| 赵营,郭鑫年,罗健航,陈晓群,马芸.灌淤土农田土壤有机碳及碳库管理指数对施肥措施的响应[J].干旱地区农业研究,2016,34(3):16~22 |
| 灌淤土农田土壤有机碳及碳库管理指数对施肥措施的响应 |
| 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 |
| 中文关键词: 灌淤土农田 水旱轮作 施肥 土壤总有机碳 土壤活性有机碳 土壤碳库管理指数 |
| 英文关键词:the paddy-upland rotation system fertilization soil total organic carbon soil labile organic carbon soil carbon management index (CMI) |
| 基金项目:国家自然科学基金项目（41401319）；宁夏自然科学基金项目（NZ13104） |
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| 中文摘要: |
| 为了探讨施肥对灌淤土水旱轮作农田土壤有机碳和碳库管理指数的影响特征，寻求合适的土壤增碳措施，在宁夏引黄灌区水稻-春小麦-春玉米轮作体系中，通过3 a田间定位试验研究了不施肥(CK)、平衡施用化肥(NPK)、单施有机肥(M)、化肥+有机肥配施(NPK+M)、化肥+玉米秸秆(NPK+S)和农民习惯施肥(CON)6个不同施肥措施对0～20 cm耕层土壤总有机碳、活性有机碳含量及碳库管理指数的影响。结果表明，在同等氮素供应水平下，无论水田或旱地，NPK、M、NPK+M和NPK+S处理都能达到土壤增碳效果，3年的土壤培肥后，其土壤总有机碳和活性有机碳含量分别达10.03～10.60 g·kg-1和3.00～4.35 g·kg-1，与试验前(9.92 g·kg-1和2.48 g·kg-1)相比分别提高了1.2%～6.8%和20.8%～75.2%，M处理显著高于CK。施用有机肥3 a以上，才能显著提高土壤碳库、碳库活度、活度指数和碳库管理指数。因此，从土壤总有机碳及其活性组分提升的角度考虑，应在平衡施用NPK的基础上，提倡水旱轮作农田长期增施有机肥来提高土壤碳库管理指数。 |
| 英文摘要: |
| 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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