| Soil organic carbon and carbon management index affected by the different fertilization methods in the field of irrigation silting soils |
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| DOI：10.7606/j.issn.1000-7601.2016.03.03 |
| Key Words: the paddy-upland rotation system fertilization soil total organic carbon soil labile organic carbon soil carbon management index (CMI) |
| Author Name | Affiliation | | ZHAO Ying | Key Laboratory of Soil and Plant Nutrition of Ningxia Hui Autonomous Region, Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | GUO Xin-nian | Key Laboratory of Soil and Plant Nutrition of Ningxia Hui Autonomous Region, Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | LUO Jian-hang | Key Laboratory of Soil and Plant Nutrition of Ningxia Hui Autonomous Region, Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | CHEN Xiao-qun | Key Laboratory of Soil and Plant Nutrition of Ningxia Hui Autonomous Region, Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | MA Yun | Institute of Quality Standard and Testing Technology for Agro-products of Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China |
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| Abstract: |
| In order to investigate the characteristics of fertilization effects on soil organic carbon and carbon management index of irrigation silting soils in the paddy-upland rotation field, and look for a suitable method for soil carbon improvement and sequestration, a three-year field experiment was conducted to study the effects of six different fertilization methods including no fertilizer (CK), balanced application of chemical fertilizers (NPK), application of manure (M), combination of orinorganic fertilizers (NPK+M), chemical fertilizers plus maize straw (NPK+S), and conventional fertilizers by farmers (CON) on soil total organic carbon content, labile organic carbon content, and carbon management index of the 0～20 cm topsoil in the rotation system of paddy rice-spring wheat-spring maize in the Yellow River irrigation region of Ningxia. The results showed that soil organic carbon content was increased to some extent by treatments NPK, M, NPK+M, and NPK+S under the same N supply in paddy or upland fields. Compared with the soil before any treatment where the corresponding contents were 9.92 and 2.48 g·kg-1, soil total and labile organic carbon contents were 10.03～10.60 and 3.00～4.35 g·kg-1 with these treatments after three years fertilization, improved by 1.2%-6.8% and 20.8%～75.2%, respectively. A significant difference was further found between treatment M and CK. Soil carbon pool index, organic carbon activity, organic carbon activity index, and carbon management index were also significantly increased by the application of manure after three years. Therefore, in consideration of soil organic carbon and increase in its labile component, a balance application of N, P, and K fertilizers should be the base to promote a long-term application of manure for the enhancement of soil carbon management index in the paddy-upland rotation field. |
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