当前位置：
X-MOL 学术
›
GCB Bioenergy
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Sorghum biomass production in the continental United States and its potential impacts on soil organic carbon and nitrous oxide emissions
Global Change Biology Bioenergy ( IF 5.9 ) Pub Date : 2020-08-28 , DOI: 10.1111/gcbb.12736 Sagar Gautam 1, 2 , Umakant Mishra 1, 2 , Corinne D. Scown 2, 3, 4 , Yao Zhang 5
Global Change Biology Bioenergy ( IF 5.9 ) Pub Date : 2020-08-28 , DOI: 10.1111/gcbb.12736 Sagar Gautam 1, 2 , Umakant Mishra 1, 2 , Corinne D. Scown 2, 3, 4 , Yao Zhang 5
Affiliation
|
National scale projections of bioenergy crop yields and their environmental impacts are essential to identify appropriate locations to place bioenergy crops and ensure sustainable land use strategies. In this study, we used the process‐based Daily Century (DAYCENT) model with site‐specific environmental data to simulate sorghum (Sorghum bicolor L. Moench) biomass yield, soil organic carbon (SOC) change, and nitrous oxide emissions across cultivated lands in the continental United States. The simulated rainfed dry biomass productivity ranged from 0.8 to 19.2 Mg ha−1 year−1, with a spatiotemporal average of 
Mg ha−1 year−1, and a coefficient of variation of 35%. The average SOC sequestration and direct nitrous oxide emission rates were simulated as 
Mg CO2e ha−1 year−1 and 
Mg CO2e ha−1 year−1, respectively. Compared to field‐observed biomass yield data at multiple locations, model predictions of biomass productivity showed a root mean square error (RMSE) of 5.6 Mg ha−1 year−1. In comparison to the multi State (n = 21) NASS database, our results showed RMSE of 5.5 Mg ha−1 year−1. Model projections of baseline SOC showed RMSE of 1.9 kg/m2 in comparison to a recently available continental SOC stock dataset. The model‐predicted N2O emissions are close to 1.25% of N input. Our results suggest 10.2 million ha of cultivated lands in the Southern and Lower Midwestern United States will produce >10 Mg ha−1 year−1 with net carbon sequestration under rainfed conditions. Cultivated lands in Upper Midwestern states including Iowa, Minnesota, Montana, Michigan, and North Dakota showed lower sorghum biomass productivity (average: 6.9 Mg ha−1 year−1) with net sequestration (average: 0.13 Mg CO2e ha−1 year−1). Our national‐scale spatially explicit results are critical inputs for robust life cycle assessment of bioenergy production systems and land use‐based climate change mitigation strategies.
中文翻译：
美国大陆的高粱生物量生产及其对土壤有机碳和一氧化二氮排放的潜在影响
国家对生物能源作物产量及其环境影响的规模预测对于确定放置生物能源作物的适当地点并确保可持续土地利用战略至关重要。在这项研究中，我们使用基于过程的Daily Century（DAYCENT）模型和特定地点的环境数据来模拟整个耕地的高粱（Sorghum bicolor L. Moench）生物量产量，土壤有机碳（SOC）变化和一氧化二氮排放量在美国大陆。模拟的雨养干生物量生产率范围为0.8到19.2 Mg ha - 1 年-1，时空平均值为 Mg ha - 1 年-1，变异系数为35％。将平均SOC隔离和直接一氧化二氮排放速率模拟为 Mg CO 2 eha -1 year -1和 Mg CO 2 eha -1 year -1。与在多个地点现场观察到的生物量产量数据相比，生物量生产率的模型预测显示均方根误差（RMSE）为5.6 Mg ha - 1 年-1。与多州（n = 21）NASS数据库相比，我们的结果显示，RMSE为5.5 Mg ha - 1 年-1。基线SOC的模型预测显示RMSE为1.9 kg / m与最近可用的大陆SOC存量数据集相比为2。模型预测的N 2 O排放量接近氮输入量的1.25％。我们的结果表明，美国南部和中西部下部的1,020万公顷耕地将在雨养条件下产生超过10 Mg ha - 1 年-1的净碳固存。中西部上州（包括爱荷华州，明尼苏达州，蒙大拿州，密歇根州和北达科他州）的耕地显示出较低的高粱生物量生产率（平均：6.9 Mg ha - 1 年-1），净固存量（平均：0.13 Mg CO 2 e ha - 1 年）-1）。我们国家级在空间上明确的结果对于生物能源生产系统的生命周期评估以及基于土地使用的气候变化缓解策略的稳健生命周期评估至关重要。
更新日期：2020-08-28
Mg ha−1 year−1, and a coefficient of variation of 35%. The average SOC sequestration and direct nitrous oxide emission rates were simulated as Mg CO2e ha−1 year−1 and Mg CO2e ha−1 year−1, respectively. Compared to field‐observed biomass yield data at multiple locations, model predictions of biomass productivity showed a root mean square error (RMSE) of 5.6 Mg ha−1 year−1. In comparison to the multi State (n = 21) NASS database, our results showed RMSE of 5.5 Mg ha−1 year−1. Model projections of baseline SOC showed RMSE of 1.9 kg/m2 in comparison to a recently available continental SOC stock dataset. The model‐predicted N2O emissions are close to 1.25% of N input. Our results suggest 10.2 million ha of cultivated lands in the Southern and Lower Midwestern United States will produce >10 Mg ha−1 year−1 with net carbon sequestration under rainfed conditions. Cultivated lands in Upper Midwestern states including Iowa, Minnesota, Montana, Michigan, and North Dakota showed lower sorghum biomass productivity (average: 6.9 Mg ha−1 year−1) with net sequestration (average: 0.13 Mg CO2e ha−1 year−1). Our national‐scale spatially explicit results are critical inputs for robust life cycle assessment of bioenergy production systems and land use‐based climate change mitigation strategies.
中文翻译：
美国大陆的高粱生物量生产及其对土壤有机碳和一氧化二氮排放的潜在影响
国家对生物能源作物产量及其环境影响的规模预测对于确定放置生物能源作物的适当地点并确保可持续土地利用战略至关重要。在这项研究中，我们使用基于过程的Daily Century（DAYCENT）模型和特定地点的环境数据来模拟整个耕地的高粱（Sorghum bicolor L. Moench）生物量产量，土壤有机碳（SOC）变化和一氧化二氮排放量在美国大陆。模拟的雨养干生物量生产率范围为0.8到19.2 Mg ha - 1 年-1，时空平均值为
Mg ha - 1 年-1，变异系数为35％。将平均SOC隔离和直接一氧化二氮排放速率模拟为 Mg CO 2 eha -1 year -1和 Mg CO 2 eha -1 year -1。与在多个地点现场观察到的生物量产量数据相比，生物量生产率的模型预测显示均方根误差（RMSE）为5.6 Mg ha - 1 年-1。与多州（n = 21）NASS数据库相比，我们的结果显示，RMSE为5.5 Mg ha - 1 年-1。基线SOC的模型预测显示RMSE为1.9 kg / m与最近可用的大陆SOC存量数据集相比为2。模型预测的N 2 O排放量接近氮输入量的1.25％。我们的结果表明，美国南部和中西部下部的1,020万公顷耕地将在雨养条件下产生超过10 Mg ha - 1 年-1的净碳固存。中西部上州（包括爱荷华州，明尼苏达州，蒙大拿州，密歇根州和北达科他州）的耕地显示出较低的高粱生物量生产率（平均：6.9 Mg ha - 1 年-1），净固存量（平均：0.13 Mg CO 2 e ha - 1 年）-1）。我们国家级在空间上明确的结果对于生物能源生产系统的生命周期评估以及基于土地使用的气候变化缓解策略的稳健生命周期评估至关重要。
京公网安备 11010802027423号