Review and Model-Based Analysis of Factors Influencing Soil Carbon Sequestration Beneath Switchgrass (Panicum virgatum)
Review and Model-Based Analysis of Factors Influencing Soil Carbon Sequestration Beneath Switchgrass (Panicum virgatum)
复制标题
柳枝稷（Panicum virgatum）下土壤碳汇影响因素的回顾和基于模型的分析
DOI：
10.1007/s12155-011-9154-2
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发表时间：
2011
影响因子：
3.6
通讯作者：
Charles T. Garten
中科院分区：
文献类型：
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作者：
Charles T. Garten
为了总结现有数据并预测美国东南部柳枝菊(Panicum Virgatum)下的土壤固碳，开发了一个多室模型。土壤固碳是可持续生产柳枝菊生物能源的重要组成部分，因为土壤有机质促进了水分保持、养分供应和土壤性质，最大限度地减少了侵蚀。为了实现模型的参数化，对文献进行了综述。对模型的敏感性分析表明，土壤固碳预测受地上生物量、地下生物量与地上生物量之比、年平均温度变化的影响最大。模拟结果表明，柳枝柳生长10年后，土壤固碳年率趋于稳定，而预测的矿质土壤碳储量仍在增加。进行了一个基于模型的实验，以预测不同氮肥水平和土壤初始碳储量(至30厘米深度)下的土壤碳汇速率。在年平均温度为13℃时，预测的土壤固碳速率在−28~114g/m−/年−1(30年后)，在12个模拟中有11个大于零，这些模拟的初始表层土壤碳储量从1到5 kg/m−2，氮肥从0到18 g/N/m−2/年−1。该模型表明，需要对生物量分配过程和成熟人工林的氮素损失分别进行更多的研究，以提高我们对柳枝条农业中碳和氮动态的理解。
A multi-compartment model was developed to summarize existing data and predict soil carbon sequestration beneath switchgrass (Panicum virgatum) in the southeastern USA. Soil carbon sequestration is an important part of sustainable switchgrass production for bioenergy because soil organic matter promotes water retention, nutrient supply, and soil properties that minimize erosion. A literature review was undertaken for the purpose of model parameterization. A sensitivity analysis of the model indicated that predictions of soil carbon sequestration were affected most by changes in aboveground biomass production, the ratio of belowground-to-aboveground biomass production, and mean annual temperature. Simulations indicated that the annual rate of soil carbon sequestration approached steady state after a decade of switchgrass growth while predicted mineral soil carbon stocks were still increasing. A model-based experiment was performed to predict rates of soil carbon sequestration at different levels of nitrogen fertilization and initial soil carbon stocks (to a 30-cm depth). At a mean annual temperature of 13°C, the predicted rate of soil carbon sequestration varied from −28 to 114 g C m−2 year−1 (after 30 years) and was greater than zero in 11 of 12 simulations that varied initial surface soil carbon stocks from 1 to 5 kg C m−2 and nitrogen fertilization from 0 to 18 g N m−2 year−1. The modeling indicated that more research is needed on the process of biomass allocation and on nitrogen loss from mature plantations, respectively, to improve our understanding of carbon and nitrogen dynamics in switchgrass agriculture.