Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (5): 978-986.doi: 10.3864/j.issn.0578-1752.2013.05.013

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Active Fractions and δ13C Value of Soil Organic Carbon in Paddy Fields Under Ridge-Cultivation and No Tillage System

 CI  恩, ZHU  Jie, PENG  Juan, FU  Zhuo-Wang, GAO  Ming, XIE  De-Ti   

  1. 1.College of Resources and Environment, Southwest University, Chongqing 400716
    2.Chongqing Engineering Research Center for Agricultural Non-point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing 400716
  • Received:2012-12-05 Online:2013-03-01 Published:2013-01-13

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Abstract: 【Objective】The objective of this study was to clarify the effect of ridge-cultivation and no tillage system on active fractions and δ13C value of soil organic carbon in paddy fields, and provide some scientific references for revealing the characteristics of organic carbon accumulation and transform in paddy soils under ridge-cultivation and no tillage system. 【Method】 The study based on a long-term filed experiment was conducted to investigate the influence of different cultivation treatments on total organic carbon (TOC), particulate organic carbon (POC), labile organic carbon (LOC) and δ13C value in different paddy soil layers (0-10 cm, 10-20 cm, 20-40 cm and 40-60 cm). The field experiment included four cultivation treatments: conventional tillage with rotation of rice and winter fallow (CT1), conventional tillage with rotation of rice and rape (CT2)，ridge-cultivation and no tillage with rotation of rice and winter fallow (NT1), ridge-cultivation and no tillage with rotation of rice and rape (NT2). 【Result】SOC content in the 20-40 cm layer was significantly higher in treatment NT2 compared to other treatments (P＜0.05). In treatment NT2, POC contents and proportions of POC to TOC in different soil layers were significantly higher than that in other treatments, LOC contents in the 10-20 cm and 20-40 cm layers were obviously higher than that in other treatments (P＜0.05). In treatment CT2, TOC contents, POC contents and LOC contents in different soil layers were lower than that in other treatments. In different treatments, the highest and lowest carbon pool management indexes were found respectively in the 20-40 cm layer in treatment NT2 and in the 40-60 cm layer in treatment CT2. Carbon pool management indexes in the 10-20 cm and 20-40 cm layers were obviously higher in treatment NT2 than that in other treatments (P＜0.05). Differences among δ13C values in different soil layers of 0-40 cm were lower in treatment NT2 compared to other treatments, and the obvious increasement of δ13C value in treatment NT2 was found in the 40-60 cm layer.【Conclusion】After all treatments were performed for a long time (20 yr), organic carbon accumulation in the 20-40 cm layer was much more obvious in treatment NT2 compared to other cultivation treatments. Ridge-cultivation and no tillage with rotation of rice and rape (NT2) was beneficial to formation and accumulation of POC in paddy fields, and played more effective roles in stabilize and protect active carbon pool compared to other cultivation treatments. In addition, a lot of active and less decomposed organic carbon was accumulated in the 20-40 cm soil layers under ridge-cultivation and no tillage with rotation of rice and rape.

Key words: ridge-cultivation and no tillage , paddy field , particulate organic carbon , labile organic carbon , δ13C

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