论文标题
土壤有机物（SOM）动力学对不同植被输入和气候的生物地球化学参数的相似性和差异
Similarities and differences in the sensitivity of Soil Organic Matter (SOM) dynamics to biogeochemical parameters for different vegetation inputs and climates
论文作者
论文摘要
环境模型的生物地球化学复杂性正在持续增加，并且在实现新实施时必须重新安排模型的可靠性。这项工作旨在确定影响不同生态系统中土壤有机物（SOM）动力学和温室气体排放的有影响力的生物地球化学参数，并通过基于物理的机械模型预测的气候。这明确说明了四个有机聚合物，七个有机单体，五个微生物官能团和无机N和C种。我们首先对模型进行了测试，以针对德国东北部的温带森林中测量的垂直SOM剖面（Staudt and Foken，2007年）。接下来，我们使用改良的莫里斯指数对澳大利亚热带，温带和半干旱草地的目标SOM池和气体排放进行了敏感性分析对生物地球化学参数进行了敏感性分析。我们发现，与其他生物地球化学参数相比，顶部土壤中的温室气体排放，SOM库存和真菌比对有氧细菌的死亡率更敏感。森林中的二氧化碳排放率比草原上的二氧化碳排放率更大，该二氧化碳的含量更大。最后，我们发现土壤的可用性在很大程度上受到森林中的植被输入和草原大气固定的控制
The biogeochemical complexity of environmental models is increasing continuously and model reliability must be reanalysed when new implementations are brought about. This work aim to identify influential biogeochemical parameters that control the Soil Organic Matter (SOM) dynamics and greenhouse gas emissions in different ecosystems and climates predicted by a physically-based mechanistic model. This explicitly accounts for four pools of organic polymers, seven pools of organic monomers, five microbial functional groups, and inorganic N and C species. We first benchmarked our model against vertical SOM profiles measured in a temperate forest in North-Eastern Bavaria, Germany (Staudt and Foken, 2007). Next, we conducted a sensitivity analysis to biogeochemical parameters using modified Morris indices for target SOM pools and gas emissions from a tropical, a temperate, and a semi-arid grassland in Australia. We found that greenhouse gas emissions, the SOM stock, and the fungi-to-bacteria ratio in the top soil were more sensitive to the mortality of aerobic bacteria than other biogeochemical parameters. The larger CO2 emission rates in forests than in grasslands were explained by a greater dissolved SOM content. Finally, we found that the soil N availability was largely controlled by vegetation inputs in forests and by atmospheric fixation in grasslands
