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

作　　者：Frank G.A.Verheijen Martinho A.S.Martins Sergio A.Prats Jan J.Keizer 

机构地区：[1]Centre for Environmental and Marine Studies(CESAM),Department Environment and Planning,University of Aveiro,3810-193 Aveiro,Portugal [2]Mediterranean Institute for Agriculture,Environment and Development(MED-CHANGE),Institute for Advanced Studies and Research,University of Evora,Polo da Mitra,Ap.94,7006-554 Evora,Portugal [3]GeoBiociencias,Geotecnologias E Geoengenharias(GEOBIOTEC),Department Environment and Planning,University of Aveiro,3810-193 Aveiro,Portugal

出　　处：《Journal of Forestry Research》2024年第3期45-54,共10页林业研究（英文版）

基　　金：supported by CESAM by FCT/MCTES (UIDP/50017/2020+UIDB/50017/2020+LA/P/0094/2020)and MED (UIDB/05183/2020)to FCT/MEC through national funds;the co-funding by the FEDER,within the PT2020 Partnership Agreement and Compete 2020,and projects FIRECNUTS (PTDC/AGRCFL/104559/2008);CASCADE (ENV.2011.2.1.4-2/283068),which is funded by the European Union;the FCT CEEC funding of Frank G.A.Verheijen (CEECIND/02509/2018),Sergio A.Prats (CEECIND/01473/2020),funded by national funds (OE);the SOILCOMBAT project (PTDC/EAM-AMB/0474/2020)through the Portuguese Foundation for Science and Technology (FCT/MCTES).

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 underneath 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 erosion;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

关 键 词：Soil pedestals MULCH WILDFIRE Soil erosion CHAR 

分 类 号：S714.7[农业科学—林学]