Soil organic carbon fractions and management index after 20 yr of manure and fertilizer application for greenhouse vegetables |
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Authors: | Y. Lou M. Xu W. Wang X. Sun C. Liang |
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Affiliation: | 1. Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China;2. Department of Crop & Soil Sciences, Michigan State University, East Lansing, MI 48824, USA;3. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;4. College of Land and Environment, Shenyang Agricultural University, Shenyang 110161, China |
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Abstract: | Impacts of organic manure and inorganic fertilizer on total organic carbon (CT), water‐soluble organic C (CWS), microbial biomass C (CMB), particulate organic C (CP), labile organic C (CL), C storage and sequestration, and C management index (CMI) in surface soil (0–20 cm) were investigated in a 20‐yr field experiment under a greenhouse vegetable system in northeast China. The treatments included unfertilized control (CK), N fertilizer (N), balanced NPK fertilizer (NPK), organic manure alone (M) and the NPK fertilizer combined with the manure (MNPK). Under the treatments of N and NPK, CT content and C storage were not significantly changed over the experimental period, while CWS, CMB, CP, CL concentrations and CMI were significantly increased compared with the unfertilized control. In comparison with the control, the manure treatments, M and MNPK, significantly increased CT content and C storage, sequestrating organic C of 8.9 and 9.2 Mg/ha, respectively. The M and MNPK treatments showed higher CWS, CMB, CP and CL concentrations and CMI than the other three treatments. Pearson’s correlation coefficients were used to show that CWS, CMB, CP, CL and CMI could be useful indicators for assessing soil quality and total C changes. The M treatment is effective in sequestrating soil C, but resulted in lower crop yield compared with the NPK treatment. The MNPK treatment showed the greatest increases in crop yield and C sequestration in the greenhouse vegetable system. |
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Keywords: | Carbon fraction carbon management index carbon sequestration organic manure chemical fertilizer greenhouse vegetable |
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