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[目的]探讨长期不同施肥下新疆灰漠土的土壤呼吸变化特征,为西北干旱区灰漠土农田土壤碳通量的计算以及灰漠土固碳潜力的评估提供依据。[方法]在连续定位施肥22 a灰漠土长期试验的12个处理中选择5个处理,利用英国ACE土壤碳通量测量仪,对其呼吸速率进行24 h的连续监测。同时监测试验区气温和5 cm地表温度等相关气象数据。[结果]长期施用有机物料(NPKM、M、S)的土壤呼吸速率总体高于不施用有机物料(NPK、CK)的处理,以单施有机肥(M)处理对土壤呼吸速率的影响最为显著,秸秆还田处理其次。NPKM处理的土壤呼吸速率小于M和S,说明化肥配合有机肥的施肥方式能够减缓农田CO_2的释放,长期施用有机物料处理的土壤呼吸速率对环境温度的敏感性大于不施用有机物料的土壤,除NPKM处理外,其余处理与地表温度间存在线性关系。[结论]从农业固碳减排和土壤肥力培育的角度,有机无机配合施用是实现新疆农田地力提升和环境友好双赢的重要培肥措施。
[Objective] The research aimed to discuss the characteristics of soil respiration of Xinjiang desert soils under long-term fertilization, and provide the basis for the calculation of soil carbon flux and the carbon sequestration potential of desert soils. [Method] Five treatments were selected from 12 treatments of long-term experiment of continuous positioning and fertilization for 22 a gray desert soil. The respiration rate was monitored continuously for 24 h by British ACE soil carbon flux meter. At the same time, the meteorological data such as air temperature in the test area and surface temperature of 5 cm were monitored. [Result] The results showed that the soil respiration rate of long-term application of organic material (NPKM, M, S) was higher than that of no-organic matter treatment (NPK, CK) , Followed by straw treatment. NPKM treatment of soil respiration rate is less than M and S, indicating that fertilizer with organic manure fertilization mode can slow the release of CO 2 in farmland, long-term application of organic material treatment of soil respiration rate is more sensitive to ambient temperature than the soil without organic material NPKM treatment, there is a linear relationship between other treatments and surface temperature. [Conclusion] From the perspective of carbon sequestration in agriculture and cultivation of soil fertility, organic-inorganic combination application is an important measure to achieve fertility improvement and environment friendly win-win in Xinjiang.