›› 2018, Vol. 30 ›› Issue (8): 1389-1397.DOI: 10.3969/j.issn.1004-1524.2018.08.17

• Environmental Science • Previous Articles     Next Articles

Effects of fertilization on soil active organic carbon and carbon pool management index

LUO Yuanjun1, PU Yulin1,2,*, LONG Gaofei3, YE Chun1, ZHU Bo2   

  1. 1. College of Resources, Sichuan Agricultural University, Chengdu 611130, China;
    2. Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Chengdu 610041, China;
    3. Chengdu Hydrogeological Engineering Geology Team, Sichuan Bureau of Geology and Mineral Resources, Chengdu 610072, China
  • Received:2017-11-17 Online:2018-08-25 Published:2018-08-28

Abstract: Based on long-term field experiment, the effects of different fertilization treatments on purple soil active organic carbon and carbon pool management index (CPMI) were investigated. Six fertilization treatments were used in this study, including no fertilizer (CK), only synthetic N fertilizer (N), synthetic NPK fertilizer (NPK), only organic manure (OM), organic manure with synthetic NPK (OMNPK), crop residues with synthetic NPK (RSDNPK). The results showed that all treatments with fertilizers increased the content of soil organic carbon and active organic carbon compared with CK, and OM and RSDNPK showed the highest enhancement. The content of soil total organic carbon (TOC), permanganate oxidized organic carbon (PXOC), microbial biomass carbon (MBC), dissolved organic carbon (DOC) were increased by 91.4%, 109.2%, 57.5%, 35.1%, respectively, in OM, and by 142.8%, 95.4%, 70.8%, 46.2%, respectively, in RSDNPK. PXOC, MBC and DOC accounted for 36.18%-49.13%, 1.64%-2.58% and 0.57%-0.94% of TOC, respectively. The proportions of PXOC and MBC were significantly (P<0.05) decreased in RSDNPK compared to those in CK, but the proportion of DOC had no significant change within all treatments. CPMI of OM and RSDNPK were significantly (P<0.05) higher than those of N and NPK treatments. The content of PXOC, MBC were significantly (P<0.05 or P<0.01) positively correlated with the content of N, P nutrient, and CPMI were significantly (P<0.05 or P<0.01) positively correlated with the content of PXOC, MBC, TN, AN and AP. It was concluded that application of organic manure or crop residues with synthetic NPK fertilizer could increase the organic carbon storage and improve soil quality. PXOC and CPMI could be used as sensitive indicators of purple soil quality.

Key words: organic manure, crop residues returning, purple soil

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