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

Author:
Lou, Yilai, Wang, Jingkuan, Liang, Wenju
Source:
Catena 2011 v.87 no.3 pp. 386-390
ISSN:
0341-8162
Subject:
Zea mays, carbon, carbon sequestration, corn, cropping systems, field experimentation, grain yield, microbial biomass, nitrogen fertilizers, potassium permanganate, soil, soil organic carbon, soil productivity, surface storage, China
Abstract:
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 KMnO₄ oxidized organic C (KMnO₄-C) concentrations, C management index (CMI), and C storage in surface soil (0–20cm) were investigated in a maize (Zea may L.) field experiment, Northeast China. The treatments included, CK: unfertilized control, M: organic manure (135kgNha⁻¹year⁻¹), N: inorganic N fertilizer (135kgNha⁻¹year⁻¹) and MN: combination of organic manure (67.5kgNha⁻¹year⁻¹) and inorganic N fertilizer (67.5kgNha⁻¹year⁻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 KMnO₄-C concentrations and CMI than the N treatment. The M treatment was most effective for sequestrating SOC (10.6Mgha⁻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.
Agid:
842020