Aggregation but not organo-metal complexes contributed to C storage in tidal freshwater wetland soils

One of the many goals of wetland restoration is to promote the long-term storage of carbon (C) in the terrestrial biosphere. Unfortunately, soil C reservoirs in restored wetlands are slow to accumulate even after hydrology and plant communities are reestablished. Oftentimes wetland restoration changes the soil matrix and thus can dramatically alter how soil C is stored and processed. Our research investigated whether soil organic matter (SOM) preservation theories derived from studies in non-wetland soil systems can be extended to wetland soils. We examined C associated with water-stable soil aggregates, minerals, and metal oxides within habitats of one natural and one restored tidal freshwater wetland. This study revealed that a majority of the soil C in the natural site was associated with large macroaggregates (> 2000 μm), and soils from the restored site stored more C in small macroaggregates (> 250 to < 2000 μm). Despite these different associations, the chemical compositi...

湿地恢复的众多目标之一是促进碳（C）在陆地生物圈中的长期储存。遗憾的是，即使在水文条件和植物群落恢复后，恢复湿地中的土壤碳库积累速度依然缓慢。通常情况下，湿地恢复会改变土壤基质，从而显著改变土壤碳的储存和周转方式。本研究探讨了源自非湿地土壤系统研究的土壤有机质（SOM）保存理论是否可推广至湿地土壤。我们在一个自然潮汐淡水湿地和一个恢复潮汐淡水湿地的生境中，检测了与水稳性土壤团聚体、矿物及金属氧化物结合的碳。研究发现，自然湿地站点的大部分土壤碳与大团聚体（>2000 μm）结合，而恢复湿地站点的土壤碳更多储存在小团聚体（>250至<2000 μm）中。尽管存在这些不同的结合方式，但化学组成...