Evaluation of an integrated biogeochemical model (PnET-BGC) at a northern hardwood forest ecosystem
Evaluation of an integrated biogeochemical model (PnET-BGC) at a northern hardwood forest ecosystem
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DOI：
10.1029/2000wr900375
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发表时间：
2001-04-01
影响因子：
5.4
通讯作者：
Likens, GE
中科院分区：
文献类型：
--
作者：
Gbondo-Tugbawa, SS;Driscoll, CT;Likens, GE
本文建立了一个综合生态地球化学模型（PnET-BGC），用于模拟北方森林生态系统中植被、土壤和排水的化学转化。该模型以月为时间步长，描述了主要的地球化学过程，如森林冠层元素转化、水文、土壤有机质动态、氮循环、地球化学风化以及涉及固相和溶液相的化学平衡反应。该模型进行了评估，对土壤和流数据在哈伯德布鲁克实验森林，新罕布什尔州。模式预测的主要元素的浓度和通量一般同意合理以及与测量值，估计归一化平均误差和归一化平均绝对误差。模型输出的土壤盐基饱和度和溪流酸中和能力对土壤CO2分压、土壤质量、土壤阳离子交换量、土壤钙铝选择性系数等参数值敏感。PnET-BGC可以作为一种工具来评估森林生态系统的土壤和水化学的干扰，如皆伐，气候事件，和大气沉降的响应。
An integrated biogeochemical model (PnET-BGC) was formulated to simulate chemical transformations of vegetation, soil, and drainage water in northern forest ecosystems. The model operates on a monthly time step and depicts the major biogeochemical processes, such as forest canopy element transformations, hydrology, soil organic matter dynamics, nitrogen cycling, geochemical weathering, and chemical equilibrium reactions involving solid and solution phases. The model was evaluated against soil and stream data at the Hubbard Brook Experimental Forest, New Hampshire. Model predictions of concentrations and fluxes of major elements generally agreed reasonably well with measured values, as estimated by normalized mean error and normalized mean absolute error. Model output of soil base saturation and stream acid neutralizing capacity were sensitive to parameter values of soil partial pressure of carbon dioxide, soil mass, soil cation exchange capacity, and soil selectivity coefficients of calcium and aluminum. PnET-BGC can be used as a tool to evaluate the response of soil and water chemistry of forest ecosystems to disturbances such as clear-cutting, climatic events, and atmospheric deposition.