Dynamic Replacement of Soil Inorganic Carbon under Water Erosion

Land Pub Date : 2024-07-14 DOI:10.3390/land13071053
Chen Zhang, Can Xu, Tianbao Huang, Liankai Zhang, Jinjiang Yang, Guiren Chen, Xiongwei Xu, Fuyan Zou, Zihao Liu, Zhenhui Wang
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Abstract

The dynamic replacement of soil organic carbon represents a pivotal mechanism through which water erosion modulates soil–atmosphere CO2 fluxes. However, the extent of this dynamic replacement of soil inorganic carbon within this process remains unclear. In our study, we focused on Yuanmou County, China, a prototypical region afflicted by water erosion, as our study area. We leveraged the WaTEM/SEDEM model to quantify the dynamic replacement of soil carbon, accounted for the average annual net change in soil carbon pools, and used isotope tracer techniques to track and measure the process of the coupled carbon–water cycling. This comprehensive approach enabled us to scrutinize the dynamic replacement of soil carbon under water erosion and delineate its ramifications for the carbon cycle. Our findings unveiled that the surface soil carbon reservoir in the Yuanmou area receives an annual replacement of 47,600 ± 12,600 tons following water erosion events. A substantial portion, amounting to 39,700 ± 10,500 tons, stems from the dynamic replacement of soil inorganic carbon facilitated by atmospheric carbon. These results underscore the critical role of the dynamic replacement of soil inorganic carbon in altering the soil–atmosphere CO2 fluxes under water erosion, thereby influencing the carbon cycle dynamics. Consequently, we advocate for the integration of water erosion processes into regional carbon sink assessments to attain a more comprehensive understanding of regional carbon dynamics.
水蚀作用下土壤无机碳的动态置换
土壤有机碳的动态置换是水侵蚀调节土壤-大气二氧化碳通量的关键机制。然而,在这一过程中,土壤无机碳的动态置换程度仍不清楚。在我们的研究中,我们以中国元谋县为研究区域,元谋县是一个典型的水土流失地区。我们利用 WaTEM/SEDEM 模型量化了土壤碳的动态置换,计算了土壤碳库的年均净变化,并使用同位素示踪技术跟踪和测量了碳-水循环耦合过程。这种综合方法使我们能够仔细研究水侵蚀作用下土壤碳的动态置换,并阐明其对碳循环的影响。我们的研究结果表明,元谋地区的地表土壤碳库在水蚀事件后的年替换量为 47,600 ± 12,600 吨。其中很大一部分(39700 ± 10500 吨)来自大气碳对土壤无机碳的动态置换。这些结果强调了土壤无机碳的动态置换在水侵蚀条件下改变土壤-大气二氧化碳通量,从而影响碳循环动态中的关键作用。因此,我们主张将水侵蚀过程纳入区域碳汇评估,以便更全面地了解区域碳动态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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