Soil carbon losses reduce soil moisture in global climate model simulations

IF 1.6 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Earth Interactions Pub Date : 2022-08-26 DOI:10.1175/ei-d-22-0003.1
S. McDermid, Ensheng Weng, M. Puma, B. Cook, T. Hengl, J. Sanderman, Gabrielle J. M. De Lannoy, I. Aleinov
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引用次数: 3

Abstract

Most agricultural soils have experienced substantial soil organic carbon losses in time. These losses motivate recent calls to restore organic carbon in agricultural lands to improve biogeochemical cycling and for climate change mitigation. Declines in organic carbon also reduce soil infiltration and water holding capacity, which may have important effects on regional hydrology and climate. To explore the regional hydroclimate impacts of soil organic carbon changes, we conduct new global climate model experiments with NASA Goddard Institute for Space Studies ModelE that include spatially-explicit soil organic carbon concentrations associated with different human land management scenarios. Compared to a “no land use” case, a year 2010 soil degradation scenario, in which organic carbon content (OCC, weight %) is reduced by a factor of ∼0.12 on average across agricultural soils, resulted in soil moisture losses between 0.5 and 1 temporal standard deviations over eastern Asia, northern Europe and the eastern USA. In a more extreme idealized scenario where OCC is reduced uniformly by 0.66 across agricultural soils, soil moisture losses exceed one standard deviation in both hemispheres. Within the model, these soil moisture declines occur primarily due to reductions in porosity (and to a lesser extent infiltration) that overall soil water holding capacity. These results demonstrate that changes in soil organic carbon can have meaningful, large-scale effects on regional hydroclimate and should be considered in climate model evaluations and developments. Further, this also suggests that soil restoration efforts targeting the carbon cycle are likely to have additional benefits for improving drought resilience.
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在全球气候模式模拟中,土壤碳损失降低了土壤水分
大多数农业土壤都经历了大量的土壤有机碳损失。这些损失促使最近呼吁恢复农业用地的有机碳,以改善生物地球化学循环和减缓气候变化。有机碳的减少也降低了土壤入渗和持水能力,这可能对区域水文和气候产生重要影响。为了探索土壤有机碳变化对区域水文气候的影响,我们利用美国宇航局戈达德空间研究所的模型e进行了新的全球气候模型实验,其中包括与不同人类土地管理情景相关的空间显式土壤有机碳浓度。与“无土地利用”情况相比,2010年土壤退化情景中,农业土壤有机碳含量(OCC,重量%)平均减少约0.12倍,导致东亚、北欧和美国东部的土壤水分损失在0.5至1个时间标准差之间。在更极端的理想情况下,在农业土壤中OCC均匀减少0.66,土壤水分损失在两个半球超过一个标准差。在模型中,这些土壤水分的下降主要是由于孔隙度(以及较小程度的入渗)的减少,从而降低了土壤的总体持水量。这些结果表明,土壤有机碳的变化可以对区域水文气候产生有意义的大尺度影响,在气候模式评估和开发中应予以考虑。此外,这也表明以碳循环为目标的土壤恢复工作可能对提高抗旱能力有额外的好处。
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来源期刊
Earth Interactions
Earth Interactions 地学-地球科学综合
CiteScore
2.70
自引率
5.00%
发文量
16
审稿时长
>12 weeks
期刊介绍: Publishes research on the interactions among the atmosphere, hydrosphere, biosphere, cryosphere, and lithosphere, including, but not limited to, research on human impacts, such as land cover change, irrigation, dams/reservoirs, urbanization, pollution, and landslides. Earth Interactions is a joint publication of the American Meteorological Society, American Geophysical Union, and American Association of Geographers.
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