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稻田土壤有机碳变化的模拟:SCNC模型检验

Keywords: SCNC模型,稻田,有机碳,模拟

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Abstract:

应用自主建立的土壤碳循环模型(SCNC)模拟了中亚热带地区6个稻田长期定位试验土壤有机碳15年间的变化。结果表明,SCNC模型较为准确地模拟了各处理土壤有机碳的变化趋势,在所有模拟值与实测值的比较中,相对误差的绝对值<5%的比率占43.89%,<10%的则占71.11%。监测点土壤有机碳实测值和模拟值的相关性均达到了极显著水平,二者相关曲线的斜率均在0.95 ̄1.05之间。说明SCNC模型适合于我国亚热带稻田土壤有机碳的模拟,但模拟结果也表明,模型在一定程度上(<20%)低估了不施肥处理的有机碳积累量,需要进一步改进。

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