop Science • Previous Articles     Next Articles

Study on soil respiration of direct-sowing winter oilseed rape in paddy field under different tillage conditions

WU Yongcheng1, NIU Yingze1, HU Zongda2, *   

  1. 1. College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China;
    2. College of Resources, Sichuan Agricultural University, Chengdu 611130, China
  • Received:2017-03-06 Online:2017-09-20 Published:2017-09-27

Abstract: In order to explain the characteristic of soil respiration (RS) during the growth season of direct-sowing winter rapeseed in the paddy field, a field experiment was carried out to examine the variations of soil respirations and soil temperature (ST) and soil water content (SWC) at the 5 cm depth of winter oilseed rape under rice-rapeseed rotation system in Chengdu Plain of Sichuan Province from November 2012 to April 2013. It was shown that there was no significant difference of RS between rotary tillage (RT) treatment (1.97 μmol·m-2·s-1) and zero tillage (ZT) treatment (1.86 μmol·m-2·s-1) during growth season of winter oilseed rape. The monthly variation trend of RS was first decreased and then increased and the minimum value appeared in January 2013. Temperature sensitivity (Q10) of RS was 2.07 and 2.16 under RT and ZT, respectively. In addition, there was a significant (P<0.05) positive correlation between RS and above-ground biomass, yet a significant (P<0.05) negative correlation between RS and soil organic carbon. Soil temperature of topsoil was the main influencing factor of soil respiration in direct-sowing winter rapeseed.

Key words: winter oilseed rape (Brassica napus L.), tillage, soil respiration, soil temperature, soil water content

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