Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (11): 2249-2256.doi: 10.3864/j.issn.0578-1752.2013.11.008

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

Influences of Conservation Tillage on Soil Carbon Extracted by Hot Water and Acid Hydrolysis in the Piedmont Region of Taihang Mountains

 DU  Zhang-Liu, REN  Tu-Sheng, HU  Chun-Sheng   

  1. 1.Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081
    2.College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193
    3.Center for Agricultural Resources Research, Institute of Genetic and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050021
  • Received:2013-02-21 Online:2013-06-01 Published:2013-04-15

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Abstract: 【Objective】 The objective of this study was to investigate the profile distribution of soil carbon extracted by hot water and acid hydrolysis after shifting from conventional tillage to conservation tillage systems.【Method】 The field experiment, initiated from 2001 in Luancheng County of Hebei Province, included four tillage treatments for winter wheat: moldboard plow without corn residue (CK), moldboard plow with corn residue (CT), rotary tillage with corn residue (RT), and no-till with corn residue (NT). After winter wheat harvest in 2007, soil samples were collected at 0-30 cm depth in four increments (0-5, 5-10, 10-20, and 20-30 cm). Soil labile carbon was extracted by hot water (HWC, 80℃ for 24 h) and acid hydrolysis (AHC, 6 mol•L-1 HCl at 105℃ for 4 h), and the stratification ratios (SR) of HWC and AHC were estimated. The HWC and AHC stocks on an equivalent soil mass basis were calculated. 【Result】 Soil liable carbon concentrations in surface soil layer was increased after applying conservation tillage practices for 6 years, as indicated by significantly higher SR values of HWC and AHC. In the 0-10 cm layer, the SR value of HWC was 1.68-1.98 for RT and NT, and 1.30-1.50 for CK and CT; the SR value of AHC ranged from 1.62 to 1.83 under RT and NT, and from 1.12 to 1.63 under CK and CT. In the 0-30 cm layer, no significant changes in HWC stocks among treatments were observed, whereas NT significantly increased AHC stock compared to other treatments.【Conclusion】 Results of the study demonstrated that adoption of conservation tillage systems increased the accumulation of HWC and AHC and resulted in greater stratification of liable carbon in the surface soil. The changes in soil liable carbon may potentially affect soil quality and the rate of soil carbon sequestration.

Key words: conservation tillage , hot water extractable C , acid hydrolyzable C , stratification ratio , soil labile carbon stock

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