Feasibility of the 4 per 1000 aspirational target for soil carbon: A case study for France.
Feasibility of the 4 per 1000 aspirational target for soil carbon: A case study for France.
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4/1000的土壤碳期望目标的可行性：法国的案例研究。
DOI：
10.1111/gcb.15547
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发表时间：
2021-06
影响因子：
11.6
通讯作者：
Pellerin S
中科院分区：
文献类型：
--
作者：
Martin MP;Dimassi B;Román Dobarco M;Guenet B;Arrouays D;Angers DA;Blache F;Huard F;Soussana JF;Pellerin S
增加土壤有机碳（SOC）储量是缓解大气CO2浓度增加的一种有效途径。根据全球范围内人为CO2排放量与SOC储量之间的简单比率，有人建议SOC储量每年增加0.4%（4/1000）可以补偿目前的人为CO2排放量。在这里，我们使用了反向RothC建模方法来估计维持当前SOC储量所需的土壤C输入量，并在30年内每年增加4‰。我们首先通过比较所需的碳输入与流入土壤的净初级生产力（NPP），其次通过考虑SOC饱和度概念来评估这一理想目标的可行性。在1公里网格单元分辨率下，对法国大陆进行了计算。结果表明，在30年的时间里，土壤中的C输入需要增加30%-40%才能每年增加4‰。88.4%的耕地被认为是不饱和的矿物相关的SOC，但其特征是低于目标碳平衡，即可用的NPP低于达到4‰的目标所需的。相反，90.4%的未改良草地的特征是高于目标C平衡，即足够的NPP达到4‰的目标，但59.1%也饱和。改良草地和森林的情况在四个类别（饱和与不饱和以及高于与低于目标碳平衡）中的分布较为均匀。土壤监测网络的未来数据应该能够验证这些结果。总体而言，我们的研究结果表明，法国大陆，优先事项应是（1）增加NPP回报农田土壤不饱和，并有低于目标的碳平衡和（2）保持SOC股票在其他土地利用。每1000人中4人的目标表明，土壤有机碳（SOC）储量每年增加0.4%可以补偿目前的人为CO2排放。使用SOC动态模型，可用的净初级生产力（NPP）的估计，并应用SOC饱和度的概念，我们评估其可行性的情况下，法国大陆。我们的研究结果表明，千分之四的目标只能在有限的地区实现。优先事项应是增加不饱和和碳平衡低于目标的农田土壤的NPP回报，但也要保护其他土地利用中的SOC储量。
Increasing soil organic carbon (SOC) stocks is a promising way to mitigate the increase in atmospheric CO2 concentration. Based on a simple ratio between CO2 anthropogenic emissions and SOC stocks worldwide, it has been suggested that a 0.4% (4 per 1000) yearly increase in SOC stocks could compensate for current anthropogenic CO2 emissions. Here, we used a reverse RothC modelling approach to estimate the amount of C inputs to soils required to sustain current SOC stocks and to increase them by 4‰ per year over a period of 30 years. We assessed the feasibility of this aspirational target first by comparing the required C input with net primary productivity (NPP) flowing to the soil, and second by considering the SOC saturation concept. Calculations were performed for mainland France, at a 1 km grid cell resolution. Results showed that a 30%–40% increase in C inputs to soil would be needed to obtain a 4‰ increase per year over a 30‐year period. 88.4% of cropland areas were considered unsaturated in terms of mineral‐associated SOC, but characterized by a below target C balance, that is, less NPP available than required to reach the 4‰ aspirational target. Conversely, 90.4% of unimproved grasslands were characterized by an above target C balance, that is, enough NPP to reach the 4‰ objective, but 59.1% were also saturated. The situation of improved grasslands and forests was more evenly distributed among the four categories (saturated vs. unsaturated and above vs below target C balance). Future data from soil monitoring networks should enable to validate these results. Overall, our results suggest that, for mainland France, priorities should be (1) to increase NPP returns in cropland soils that are unsaturated and have a below target carbon balance and (2) to preserve SOC stocks in other land uses. The 4 per 1000 aspirational target suggests that a 0.4% yearly increase in soil organic carbon (SOC) stocks could compensate for current anthropogenic CO2 emissions. Using a model of SOC dynamics, estimates of available net primary productivity (NPP), and applying the SOC saturation concept, we assessed its feasibility in the case of mainland France. Our results indicate that the 4 per 1000 target is reachable only for limited areas. Priorities should be to increase NPP returns in cropland soils that are unsaturated and have a below target carbon balance, but also to preserve SOC stocks in other land uses.
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影响因子：
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