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首页> 外文期刊>Environmental Pollution >Modelling nitrogen saturation and carbon accumulation in heathland soils under elevated nitrogen deposition
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Modelling nitrogen saturation and carbon accumulation in heathland soils under elevated nitrogen deposition

机译：高氮沉积条件下荒地土壤氮饱和度和碳积累的模拟

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A simple model of nitrogen (N) saturation, based on an extension of the biogeochemical model MAGIC, has been tested at two long-running heathland N manipulation experiments. The model simulates N immobilisation as a function of organic soil C/N ratio, but permits a proportion of immobilised N to be accompanied by accumulation of soil carbon (C), slowing the rate of C/N ratio change and subsequent N saturation. The model successfully reproduced observed treatment effects on soil C and N, and inorganic N leaching, for both sites. At the C-rich upland site, N addition led to relatively small reductions in soil C/N, low inorganic N leaching, and a substantial increase in organic soil C. At the C-poor lowland site, soil C/N ratio decreases and N leaching increases were much more dramatic, and soil C accumulation predicted to be smaller. The study suggests that (i) a simple model can effectively simulate observed changes in soil and leachate N; (ii) previous model predictions based on a constant soil C pool may overpredict future N leaching; (iii) N saturation may develop most rapidly in dry, organic-poor, high-decomposition systems; and (iv) N deposition may lead to significantly enhanced soil C sequestration, particularly in wet, nutrient-poor, organic-rich systems. (c) 2005 Elsevier Ltd. All rights reserved.
机译：基于生物地球化学模型MAGIC的扩展，一个简单的氮（N）饱和度模型已在两个长期运行的欧石南N操纵实验中进行了测试。该模型将固氮量模拟为有机土壤碳/氮比的函数，但是允许一定比例的固氮伴随着土壤碳（C）的积累，从而减慢了碳氮比的变化速率和随后的氮饱和度。该模型成功地再现了两个地点对土壤碳和氮的处理效果以及无机氮的淋洗。在富含碳的旱地，氮的添加导致土壤碳/氮的减少相对较小，无机氮的淋失较低，有机土壤碳的大量增加。在贫碳的低地，土壤碳/氮的比率降低，氮的淋溶增加更为显着，土壤中的碳积累预计较小。研究表明：（i）一个简单的模型可以有效地模拟观察到的土壤和渗滤液氮的变化； （ii）基于恒定土壤碳库的先前模型预测可能会高估未来的氮淋失； （iii）在干燥，有机贫乏，高分解度的系统中，N饱和度发展最快； （iv）氮的沉积可能导致土壤碳的固存显着增加，尤其是在湿的，营养贫乏的，富含有机物的系统中。 （c）2005 Elsevier Ltd.保留所有权利。

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