A new approach to pedestal differentiation for soil loss estimation—a case study from a burnt area in north-central Portugal

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外文摘要：Soil pedestals have long been used as qualitative indicators of soil splash erosion.In rangelands,plant-capped pedestals,generally grass tussocks,have also been used to quantitatively estimate soil loss since the first half of the twentieth century.In agricultural lands,forests,and bad-lands,stone-capped pedestals have been used as qualitative and semi-quantitative indicators of active,'extreme'erosion.Little work has been reported on using capstone pedestal data for quantifying soil loss.We postulate that three distinct capstone pedestal types may be present in any given location and that a detailed analysis of a pedestal height histogram may be used to recognize their populations.This analysis can subsequently inform if soil loss can be reliably estimated and if so,which of the existing methods using pedestal height data will provide more accurate results.The three proposed capstone pedestal types are:(1)neo-pedestals formed under-neath surface stones exposed by(partial)removal of the soil surface cover;(2)endo-pedestals formed underneath stones that were buried in the soil but have been exposed by ero-sion;and(3)phoenix-pedestals formed underneath stones from collapsed pedestals.In the pedestal height histogram of any given location,a skew to smaller heights may indicate the existence of endo-and/or phoenix-pedestals,which may be revealed as a bi-(or tri)modal distribution when using a smaller bin size.This concept was applied to a case study where soil loss had been monitored for control plots and mulched plots during a 5-year period following wildfire in a eucalypt plantation.We measured pedestal heights and used methods to quantitatively assess soil loss from soil pedestal data in the available literature.Soil pedestal data at the end of the 5-year period under or overestimated soil loss in the control treatment,with results ranging from 60 to 115％of measured soil loss,depending on the method.It is postulated that phoenix-and endo-pedestals may be a driving factor behind the observed discrepancies.We discuss how future research may provide more insight into dominant processes,and how frequency distributions may be used to select the best methods for estimating soil loss from pedestals.

外文关键词：

Soil pedestalsMulchWildfireSoil erosionChar

作者：

Frank G.A.Verheijen、Martinho A.S.Martins、Sergio A.Prats、Jan J.Keizer

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作者单位：

Centre for Environmental and Marine Studies(CESAM),Department Environment and Planning,University of Aveiro,3810-193 Aveiro,Portugal

Mediterranean Institute for Agriculture,Environment and Development(MED-CHANGE),Institute for Advanced Studies and Research,University of Évora,Pólo da Mitra,Ap.94,7006-554 Évora,Portugal

GeoBiociências,Geotecnologias E Geoengenharias(GEOBIOTEC),Department Environment and Planning,University of Aveiro,3810-193 Aveiro,Portugal

基金：

CESAM by FCT/MCTESMED through national fundsFEDERFEDERprojects FIRECNUTSCASCADEEuropean UnionFCT CEEC funding of Frank G.A.VerheijenSergio A.Pratsnational funds(OE)SOILCOMBAT project through the Portuguese Foundation for Science and Technology(FCT/MCTES)Open access funding provided by FCT|FCCN(bon)

项目编号：

UIDP/50017/2020+UIDB/50017/2020+LA/P/0094/2020UIDB/05183/2020PT2020Compete 2020PTDC/AGRCFL/104559/2008ENV.2011.2.1.4-2/283068CEECIND/02509/2018CEECIND/01473/2020PTDC/EAM-AMB/0474/2020

出版年：

2024

DOI：

10.1007/s11676-023-01694-3

林业研究(英文版)

东北林业大学,中国生态学学会

林业研究(英文版)

CSTPCDEI

影响因子：0.365

ISSN：1007-662X

年,卷(期)：2024.35(3)