Carbon losses from all soils across England and Wales 1978-2003
Carbon losses from all soils across England and Wales 1978-2003
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DOI：
10.1038/nature04038
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发表时间：
2005-09-08
期刊：
影响因子：
64.8
通讯作者：
Kirk, GJD
中科院分区：
文献类型：
--
作者：
Bellamy, PH;Loveland, PJ;Kirk, GJD
土壤中的碳含量是植被或大气中碳含量的两倍多（1），土壤碳含量的变化会对全球碳收支产生很大影响。由于温度上升，土壤中二氧化碳排放量增加，从而加剧了气候变化的可能性，这是一个持续辩论的主题（2-9）。但迄今为止，所提出的反馈机制的证据仅来自小规模的实验室和实地实验以及建模研究（2-9）。在这里，我们使用的数据从英格兰和威尔士的国家土壤目录1978年和2003年之间获得的调查期间，碳从英格兰和威尔士各地的土壤中损失的平均速率为0.6%年（-1）（相对于现有的土壤碳含量）。结果表明，碳损失的相对速率随土壤碳含量的增加而增加，在碳含量大于100 g kg（-1）的土壤中，碳损失的相对速率大于2% yr（-1）。碳损失率和碳含量之间的关系与土地利用无关，这表明与气候变化有关。我们的研究结果表明，英格兰和威尔士的土壤碳损失--以及其他温带地区的推断--很可能抵消了陆地汇的碳吸收。
More than twice as much carbon is held in soils as in vegetation or the atmosphere(1), and changes in soil carbon content can have a large effect on the global carbon budget. The possibility that climate change is being reinforced by increased carbon dioxide emissions from soils owing to rising temperature is the subject of a continuing debate(2-9). But evidence for the suggested feedback mechanism has to date come solely from small-scale laboratory and field experiments and modelling studies(2-9). Here we use data from the National Soil Inventory of England and Wales obtained between 1978 and 2003 to show that carbon was lost from soils across England and Wales over the survey period at a mean rate of 0.6% yr(-1) ( relative to the existing soil carbon content). We find that the relative rate of carbon loss increased with soil carbon content and was more than 2% yr(-1) in soils with carbon contents greater than 100 g kg(-1). The relationship between rate of carbon loss and carbon content is irrespective of land use, suggesting a link to climate change. Our findings indicate that losses of soil carbon in England and Wales - and by inference in other temperate regions - are likely to have been offsetting absorption of carbon by terrestrial sinks.