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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >ForCent model development and testing using the Enriched Background Isotope Study experiment
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ForCent model development and testing using the Enriched Background Isotope Study experiment

机译：使用丰富的背景同位素研究实验进行ForCent模型开发和测试

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The ForCent forest ecosystem model was developed by making major revisions to the DayCent model including: (1) adding a humus organic pool, (2) incorporating a detailed root growth model, and (3) including plant phenological growth patterns. Observed plant production and soil respiration data from 1993 to 2000 were used to demonstrate that the ForCent model could accurately simulate ecosystem carbon dynamics for the Oak Ridge National Laboratory deciduous forest. A comparison of ForCent versus observed soil pool ~(14)C signature (Δ ~(14)C) data from the Enriched Background Isotope Study ~(14)C experiment (1999-2006) shows that the model correctly simulates the temporal dynamics of the ~(14)C label as it moved from the surface litter and roots into the mineral soil organic matter pools. ForCent model validation was performed by comparing the observed Enriched Background Isotope Study experimental data with simulated live and dead root biomass Δ ~(14)C data, and with soil respiration Δ ~(14)C (mineral soil, humus layer, leaf litter layer, and total soil respiration) data. Results show that the model correctly simulates the impact of the Enriched Background Isotope Study ~(14)C experimental treatments on soil respiration Δ ~(14)C values for the different soil organic matter pools. Model results suggest that a two-pool root growth model correctly represents root carbon dynamics and inputs to the soil. The model fitting process and sensitivity analysis exposed uncertainty in our estimates of the fraction of mineral soil in the slow and passive pools, dissolved organic carbon flux out of the litter layer into the mineral soil, and mixing of the humus layer into the mineral soil layer.
机译：ForCent森林生态系统模型是通过对DayCent模型进行重大修改而开发的，其中包括：（1）添加腐殖质有机库;（2）包含详细的根系生长模型;（3）包括植物物候生长模式。从1993年至2000年观察到的植物产量和土壤呼吸数据用于证明，ForCent模型可以准确地模拟橡树岭国家实验室落叶林的生态系统碳动态。将富集背景同位素研究〜（14）C实验（1999-2006）中的ForCent与观察到的土壤池〜（14）C特征（Δ〜（14）C）数据进行比较，结果表明该模型正确地模拟了土壤的时间动态〜（14）C标签从表层垃圾中移出并扎根到矿物土壤有机质库中。通过将观察到的丰富的背景同位素研究实验数据与模拟的活根和死根生物量Δ〜（14）C数据以及土壤呼吸Δ〜（14）C（矿质土壤，腐殖质层，枯枝落叶层）进行比较，进行ForCent模型验证以及总土壤呼吸）数据。结果表明，该模型正确模拟了丰富的背景同位素研究〜（14）C实验处理对不同土壤有机质库中土壤呼吸Δ〜（14）C值的影响。模型结果表明，两池根系生长模型正确地代表了根系碳动力学和对土壤的输入。模型拟合过程和敏感性分析暴露了我们在慢速和被动池中的矿质土壤比例，从垫料层流出的溶解有机碳通量进入矿质土壤以及腐殖质层混入矿质土壤层的估计中的不确定性。 。

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