Impacts of 22-year organic and inorganic N managements on soil organic C fractions in a maize field, northeast China

Impacts of 22-year organic and inorganic N managements on total organic carbon (TOC), water-soluble organic C (WSOC), microbial biomass C (MBC), particulate organic C (POC) and KMnO 4 oxidized organic C (KMnO 4-C) concentrations, C management index (CMI), and C storage in surface soil (0–20 cm) were...

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Bibliographic Details
Published in:Catena (Giessen) 2011-12, Vol.87 (3), p.386-390
Main Authors: Lou, Yilai, Wang, Jingkuan, Liang, Wenju
Format: Article
Language:English
Subjects:
Bgi / Prodig
C management index
Carbon fraction
Chemical fertilizer
Long-term experiment
Organic manure
Pedology
Physical geography
Soil organic carbon
Zea
Zea mays
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Summary:Impacts of 22-year organic and inorganic N managements on total organic carbon (TOC), water-soluble organic C (WSOC), microbial biomass C (MBC), particulate organic C (POC) and KMnO 4 oxidized organic C (KMnO 4-C) concentrations, C management index (CMI), and C storage in surface soil (0–20 cm) were investigated in a maize ( Zea may L.) field experiment, Northeast China. The treatments included, CK: unfertilized control, M: organic manure (135 kg N ha − 1 year − 1 ), N: inorganic N fertilizer (135 kg N ha − 1 year − 1 ) and MN: combination of organic manure (67.5 kg N ha − 1 year − 1 ) and inorganic N fertilizer (67.5 kg N ha − 1 year − 1 ). TOC concentration and C storage were significantly increased under the M and MN treatments, but not under the inorganic N treatment. The organic treatments of M and MN were more effective in increasing WSOC, MBC, POC and KMnO 4-C concentrations and CMI than the N treatment. The M treatment was most effective for sequestrating SOC (10.6 Mg ha − 1 ) and showed similar increase in degree of grain yield to the N and MN treatments, therefore it could be the best option for improving soil productivity and C storage in the maize cropping system. ► Total organic C concentration and C storage were significantly increased under the organic treatments of M and MN. ► Soil organic C fractions and management index were more sensitive to the inorganic N management than total C. ► Organic manuring alone was the best nutrient management for increasing crop yield and soil C sequestration.
ISSN:0341-8162
1872-6887
DOI:10.1016/j.catena.2011.07.006