Rapid carbon accretion and organic matter pool stabilization in riverine floodplain soils
Rapid carbon accretion and organic matter pool stabilization in riverine floodplain soils
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DOI：
10.1029/2009gb003481
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发表时间：
2009-12
影响因子：
5.2
通讯作者：
F. Zehetner;G. Lair;M. Gerzabek
中科院分区：
文献类型：
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作者：
F. Zehetner;G. Lair;M. Gerzabek
近年来，湿地在全球碳收支中的重要性已被认识到，河流洪泛平原的高生物量生产力已得到广泛承认。然而，这些生态系统中的土壤C动态仍然知之甚少，很少量化。在本研究中，我们量化了温暖温带气候下不同土地利用方式下河漫滩土壤有机碳的增加，并研究了有机质库在不同年龄梯度下的变化。我们发现，在土壤形成的最初100年里，碳积累速度很快，超过100 g m−2 a−1。研究表明，洪泛平原土地利用对土壤碳固存和有机质库分配有强烈影响，不同土壤有机质库的分布在土壤发育的几十年内达到稳定状态。我们的研究结果表明，河流洪泛平原上不断更新的土壤是强大的碳汇，但也表明集约耕作严重损害了它们的高碳固存潜力。
The importance of wetlands in the global C budget has been recognized in recent years, and the high biomass productivity of riverine floodplains is widely acknowledged. However, soil C dynamics in these ecosystems are still poorly understood and rarely quantified. In this study, we quantify organic C accretion and examine changes of organic matter pools across an age gradient of riverine floodplain soils under different land uses in a warm temperate climate. We find rapid C accumulation during the initial 100 years of soil formation, with rates exceeding 100 g m−2 a−1. We show that floodplain land use strongly affects soil C sequestration and organic matter pool allocation and find that the distribution of different soil organic matter pools reaches a steady state within a few decades of soil development. Our results demonstrate that continually rejuvenated soils on riverine floodplains are strong C sinks but also show that intensive cultivation severely compromises their high C sequestration potential.