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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Model based analysis of lateral and vertical soil carbon fluxes induced by soil redistribution processes in a small agricultural catchment
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Model based analysis of lateral and vertical soil carbon fluxes induced by soil redistribution processes in a small agricultural catchment

机译：基于模型的小型农业流域土壤再分布过程引起的横向和纵向土壤碳通量分析

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摘要

Soil redistribution on arable land significantly affects lateral and vertical soil carbon (C) fluxes (caused by C formation and mineralization) and soil organic carbon (SOC) stocks. Whether this serves as a (C) sink or source to the atmosphere is a controversial issue. In this study, the SPEROS-C model was modified to analyse erosion induced lateral and vertical soil C fluxes and their effects upon SOC stocks in a small agricultural catchment (4·2ha). The model was applied for the period between 1950 and 2007 covering 30years of conventional tillage (1950-1979) followed by 28years of conservation tillage (1980-2007). In general, modelled and measured SOC stocks are in good agreement for three observed soil layers. The overall balance (1950-2007) of erosion induced lateral and vertical C fluxes results in a C loss of -4·4gCm ~(-2) a ~(-1) at our test site. Land management has a significant impact on the erosion induced C fluxes, leading to a predominance of lateral C export under conventional and of vertical C exchange between soil and atmosphere under conservation agriculture. Overall, the application of the soil conservation practices, with enhanced C inputs by cover crops and decreased erosion, significantly reduced the modelled erosion induced C loss of the test site. Increasing C inputs alone, without a reduction of erosion rates, did not result in a reduction of erosion induced C losses. Moreover, our results show that the potential erosion induced C loss is very sensitive to the representation of erosion rates (long-term steady state versus event driven). A first estimate suggests that C losses are very sensitive to magnitude and frequency of erosion events. If long-term averages are dominated by large magnitude events modelled erosion induced C losses in the catchment were significantly reduced.
机译：耕地上的土壤重新分布会显着影响横向和纵向土壤碳通量（由碳形成和矿化引起）和土壤有机碳（SOC）储量。这是作为（C）汇还是向大气汇入是一个有争议的问题。在本研究中，修改了SPEROS-C模型，以分析侵蚀引起的横向和纵向土壤碳通量及其对小型农业流域（4·2ha）中SOC储量的影响。该模型适用于1950年至2007年的30年常规耕种（1950-1979），然后是28年保护性耕种（1980-2007）。通常，对于三个观测到的土壤层，建模和测量的SOC存量非常吻合。侵蚀引起的横向和纵向C通量的总体平衡（1950-2007）导致我们测试点的C损失为-4·4gCm〜（-2）a〜（-1）。土地管理对侵蚀引起的碳通量具有重大影响，导致传统方式下侧向碳出口和保护性农业下土壤与大气之间的垂直碳交换占主导地位。总体而言，土壤保护措施的应用，增加了被覆作物的碳输入量并减少了侵蚀，从而大大减少了模型化的侵蚀引起的试验点碳损失。仅增加碳输入量，而不降低侵蚀率，并不能减少侵蚀引起的碳损失。此外，我们的结果表明，潜在的腐蚀诱导的C损失对腐蚀速率（长期稳态与事件驱动）的表示非常敏感。初步估计表明，碳损失对侵蚀事件的大小和频率非常敏感。如果长期平均值以大事件为主，则模拟的流失引起的流域碳损失将大大减少。

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