期刊
EARTH SURFACE PROCESSES AND LANDFORMS
卷 37, 期 2, 页码 193-208出版社
WILEY
DOI: 10.1002/esp.2246
关键词
soil erosion; soil carbon; modeling; soil conservation
资金
- German Research Foundation (DFG) [FI 1216/4-1]
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 -4.4gCm2 a1 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. Copyright (c) 2011 John Wiley & Sons, Ltd.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据