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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Soil carbon losses by sheet erosion: a potentially critical contribution to the global carbon cycle
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Soil carbon losses by sheet erosion: a potentially critical contribution to the global carbon cycle

机译：片层侵蚀造成的土壤碳损失：对全球碳循环的潜在关键贡献

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摘要

Despite soil erosion through water being a ubiquitous process and its environmental consequences being well understood, its effects upon the global carbon cycle still remain largely uncertain. How much soil organic carbon (SOC) is removed each year from soils by sheet wash, an important if not the most efficient mechanism of detachment and transport of surficial soil material? What are the main environnemental controls worldwide? These are important questions which largely remain unanswered. Empirical data from 240 runoff plots studied over entire rainy seasons from different regions of the world were analysed to estimate particulate organic carbon (POC) losses (POCL), and POC enrichment in the sediments compared to the bulk soil (ER), which can be used as a proxy of the fate of the eroded POC. The median POCL was 9.9 g C m(-2) y(-1) with highest values observed for semi-arid soils (POCL=10.8 g C m(-2) y(-1)), followed by tropical soils (POCL=6.4 g C m(-2) y(-1)) and temperate soils (POCL=1.7 g C m(-2) y(-1)). Considering the mean POCL of 27.2 g C m(-2) y(-1), the total amount of SOC displaced annually by sheet erosion from its source would be 1.32 +/- 0.20 Gt C, i.e.14.6% of the net annual fossil fuel induced C emissions of 9 Gt C. Because of low sediment enrichment in POC, erosion-induced CO2 emissions are likely to be limited in clayey environments while POC burial within hillslopes is likely to constitute an important carbon sink. In contrast, most of the POC displaced from sandy soils is likely to be emitted to the atmosphere. These results underpin the major role sheet wash plays in the displacement of SOC from its source and in the fate of the eroded SOC, with large variations across the different pedo-climatic regions of the world. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：尽管水对土壤的侵蚀是一个普遍存在的过程，其环境后果众所周知，但其对全球碳循环的影响仍然很大程度上不确定。每年通过表层清洗从土壤中去除多少土壤有机碳（SOC），如果不是最有效的分离和运输表层土壤物质的机制，那么这很重要吗？全世界主要的环境控制是什么？这些是重要的问题，至今仍未解决。分析了来自世界不同地区的整个雨季研究的240个径流地块的经验数据，以估计颗粒状有机碳（POC）的损失（POCL）和沉积物中POC的富集，与散装土壤（ER）相比，可以用作侵蚀的POC命运的代理。 POCL中位数为9.9 g C m（-2）y（-1），半干旱土壤（POCL = 10.8 g C m（-2）y（-1））最高，其次是热带土壤（POCL = 6.4 g C m（-2）y（-1））和温带土壤（POCL = 1.7 g C m（-2）y（-1））。考虑到平均POCL为27.2 g C m（-2）y（-1），由片源每年由片状侵蚀置换的SOC总量为1.32 +/- 0.20 Gt C，即净化石的14.6％燃料引起的碳排放量为9 GtC。由于POC中沉积物的富集程度低，在黏土环境中侵蚀引起的CO2排放可能受到限制，而坡地中的POC埋藏则可能构成重要的碳汇。相反，大多数从沙质土壤中移出的POC可能会排放到大气中。这些结果支持了纸页冲洗在SOC的源头置换和SOC侵蚀的命运中所起的主要作用，并且在世界不同的气候环境地区都有很大的差异。版权所有（c）2015 John Wiley＆Sons，Ltd.

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