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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Carbon storage and soil organic matter stabilisation in near-natural, restored and embanked Swiss floodplains. (Special Issue: Properties, processes and ecological functions of floodplain, peatland, and paddy soils.)
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Carbon storage and soil organic matter stabilisation in near-natural, restored and embanked Swiss floodplains. (Special Issue: Properties, processes and ecological functions of floodplain, peatland, and paddy soils.)

机译：接近自然的，经过恢复和堤防的瑞士洪泛区的碳储存和土壤有机质稳定。 （特刊：洪泛区，泥炭地和水稻土的特性，过程和生态功能。）

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Over recent decades, the number of floodplain restoration projects has increased worldwide. In Switzerland, several projects have been implemented to maintain or recreate ecological functions of floodplains. Despite this, little is known about the potential of floodplain soils to release and/or accumulate carbon. In alluvial soils, carbon storage is strongly influenced by fluvial dynamics, and therefore a better understanding of carbon fluxes and stocks in such settings is clearly needed. To evaluate the impact of river restoration on carbon storage in alluvial soils, we aimed to quantify and explain carbon storage and soil organic matter (SOM) stabilisation in the uppermost soil humic layer. Three floodplains were investigated showing each of them different levels of human disturbance: a near-natural section along the Rhine River, and both restored and embanked sections along the Thur River and Emme River. Carbon storage was determined by total organic carbon (TOC) stocks. SOM stabilisation was evaluated by considering the TOC content in different granulometric fractions (1000-2000 micro m, 500-1000 micro m, and 250-500 micro m) and the macro-aggregate formation, i.e. the abundance of water-stable aggregates (WSA) and the mean weight diameter of macro-aggregates (MWD). Our results show that the carbon storage and SOM stabilisation parameters were all related to soil properties such as clay, silt and total iron contents of the upper humic layer. Within each floodplain, carbon storage and SOM stabilisation parameters differed according to soil profile groups, thus reflecting a soil gradient evolution from bare alluvium soils to more stabilised soils and a hydric functioning (soils with hydromorphic features). In addition, river restoration showed various impacts on carbon storage and SOM stabilisation parameters depending on the floodplains, with a significant difference between embanked and restored sections for the Emme floodplain and no difference for the Thur floodplain.
机译：在最近的几十年中，全世界的洪泛区修复项目数量有所增加。在瑞士，已实施了多个项目来维护或重建洪泛区的生态功能。尽管如此，对于洪泛区土壤释放和/或积碳的潜力知之甚少。在冲积土壤中，碳储量受河流动力学的强烈影响，因此显然需要更好地了解这种环境下的碳通量和储量。为了评估河流恢复对冲积土壤中碳存储的影响，我们旨在量化和解释最顶层土壤腐殖质层中的碳存储和土壤有机质（SOM）稳定性。对三个洪泛区进行了调查，结果显示它们各自受到不同程度的人为干扰：沿莱茵河的近自然段，以及沿瑟河和埃姆河的恢复段和堤岸段。碳存储量由总有机碳（TOC）库存确定。通过考虑不同粒度级分（1000-2000微米，500-1000微米和250-500微米）中的TOC含量和大的骨料形成（即水稳性骨料的丰度）来评估SOM稳定性）和大型聚合的平均重量直径（MWD）。我们的结果表明，碳储量和SOM稳定参数都与土壤特性有关，例如上层腐殖质层的粘土，淤泥和总铁含量。在每个洪泛区中，碳存储和SOM稳定参数根据土壤剖面类型而有所不同，因此反映了土壤梯度从裸露的冲积土向更稳定的土壤发展，并具有一定的液压功能（具有水溶形态特征的土壤）。此外，取决于洪泛区，河流恢复对碳存储和SOM稳定参数有各种影响，对于Emme洪泛区，堤岸和恢复段之间有显着差异，而对于Thur洪泛区，则没有差异。

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