Effect of soil redistribution on various organic carbons in a water- and tillage-eroded soil
作者： X.J. Nie , J.H. Zhang , J.X. Cheng , H. Gao , Z.M. Guan
DOI: 10.1016/J.STILL.2015.07.003
关键词:
摘要: The information gap concerning the effect of soil redistribution on various carbon (C) pools will limit our understanding regarding fate eroded C. In this study, we selected a water- and tillage-eroded hillslope with horizontal length 45 m from Sichuan Basin, China, to determine impact particulate organic C 0.0053 2 mm particles (POC), light fraction (LFOC), dissolved (DOC) microbial biomass (MBC). Soil erosion was evaluated at 5-m intervals summit lower parts deposition bottom hillslope. Within erosional sites, tillage erosion- water erosion-dominated subsites were identified. POC content firstly decrease then increased downslope, while DOC exhibited an opposite pattern POC. MBC decreased LFOC increased. Overall, sites had contents than depositional demonstrating depletion induced by enrichment deposition. Conversely, greater in sites. It also observed that distribution strongly linked fine (<0.05 mm) particles, indicating preferentially transport downslope process erosion. addition, higher values POC/SOC DOC/SOC subsites, suggesting Likewise, MBC/SOC found thus implying more SOC may be assimilated into under Our study confirms need consider response dynamic replacement depleted SOC. 2015 Elsevier B.V. All rights reserved.
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