Spatial variability of soil organic carbon stock in an olive orchard at catchment scale in Southern Spain  

作　　者：Jose A.Gòmez Gema Guzmán Tom Vanwalleghem Karl Vanderlinden 

机构地区：[1]Institute for Sustainable Agriculture.Spanish National Research Council(IAS-CSIC),Alameda del Obispo S/N,14004,Cordoba,Spain [2]Department of Agronomy,University of Cordoba,Campus de Rabanales,14071,Cordoba,Spain [3]Centro IFAPA Alameda del Obispo,14004,Cordoba,Spain

出　　处：《International Soil and Water Conservation Research》2023年第2期311-326,共16页国际水土保持研究（英文）

基　　金：supported by projects AGL 2009-12936-C03-01,AGL2009-12936-C03-03(Spanish Government);SHui(European Commission Grant Agreement number:773903);TUdi(European Commission Grant Agreement number:101000224);EU-FEDER funds.T.Vanwalleghem thanks financial support from the Spanish Ministry of Science and Innovation,the Spanish State Research Agency,through the Severo Ochoa and Maria de Maeztu Program for Centers and Units of Excellence in R&D(Ref.CEX2019-000968-M).

摘　　要：Orchards have a high potential for carbon sequestration.However,little research is available on the spatial variability at catchment scale and on the difference between the tree area and the lanes.We analyzed theik spatial variability of soil organic carbon stock,SOCstock at 90 cm depth in an 8-ha catchment in Southern Spain with olives on a vertic soil.Results showed higher soil organic carbon concentration,SOC,in the tree area as compared to the lane up to 60 cm depth,but its impact on SOCstock was negligible since it was compensated by the higher soil bulk density in the lane.SOC at different depths was correlated with that in the top 0-5 cm.The overall SOCstock of the orchard was 4.14 kg m^(-2),ranging between 1.8 and 6.0 kg m^(-2).This SOCstock is in the mid-lower range of values reported for olive orchards,measured at smaller scale,and similar to those other intensive field crops and agroforestry under comparable rainfall conditions.The spatial variability in SOCstock was correlated to several geomorphological variables:elevation,cumulative upstream area,topographic wetness index,sediment transport index,and tillage erosion.Differences in SOC and SOCstock are driven by the sediment redis-tribution downslope,mainly by tillage erosion,and higher soil water availability in lower areas allowing higher biomass production.These topographic indexes and the correlation between SOC in the topsoil and SOCstock up to 90 cm should be further explored in other typology of olive orchards for facilitating the mapping of SOC_(stock).

关 键 词：Carbon sequestration Mediterraneancrops CATCHMENT Spatial variability Vertic soils 

分 类 号：S157[农业科学—土壤学]